中柱失效工况下单层组合框架受力理论分析

基于已有试验,本文提出了轴向弹簧和转动弹簧约束的组合框架简化计算模型,推导了在集中荷载作用下刚性、半刚性连接平面组合梁双跨钢框架移除中柱后的荷载-跨中挠度曲线计算公式,考虑了压拱效应和连接刚度的影响,将公式计算结果与试验结果进行对比证明了推导过程和计算公式的可靠性.在对比结果的基础上,根据已有试验和模拟结果对已有悬索阶段的计算公式进行修正,修正后的公式与试验结果吻合较好.

Theoretical Analysis of Single-Story Composite Frame in the Scenario of Middle Column Loss

In this paper, the simplified calculation model of composite frame with axial spring and rotational spring constraints is proposed. The calculation formula of the load-deflection curve of the simplified model under concentrated load is derived, considering the influences of the arch action and the connection stiffness. The calculation results are compared with the experimental results to prove the reliability of the derivation process and calculation formula. On the basis of the comparison, the existing formula for catenary stage is modified according to the existing test and simulation results, leading to better consistency between the revised formula and the test results.