【摘要】 某框架-核心筒超高层结构,采用钢管混凝土柱、型钢混凝土梁框架及钢筋混凝土核心筒的混合结构形式。弹塑性时程分析表明结构满足规范的"大震不倒"要求,并给出了结构薄弱部位。同时,以此工程为例,通过大量的计算,重点分析了地震波选取、阻尼比取值、钢筋强度等级等因素对计算结果的影响及大震弹性计算与大震弹塑性计算的区别。结果表明,对于超高层结构,地震波持时对结果影响很大,阻尼比改变对结果影响较小,采用HRB500钢筋后结构刚度有所增大,大震弹性和大震弹塑性的位移结果接近。更多还原

【Abstract】 The building discussed is a frame-tube tall building with circular concrete-filled steel tube column,steel reinforced concrete composite beam and concrete core tube shear wall.Performance in elastic-plastic time-history analysis shows that the goal of collapse prevention under expected rare earthquake is achieved,and the weak place of the building is given.Meanwhile,taking this project as an example,the influence of earthquake wave selections,damping ratio values and steel bar strength classes,also the difference between elastic response and elastic-plastic response under rare earthquakes were studied through a number of calculations.It is shown that for high rise buildings,duration of earthquake waves has a great influence on seismic performance while that of different damping ratios is little.It also can be seen that when using HRB500 steel bars the stiffness of the structure will increase and the displacement result of elastic analysis under rare earthquakes is close to that of elastic-plastic analysis.更多还原