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针对提高负弯矩作用下连续梁的结构特性提出了一种新型的部分混凝土外包波形钢腹板组合工字梁。对这种混凝土外包组合工字梁在对抗荷载下的抗剪性能进行试验分析研究。试验结果显示与普通的工字梁相比,混凝土外包组合工字梁的剪切屈曲因受外包混凝土的限制而有了更好的抗剪强度。由于组合截面的抗剪刚度是基于波形钢腹板和破裂前外包混凝土平均厚度的总和,且其抗剪强度决定了由钢腹板和外包混凝土共享的抗剪强度比。此外,根据试验中的破坏模式和应变分布,提出部分混凝土外包波形钢腹板组合工字梁的预估抗剪强度。试验结果验证了之前分析得出的弹性阶段的抗剪刚度和抗剪比。且之前计算得出的钢腹板与组合梁的抗剪强度也与试验结果一致。通过对比可知文中提到的分析方法可以应用到部分混凝土外包波形钢腹板组合工字梁结构的抗剪刚度预估和抗剪强度设计中去。
Aiming at the structural characteristics of continuous beams under the action of negative bending moment, a new type of partially corrugated steel web composite I-beam was proposed. The experimental analysis of the shear resistance of the I-beam with concrete-encased composite beams under confrontation load is carried out. The test results show that the shear buckling of the I-beam with concrete outsourcing has better shear strength due to the limitation of the outsourced concrete compared with the normal I-beam. Since the shear stiffness of the combined section is based on the sum of the average thickness of the corrugated steel web and the pre-cracked concrete, and its shear strength determines the shear strength ratio shared by the steel web and the overburden concrete. In addition, according to the failure mode and strain distribution in the experiment, the predicted shear strength of the I-beam with partially corrugated steel webs is proposed. The experimental results verify the shear stiffness and shear ratio of the elastic phase obtained in the previous analysis. The calculated shear strength of the steel web and the composite beam is also consistent with the experimental results. By comparison, we can see that the analysis methods mentioned in this paper can be applied to the design of shear rigidity and shear strength of I-beam with partially corrugated steel webs.