多维地震激励下结构碰撞振动台试验及碰撞影响参数研究

闫磊1,李青宁1,岳克峰1,赵花静1,申纪伟1,王天利2

振动与冲击 ›› 2018, Vol. 37 ›› Issue (15) : 43-50.

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (15) : 43-50.
论文

多维地震激励下结构碰撞振动台试验及碰撞影响参数研究

  • 闫磊1,李青宁1,岳克峰1,赵花静1,申纪伟1,王天利2
作者信息 +

Shaking table tests and pounding parametric analysis for structure collision under multi-dimensional seismic excitations

  • YAN Lei1,LI Qingning2,YUE Kefeng1,ZHAO Huajing2,SHEN Jiwei1, WANG Tianli2
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摘要

针对强震作用下桥梁结构碰撞导致灾变严重的问题,本文设计并制作4组变参数的结构碰撞多维激励地震模拟振动台试验,研究不同地震烈度和维度对相邻结构间碰撞响应的影响。结果表明,地震加速度峰值越大,维度越多,相邻结构间的碰撞力越大;不同碰撞单元均可模拟出结构间的最大碰撞力,但宜在碰撞计算中选择精度较高的Jan-Hertz-damp模型;碰撞模型中接触刚度的取值导致计算结果不一定能真实反映结构间的碰撞响应,且不同地震波也有可能使结构的计算碰撞刚度取值得到改变;碰撞间隙的大小对结构间最大碰撞力的影响并无统一规律,应针对不同的结构,计算其最优碰撞间隙;桥墩高度越矮,相邻梁体间的碰撞力越小,但墩底的冲剪作用却越明显;相邻结构之间的碰撞力及墩底剪力随其质量比和碰撞恢复系数的增大而增大,且对于不同地震波,其增大的幅度不尽相同。

Abstract

Aiming at bridge structure collisions causing serious disasters under the action of strong earthquake, shaking table tests for 4 designed and built groups of structure collisions with variable parameters under multi-dimension seismic inputs were conducted, and effects of seismic intensity and dimension on impact responses between adjacent structures were studied. The results showed that the greater the seismic peak acceleration and the more the seismic dimensions, the greater the pounding force between adjacent structures; different pounding elements can either be used to simulate the maximum pounding force between structures, but it is appropriate to choose Jan-Hertz-damp model with a higher accuracy to implement pounding calculations; the selection of contact stiffness in the pounding model causes the calculation results may not really reflect pounding responses between structures, and different seismic waves may make pounding stiffness value change; the effect of pounding gap value on the maximum impact force between structures has no uniform law, and the optimal pounding gap should be calculated for different structures; the shorter the pier height, the smaller the pounding force between adjacent beams, but the shear action at pier bottom is more obvious; the pounding force between adjacent structures and the shear force at pier bottom increase with increase in their mass ratio and the pounding recovery coefficient, and their increasing amplitude is different under different seismic waves.


关键词

多维激励 / 振动台试验 / 碰撞力 / 碰撞参数

Key words

multi-dimensional seismic excitation / shaking table test / pounding force / pounding parameter

引用本文

导出引用
闫磊1,李青宁1,岳克峰1,赵花静1,申纪伟1,王天利2. 多维地震激励下结构碰撞振动台试验及碰撞影响参数研究[J]. 振动与冲击, 2018, 37(15): 43-50
YAN Lei1,LI Qingning2,YUE Kefeng1,ZHAO Huajing2,SHEN Jiwei1, WANG Tianli2. Shaking table tests and pounding parametric analysis for structure collision under multi-dimensional seismic excitations[J]. Journal of Vibration and Shock, 2018, 37(15): 43-50

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