考虑P-δ效应及性能设计的某长柱分析及设计

ANALYSIS AND DESIGN ON SOME LONG COLUMNS WITH REGARD TO THE P-δ EFFECT AND SEISMIC PERFORMANCE DESIGN

某建筑工程方案中有若干个28.50m通高长柱,本文研究其考虑挠曲二阶效应(P-δ效应)、抗震性能设计和稳定问题的结构分析与设计方法。按照GB 50010-2010《混凝土结构设计规范》中的规定,分析长柱在P-δ效应影响下的弯矩放大情况,考虑了中震作用下的抗震性能设计;通过弹塑性动力时程分析对其在罕遇地震下的响应进行研究;另外,探讨了长柱的稳定问题和极限承载力。通过单榀模型的补充分析,考察经历罕遇地震后长柱的继续承载能力。

There are a number of 28.50m passes in a building project, this paper studies the structural analysis and design method of the two order effect （P-δ effect）, seismic performance design and stability problems. According to the GB 50010 -2010＂ Design Code for Concrete Structures＂, the ben- ding moments of long columns under the influence of P-δ effect are analyzed, and the seismic perform- ance. The response to the rare earthquakes was studied by elastic-plastic dynamic time history analysis, in addition, the stability and ultimate beating capacity of long columns are discussed. The supplementary analysis of single frame is also carried out, including the continuous load-bearing capacity after rare earthquake.