CN105839791A - Double-side-plate supporting node of overhung cover plate - Google Patents

Abstract

The invention discloses a supporting double-side slab node of an overhanging cover slab, which includes a multi-cavity steel pipe concrete composite column and a reinforced H-shaped steel composite beam horizontally fixed on one side of the multi-cavity steel pipe concrete composite column through two side plates. Along the top of the reinforced H-shaped steel composite beam, there are two supporting upper cover plates and supporting lower cover plates distributed at an inclined angle between the two side plates, and the supporting square tubes are flatly pushed into the supporting upper cover plates and the supporting lower cover plates. In the supporting lower cover, together with reinforced H-shaped steel composite beams and multi-cavity concrete-filled steel tube composite columns, the supporting double-side slab joints of the extended cover are formed. As the edge constraining member of the entire steel tube concrete column, this node can improve its bearing capacity and energy dissipation capacity; it does not damage the multi-cavity steel tube concrete composite column, saving materials and labor. The overall structure satisfies the principle of "strong columns and weak beams, strong nodes and weak components". It has multiple anti-seismic fortification lines to avoid the damage of the overall system due to the damage of some components, and also has the necessary strength, good deformation capacity and energy dissipation capacity.

Description

A supporting double-side plate node of an overhanging cover plate

technical field

The invention relates to a supporting double-side slab node of an overhanging cover slab, which is mainly applied to the steel pipe concrete composite columns of multi-storey and high-rise buildings in the building structure.

Background technique

With the economic globalization and the improvement of urbanization level, the urban population density is gradually increasing, which makes a large number of high-rise buildings emerge continuously. There is an urgent need for new technologies to support the design and construction of high-rise and multi-storey buildings.

Concrete filled steel tube utilizes the interaction between the steel tube and concrete in the process of stress, that is, the restraint of the steel tube on the concrete makes the concrete in a complex stress state, so that the strength of the concrete is improved, and the plasticity and toughness are greatly improved. At the same time, after the steel pipe is filled with concrete, the buckling of the steel pipe wall can be avoided or delayed due to the supporting effect of the concrete. The combination of the two materials makes up for their respective shortcomings, making the material performance fully exerted.

With the development of society and the improvement of living standards, people have higher and higher requirements for the usable area and aesthetics of houses. The traditional round or square cross-section concrete-filled steel tube columns are usually not completely surrounded by walls, and a large part of the column feet protrudes from the interior of the room, occupying a certain amount of indoor space, which limits the furniture and room layout to a certain extent. The steel pipe concrete composite column with rectangular cross-section can be as wide as the wall, which solves the problem of protruding edges and corners of the column.

Studies have shown that for the general form of rectangular concrete-filled steel tube composite columns, the constraints of steel tubes on the core concrete are limited to the corner points, weaker at the periphery, and the bearing capacity is relatively low. The multi-cavity concrete-filled steel tube composite column whose end column is a rectangular steel tube is equipped with restraint members at the edge to improve its bearing capacity and energy dissipation capacity. Stiffening and tie measures are arranged laterally to divide the column body into several chambers, so that the restraint effect of the steel plate on the concrete Reinforce, reduce the aspect ratio of the steel plate at the same time, prevent or delay the local buckling of the steel plate.

Contents of the invention

The purpose of the present invention is to provide a simple construction and low cost steel pipe concrete composite column with stiffening ribs and a supporting double side plate node for the overhanging cover plate, which solves the problem of protruding edges and corners in the traditional column room and improves the performance of the multi-cavity steel pipe concrete composite column. bearing capacity and ductility. Delay or avoid the reduction of component stiffness, bearing capacity and ductility due to local buckling of the steel pipe wall plate, and give full play to the performance of the material. The overall structure satisfies the design principle of "strong columns and weak beams, strong nodes and weak components". The nodes have multiple seismic fortification lines, and have the necessary strength, good deformation capacity and energy dissipation capacity.

In order to achieve the above object, the present invention adopts the following technical solutions:

A supporting double-side slab node for an overhanging cover slab, comprising a multi-cavity concrete-filled steel pipe composite column, and a reinforced H-shaped steel composite beam horizontally fixed on one side of the multi-cavity steel-filled concrete composite column through two side slabs. On the top of the H-shaped steel composite beam and between the two side plates, there are two supporting upper cover plates and supporting lower cover plates distributed at inclined angles, and the supporting square tubes are pushed into the supporting upper cover plates and supporting lower cover plates Among them, the reinforced H-shaped steel composite beam and the multi-cavity steel pipe concrete composite column constitute the supporting double-side slab node of the overhanging cover slab.

Further, the reinforced H-shaped steel composite beam includes H-shaped steel, and two stiffeners arranged between the steel flanges at the ends of the H-shaped steel, and a pair of H-shaped steel edges are connected along both sides of the H-shaped steel web inside the stiffened ribs. The connecting parts are flush, and the upper and lower cover plates are respectively welded on the outer sides of the upper and lower flanges of the H-shaped steel.

Further, the connecting piece is an angle steel structure, and bolt holes are distributed on the outer end surface of the angle steel.

Further, the width of the upper cover plate and the lower cover plate is greater than the width of the upper and lower flanges of the H-shaped steel.

Further, the stiffeners are fixed on both sides of the web of the H-shaped steel.

Further, the side plate is a rectangular plate with a hypotenuse, and the hypotenuse is provided above the two extension sections clamped on the multi-cavity steel pipe concrete composite column.

Further, the side plate is provided with through holes corresponding to the bolt holes of the connectors.

Further, the supporting upper cover plate and the supporting lower cover plate are fixed up and down on the two side plates at an inclination angle of 30°-60°, wherein the supporting upper cover plate and the supporting lower cover plate are provided with a concave arc groove structure at the bottom .

Further, the width of the supporting upper cover plate and the supporting lower cover plate is greater than the width of the supporting square tube.

The supporting double side slab node of the present invention can be applied in the support frame system of the multi-cavity steel pipe concrete composite column supporting the horizontal pushing assembly.

The present invention can obtain following beneficial effect:

1) The reinforced H-shaped steel composite beam and the plug-in composite support are the same width as the multi-cavity steel pipe concrete composite column, which avoids protruding edges and corners of the indoor column, and can increase the usable area and aesthetics of the room.

2) The reinforced H-shaped steel composite beam and the pre-set supporting upper cover plate and supporting lower cover plate between the double side plates, and inserting the supporting square tube, as the edge restraining member of the entire steel tube concrete column, can improve its bearing capacity and energy consumption. ability.

3) Reinforced H-shaped steel composite beams and pre-set supporting upper cover and supporting lower cover between the double side plates, and then insert the multi-cavity concrete filled steel composite column as a whole, which improves the bearing capacity and ductility of the component. The on-site construction is convenient, and the multi-cavity steel pipe concrete composite column is not damaged, saving materials and labor.

4) Due to the use of multi-cavity steel pipe concrete composite columns, the steel pipes have a strong restraint effect on the concrete, and the overall bearing capacity and ductility of the column body are relatively good, which meets the design requirements of strong columns and weak beams.

5) The overall structure satisfies the design principle of "strong columns and weak beams, strong nodes and weak components". The nodes have multiple anti-seismic fortification lines to avoid the damage of the overall system due to the damage of some components, and also have the necessary strength and good deformation capacity and energy consumption.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the supporting double-side plate node supporting the double-side plate node of the overhanging cover plate of the present invention;

Fig. 2 (a)-(c) is the structural schematic diagram of reinforced H-shaped steel composite beam;

Figure 3 (a)-(c) is a schematic diagram of the structure of the multi-cavity concrete filled steel pipe composite column with side plates;

Figure 4 (a)-(d) is a schematic diagram of the joint structure of reinforced H-shaped steel composite beam and square tube and multi-cavity steel pipe concrete composite column;

Fig. 5 is a schematic diagram of the support frame system of the multi-cavity concrete filled steel pipe composite column applied in the support horizontal pushing assembly of the present invention;

Fig. 6 is (a)-(c) is the schematic diagram of beam yield failure process;

Fig. 7 is a schematic diagram of the hysteresis curve of a node.

In the figure: 1. Multi-cavity steel pipe concrete composite column; 2. Side plate; 3. Reinforced H-shaped steel composite beam; 3-1, H-shaped steel; 3-2, upper cover plate; 3-3, stiffening rib; 3- 4. Lower cover; 3-5. Connector; 4. Support upper cover; 5. Support square tube; 6. Support lower cover.

detailed description

The present invention will be described in further detail below in conjunction with specific embodiments.

As shown in Fig. 1, the supporting double-sided slab node of the overhanging cover slab of the present invention includes a multi-cavity concrete-filled steel pipe composite column 1, and a reinforced type that is horizontally fixed on one side of the multi-cavity steel-filled steel pipe concrete composite column 1 through two side plates 2 H-shaped steel composite beam 3, along the top of the reinforced H-shaped steel composite beam 3, between two side plates 7 are provided with two supporting upper cover plates 4 and supporting lower cover plates 6 distributed at inclined angles, supporting square tubes 5 is inserted into the support upper cover plate 4 and the support lower cover plate 6, together with the reinforced H-shaped steel composite beam 3 and the multi-cavity steel pipe concrete composite column 1, it constitutes the supporting double side plate node of the overhanging cover plate.

As shown in Figure 2 (a)-(c), the reinforced H-shaped steel composite beam 3 of the present invention includes H-shaped steel 3-1, and two stiffeners arranged between the shaped steel flanges at the end of H-shaped steel 3-1 Rib 3-3, the stiffener 3-3 is welded on both sides of the web of the H-shaped steel 3-1, and a pair of edges of the H-shaped steel 3-1 are welded on both sides of the web of the H-shaped steel 3-1 along the inner side of the stiffener 3-3 The flush connectors 3-5 are respectively welded with an upper cover plate 3-2 and a lower cover plate 3-4 on the outer sides of the upper and lower flanges of the H-shaped steel 3-1. Wherein, the connecting piece 3-5 is an angle steel structure, and bolt holes are distributed on the outer end surface of the angle steel. The width of the upper cover plate 3-2 and the lower cover plate 3-4 is greater than the width of the upper and lower flanges of the H-shaped steel 3-1.

As shown in Fig. 3(a)-(c), side plates 2 are fixed on both sides of the multi-cavity steel pipe concrete composite column of the present invention, and the supporting upper cover plate 4 and the supporting lower cover plate 6 are at an inclination angle of 30°-60° up and down. It is fixed on two side plates 2, wherein, the supporting upper cover plate 4 and the supporting lower cover plate 6 are provided with a concave arc groove structure at the bottom. The width of the supporting upper cover plate 4 and the supporting lower cover plate 6 is greater than the width of the supporting square tube 5 .

The side plate 2 is provided with through holes corresponding to the bolt holes of the connecting parts 3-5. It is convenient to be fixedly connected with the reinforced H-shaped steel composite beam 3. The side plate 2 is a rectangular plate provided with hypotenuses, and the hypotenuses are arranged above the two extended sections clamped on the multi-cavity concrete-filled steel tube composite column 1 .

As shown in Figure 4 (a)-(d), the installation process of the supporting double side plate node of the overhanging cover plate of the present invention is as follows:

1) Position the side plate 2 on both sides of the multi-cavity concrete-filled steel tube composite column 1 first, and then weld the side plate and the multi-cavity steel tube together by using three-sided fillet welds;

2) The two support upper cover plates 4-2 and the support lower cover plates 4-3 are connected and fixed to the two side plates according to the set angle by fillet welding;

3) Insert the pre-assembled reinforced H-shaped steel composite beam 3 between the side plates on both sides, temporarily fix the reinforced H-shaped steel composite beam 3 and the two side plates by tightening the mounting bolts, and then connect the side plates with the upper and lower cover plates and Connector welding;

4) Insert the supporting square tube 5 horizontally between the two supporting upper cover plates and the supporting lower cover plate, and weld the supporting square tube 5 with the supporting upper cover plate 4-2 and the supporting lower cover plate 4-3 by fillet welding Connected to complete the installation of the supporting double-side plate nodes of the overhanging cover plate.

As shown in FIG. 5 , the area indicated by the circle is a schematic diagram of the support frame system of the multi-chamber concrete-filled steel tube composite column applied in the support horizontal pushing assembly of the present invention. Single upper braces and horizontal beam braces to support the frame system.

The supporting double-side plate joints of the overhanging cover plate of the present invention can improve its bearing capacity and energy dissipation capacity. Because two side plates 2 are provided with support upper cover plate 4 and support lower cover plate 6 in advance, support square tube 5 is pushed into mode again, and insert inclined beam (support square tube 5) construction convenience at the scene, no need Damage multi-cavity steel pipe concrete composite column, saving material and labor.

In the following, the mechanical properties of the supporting double-side slab joints of the outrigger cover plate of the present invention will be described by taking the multi-cavity steel pipe concrete composite column-steel beam U-shaped rigid joint joint as a column.

Using ABAQUS software to conduct finite element analysis on the joints, the joint column is a 200x600 multi-cavity concrete-filled steel pipe composite column, the beam is made of H350x150x6x10 welded I-beam, and the thickness of both side plates and cover plates at the joint is the same as that of the beam flange. The results of finite element analysis are shown in Fig. 6(a)-(c).

Due to the use of multi-cavity steel pipe concrete composite columns, the steel pipes have a strong restraint effect on the concrete, and the overall bearing capacity and ductility of the column body are relatively good, which meets the design requirements of strong columns and weak beams. The failure sequence of multi-cavity CFST composite column-steel beam U-shaped rigid joints is shown in Fig. 6(a)-(c). When the external force is large, plastic hinges first appear at the beam end A far away from the joint connection area, as shown in Figure 6(a), the internal force is redistributed, and the bearing capacity of the structure increases; as the external force increases, the beam cover plate B precedes the side Figure 6(b) shows the appearance of plastic hinges in the plate; the final failure of the structure is shown in Figure 6(c). The energy dissipation capacity meets the design requirements of strong nodes and weak members.

The present invention is based on the principle of seismic concept design. The structure should have multiple seismic fortification lines to avoid the damage of the whole system due to the damage of some components. At the same time, it also requires the structure to have necessary strength, good deformation capacity and energy dissipation capacity. The supporting double-side slab joints of the overhanging cover slabs of the present invention adopt the multi-cavity steel pipe concrete composite column-steel beam U-shaped rigid joint joint form, adopt the isolation method of the column and the beam end, and connect through the node formed by the full-height side slab and the cover slab parts to transmit bending moments and shear forces at beam ends. When an earthquake occurs, plastic hinges first appear at the end of the beam, which consumes a certain amount of seismic energy to form the first seismic fortification line, and then plastic hinges appear on the cover plate to further dissipate the seismic energy to form the second seismic fortification line, and the side panels finally form Plastic hinges form the third seismic fortification line. The overall structure meets the design principle of "strong columns and weak beams, strong nodes and weak components", and the energy dissipation performance of the structure is relatively good. As shown in Figure 7, the hysteresis curve of the node is full, without obvious pinch phenomenon, the energy dissipation capacity of the node is good, and the deformation is large. When the earthquake comes, the residents have more time to escape.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. Under the circumstances, some simple inferences or substitutions can also be made, which should all be deemed to belong to the scope of patent protection determined by the submitted claims of the present invention.

Claims (10)

1. the supporting bilateral plate node of an overhanging cover plate, it is characterised in that: include multi-cavity steel tube concrete group Zygostyle, and the reinforced H profile steel of multi-cavity steel tube concrete coupled column side it is horizontally fixed on by two blocks of side plates Combination beam, is provided with two pieces of inclined angles between the top, two blocks of side plates of described reinforced H profile steel combination beam The support upper cover plate of degree distribution and support lower cover, under supporting square tube horizontal sliding enters described support upper cover plate and supports In cover plate, with the support that reinforced H profile steel combination beam, multi-cavity steel tube concrete coupled column constitute overhanging cover plate Dual-sided board node.

The supporting bilateral plate node of a kind of overhanging cover plate the most according to claim 1, it is characterised in that: Described reinforced H profile steel combination beam includes H profile steel, and setting between the section steel flange of H profile steel end Two pieces of ribbed stiffeners, have a pair along the H profile steel web both sides connection inside ribbed stiffener and flush with H profile steel edge Connector, H profile steel is respectively welded outside lower flange upper cover plate and lower cover.

The supporting bilateral plate node of a kind of overhanging cover plate the most according to claim 2, it is characterised in that: Described connector is steel angle structure, bolt hole is distributed on the outer face of angle steel.

The supporting bilateral plate node of a kind of overhanging cover plate the most according to claim 2, it is characterised in that: The width of described upper cover plate and lower cover is more than the width of lower flange in H profile steel.

The supporting bilateral plate node of a kind of overhanging cover plate the most according to claim 2, it is characterised in that: Described ribbed stiffener uses three skirt solid weldings to be scheduled on the web both sides of H profile steel.

The supporting bilateral plate node of a kind of overhanging cover plate the most according to claim 1, it is characterised in that: Described side plate is the rectangular slab being provided with hypotenuse, and hypotenuse is located at two pieces and is clamped in multi-cavity steel tube concrete coupled column The top of extension.

The supporting bilateral plate node of a kind of overhanging cover plate the most according to claim 1, it is characterised in that: Described side plate is provided with the through hole corresponding with connector bolt hole.

The supporting bilateral plate node of a kind of overhanging cover plate the most according to claim 1, it is characterised in that: Described support upper cover plate and support lower cover are that 30 ° of-60 ° of inclinations angle are fixed on two blocks of side plates up and down, wherein, Support upper cover plate and support lower cover is that bottom is provided with arcs of recesses groove structure.

The supporting bilateral plate node of a kind of overhanging cover plate the most according to claim 1, it is characterised in that: The width of described support upper cover plate and support lower cover is more than the width of supporting square tube.

10. according to the supporting bilateral plate node of a kind of overhanging cover plate described in any one of claim 1-9, It is characterized in that: the supporting bilateral plate node of an overhanging cover plate is supporting the multi-cavity steel tube concrete of horizontal sliding assembling Coupled column support frame system is applied.