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在海城、唐山地震中大量单层厂房的破坏情况表明,厂房发生侧移和扭转振动的同时,屋盖自身还产生显著的纵向和横向水平变形。一些厂房的实测变形曲线和屋盖动力实验,则进一步给出了屋盖水平刚度的具体数值。为了确切反映非对称单层厂房的实际振动性状,合理确定构件地震内力,本文提出考虑厂房扭转、屋盖变形和围护墙刚度三要素的空间结构力学模型和“串并联多质点系”计算简图,进行双向地面平动分量作用下的三维振动分析。实例计算表明,此方法能较好地反映单层厂房的震害规律。
The destruction of a large number of single storey buildings in the Haicheng and Tangshan earthquakes shows that the house roofs also exhibit significant horizontal and vertical horizontal deformations while they are undergoing lateral and torsional vibrations. Some measured deformation curves of the factory building and roof dynamic experiments further give concrete values of the horizontal stiffness of the roof. In order to accurately reflect the actual vibration behavior of an asymmetric single storey building, and to reasonably determine the earthquake internal forces of components, this paper proposes a spatial structural mechanics model considering the three elements of the building torsion, roof deformation and the stiffness of the retaining wall, and the “series-parallel multi-particle system” calculation. Fig. 3D vibration analysis under bidirectional ground translational components. The example calculation shows that this method can reflect the earthquake damage law of a single storey building.