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建筑结构在强烈地震过程中,一般处于弹塑性受力状态,同时结构的薄弱层将产生变形集中现象。对于高层建筑,P—△效应的影响明显变大。因而我国即将发布的“建筑设计抗震规范”规定,特别不规则的建筑,甲类建筑和大于一定高度的高层建筑,要采用时程法进行弹塑性地震反应分析,对于超过12层的建筑要采用时程法进行变形验算。某些高
In the process of strong earthquakes, the building structure is generally in an elasto-plastic state, and at the same time, the weak layer of the structure will produce a phenomenon of deformation concentration. For high-rise buildings, the influence of the P-△ effect becomes significantly larger. Therefore, China’s forthcoming “Code for Seismic Design of Architectural Design” stipulates that special irregular buildings, Class A buildings, and high-rise buildings larger than a certain height must be subjected to elasto-plastic seismic response analysis using the time-history method, and should be adopted for buildings with more than 12 floors. The time history method performs deformation checking. Some high