《Earthquake Engineering and Structural Dynamics》杂志刊登“空间变化的地面运动对桥梁撞击影响的实验研究”

 
作者：Bo Li, Kaiming Bi, Nawawi Chouw,John W. Butterworth, Hong Hao
刊物：《Earthquake Engineering and Structural Dynamics》，2012年，41卷第14期，1959-1976页
关键词：空间变化的地面运动；撞击；相对位移；振动台试验；桥梁地震反应
摘要：在许多大地震中，桥梁损害的重要原因之一是由于相邻桥梁之间产生大的邻桥撞击。原因是相邻桥梁间的相对位移大于结构本身之间的预设缝。这种相邻结构反应不仅受控于相关结构本身的动力特性，而且受控于地面激励的特征。研究者已经研究过空间变化的地面运动的影响结果，但是，这些研究都是通过数值计算来进行的。本研究的目的是通过对三个相邻的桥段进行试验研究来评价空间变化的地面运动对桥梁撞击的影响。本实验应用了三个振动台。输入的空间变化的地面激励是基于新西兰考虑相干损失函数的软基、浅基和坚实地基的三种不同设计地震反应谱来模拟的。结果表明:空间上变化的地面运动增加了相邻主桥梁之间的相对位移和撞击力。

Experimental investigation of spatially varying effect of ground motions on bridge pounding

Authors: Bo Li, Kaiming Bi, Nawawi Chouw,John W. Butterworth, Hong Hao
Journal: Earthquake Engineering and Structural Dynamics，Volume 41, Issue 14,pages 1959–1976, November 2012
Key words: ground motion spatial variation; pounding; relative displacement; shake table experiment; bridge seismic response
Abstract: Pounding between adjacent bridge structures with insufficient separation distance has been identified as one of the primary causes of damage in many major earthquakes. It takes place because the closing relative movement is larger than the structural gap provided between the structures. This relative structural response is controlled not only by the dynamic properties of the participating structures but also by the characteristics of the ground excitations. The consequence of the spatial variation of ground motions has been studied by researchers; however, most of these studies were performed numerically. The objective of the present research is to experimentally evaluate the influence of spatial variation of ground motions on the pounding behaviour of three adjacent bridge segments. The investigation is performed using three shake tables. The input spatially varying ground excitations are simulated based on the New Zealand design spectra for soft soil, shallow soil and strong rock using an empirical coherency loss function. Results confirm that the spatially no uniform ground motions increase the relative displacement of adjacent bridge girders and pounding forces.

原文链接：http://onlinelibrary.wiley.com/doi/10.1002/eqe.2168/abstract
翻译：徐金英；审核：安鹏