CN201158899Y - Steel Truss Steel Reinforced Concrete Beam - Google Patents

Abstract

A steel truss steel-reinforced concrete beam, the steel truss steel frame is composed of vertical bars, edge bars and oblique bars. Wherein, the vertical bar and the edge bar form a rectangular structure, and the oblique bar is obliquely welded between the upper edge bar, the lower edge bar and the vertical bar. By adopting the steel truss steel reinforced concrete beam described in the utility model, the height of the steel truss can be adjusted according to the height of the beam section. T-shaped steel or channel-shaped steel can be arranged on the upper and lower edges of the beam to give full play to the strength of the steel. Effectively improve the bonding performance of steel truss steel reinforced concrete beams and concrete. The steel truss is used to bear the load in the construction stage, and the formwork is hung on the steel truss, which saves the support and saves the construction cost.

Description

Steel Truss Steel Reinforced Concrete Beam

1. Technical field

The utility model relates to construction engineering and bridge engineering beam structures, in particular to a steel truss steel-reinforced concrete beam.

2. Background technology

Steel reinforced concrete structure (Steel Reinforced Concrete Structure) referred to as SRC structure is a new form of steel and concrete composite structure, that is, a composite structure system in which steel is configured in ordinary reinforced concrete structures. It uses the steel structure as the skeleton and is covered with reinforced concrete, so that the internal steel frame of the SRC member and the externally covered concrete form a whole and bear the force together. Its mechanical performance is better than the simple superposition of the two structures of steel frame and reinforced concrete. The steel reinforced concrete structure has high strength, high rigidity, good ductility and energy dissipation performance, and the structure composed of steel reinforced concrete members has good seismic performance.

Compared with the steel structure, the outer reinforced concrete part of the steel reinforced concrete member can effectively prevent the local buckling of the steel reinforced concrete member, and can improve the durability, fire resistance and overall stiffness of the steel member, and significantly improve the plane torsional buckling performance of the steel reinforced concrete , so that the strength of steel can be fully exerted, and it has greater rigidity and damping than pure steel structure. The use of steel-reinforced concrete structures can generally save more than 50% of steel compared with pure steel structures. In addition, concrete is the best protective layer for steel structures, and it is obviously superior to steel structures in terms of fire prevention, corrosion resistance and rust prevention.

At present, for steel reinforced concrete beams, the steel frame is mainly matched with solid belly steel, mainly I-shaped steel. In addition to the above-mentioned advantages, the solid-belly steel-reinforced concrete structure also has some shortcomings, mainly as follows: 1) Due to the limitation of the height of the solid-belly I-shaped steel, it is not suitable for large-span structures with high cross-sections; The strength of the abdominal section steel is not fully utilized; 3) The bond between the solid web section steel and concrete is weakened to a certain extent compared with the ordinary reinforced concrete structure; 4) The solid web section steel is a symmetrical section, which is not conducive to Reduce the amount of steel used for section steel and give full play to the compressive effect of concrete.

3. Contents of the invention

The purpose of this utility model is to provide a steel truss steel reinforced concrete beam suitable for a large-span structure with a high section, which can adjust the height of the steel truss according to the height of the beam section, and is not limited by the height of the I-shaped steel.

The utility model achieves the above-mentioned purpose by the following technical scheme: providing a steel truss steel-reinforced concrete beam, the steel truss steel frame of which is composed of vertical bars, edge bars and oblique bars. Among them, the vertical bar and the edge bar form a rectangular structure, the oblique bar is obliquely welded between the upper edge bar, the lower edge bar and the vertical bar, and the stirrups and structural longitudinal reinforcement are the same as the reinforced concrete beam with solid abdominal steel.

The steel-reinforced concrete beam of the steel truss can be made into a rectangular section or a T-shaped section beam.

The section steel in the steel frame of the steel truss may be T-shaped section steel, angle steel, channel steel.

The outstanding advantages of the utility model are:

1. Steel truss steel reinforced concrete beams are used, and T-shaped steel or channel-shaped steel is arranged on the upper and lower edges of the beams. The height of the steel truss can be adjusted according to the height of the beam section. It is not limited by the height of the I-shaped steel and can give full play to the strength of the steel.

2. Effectively improve the bonding performance of steel truss steel reinforced concrete beams and concrete.

3. The amount of steel used in the compression zone can be reasonably designed according to the structural needs.

4. Since the steel truss itself has a certain bearing capacity, the steel truss can be used to bear the load during the construction stage, and the formwork can be hung on the steel truss, which saves the support and saves the construction cost. It is a kind of bridge structure that is not easy to set up support technological innovation.

4. Description of drawings

Fig. 1 is a schematic diagram of the steel frame structure of the steel truss described in the present invention.

Fig. 2 is a schematic diagram of a steel truss steel reinforced concrete rectangular section beam described in the utility model.

Fig. 3 is a schematic diagram of a steel truss steel reinforced concrete T-shaped section beam described in the utility model

5. Specific implementation

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

Referring to Fig. 1, the steel truss steel frame concrete girder described in the utility model, its steel truss steel frame is made up of vertical bar 1, upper edge bar 2, lower edge bar 3, oblique bar 4. Wherein, the vertical bar 1 , the upper edge bar 2 and the lower edge bar 3 form a rectangular structure, and the oblique bar 4 is obliquely welded between the upper edge bar 2 and the lower edge bar 3 . The same structure as that of the solid-belt steel-reinforced concrete beam requires the configuration of stirrups and structural longitudinal reinforcement, the formwork is suspended on the steel truss steel frame, and the cast-in-place concrete forms the steel truss steel-reinforced concrete section beam. Example: The section size of a steel concrete beam is b×h=450mm×850mm, the beam span is 12m, and the design bending moment M=1278 kN·M. Two design schemes are adopted to design the steel-reinforced concrete structural beam of solid-web type and the steel-reinforced concrete beam of steel truss. The concrete strength grade is C30, the section steel adopts Q345 steel, and the longitudinal reinforcement HRB400. Adopt solid-web type steel-reinforced concrete beam scheme: after design and calculation, the section steel is hot-rolled HZ600, the longitudinal tension reinforcement of the beam is 4φ18, the longitudinal compression reinforcement is 2φ18, and the structural reinforcement of 3φ12 is equipped on both sides of the beam, and the solid-web type steel The amount of steel used in the bone concrete structural beam scheme is 1676.7kg. Steel truss steel-reinforced concrete beam scheme: after design calculation, the angle steel type 6.3/4 (B=63, b=40, d=4) is used for the vertical bar 1 and the oblique bar 4, the vertical bar spacing is 500mm, and the upper edge bar is 2 Use hot rolling HK140a to divide and process it into a T shape, and use hot rolling HK180a to divide and process the lower edge bar 3 into a T shape. The vertical bar 1, the upper edge bar 2, and the lower edge bar 3 form a rectangle with a height of 800mm. The compression steel bar is 2φ18, and the structural steel bars of 3φ12 are equipped on both sides of the beam. The steel truss steel reinforced concrete structural beam scheme uses 782.2kg of steel. The steel truss steel reinforced concrete structural beam scheme saves 53.3% of steel than the solid web steel reinforced concrete structural beam scheme.

Claims (3)

1, a kind of steel truss steel framed concrete beam, comprise stirrup and structure longitudinal reinforcement, it is characterized in that in concrete beam, joining the steel truss reinforcing bar, it is to be made of montant, edge bar, brace for the steel truss reinforcing bar, wherein, montant and edge bar are formed rectangular configuration, and brace is oblique to be welded between upper limb bar, lower edge bar and the montant.

2, steel truss steel framed concrete beam according to claim 1 is characterized in that the steel truss steel framed concrete beam can make square-section or T section beam.

3, steel truss steel framed concrete beam according to claim 1 is characterized in that the shaped steel in the described steel truss reinforcing bar can be tee bar, angle steel, channel-section steel.

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