地表变形与地震共同作用下框架结构受力分析

Force analysis of frame structure under interaction of residual deformation and earthquake in mined-out area

采空区利用是矿区研究的重要组成部分,通过分析框架结构在地表变形与地震力共同作用下的受力和变形后得出:随着负曲率值的增大,基底反力两端加载中间卸载明显,柱底轴力由边柱向中柱转移趋势明显,同时梁两端弯矩及剪力均有不同程度的增加;在正曲率变形作用下,变化规律与负曲率正好相反。地震作用使得框架结构的受力和变形不再对称,发生偏移,并且最大值均有不同程度的增加,因此进行采空区建筑结构设计时应当综合考虑矿区地质资料和抗震设防。

Reconstruction is an important aspect of goaf utilization,according to the force analysis of frame structure under interaction of residual curvature deformation and earthquake force,we draw the conclusion that,with the increase of negative curvature,two ends＇ base reaction increase while intermediate base reaction decrease,axial force of column base transfer from side column to interior column,and the moment and shear of beam ends increase at different degrees.The positive curvature＇s change law is opposite to negative curvature＇s.Due to earthquake,stress and deformation of frame structure occurs an offset,which are no longer symmetric,and their maximum increase at different degrees.Therefore,geological data of mining area and seismic fortification should be taken into account for structural design in mined-out area.