【摘要】 桥梁上部结构的落梁是桥梁倒塌的主要原因之一.如果作用在结构上的地震力足以使支座破坏,则上部结构很容易从支承上脱落.防落梁系统是一种新型的减、抗震设计和加固方法,由梁搁置长度、限位装置、连梁装置等三部分组成,其主要功能是阻止梁从支承上脱落.文章综述了国内外防落梁系统中梁搁置长度、限位装置、连梁装置、梁间碰撞和缓冲装置等的研究进展,分析了各国抗震设计规范对防落梁系统的规定,同时对防落梁系统在国内的发展和应用提出了建议.更多还原

【Abstract】 The primary failure leading to collapse is identified as unseating of superstructures at the expansion joints and abutments.If seismic force on the structure is large enough to fail the bearings,then the superstructure becomes vulnerable to unseating at the supports.Collapse-proof system is a new method for seismic design and retrofitting,and the main purpose is to prevent the girders from falling off their supports.Collapse-proof systems of bridges consist of unseating prevention devices,seismic restrainers and adequate seat length.Present technologies of adequate seat length,restrainers,unseating prevention device,pounding between girders and bumper device are reviewed. The prescripts of the anti-seismic criteria for many countries are analyzed.Some suggestions on the use and research of collapse-proof systems in China are proposed.更多还原