梁式转换层异型柱框架的地震作用效应

Seismic Responses of RC Frame Structures with Special-Shaped Columns and Girder-Transfer Story

采用底部2层为大空间商场、上部为住宅的高层建筑作为建模分析对象,模拟实际工程情况,按国家有关设计规范要求,针对抗震设防烈度7度和8度、场地土Ⅰ～Ⅳ类等不同组合,采用振型分解反应谱法和弹性时程分析法分析计算了72例钢筋混凝土梁式转换层异型柱框架高层建筑.对受小震作用的钢筋混凝土梁式转换层异型柱框架体系的层变形、层剪力及基底倾覆力矩变化规律进行了分析,得出若干可供设计参考的结果.

High rising buildings with a large bay supermarket on their two lowest stories and dwelling houses on the other stories were taken as the discussed object. Based on the relative national design codes and their engineering conditions, seismic responses of 72 high rising buildings of RC frame structures with special-shaped columns and a girder-transfer story were calculated respectively using the modal analysis method and the elastic time-history method, and in the calculation, different combinations of fortification intensities 7 and 8 and site soil types Ⅰto Ⅳ were considered. From the calculated result, the changes in their story drift, story shear and moment on structural bottom were analyzed under the condition of frequently occurred earthquakes, and some conclusions helpful for the design of high rising buildings were obtained.