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现有的钢-混凝土组合梁在采用连续梁体系时中间支座附近承受负弯矩会使上层混凝土板容易产生受拉裂缝,进而对工字钢下翼缘及腹板增加压力,易引起局部失稳。解决此缺陷的措施是在负弯矩区钢梁下翼缘增设混凝土板,通过剪力件与钢梁连接,其作用是使钢梁下翼缘“固结”于混凝土板内,增强钢梁的局部抗稳定能力,即复合混凝土板组合梁。本文将复合混凝土板组合梁节段假定为弹性夹层,利用Abaqus6.5建立双层混凝土板组合梁空间模型,采用滑移单元slide-plane模拟剪力连接件,重点研究下部混凝土板剪力度的变化对钢梁应力的影响。
When the existing steel-concrete composite beams bear the negative bending moment near the intermediate support when the continuous beam system is adopted, the upper concrete slab will easily produce tensile cracks, which will increase the pressure on the lower flange and web of the I-beam, Instability. The solution to this defect is to add a concrete slab at the lower flange of the steel beam in the negative moment area and connect it with the steel beam through the shear component. The purpose of this defect is to make the lower flange of the steel beam “solidify ” in the concrete slab and enhance Local anti-stability of steel beams, that is, composite concrete composite beams. In this paper, the composite concrete slab composite beam section is assumed to be elastic interlayer. Abaqus6.5 is used to establish the space model of the composite beam with double-layer concrete slab, and the sliding element slide-plane is used to simulate the shear connection. Influence on the stress of steel beam.