WO2021103576A1 - Method for determining connecting mode and connecting joint of frame beam and integrated house framework beam - Google Patents

Abstract

The present application provides a method for determining a connecting mode and a connecting joint of a frame beam and an integrated house framework beam. The connecting mode comprises the frame beam, the framework beam, an insertion connection assembly and matching bolts. The insertion connection assembly comprises U-shaped steel plate elements and L-shaped steel plate elements matched in pairs. The integrated house framework beam and the frame beam are connected using high-strength bolts. The distance between the bolts is obtained by means of numerical analysis, and the size of the insertion connection assembly is determined by means of analysis of an ABAQUS finite element model. The connecting joint of the present application is simple in structure and uniform in modulus; precise positioning can be performed on an integrated house and the frame beam by means of the insertion connection assembly; only bolt connection is needed during field assembly, and construction is easy.

Description

The connection mode of the frame beam and the frame beam of the integrated house and the determination method of the connection node

This application requires that it be submitted to the Chinese Patent Office on November 29, 2019, the application number is CN201911199953.4, and the application name is "a method of connecting a frame beam and an integrated building frame beam and a method for determining the connection node". The priority of the Chinese patent application Right, the entire contents of which are incorporated in this application by reference.

Technical field

The application belongs to the field of civil engineering, and specifically relates to a connection mode of a frame beam and a frame beam of an integrated house and a method for determining connection nodes.

Background technique

Integrated house is a kind of building product that adopts modular design, factory production, movable and reusable. It is mostly used in temporary offices, dormitories, field exploration, and construction houses for field operations on construction sites. At this stage, integrated houses The connection between them is mainly in the form of welding, which is difficult to weld on site, and the quality is uncontrollable, and the seismic performance of the welded connection is far inferior to that of the bolted connection. In order to ensure the safety of the structure, the existing integrated houses mostly use solid section steel as the skeleton column, skeleton beam, self-weight, high cost, inconvenient transportation and other reasons, so that the integrated houses are mostly used in low-rise buildings. The steel frame structure has the advantages of flexible layout, simple structure, easy construction, and good seismic performance. The reliable connection of the integrated house and the steel frame structure can greatly increase the construction speed of the building, shorten the construction period, and reduce the application of the steel frame structure. The amount of steel used in the frame beams of the integrated house reduces the self-weight of the integrated house, which enables the integrated house to be used in multi-story buildings.

In order to ensure its own bearing capacity, integrated houses need to use solid steel beams and columns, which are self-heavy, high in cost, and limited in building height. Although the steel frame structure has good bearing capacity, it cannot have direct use functions. At present, the connection method of integrated house and steel frame structure is mostly welding, and the existing patents have less research on the connection node of steel frame beam and integrated house skeleton beam. Most of the patents are only for the connection of integrated house frame and integrated house frame. Research on the structural optimization and material selection of the house itself or the optimization and research on the beam-column connection nodes of the fully assembled steel frame system. The patent 201720022079.7 discloses a box-body fusion frame. The patent only describes that adjacent integrated houses are connected by auxiliary supporting steel beams, rather than the connection form of the integrated house and the frame beam; the patent 201820379360.0 discloses a roof of an integrated house Frame beams, this patent only describes the connection form of roof frame beams, and introduces beams suitable for integrated houses; patent 201711390228.6 discloses a fully assembled steel frame structure system with recovery function, and proposes that it can be replaced after an earthquake Steel frame system.

Summary of the invention

The purpose of this application is to address the shortcomings of the prior art, provide a simple structure, reliable connection, high degree of assembly, easy construction of the frame beam and integrated house frame beam connection method, and provide the frame beam and the frame beam connection node The method of determining.

The technical solution of the present application: a connection mode of a frame beam and an integrated house skeleton beam and a method for determining connection nodes. The connection of the frame beam and the integrated house skeleton beam includes a frame beam, a skeleton beam, a plug-in component and matching bolts. The plug-in assembly includes a pair of U-shaped steel plate parts and L-shaped steel plate parts, and the two steel plate parts are snap-connected. The U-shaped steel plate parts are welded to the outside of the upper frame beam of the integrated house, and the L-shaped steel plate parts are welded to The lower flange of the frame beam connected with the upper frame beam of the integrated house, the lower flange of the lower frame beam of the integrated house and the upper flange of the connected frame beam are pre-opened with bolt holes and connected by high-strength bolts.

The method for determining the connection node between the frame beam and the frame beam of the integrated house includes the following steps:

Step 1: Calculate the bolt spacing according to formulas (1)～(4) to ensure that the structure has good integrity under horizontal seismic loads:

G=[H+1.2(L+Q)]lh (1)

F _Ek =α _max G (2)

In the formula: G——representative value of gravity load; H——constant load; L——live load, Q——dynamic load; l——frame beam length; h——frame beam width; F _Ek ——structure level Standard value of earthquake action; α _max ——maximum value of horizontal earthquake influence coefficient; d——bolt rod diameter; n——bolt number;

——Bolt shear strength; d _b ——bolt spacing; t——beam flange thickness;

According to the structural requirements, when the bolt spacing d _b calculated by formulas (1) ~ (4) is greater than 15d ₀ , the bolt spacing is taken as 15d ₀ , where d ₀ is the bolt hole diameter;

Step 2: Design the plug-in component model with different parameters. The parameter variables include the thickness of the steel plate, the length of the two spliced steel plates of the L-shaped steel plate, the length of the two vertical steel plates of the U-shaped steel plate and the length of the steel plate of the U-shaped steel plate. ；

Step 3: Establish the ABAQUS finite element model; the element type of the steel plate is C3D8R, the tangential force model adopts the Coulomb model, the interface friction coefficient μ = 0.25, the normal contact is hard contact; the steel is connected by Tie constraint;

Step 4: Use the finite element software ABAQUS to analyze the force of the model, and obtain the stress cloud diagram and load-displacement curve of the plug-in component under different parameters;

Step 5: Determine the size requirements of the plug-in components according to the data statistics of the finite element software ABAQUS;

The size requirements of the plug-in components are as follows:

The thickness t of the steel plate of the plug-in component ranges from 5mm to 12mm;

_{The length l 1 of the} two spliced steel plates of the L-shaped steel plate pieces = 0.5 (h-4t ₁ );

The length of the two vertical steel plates of the U-shaped steel plate is l ₂ =l ₁ -t;

The horizontal steel plate length of the U-shaped steel plate is l ₃ = 4t;

In the formula: h——width of frame beam; t ₁ ——thickness of web of frame beam; in actual projects, for the convenience of construction, the _{lengths of l 1} , l ₂ , and l ₃ are rounded.

Preferably, the L-shaped steel plate piece is composed of a first horizontal steel plate and a first vertical steel plate vertically arranged at one end of the first horizontal steel plate, and the two steel plates are connected by welding.

Preferably, the U-shaped steel plate piece is composed of a second horizontal steel plate and two second vertical steel plates vertically arranged at both ends of the horizontal steel plate, and the three steel plates are connected by welding.

Preferably, the integrated house is installed according to the construction process from top to bottom. Before the integrated house is hoisted to the corresponding area in advance, the integrated house and the steel frame structure are positioned through plug-in components, and the hoisted house enters the corresponding depth direction. In the steel frame area, high-strength bolts are used to fasten the lower frame beam and the corresponding frame beam of the integrated house.

The beneficial effects of the application: a method for connecting frame beams and integrated house skeleton beams and a method for determining connection nodes, welding U-shaped steel plate parts on the upper skeleton beam of the integrated house, and welding the lower flange of the frame beam connected with the integrated house skeleton beam L-shaped steel plate parts. When hoisting, the integrated house and the frame beam can be accurately positioned through the plug-in components composed of U-shaped grooves and L-shaped steel. After being in place, the frame beam and the lower frame beam are connected by bolts. The connection node of this application has a simple structure and a uniform modulus; the integrated house and the frame beam can be accurately positioned through plug-in components; only the bolt connection is required for on-site assembly, which is easy to construct; the integrated house and the steel frame are easy to install and disassemble, and do not damage the steel The frame structure realizes the multiple use of the frame, achieves resource saving, relocation with houses, and reflects the high-fabricated building mode; it solves the overall stability problem of integrated houses in multi-storey and even middle- and high-rise residential buildings.

Description of the drawings

Fig. 1 is a schematic plan view of a connection structure between a frame beam and an integrated house frame beam provided by an embodiment of the application;

Fig. 2 is a schematic plan view of the connection between a skeleton beam and a U-shaped steel plate according to an embodiment of the application;

3 is a schematic plan view of the connection between the frame beam and the L-shaped steel plate according to an embodiment of the application;

4 is a schematic plan view of the connection between the frame beam and the frame beam according to an embodiment of the application;

Figure 5 is a schematic plan view of an L-shaped steel plate according to an embodiment of the application;

Fig. 6 is a schematic plan view of a U-shaped steel plate according to an embodiment of the application:

Number in the figure: 1. Frame beam; 2. Frame beam; 3. Plug-in components; 4. Bolt; 5. U-shaped steel plate; 5.1. The first horizontal steel plate; 5.2. The first vertical steel plate; 6. L-shaped steel plate Pieces; 6.1. The second horizontal steel plate; 6.2. The second vertical steel plate; 6.3. The second vertical steel plate; 7. Welds.

Detailed ways

The technical solutions of the present application will be described in detail below in combination with specific embodiments. However, it should be understood that without further description, elements, structures, and features in one embodiment can also be beneficially combined into other embodiments.

In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "inner", etc. are based on the orientation or positional relationship shown in FIG. In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be configured and operate in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, they can be fixed, detachable, or integrated. Ground connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood in specific situations.

The embodiments described are merely descriptions of the preferred implementations of the application, and do not limit the scope of the application. Without departing from the design spirit of the application, various modifications made by those of ordinary skill in the art to the technical solutions of the application All improvements and improvements shall fall within the scope of protection determined by the claims of this application.

Example 1

As shown in Figures 1 to 6, a method for connecting frame beams and integrated house frame beams includes frame beam 1, frame beam 2, plug-in assembly 3 and matching bolts 4; said plug-in assembly 3 includes a pair of The U-shaped steel plate part 5 and the L-shaped steel plate part 6 are matched together; the L-shaped steel plate part 5 is composed of a first horizontal steel plate 5.1 and a first vertical steel plate 5.2 vertically arranged at one end of the first horizontal steel plate 5.1; U-shaped steel plate part 6 is composed of a second horizontal steel plate 6.1 and two second vertical steel plates 6.2 and 6.3 arranged vertically at both ends of the horizontal steel plate. The steel plates are connected by welding, and the weld is 7.

In conjunction with the attached drawings, the integrated house is designed to have a length of 12m, a width of 8m, and a height of 3.3m. The steel frame structure has a column spacing of 6m in the depth direction and 8m in the opening direction. The column section specification is HW300×300×10×15, the steel is Q345B, and the high-strength bolts are 10.9-level frame beams and integrated building frame beams. The connection mode and the method of determining the connection nodes are further described in the embodiments.

Example 2

The method for determining the connection node between the frame beam and the frame beam of the integrated house includes the following steps:

Step 1: Calculate the bolt spacing according to formulas (1)～(4) to ensure that the structure has good integrity under horizontal seismic loads:

G=[H+1.2(L+Q)]lh (1)

F _Ek =α _max G (2)

In the formula: G——representative value of gravity load; H——constant load; L——live load, Q——dynamic load; l——frame beam length; h——frame beam width; F _Ek ——structure level Standard value of earthquake action; α _max ——maximum value of horizontal earthquake influence coefficient; d——bolt rod diameter; n——bolt number;

——Bolt shear strength; d _b ——bolt spacing; t——beam flange thickness;

According to the structural requirements, when the bolt spacing d _b calculated by formulas (1) ~ (4) is greater than 15d ₀ , the bolt spacing is taken as 15d ₀ , where d ₀ is the bolt hole diameter;

After calculation, the bolt spacing is 100mm;

Step 2: Design a set of plug-in component models with different parameters. The parameter variables include the thickness of the steel plate, the length of the two spliced steel plates of the L-shaped steel plate, the length of the two vertical steel plates of the U-shaped steel plate, and the horizontal setting of the U-shaped steel plate. Steel plate length

Step 3: Establish the ABAQUS finite element model; the element type of the steel plate is C3D8R, the tangential force model adopts the Coulomb model, the interface friction coefficient μ = 0.25, the normal contact is hard contact; the steel is connected by Tie constraint;

Step 4: Use the finite element software ABAQUS to analyze the force of the model, and obtain the stress cloud diagram and load-displacement curve of the plug-in component under different parameters;

Step 5: Determine the size requirements of the plug-in components according to the data statistics of the finite element software ABAQUS;

The value range of the thickness t of the steel plate of the plug-in component is 8mm;

The length of the two spliced steel plates of the L-shaped steel plate: l ₁ =0.5 (h-4t ₁ ) = 134mm; take 130mm.

The length of the two vertically arranged steel plates of the U-shaped steel plate: l ₂ =l ₁ -t = 126mm; take 125mm.

The length of the U-shaped steel plate set horizontally: l ₃ = 4t = 32mm; take 35mm.

Claims (5)

1. A connection mode of a frame beam and a frame beam of an integrated house and a method for determining connection nodes are characterized in that: the connection of the frame beam and the frame beam of the integrated house includes a frame beam, a frame beam, plug-in components and matching bolts. The connecting assembly includes a pair of U-shaped steel plate parts and L-shaped steel plate parts, and the two steel plate parts are snap-connected. The U-shaped steel plate parts are welded to the outer side of the upper frame beam of the integrated house, and the L-shaped steel plate parts are welded to and integrated The lower flange of the frame beam connected with the upper frame beam of the house, the lower flange of the lower frame beam of the integrated house and the upper flange of the connected frame beam are pre-opened with bolt holes and connected by high-strength bolts.
2. The connection method of a frame beam and an integrated house frame beam according to claim 1, wherein the L-shaped steel plate is composed of a first horizontal steel plate and a first horizontal steel plate vertically arranged at one end of the first horizontal steel plate. It is composed of vertical steel plates, and the two steel plates are connected by welding.
3. The connection method of the frame beam and the frame beam of the integrated house according to claim 1, wherein the U-shaped steel plate is composed of a second horizontal steel plate and two second horizontal steel plates vertically arranged at both ends of the second horizontal steel plate. It consists of two vertical steel plates, and the three steel plates are connected by welding.
4. The connection method of the frame beam and the frame beam of the integrated house according to claim 1, characterized in that: the integrated house is installed according to the construction process from top to bottom, and the integrated house is pre-hoisted to the corresponding area by inserting The components realize the positioning of the integrated house and the steel frame structure, the hoisted house enters the corresponding steel frame area along the depth direction, and the lower frame beam and the corresponding frame beam of the integrated house are fastened by high-strength bolts.
5. A method for determining the connection node between a frame beam and a frame beam of an integrated house includes the following steps:

   Step 1: Calculate the bolt spacing according to formulas (1)～(4) to ensure that the structure has good integrity under horizontal seismic loads:

   G=[H+1.2(L+Q)]lh (1)

   F _Ek =α _max G (2)

   

   

   In the formula: G——representative value of gravity load; H——constant load; L——live load, Q——dynamic load; l——frame beam length; h——frame beam width; F _Ek ——structure level Standard value of earthquake action; α _max ——maximum value of horizontal earthquake influence coefficient; d——bolt rod diameter; n——bolt number;

   

   ——Bolt shear strength; d _b ——bolt spacing; t——beam flange thickness;

   According to the structural requirements, when the bolt spacing d _b calculated by formulas (1) ~ (4) is greater than 15d ₀ , the bolt spacing is taken as 15d ₀ , where d ₀ is the bolt hole diameter;

   Step 2: Design the plug-in component model with different parameters. The parameter variables include the thickness of the steel plate, the length of the two spliced steel plates of the L-shaped steel plate, the length of the two vertical steel plates of the U-shaped steel plate and the length of the steel plate of the U-shaped steel plate. ；

   Step 3: Establish the ABAQUS finite element model, the element type of the steel plate is C3D8R, the tangential force model adopts the Coulomb model, the interface friction coefficient μ = 0.25, the normal contact is a hard contact, and the steels are connected by Tie constraints;

   Step 4: Use the finite element software ABAQUS to analyze the force of the model, and obtain the stress cloud diagram and load-displacement curve of the plug-in component under different parameters;

   Step 5: Determine the size requirements of the plug-in components according to the data statistics of the finite element software ABAQUS;

   The size requirements of the plug-in components are as follows:

   The thickness t of the steel plate of the plug-in component ranges from 5mm to 12mm;

   The length of the two spliced steel plates of L-shaped steel plates l ₁ ＝0.5(h-4t ₁ );

   The length of the two vertical steel plates of the U-shaped steel plate is l ₂ ＝l ₁ -t;

   The horizontal steel plate length of the U-shaped steel plate is l ₃ ＝4t;

   In the formula: h——frame beam width; t ₁ ——frame beam web thickness;

   In the actual project, for the convenience of construction, the _{lengths of l 1} , l ₂ , and l ₃ are rounded up.

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