三塔四跨单索面大翼缘矮塔斜拉桥塔墩梁固结区域局部应力分析

第14卷第7期铁道科学与工程学报Volume14Number7 2017年7月Journal of Railway Science and Engineering July2017

三塔四跨单索面大翼缘矮塔斜拉桥

塔墩梁固结区域局部应力分析

彭定成，杨孟刚，孟栋梁

(中南大学土木工程学院，湖南长沙410075)

摘要：矮塔斜拉桥塔墩梁固结区域构造、钢束布置和应力状态都十分复杂，是大跨度矮塔斜拉桥的关键受力部位。以104国道某跨径布置为(140+2×225+120)m的矮塔斜拉桥为工程背景，利用有限元分析软件ANSYS对塔墩梁固结部位进行精细的有限元局部应力分析，得到3种典型工况下的应力分布情况，验证设计的安全性和合理性，并针对大翼缘结构边缘拉应力过大的问题提出应力优化方案，对该类型矮塔斜拉桥的设计和施工具有重要的参考价值。

关键词：矮塔斜拉桥；塔墩梁固结；局部应力；大翼缘

中图分类号：U448.27文献标志码：A文章编号：1672?7029(2017)07?1465?08

Analysis on stress of pylon-pier-girder rigid region of four-span extradosed cable-stayed bridge with three pylons,single cable plane and long flange

PENG Dingcheng,YANG Menggang,MENG Dongliang

(School of civil Engineering,Central South University,Changsha410075,China)

Abstract:The pylon-pier-girder rigid region is the key component for the long span extradosed cable-stayed bridge due to its complicated configuration and stress states.With engineering background of an extradosed cable-stayed bridge in104national road of which the span arrangement is(140+2×225+120)m,the local stress of the pylon-pier-girder rigid region was analyzed and the stress distributions under three typical cases were obtained by using the finite element analysis software ANSYS.The results verify the safety and the reasonableness of the design.Further,some improvement measures were proposed for solving the serious problem of the tensile stress concentration in the end of long flange,which can give significant references for the design and construction of extradosed cable-stayed bridges of similar features.

Key words:extradosed cable-stayed bridge;the pylon-pier-girder rigid region;local stress;long flange

矮塔斜拉桥是近年来兴起并日益广泛采用的一类新型桥型。1994年，日本建成了世界上第1座矮塔斜拉桥—小田原港桥[1]。矮塔斜拉桥兼有连续梁桥和斜拉桥的特点，其造型优美，跨越能力大，施工方便，工程造价较低，在跨径为100~300m的桥型选择上具有较大优势[2?3]。矮塔斜拉桥按塔墩梁的联接方式划分主要分为3种：塔梁固结，梁底设支座；塔墩固结，塔梁分离；塔墩梁固结。其中，

收稿日期：2016?07?28

基金项目：国家自然科学基金资助项目(51378504)

通信作者：杨孟刚(1976?)，男，江西安义人，教授，博士，从事大跨度桥梁设计理论与桥梁抗震研究；E?mail：mgyang@