【摘要】 地震作用下,碰撞会显著影响桥梁的地震响应规律。现阶段碰撞效应对桥梁地震响应影响规律尚不明晰,碰撞效应参数影响分析尚不全面,特别是考虑纵坡影响的桥梁碰撞响应分析尚处空白。以某小半径带坡曲线桥为对象,设计并制作其1/10缩尺模型,设计了可调式碰撞测试装置,通过调整碰撞间隙大小,分别对发生碰撞前后的模型桥进行了振动台试验,重点探究了碰撞对有纵坡曲线梁桥主梁、桥墩地震响应的影响。结果表明:碰撞会导致曲线桥主梁的旋转效应增大,并引发梁端较大的水平加速度响应脉冲;纵坡会造成低墩处的碰撞力大于高墩处的碰撞力,并引起主梁显著的竖向动力响应;此外,碰撞会放大桥墩墩顶位移响应,增加曲线桥桥墩在地震中的破坏风险。更多还原

【Abstract】 Under seismic action, pounding can significantly affect seismic responses of bridges. At present, influence laws of pounding effect on bridges’ seismic responses are not clear, especially, the effect of longitudinal slope is not considered. Here, a 1/10 scale curved bridge model with longitudinal slope was designed and made, and an adjustable pounding test device was designed. Through adjusting pounding clearance, shaking table tests were conducted for the bridge model before and after pounding to study effects of pounding on seismic responses of the model’s girder and pier. The results showed that pounding causes the bridge girder’s rotary effect to increase and a larger horizontal acceleration response pulse at the girder end; longitudinal slope causes pounding force at lower pier to be larger than that at higher pier and the girder’s significant vertical dynamic response; pounding amplifies displacement response at pier’s top and increases failure risk of pier under seismic action.更多还原