深圳北坑水库取水塔交通桥地震动力响应规律及抗震安全性研究  

Seismic Response and Safety Evaluation of Traffic Bridge for Water Intake Tower at Shenzhen Beikeng Reservoir

作　　者：罗来辉 周怿阳 邹德兵 井向阳 何蕴龙[2] LUO Lai-hui;ZHOU Yi-yang;ZOU De-bing;JING Xiang-yang;HE Yun-long(Shenzhen Raw Water Co.,Ltd.,Shenzhen 518052,Guangdong Province,China;School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430072,Hubei Province,China;Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430014,Hubei Province,China)

机构地区：[1]深圳市原水有限公司,广东深圳518052 [2]武汉大学水利水电学院,湖北武汉430072 [3]长江勘测规划设计研究有限责任公司,湖北武汉430014

出　　处：《中国农村水利水电》2024年第5期61-69,共9页China Rural Water and Hydropower

摘　　要：取水塔交通桥是水库进水建筑物的组成部分,其抗震性能对保证水库震后安全运行具有重要意义。以深圳北坑水库取水塔交通桥为研究对象,采用有限元动力分析方法开展结构地震响应分析,并对交通桥的抗震安全性进行评价。研究表明:设计地震作用下,交通桥最大横桥向地震动位移3.15 cm,各跨桥板间在地震过程中的最小距离2.97 cm,地震过程中不会发生落梁破坏,也不会发生相邻跨桥面板碰撞现象;交通桥对地震产生明显放大作用,设计地震条件下,桥面板横桥向地震加速度放大倍数最大值4.01,顺桥向加速度放大倍数最大值3.36;设计地震过程中,各桥墩排架墩柱动剪应力水平不高,不会发生墩柱剪断破坏,但桥墩柱底部外侧竖直向动拉应力值较大,桥墩排架下部横梁在顶面和底面都出现较高的动拉应力,需要配置抗震钢筋来保证桥墩排架结构的抗震安全性。The aseismic capability of the water intake tower-traffic bridge,a crucial component of the reservoir′s infrastructure,is essential for ensuring the safe operation of the reservoir after an earthquake.Taking the water intake tower-traffic bridge at Shenzhen Beikeng Reservoir as an example,its seismic response was analyzed with finite element method,and its aseismic safety was evaluated.The maximum transverse displacement of the traffic bridge is 3.15 cm,and the minimum distance between adjacent decks is 2.97 cm during the design earthquake.There is no occurrence of beam dropping or collision between adjacent bridge panels.The traffic bridge experiences significant amplification of seismic accelerations in the earthquake.The maximum amplification for the bridge deck′s transverse seismic acceleration is 4.01,and for the longitudinal direction,it is 3.36.During the design earthquake,the dynamic shear stress levels in the pier columns of the bridge are not high,indicating that column shear failure is unlikely.However,there are relatively high tensile stress values on the outer vertical side of the bottom of the pier columns.Additionally,the lower beams of the bridge piers exhibit high tensile stress on both the top and bottom surfaces.To ensure the seismic safety of the bridge pier structure,anti-seismic reinforcements are necessary at pier columns and beams.

关 键 词：取水塔交通桥 地震 动力响应 抗震安全性 

分 类 号：TV312[水利工程—水工结构工程]