斜拉桥桥塔纵桥向振动台试验研究  

Shake Table Test of Cable-stayed Bridge Pylon Subjected to Longitudinal Ground Motions

作　　者：嵇冬冰[1] 段昕智[2] 徐艳[1] 李建中[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 [2]上海市政工程设计研究院,上海200092

出　　处：《石家庄铁道大学学报（自然科学版）》2013年第2期1-7,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(51008225)

摘　　要：为了解强震作用下我国斜拉桥桥塔的抗震性能以及震害现象,通过调研确定典型斜拉桥原型,对其H型混凝土桥塔进行纵桥向振动台试验研究。基于斜拉桥的动力特点及振型分析方法进行桥塔模型的简化设计、制作和安装,输入不同类型及不同强度的地震波,对桥塔模型进行了振动台试验。结果表明:相比一般的Elcentro波和Chichi地震波,相同加速度峰值地震输入下,场地人工波激起桥塔的地震反应最剧烈,且随着地震动输入的不断加强,桥塔下塔柱、中塔柱靠近下横梁部位先后不同程度地出现了裂缝开展延伸现象,其中塔底向上30 cm区域内损伤较明显,存在多条贯通裂缝,塔底截面最外侧钢筋屈服,模型整体刚度有明显下降趋势,但桥塔抗震性能依然表现良好。In order to understand the behavior and possible earthquake induced damages of cable-stayed bridges, based on the dynamic characteristics of the bridge, a simplified H shape pylon is designed, constructed and then tested on a shake table subjected to monotonously increased intensities of selected ground motions. Compared with the other two records, the site specific ground motion caused more severe shaking on the pylon model even at the same PGAs, and with the increase intensity of the input, the cracks induced were mainly in horizontal direction, first appearing in the bottom of the pylon, and then in lower column and middle column area near the lower strut. Especially in the area 30 cm above the column bottom, several through cracks appeared the outmost longitudinal bar yielded, and the integral stiffness of the model tended to decrease, but the p model still behaves quite good under a sequence of earthquake excitations.

关 键 词：斜拉桥 桥塔 振动台试验 抗震性能 

分 类 号：TU442.55[建筑科学—岩土工程]