WO2022050907A1 - Connection system between hollow structural steel columns and post-tensioned concrete slabs - Google Patents

Connection system between hollow structural steel columns and post-tensioned concrete slabs Download PDF

Info

Publication number
WO2022050907A1
WO2022050907A1 PCT/TH2021/000047 TH2021000047W WO2022050907A1 WO 2022050907 A1 WO2022050907 A1 WO 2022050907A1 TH 2021000047 W TH2021000047 W TH 2021000047W WO 2022050907 A1 WO2022050907 A1 WO 2022050907A1
Authority
WO
WIPO (PCT)
Prior art keywords
post
connection
hollow structural
structural steel
tensioned
Prior art date
Application number
PCT/TH2021/000047
Other languages
French (fr)
Inventor
Nuttapon SUTTITAM
Wisan TONGSRIPANICH
Pawit SORTHANANUSAK
Pradya EIAMSONGSAK
Thanabodin SORNSADANG
Original Assignee
Sahaviriya Steel Industries Public Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sahaviriya Steel Industries Public Co., Ltd. filed Critical Sahaviriya Steel Industries Public Co., Ltd.
Priority to AU2021337480A priority Critical patent/AU2021337480A1/en
Publication of WO2022050907A1 publication Critical patent/WO2022050907A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/02—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements
    • E04B1/04—Structures consisting primarily of load-supporting, block-shaped, or slab-shaped elements the elements consisting of concrete, e.g. reinforced concrete, or other stone-like material
    • E04B1/043—Connections specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/046—Post treatment to obtain pre-stressed articles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/044—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of concrete
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/06—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres reinforced
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • E04C3/32—Columns; Pillars; Struts of metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/012—Discrete reinforcing elements, e.g. fibres
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/166—Connectors or means for connecting parts for reinforcements the reinforcements running in different directions
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
    • E04B1/165—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material with elongated load-supporting parts, cast in situ
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/30—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts being composed of two or more materials; Composite steel and concrete constructions
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/58—Connections for building structures in general of bar-shaped building elements
    • E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
    • E04B1/5831—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially rectangular form
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2406—Connection nodes
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2415—Brackets, gussets, joining plates
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2418—Details of bolting
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2445—Load-supporting elements with reinforcement at the connection point other than the connector
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2451—Connections between closed section profiles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/246—Post to post connections
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B2001/2484—Details of floor panels or slabs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
    • E04B2001/4192—Connecting devices specially adapted for embedding in concrete or masonry attached to concrete reinforcing elements, e.g. rods or wires

Definitions

  • This invention specifically relates to hollow structural steel gravity columns and their connection system between hollow structural steel columns and post-tensioned concrete slabs.
  • Post-tensioned concrete slab is a combination of conventional reinforced concrete slab and additional high-strength PC strands (pre-stressed concrete steel strand), which are consequently subjected to tension after the concrete has set.
  • Post-tensioned concrete slab is extensively used in infrastructure and building construction due to a number of advantages, including the ease of management and construction. Due to the application of high-strength steel tendons and post-tensioned process, thinner slab with long span structure can be achieved, resulting in longer column-free spaces and light weight structure.
  • Post-tensioned concrete slab is considered as a popular concrete slab system in various countries. This is because the posttensioned concrete slab is lighter in weight as a result of thinner slab thickness than the weight of conventional cast-in-place concrete slab.
  • PC strands pre-stressed concrete steel strand
  • Hollow structural steel columns with the same load-carrying capacity comparing to conventional concrete columns require a smaller cross-sectional area, resulting in more spacious floor space allowing more flexibility in interior design.
  • the installation of the steel columns can be done much quicker due to modular system characteristics.
  • the types of steel columns commonly used in building construction are H-beam structural steel columns, Hollow Steel Section (HSS) columns, etc.
  • HSS Hollow Steel Section
  • the use of post-tensioned concrete slabs with hollow structural steel columns will greatly contribute more values to building construction projects.
  • post-tensioned concrete slabs and steel columns have not been integratedly designed together due to the complexity of connection systems between them and the limitations of engineering knowledge regarding structural behaviors of the integrated composite system.
  • An object of the present invention is to address the solution in response to the aforementioned problems by designing a connection system between hollow structural steel columns and post-tensioned concrete slabs at the top and base of the hollow structural steel columns, describing as a male connection and female connection respectively.
  • the male connection is designed to provide punching shear resistance for post-tensioned concrete slab at the connecting area around the top of columns.
  • the main function of female connection is to provide the continuity and integrity for post-tensioned concrete slabs at the connected area.
  • this can be simply achieved by placing female connection on top of male connection of the lower column and tightening them with bolts or threaded shear studs with nuts which have been pre-installed on the male connection. Threaded shear studs or bolts are installed with leveling nuts to allow constructors to be able to adjust column elevation and plumpness of the upper column as desired.
  • the male connection consists of a steel cap plate welded to the top of the lower column, a group of guide plates, and a set of threaded shear studs or bolts and leveling nuts.
  • the guide plates will be installed on the cap plate where the upper column is centered and used as a guide to locate the center of the upper columns during the erection process.
  • the female connection comprises the triangular brackets, which are welded to the sides of the hollow structural steel column.
  • An open end of the upper hollow structural steel column is to be placed where the guide plates of the male connection welded to the top of the upper lower column cap plate are located.
  • Openings with additional steel reinforcement on the sides of the upper column base are provided as a passway of the concrete slab reinforcement to provide the continuity of the post-tensioned concrete slab at the area around the connection.
  • connection system The main function of this invented connection system is to provide an integrated connection system between upper and lower hollow structural steel columns, while supporting post-tensioned concrete slabs. Furthermore, there is no limitation with respect to the different sizes of upper and lower columns due to the advantages of exploiting pre-fabrication process, which will facilitate the ease of installation and its accuracy.
  • Figure 1 Overall components of connection system.
  • Figure 2 The location of male connection and female connection on a hollow structural steel column.
  • Figure 3 Components of male connection (top view).
  • Figure 4 Components of male connection (bottom view).
  • Figure 5 Components of female connection (top view).
  • Figure 6 Components of female connection (bottom view).
  • Figure 8 Cross section of completed connection system.
  • FIG. 9 Side view of completed connection system within post-tensioned concrete slab. Description of the Preferred Embodiments
  • connection system between hollow structural steel columns and post-tensioned concrete slabs comprises a male connection (4), which is a square or rectangular steel plate, placed at the top of the lower column, and a female connection (5) comprising triangular brackets (12) welded at the base of the upper column sidewalls.
  • the male and female connections will then be bolted to connect the upper column (1) and the lower column (2) together.
  • the complete connection system provides a connection between the upper and lower hollow structural steel columns while supporting posttensioned concrete slabs (3) at the same time ( Figure 1).
  • Figure 2 illustrates that the male connection (4) is located at the top of the lower column, and the female connection (5) is located at the base of the upper column.
  • Figures 3 and 4 illustrate the component of male connection, which consists of a steel cap plate (6) welded at the top of the lower column (4).
  • the cap plate is wider than the width of steel columns and is mainly responsible for carrying the post-tensioned concrete slab carrying designed dead load and floor live load.
  • At the top center of the cap plate (6) there is a group of guide plates (10) made of steel plates welded on top of cap plates. These guide plates will be for the installation of the upper hollow structural steel columns (1).
  • the width of the guide plates is designed to properly insert the open end (15) of the upper column.
  • the height of the guide plates (10) is lower than a diaphragm plate (11), which is attached to the inner wall of the upper column.
  • FIGs 5 and 6 illustrate the components of female connection consisting of triangular brackets (12) welded to the sides of a hollow structural steel column (1), one on each side. It is used in conjunction with a set of threaded shear studs, leveling nuts (7) and tightening nuts (19) of the male connection to serve the purposes previously mentioned.
  • the open end (15) of the upper hollow structural steel column, underneath the female connection, will be mounted over the group of guide plates (10) welded on the cap plate during the installation process.
  • a diaphragm plate (11) is attached to inner walls of the upper steel columns. The diaphragm plate is to strengthen and stiffen hollow structural steel column wall due to the compression force transferred from triangular brackets (12).
  • openings with required reinforcement (13) are prepared in the directions of steel reinforcement of the post-tensioned concrete slab.
  • the openings are to facilitate the installation of steel slab reinforcement (17) (18) by inserting steel reinforcement through the openings in both direction (x and y), as shown in Figure 7 and Figure 8.
  • These steel reinforcements will be spliced to the steel reinforcements of the post-tensioned concrete slab in order to strengthen the connection and to prevent concrete cracks at the interface of concrete slab and steel column enhancing the continuity of the post-tension concrete slab.
  • the triangular bracket (12) is made of two triangular reinforcing steel plates and one rectangular steel plate, assembled together by welding. The triangular brackets are welded onto the outer walls of the steel column (5) at the female connection. At the center of each support plate, a drilled hole (14) was prepared and used for inserting a set of threaded shear stud and leveling nut (7) at the male connection side (9).
  • the main functions of triangular bracket (12) can be divided according to each phase of the construction as follows.
  • the triangular bracket (12) will perform in conjunction with a set of threaded shear studs or bolts and leveling nuts (7) to connect the lower column with the upper column and to facilitate field adjustment, i.e. elevation and plumbness of the upper column. Then the securement of the upper column to the lower column can be performed by tightening nuts (19) onto the threaded shear studs or bolts (8).
  • the triangular brackets (12) will perform in conjunction with the threaded shear studs or bolts (8), and nuts (19) to help carry some loads transferred to cap plate (6) from the concrete slab (3).
  • the thickness of the post-tensioned concrete slab (3) will be at least the distance from the bottom surface of the cap plate (6) of the male connection to the top of the triangular brackets ( Figure 9).
  • connection system between hollow structural steel column and posttensioned concrete slab can be written in sequence as follows. Assemble the upper and lower hollow structural steel columns together by placing the upper column on top of the cap plate of the lower column. The open end (15) of the female connection (5) of the upper column will be placed over a group of guide plates (10) and welded on the male connection (4) of the lower column with the installation of shim plates as required. The threaded shear studs or bolts (8) will be inserted through the holes at the horizontal rectangular plate of the triangular bracket (14) on top of the leveling nuts (9) ( Figure 7 and 8). Adjust the elevation and plumbness of the upper column as desired by wrenching the leveling nuts (9).

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The connection system between hollow structural steel columns and post-tensioned concrete slabs is a state-of-the-art innovation for the multi-story building construction with post- tensioned or reinforced concrete flat slab. This connection system enables the adjustability for the constructors to manually adjust the elevation and plumbness of upper column leading to high construction quality. The connection system can be divided into two main parts: the male connection at the top of the lower column and the female connection at the base of the upper column. The male connection was designed to support post-tensioned concrete slab and enhance the punching shear resistance of post-tensioned concrete slab. The female connection primarily provides continuity to post-tensioned concrete slabs and also increase punching shear capacity for the male connection. These two main parts will then be connected together by tightening the fixing nuts along with inserting the additional steel reinforcements through the openings in both directions (x and y). Eventually, the completed connection system will perform integrally connecting the upper and lower hollow structural steel columns, as well as providing the continuity for post- tensioned concrete slabs.

Description

CONNECTION SYSTEM BETWEEN HOLLOW STRUCTURAL STEEL COLUMNS AND POST-TENSIONED CONCRETE SLABS.
Technical Field
This invention specifically relates to hollow structural steel gravity columns and their connection system between hollow structural steel columns and post-tensioned concrete slabs.
Background Art
Post-tensioned concrete slab is a combination of conventional reinforced concrete slab and additional high-strength PC strands (pre-stressed concrete steel strand), which are consequently subjected to tension after the concrete has set. Post-tensioned concrete slab is extensively used in infrastructure and building construction due to a number of advantages, including the ease of management and construction. Due to the application of high-strength steel tendons and post-tensioned process, thinner slab with long span structure can be achieved, resulting in longer column-free spaces and light weight structure. Post-tensioned concrete slab is considered as a popular concrete slab system in various countries. This is because the posttensioned concrete slab is lighter in weight as a result of thinner slab thickness than the weight of conventional cast-in-place concrete slab. It also provides wider spans for certain types of buildings, such as parking buildings, residential buildings or hotels, as the post-tensioned concrete slabs do not need beams or girders in order to carry the floor load which would be conversely carried by PC strands (pre-stressed concrete steel strand). These PC strands are installed evenly along the columns line in both x and y axes, during the process of reinforcement installation before the concrete pouring sequence. After pouring concrete and the concrete has already hardened, PC strands are then stressed to strengthen and increase the load-carrying capacity of post-tensioned concrete slabs.
Hollow structural steel columns with the same load-carrying capacity comparing to conventional concrete columns require a smaller cross-sectional area, resulting in more spacious floor space allowing more flexibility in interior design. In addition, the installation of the steel columns can be done much quicker due to modular system characteristics. The types of steel columns commonly used in building construction are H-beam structural steel columns, Hollow Steel Section (HSS) columns, etc. The use of post-tensioned concrete slabs with hollow structural steel columns will greatly contribute more values to building construction projects. However, post-tensioned concrete slabs and steel columns have not been integratedly designed together due to the complexity of connection systems between them and the limitations of engineering knowledge regarding structural behaviors of the integrated composite system. These complexity and limitations are the concerns need to be further studied in detail, which can be stated as follows.
1. Prevention of punching shear of the post-tensioned concrete slab due to smaller size of hollow structural steel column (comparing to RC column) and the inhomogeneity between hollow structural steel columns and post-tensioned concrete slabs
2. Connection details between lower columns and upper columns so that the structural integrity of these columns can be achieved
3. Concrete slab reinforcement details to ensure the continuity of the post-tensioned concrete slab at the connecting area in order to maintain the performance of the post-tensioned slab
Objects of the Invention
An object of the present invention is to address the solution in response to the aforementioned problems by designing a connection system between hollow structural steel columns and post-tensioned concrete slabs at the top and base of the hollow structural steel columns, describing as a male connection and female connection respectively. The male connection is designed to provide punching shear resistance for post-tensioned concrete slab at the connecting area around the top of columns. On the other hand, the main function of female connection is to provide the continuity and integrity for post-tensioned concrete slabs at the connected area. To connect female connection and male connection together, this can be simply achieved by placing female connection on top of male connection of the lower column and tightening them with bolts or threaded shear studs with nuts which have been pre-installed on the male connection. Threaded shear studs or bolts are installed with leveling nuts to allow constructors to be able to adjust column elevation and plumpness of the upper column as desired.
The male connection consists of a steel cap plate welded to the top of the lower column, a group of guide plates, and a set of threaded shear studs or bolts and leveling nuts. The guide plates will be installed on the cap plate where the upper column is centered and used as a guide to locate the center of the upper columns during the erection process.
The female connection comprises the triangular brackets, which are welded to the sides of the hollow structural steel column. An open end of the upper hollow structural steel column is to be placed where the guide plates of the male connection welded to the top of the upper lower column cap plate are located. Openings with additional steel reinforcement on the sides of the upper column base are provided as a passway of the concrete slab reinforcement to provide the continuity of the post-tensioned concrete slab at the area around the connection.
The main function of this invented connection system is to provide an integrated connection system between upper and lower hollow structural steel columns, while supporting post-tensioned concrete slabs. Furthermore, there is no limitation with respect to the different sizes of upper and lower columns due to the advantages of exploiting pre-fabrication process, which will facilitate the ease of installation and its accuracy.
Brief Description of the Drawings
Figure 1 Overall components of connection system.
Figure 2 The location of male connection and female connection on a hollow structural steel column.
Figure 3 Components of male connection (top view).
Figure 4 Components of male connection (bottom view).
Figure 5 Components of female connection (top view).
Figure 6 Components of female connection (bottom view).
Figure 7 Complete connection system.
Figure 8 Cross section of completed connection system.
Figure 9 Side view of completed connection system within post-tensioned concrete slab. Description of the Preferred Embodiments
The connection system between hollow structural steel columns and post-tensioned concrete slabs according to a preferred embodiment of the present invention comprises a male connection (4), which is a square or rectangular steel plate, placed at the top of the lower column, and a female connection (5) comprising triangular brackets (12) welded at the base of the upper column sidewalls. The male and female connections will then be bolted to connect the upper column (1) and the lower column (2) together. The complete connection system provides a connection between the upper and lower hollow structural steel columns while supporting posttensioned concrete slabs (3) at the same time (Figure 1).
Figure 2 illustrates that the male connection (4) is located at the top of the lower column, and the female connection (5) is located at the base of the upper column.
Figures 3 and 4 illustrate the component of male connection, which consists of a steel cap plate (6) welded at the top of the lower column (4). The cap plate is wider than the width of steel columns and is mainly responsible for carrying the post-tensioned concrete slab carrying designed dead load and floor live load. At the top center of the cap plate (6), there is a group of guide plates (10) made of steel plates welded on top of cap plates. These guide plates will be for the installation of the upper hollow structural steel columns (1). The width of the guide plates is designed to properly insert the open end (15) of the upper column. The height of the guide plates (10) is lower than a diaphragm plate (11), which is attached to the inner wall of the upper column. At the top of the cap plate (6), there is also a group of threaded shear studs or bolts with leveling nuts (7) located around all sides of the group of guide plates (10), one set on each side. A set of threaded shear studs or bolts and leveling nuts (7) will be used to connect the triangular brackets (12), which are parts of the female connection for the following purposes:
1. Stabilizing upper columns during the construction period
2. Adjusting elevation and plumbness of upper columns
3. Assembling both the upper and lower columns
4. Improving the load carrying capacity of the cap plate
Figures 5 and 6 illustrate the components of female connection consisting of triangular brackets (12) welded to the sides of a hollow structural steel column (1), one on each side. It is used in conjunction with a set of threaded shear studs, leveling nuts (7) and tightening nuts (19) of the male connection to serve the purposes previously mentioned. The open end (15) of the upper hollow structural steel column, underneath the female connection, will be mounted over the group of guide plates (10) welded on the cap plate during the installation process. Inside the opening (15), a diaphragm plate (11) is attached to inner walls of the upper steel columns. The diaphragm plate is to strengthen and stiffen hollow structural steel column wall due to the compression force transferred from triangular brackets (12). There is a circular hole (16) at the center of the diaphragm plate (11), which is to facilitate the concrete fill during the concrete slab pouring. At the base of the female connection (5), openings with required reinforcement (13) are prepared in the directions of steel reinforcement of the post-tensioned concrete slab. The openings are to facilitate the installation of steel slab reinforcement (17) (18) by inserting steel reinforcement through the openings in both direction (x and y), as shown in Figure 7 and Figure 8. These steel reinforcements will be spliced to the steel reinforcements of the post-tensioned concrete slab in order to strengthen the connection and to prevent concrete cracks at the interface of concrete slab and steel column enhancing the continuity of the post-tension concrete slab.
The triangular bracket (12) is made of two triangular reinforcing steel plates and one rectangular steel plate, assembled together by welding. The triangular brackets are welded onto the outer walls of the steel column (5) at the female connection. At the center of each support plate, a drilled hole (14) was prepared and used for inserting a set of threaded shear stud and leveling nut (7) at the male connection side (9). The main functions of triangular bracket (12) can be divided according to each phase of the construction as follows.
1. During the construction period, the triangular bracket (12) will perform in conjunction with a set of threaded shear studs or bolts and leveling nuts (7) to connect the lower column with the upper column and to facilitate field adjustment, i.e. elevation and plumbness of the upper column. Then the securement of the upper column to the lower column can be performed by tightening nuts (19) onto the threaded shear studs or bolts (8).
2. After the stage of concrete pouring, the triangular brackets (12) will perform in conjunction with the threaded shear studs or bolts (8), and nuts (19) to help carry some loads transferred to cap plate (6) from the concrete slab (3). The thickness of the post-tensioned concrete slab (3) will be at least the distance from the bottom surface of the cap plate (6) of the male connection to the top of the triangular brackets (Figure 9).
The installation of a connection system between hollow structural steel column and posttensioned concrete slab can be written in sequence as follows. Assemble the upper and lower hollow structural steel columns together by placing the upper column on top of the cap plate of the lower column. The open end (15) of the female connection (5) of the upper column will be placed over a group of guide plates (10) and welded on the male connection (4) of the lower column with the installation of shim plates as required. The threaded shear studs or bolts (8) will be inserted through the holes at the horizontal rectangular plate of the triangular bracket (14) on top of the leveling nuts (9) (Figure 7 and 8). Adjust the elevation and plumbness of the upper column as desired by wrenching the leveling nuts (9). Tighten the upper column to the lower column by tightening the fixing nuts (19) into the threaded shear studs or bolts (8) protruding from the drilled hole (14) of the triangular bracket (12). Install the additional steel reinforcement (17) and (18) by inserting through the opening (13) prepared on each side of the female connection (5) in both directions. Afterwards the additional steel reinforcement and slab reinforcement will be spliced together to ensure the continuity of the post-tensioned concrete slabs at the connecting point. This will secure the overall integrity, and prevent the initiation of concrete crack at the interface of concrete slab and steel column face.

Claims

7 Claim What is claimed is:
1. A connection system between hollow structural steel columns and post-tensioned concrete slabs said member having a unitary body and comprising:
A male connection at the top of a lower hollow structural steel column and a female connection at the base of an upper hollow structural steel column.
A male connection consists of a steel cap plate at the top of a lower hollow structural steel column. a group of guide plates at the upper center area of the steel cap plate.
A set of threaded shear studs or bolts and leveling nuts located around all sides of a group of guide plates, 1 set on each side.
A female connection consists of triangular brackets connected to each side of a hollow structural steel column. a diaphragm plate inside the open end welded to the inner wall of an upper steel column. four openings with reinforcements as required above the triangular brackets, one on each side. additional steel reinforcements as required through the openings above the triangular brackets.
PCT/TH2021/000047 2020-09-03 2021-08-20 Connection system between hollow structural steel columns and post-tensioned concrete slabs WO2022050907A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2021337480A AU2021337480A1 (en) 2020-09-03 2021-08-20 Connection system between hollow structural steel columns and post-tensioned concrete slabs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TH2001005013 2020-09-03
TH2001005013 2020-09-03

Publications (1)

Publication Number Publication Date
WO2022050907A1 true WO2022050907A1 (en) 2022-03-10

Family

ID=80491900

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/TH2021/000047 WO2022050907A1 (en) 2020-09-03 2021-08-20 Connection system between hollow structural steel columns and post-tensioned concrete slabs

Country Status (2)

Country Link
AU (1) AU2021337480A1 (en)
WO (1) WO2022050907A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102605858A (en) * 2012-04-01 2012-07-25 杨东佐 Building structure and construction method
US20120304584A1 (en) * 2011-05-30 2012-12-06 National Taiwan University Of Science And Technology Architectured reinforcement structure
WO2015152537A1 (en) * 2014-04-03 2015-10-08 김홍남 Composite insert device for placement in concrete

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120304584A1 (en) * 2011-05-30 2012-12-06 National Taiwan University Of Science And Technology Architectured reinforcement structure
CN102605858A (en) * 2012-04-01 2012-07-25 杨东佐 Building structure and construction method
WO2015152537A1 (en) * 2014-04-03 2015-10-08 김홍남 Composite insert device for placement in concrete

Also Published As

Publication number Publication date
AU2021337480A1 (en) 2023-04-06

Similar Documents

Publication Publication Date Title
US9518401B2 (en) Open web composite shear connector construction
US9523188B2 (en) Framing structure
US4646495A (en) Composite load-bearing system for modular buildings
US20110107711A1 (en) Connector system for securing an end portion of a steel structural member to a vertical cast concrete member
US20110107716A1 (en) Connector system for securing an end portion of a steel structural member to a vertical cast concrete member
WO2008133460A1 (en) Composite concrete column and construction method using the same
KR19990028448A (en) Building unit, unit building and construction method
KR20210131540A (en) End Reinforced half preecast concrete beam and construction method of the same
US4607470A (en) Pre-stressed construction element
CN113062476B (en) Heavy-load large-span combined beam-column structure and construction method
KR102120884B1 (en) The construction method of structure using RC wall and composite beam
US20220018112A1 (en) Modular building systems
WO2022050907A1 (en) Connection system between hollow structural steel columns and post-tensioned concrete slabs
KR101257752B1 (en) Non-welding type seismic reinforcing structure and method for column using cft
KR20210077874A (en) method of uniting the longitudinal steel on the lower flange of steel box girder bridge with tension introduced
KR101398435B1 (en) Constructing method of complex girder and the structure thereby
CN109695315A (en) A kind of assembled steel tube bank prestressed concrete combination beam and its construction method
JP2754377B2 (en) Building structure
KR102372473B1 (en) Constuction Structure for Joint of PC-Colunm and PC-Girder Using Temporay Bracket
KR102347637B1 (en) Partial precast concrete couple girder and the joint structure between it and pillar
JPH06248700A (en) Architectural structure
KR20180070097A (en) Prestressed Hybrid Wide Flange Girder System Suitable For Resisting Negative Moments At Construction Stage
CN106996151B (en) Mounting structure suitable for fixing external hanging type wallboard
WO2013093600A2 (en) Prefabricated concrete structure for dry-assembled civil buildings
GB2108548A (en) Structural joint

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21864824

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2021337480

Country of ref document: AU

Date of ref document: 20210820

Kind code of ref document: A

122 Ep: pct application non-entry in european phase

Ref document number: 21864824

Country of ref document: EP

Kind code of ref document: A1