中外中小跨度梁桥合理搭接长度比较

Comparative Study on Seating Length of Small-Medium Span Bridge Between China and Foreign Countries

针对我国普遍采用板式橡胶支座的中小跨度梁桥,侧重阐述考虑支座的滑动对位移规律的影响。基于某两跨连续梁桥,研究不同参数时的搭接长度变化,并将各国规范计算搭接长度结果进行比较。结果表明:我国现有规范中搭接长度考虑因素简单,按规范计算搭接长度偏大;地面加速度峰值、场地类型、墩高变化对地震反应的搭接长度有重要影响;同时考虑桥梁重要性不同,搭接长度的设计也应有所差别。

According to the girder bridge supported on laminated rubber beatings widely used in China, this paper emphasizes the influence of sliding effect on seismic response. Based on a two-span continuous bridge, the paper proposes a discussion of the required seating length under different effects, such as the value of ground excitation, different ground conditions, height of piers and importance of the bridge. The results show that the recommendation of Chinese design codes for required seating length should be more specified.