桥梁高桩承台基础地震破坏机理试验研究  

Experimental Study on Seismic Failure Mechanism of Elevated Pile-cap Foundation for Bridge Structures

作　　者：王晓伟[1] 赫中营[1] 叶爱君[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《同济大学学报（自然科学版）》2014年第9期1313-1320,共8页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(51278375);土木工程防灾国家重点实验室基金(10 B09)

摘　　要：进行了平面布置2×3钢筋混凝土高桩承台基础模型试件在砂土中的往复荷载拟静力试验.基于推倒分析方法,对试验进行了数值分析,并揭示了试件的地震破坏机理.结果表明：试件各桩在距桩顶1倍桩径、土面以下约3～8倍桩径范围内先后形成损伤区域;边桩最先屈服,边桩桩顶截面最先达到极限曲率,对抗震设计起控制作用;桩顶的损伤特征对于桩身自由段长度不敏感,而地面以下桩身的损伤特征对自由段长度敏感.Pseudo-static testing were carried out on 2×3 elevated reinforced concrete pile-cap foundation specimens in sand. Numerical pushover analysis based on beam on nonlinear winkler foundation （BNWF） model was conducted. Results indicate that side piles yield earlier than middle piles. Each pile forms two plastic hinges at pile-top sections and under- ground pile sections with the depth of approximately 3 - 8 times of section width respectively, specimens suffer failure damage when the top section of the side pile attains to the theoretical ultimate curvature. The pile-top damage area is not sensitive to the above-ground height while the under- ground pile damage area is sensitive to the above-ground height.

关 键 词：高桩承台基础 拟静力试验 地震破坏机理 非线性Winkler地基梁模型 推倒分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]