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与传统实腹梁相比,模块化装配式钢结构体系中的钢桁架梁腹部空隙大,更便于管线综合穿过,有效地增加了房间的净高,而且更加经济、美观。通过对钢桁架梁静力性能的试验及有限元分析研究,获得装配式钢结构体系中钢桁架梁极限承载力及变形破坏特征。钢桁架梁破坏位置集中于加载点附近上弦杆处,各腹杆应变均未达到屈服应变值,桁架梁弦杆先于腹杆破坏,符合结构“强剪弱弯”的设计原则;桁架梁极限荷载值与屈服荷载比值较大,说明构件从屈服到破坏有较大的安全储备;桁架梁有限元模拟结果与试验结果互相验证,有较好的吻合度。
Compared with the traditional solid beam, the steel truss girder in the modular assembled steel structure system has a large gap in the abdomen for easier integration of the pipeline, which effectively increases the net height of the room and is more economical and beautiful. Through the experiment and finite element analysis of the static performance of steel truss girder, the ultimate bearing capacity and deformation and failure characteristics of the steel truss girder in the fabricated steel structure system are obtained. The damage position of the steel truss girder concentrated on the upper chord near the loading point, the strain of each web did not reach the yield strain value, and the truss beam chord was damaged before the web, which conformed to the design principle of “strong shear weak bend”; truss The ratio between the ultimate load and the yield load of the beam is large, which shows that the member has a large safety margin from yielding to failure. The simulation results of the truss beam and the test result verify each other and have a good agreement.