【摘要】 铅芯橡胶支座隔震的桥梁在地震作用下相邻梁体间容易产生碰撞。以3等跨连续梁桥为对象,建立了考虑隔震支座非线性的桥梁碰撞模型,通过非线性时程分析研究了纵向地震作用下相邻联梁体间的碰撞响应。计算结果表明,隔震桥梁在地震作用下更容易发生梁间碰撞,碰撞产生相当大的撞击力,使主梁的轴力响应巨幅增大,但主梁的位移及墩的剪力、位移响应增大不明显。影响碰撞响应的主要因素是相邻联的周期比和基本周期的大小、伸缩缝间隙的大小。铅芯橡胶支座在桥梁地震碰撞中能消耗碰撞能量,可以有效地减小碰撞响应,对桥梁起到一定保护作用。更多还原

【Abstract】 The adjacent girders of isolated bridge with lead rubber bearings are easy to collide with each other under earthquake excitation.A three equal spans continuous girder bridge model was created with consideration of impact element and the nonlinearity of lead rubber bearings.Nonlinear time-history analysis was used to investigate the response of the longitudinal seismic impact between girders.The calculation result shows that(1)the pounding action easily leads to significant impact forces between the girders of isolated bridge which increases the girder axial force response evidently but has little effect on the horizontal displacement of girder as well as the shear force and displacement at pier bottom;(2) the primary factors that affect the pounding response are the period ratio and the values of natural periods of adjacent bridge segments,and gap at expansion joint;(3) the lead rubber bearing has the function of dissipate the pounding energy and reduce the impact force between the adjacent girders to protect the bridge from damage.更多还原