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Steel-concrete composite beam adopting elastic concrete

A kind of elastic concrete and concrete technology, which is applied in the direction of load-bearing elongated structural members, climate sustainability, structural elements, etc., can solve the problems of fatigue damage, bearing capacity and durability reduction, etc., and achieve the reduction of repair rate, Effects of improved thermal conductivity and improved fire resistance

Inactive Publication Date: 2014-07-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The mechanical characteristics of steel-concrete composite beams are that the lower steel is in tension and the upper concrete is in compression. Its advantages are high bearing capacity, strong stability, good durability, and convenient construction. However, this composite structure also has some shortcomings, namely Fatigue damage problem, fatigue fracture belongs to brittle damage, which greatly reduces the bearing capacity and durability of the structure

Method used

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  • Steel-concrete composite beam adopting elastic concrete
  • Steel-concrete composite beam adopting elastic concrete
  • Steel-concrete composite beam adopting elastic concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 and figure 2 As shown, the steel-concrete composite beam using elastic concrete is mainly composed of three parts, namely elastic concrete slab 1, steel beam 2 and shear connector 3. The shear connector 3 is welded on the steel beam 2, and elastic concrete is poured on the steel beam 2 to form an elastic concrete slab 1, so that the shear connector 3 is placed in the elastic concrete to ensure that the elastic concrete and the steel beam 2 work together.

[0027] The steel-concrete composite beam is designed in accordance with the design method in the section of steel and concrete composite beams in the "Code for Design of Steel Structures" (GB50017-2003). The crack check calculation and structural measures must meet the current national standards "Code for Design of Steel Structures" (GB50017-2003) and "Code for Design of Concrete Structures" (GB50010-2010).

[0028] The elastic concrete slab 1 is poured on the steel beam 2 with the formwork support...

Embodiment 2

[0034] The only difference between Example 2 and Example 1 is that the elastic concrete used consists of 50 parts by weight of rubber particles, 400 parts of cement, 704 parts of stones, 708 parts of sand, 167 parts of water, and 5 parts of water reducing agent.

[0035] Through testing, it is found that the cubic compressive strength of the elastic concrete used in this embodiment can reach 45.1MPa, the modulus of elasticity is 2.790E+4, and the slump exceeds 100mm, which is suitable for engineering applications.

[0036] At the same time, through composite beam tests and finite element verification, it is found that in the steel-concrete composite beam of this embodiment, the slippage between steel and elastic concrete is 1.2 times the slippage between steel and ordinary concrete, that is, the combination of the former Stronger capability and greater flexibility. At the same time, the fatigue test found that after using the elastic concrete, the fatigue life of the steel-concr...

Embodiment 3

[0038] The only difference between Example 3 and Example 1 is that the elastic concrete used consists of 150 parts by weight of rubber particles, 495 parts of cement, 967 parts of stones, 1004 parts of sand, 166 parts of water, and 9 parts of water reducing agent.

[0039] The cubic compressive strength of the elastic concrete used in this embodiment can reach 38.5MPa, the modulus of elasticity is 1.445E+4, and the slump is 90mm, which is still suitable for engineering application.

[0040] At the same time, through composite beam tests and finite element verification, it is found that the steel-concrete composite beam of this embodiment has a slippage between steel and elastic concrete that is 1.4 times the slippage between steel and ordinary concrete, that is, the combination of the former Stronger capability and greater flexibility. At the same time, the fatigue test found that after adopting the elastic concrete, the fatigue life of the steel-concrete composite beam is 1.7...

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Abstract

The invention discloses a steel-concrete composite beam adopting elastic concrete. The steel-concrete composite beam comprises a steel beam and a shear connector welded on the steel beam, wherein an elastic concrete slab is poured on the steel beam; the shear connector is arranged in the elastic concrete slab; the elastic concrete slab is formed by pouring and maintaining the elastic concrete. According to the steel-concrete composite beam, the fatigue damage to the concrete slab can be effectively prevented; furthermore, due to the powerful deformability and anti-cracking ability of the elastic concrete, the deformation of the elastic concrete and the shear connector is harmonious, and the fatigue life of the shear connector wrapped in the elastic concrete can be effectively prolonged; meanwhile, the carrying capacity is guaranteed, the construction technology is simplified, and the project popularization can be facilitated.

Description

technical field [0001] The invention belongs to a steel-concrete composite beam structure, and in particular relates to a steel-concrete composite beam using elastic concrete. Background technique [0002] The steel-concrete composite beam structure composed of steel beams, reinforced concrete slabs and shear connectors has been developed in my country for more than 90 years, and its application technology fields are extensive, including urban bridges, highway bridges, railway bridges, large Deck structures of span arch bridges, suspension bridges and cable-stayed bridges; multi-storey workshop floors in industrial buildings, working platform beams, crane beams, trestles and composite floors in civil and high-rise buildings. [0003] The mechanical characteristics of steel-concrete composite beams are that the lower steel is in tension and the upper concrete is in compression. Its advantages are high bearing capacity, strong stability, good durability, and convenient construc...

Claims

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Application Information

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IPC IPC(8): E04C3/293C04B28/00C04B18/22
CPCY02W30/91
Inventor 韩庆华王一泓邢颖徐杰芦燕
Owner TIANJIN UNIV
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