【摘要】 针对我国西部山区典型的高墩桥,建立了某桥的纤维单元模型;在各伸缩缝处梁间设置多个间隙单元模拟碰撞,采用非线性时程反应分析方法对模型进行运算,通过比较和分析计算结果,探讨了该高墩桥在不同地震波输入下的碰撞反应以及碰撞对结构的影响。分析结果表明,地震波的频谱特性与结构各部分的固有频率是影响结构碰撞反应的重要因素,碰撞在某种程度上对部分结构是有利的。更多还原

【Abstract】 Based on a reoccurring motif in the mountainous areas of the West-bridges with high piers,a fibre element model of a bridge of interest was established,followed by a detailed analysis of free vibration characteristics.Manipulation of the model enables the investigation of collisions of gap elements inserted between each set of adjacent expansion joints.Elaborate computation,comparison,and manipulation of raw data were conducted using the non-linear time history analysis methodology.Via observing the pounding responses to various seismic waves as well as the impacts of such collisions on the structure,it is evident that the spectrum characteristics of seismic waves along with the natural frequency of the modeled structure are key factors concerning its pounding responses.Furthermore,pounding could be beneficial to certain discrete components of the structure,to some extent.更多还原