（中国建筑西北设计研究院，西安710003）

［提要］建筑震害调查和结构实测数据表明，某些工业与民用建筑的屋盖和楼盖平面内的抗推刚度是有限的，地震时产生了显著的水平变形。对于此类半刚性楼盖房屋，用于计算水平地震作用的振动模型不能再沿用仅适用于刚性楼盖或柔性楼盖房屋的串联质点系。给出了半刚性楼盖房屋的抗震空间分析方法，为计入楼盖水平变形对质点水平地震作用数值和构件地震内力的影响，对于单向地震输入和双向地震输入，分别提出串并联质点系和双向串并联质点系振动模型，以计算结构的二维振型或三维振型以及相应的构件地震内力。可供《建筑抗震设计规范》修订时参考。

［关键词］半刚性楼盖房屋；楼盖水平变形；串并联质点系；双向串并联质点系

Aseismic Spatial Analysis of Buildings with Semi-rigid Diaphrams/Liu Dahai,Zeng Fansheng,Wang Min,Su Haitao(China  Northwest  Building  Design ＆ Research  Institute, Xi"an 710003,China)

Abstract:Seismic damage of buildings and surveying data of structures show that the stiffness of floorings is finite and the floorings have horizontal deformation during earthquake.For these buildings with semi-rigid diaphrams, the vibrational model for calculating the seismic action should not be based on series lumped mass system.The series-parallel lumped mass system and two way series parallel lumped mass system are adopted in order to calculate the twodimentional and three diamentional vibrational modes of structures during one-direction earthquake input and two directions earthquake input.

Keywords:building with semi-rigid diaphragms; horizontal deformation of flooring;seriesparallel lumped mass system; two way series-parallel lumped mass system