高层钢框架结构考虑P-Δ效应的弹性层间有害位移的简化计算

Simplified calculation of elastic harmful inter-story drift of high-rise steel frame structure considering P-Δ effect

高层钢框架结构在水平荷载作用下,层间位移包含有害位移和无害位移两部分。在结构侧移的传统计算中,通常忽略P-Δ效应的影响;在二阶侧移计算中,也未从有害位移的角度进一步分析,这对较柔的高层钢框架结构来说会造成较大的误差。因此,针对这一问题,提出了高层钢框架结构考虑P-Δ效应影响的弹性层间有害位移的简化计算方法。通过采用简化方法和对角撑法对一个承受水平均布荷载的15层纯钢框架结构进行模拟计算对比,并讨论了P-Δ效应对层间有害位移的影响。结果表明提出的简化方法实用可行,能够很好地满足工程的实际需求。

The inter-story drift of high-rise steel frame structure is composed of harmful drift and harmless drift under horizontal load. The influence of P-Δ effect is usually ignored in the traditional calculation of structural lateral displacement, and the harmful drift is not further analyzed in the calculation of second-order lateral displacement. It will produce larger error for the flexible high-rise steel frame structure. Therefore, in order to solve this problem, a simplified method of the elastic inter-story harmful drift of high-rise steel frame structure considering P-Δ effect was proposed. The results using the simplified method and the diagonal bracing method of a 15-story steel frame structure under horizontal uniform load were compared. And the influence of P-Δ effect on harmful drift was discussed. The results show that the simplified method is practical and feasible, and can well meet the actual needs of the project.