高层建筑楼板水平地震内力的计算

复杂体形高层建筑,阴角部位的楼板常发生较严重的震害,其抗震分析应该包含楼板水平地震内力的计算。地震区的简单平面高层建筑,哪些情况可以采用装配式楼板,也需要通过楼板接头的抗震强度验算来判定。本文提出“串并联多质点系”力学模型及相应的数学模型,给出在地震作用下高层建筑各层楼板水平变形和内力的通用计算方法。此外,还选取了一定数量的框-墙结构高层建筑实例,对可能影响楼板水平剪力数值的各种因素,进行了系列的地震反应分析。

Calculation of Horizontal Seismic Stresses in Floor Slabs of Tall Buildings

It has been observed that during earthquake, the floor slabs at the inner corners of the junctions of complex-shaped tall buildings are more liable to severe damages. This fact points out that for an adequate aseismic design, the analysis should take into account the horizontal seismic stresses of the floor slabs so as to ascertain whether the horizontal diaphrams possess sufficient strength a-gainst such high seismic forces. This even applies to simple-shaped tall buildings with precast concrete floor slabs which are much weaker in shear than the cast-in-situ type.In this paper, the series-parallel lumped-mass system is taken as the appropriate mechanical model of the complex-shaped tall buildings. The conventional method of calculation is emplbyed and is hereby presented for the determination of deformations and stresses of the flooring system. By use of the above method, a number of 8 to 30 storied buildings are taken for case studies to investigate the various factors contributing to the shear stresses of the floor slabs.