一、前言 随着我国公路建设事业的发展,对大位移量桥梁伸缩缝的要求不断提高,常用的橡胶条式、梳型板式及板式橡胶伸缩缝已不能满足大跨度公路桥梁发展的需要,急需研究开发适应我国国情的大位移桥梁伸缩缝。 目前大位移伸缩缝主要有滑板式钢板伸缩缝、梳型板式钢伸缩缝、拼板式钢伸缩缝(联邦德国Demag公司产品)以及型钢与橡胶组合式伸缩缝等几种。型钢与橡胶组合式伸缩缝是近年来常用的大位移伸缩缝,它可以根据桥梁实际伸缩量的大小任意组合,因而有广阔的 I. Introduction With the development of road construction in our country, the requirements for expansion joints of large displacement bridges are constantly increasing. The commonly used rubber strip, comb plate and rubber expansion joints have failed to meet the needs of the development of long-span highway bridges. Research and development to adapt to China’s national conditions of large displacement bridge expansion joints. At present, the major displacement expansion joints are skateboard steel expansion joints, comb steel plate expansion joints, puzzle steel expansion joints (Federal Demag products) and the combination of steel and rubber expansion joints, and several other. Steel and rubber composite expansion joint is commonly used in recent years, large displacement expansion joints, it can be based on the actual amount of expansion and contraction of the bridge any combination of size, which has a vast