新型三维隔震礅振动台试验与数值分析

New Three-dimension Isolation Pier Vertical Vibration Table Test and Numerical Analysis

研究了一种以竖向圆柱螺旋压缩弹簧为隔震单元的新型三维隔震礅,介绍了隔震礅的构造和工作原理,通过静力试验确定三维隔震礅的竖向以及水平向刚度,在此基础上通过振动台试验研究了这种三维隔震礅的隔震效果。为定性研究三维隔震礅,采用VB编制计算程序对三维隔震礅的隔震性能进行数值分析,在加速度时程分析的基础上对单向与双向地震波作用下的梁端内力进行分析。振动台试验结果表明:三维隔震礅竖向以及水平向隔震系数均低于0.4,证明三维隔震礅具备良好的隔振性能。数值分析结果表明:在单向地震波作用下,隔震礅隔震系数低于0.4,双向地震波作用下,隔震礅隔震系数均低于0.6,证明三维隔震礅具有优秀的隔震效果。内力分析结果表明:竖向地震作用不可忽略。由此可知这种三维隔震礅具备良好的隔震效果,该新型三维隔震礅构造简易、效果良好,适于广大农村地区推广。

A new kind of three-dimension isolation pier in the unit of vertical cylinder helix compression spring was studied.The structure and the operation principle of the isolation pier were introduced.The vertical and horizontal rigidities of the three-dimension isolation pier were determined through static test,and the three-dimension pier＇s isolation effect was studied by vibrating table test.What＇s more,the VB computer program was used to do the numerical analysis for the qualitative research of the three-dimension pier.On the basis of the acceleration time-history analysis,the internal forces of the beam end under the unidirectional and bidirectional seismic waves were analyzed.The results of vibrating table test show that threedimensional isolation pier＇s horizontal and vertical isolation coefficients are less than 0.4,proving that the three-dimension isolation has a good vibration isolation effect.The results of numerical analysis show that the three-dimension isolation pier＇s isolation coefficient is less than 0.4 under unidirectional seismic wave,while its isolation coefficient is less than 0.6 under bidirectional seismic wave, which indicates that the three-dimension pier has a good isolation effect.Meanwhile,the results of internal force analysis show that the vertical seismic action＇s effect should not be neglected.With simple structure as well as good effects,this new three-dimensionisolation pier is suitable for the rural areas.