足尺柱承重模块化钢框架稳定承载力试验研究

Full-scale Experimental Study on Stability Bearing Capacity of Columnsupported Modular Steel Frame

为研究竖向荷载作用下柱承重模块化钢框架的受力性能、破坏机理及模块间节点对结构整体受力性能的影响,进行了模块间节点静力受弯试验与足尺2层单跨模块化钢框架竖向静力加载试验,分别得到模块间节点的刚度属性及模块化钢框架的整体稳定承载力与破坏模式。最后,考察了模块间节点对模块化钢框架结构整体性能的影响,并验证了结构稳定承载力理论计算模型与数值分析模型。结果表明:模块间节点的半刚性属性对模块化钢框架的稳定承载力影响较大,设计时应加以考虑;竖向荷载作用下模块化钢框架破坏模式为上下层模块角柱整体失稳;子结构模型能够较好地计算柱承重模块化钢框架的整体稳定承载力。

To investigate the mechanical properties, failure mechanism, and the influence of the connection on the overall performance of the column-supported modular steel frame under vertical loading, the experimental study on specimens of the module-to-module joints and twostory-single-bay modular steel frame was conducted. The rotational stiffness of the module-to-module joints, the overall stability bearing capacity and the failure mode of the modular steel frame were obtained. Finally, the overall response of the modular steel frame and the joint behavior were also carefully observed, and the theoretical calculation model and numerical analysis model of the stability bearing capacity of the structure were verified.The module-to-module joint is classified as the semi-rigid type. Therefore, the effects of semi-rigid joints should be adequately taken into consideration in design. The failure mode of the modular steel frame under vertical loading is the overall instability of the upper and lower modular corner columns. The substructure model can preferably calculate the overall stability bearing capacity.