铁路矮塔斜拉桥新型顶板锚固块结构优化  

Structure Optimization of a New Type Top-plate Anchorage of Extradosed Cable-stayed Bridge in Railway

作　　者：黄俊豪[1] 刘世忠[1] 任万敏 冯明扬 刘欣益 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁第二勘察设计院,四川成都610030

出　　处：《兰州工业学院学报》2016年第1期12-15,38,共5页Journal of Lanzhou Institute of Technology

基　　金：国家自然科学基金(51368032)

摘　　要：为确保索梁锚固区在成桥挂索前不被自身预应力束所带的预拉应力拉裂的同时,又要在桥梁投入使用后承受最不利荷载组合时保证索梁锚固区的受力安全,以金沙江上某铁路矮塔斜拉桥为实际工程背景,分别建立两个ANSYS模型,对成桥挂索前和最不利荷载组合两个不同工况进行仿真分析.按照从无到有、从少到多的顺序在锚固块中布设预应力束,进行反复多次的比选优化,得到满足工程要求的预应力束布设方案后,对预应力束布设形式进行再次优化.最后验证了该工程在采用顶板锚固块锚固形式下,索梁锚固区的结构安全性和局部抗裂性.To ensure that the cable girder anchorage zone will not be stretched to crack by its own tensile prestress before bridge is completely built, and that safety is guaranteed under the most unfavorable load combination after the bridge is put into use, this paper takes an extradosed cable-stayed bridge in railway on Jinsha river as the actual engineering example. Two different ANSYS models are established, and the two different cases are analyzed. The prestressed steel was arranged in the anchorage block from less to more, after repeated comparison and selection, when satisfied demand was got, optimized scheme was applied. It is verified that this project forms of top-plate anchorage has structural safety and resistant to cracks in local area.

关 键 词：矮塔斜拉桥 锚固块 有限元分析 索梁锚固区 优化设计 

分 类 号：U448.14[建筑科学—桥梁与隧道工程]