城市轨道交通大跨度连续刚构桥徐变时效分析与控制研究  

Creep Time Dependent Analysis and Control of Long Span Continuous Rigid Frame Bridge of Urban Rail Transit

作　　者：何旭辉[1] 朱立俊[1] 余志武[1] 

机构地区：[1]中南大学土木建筑学院,长沙副教授博士后410075

出　　处：《城市轨道交通研究》2009年第4期14-18,共5页Urban Mass Transit

基　　金：湖南省博士后基金资助项目(2006FJ4233)

摘　　要：混凝土徐变对预应力混凝土连续刚构桥梁长期服役下的变形及受力有非常重要的影响。推导了基于龄期调整的有效模量法的徐变轴力和徐变弯矩计算公式。以广州地铁4号线连续刚构桥沙湾大桥为工程背景,采用CEB-FIP(MC90)的徐变模型,按龄期调整的时效分析有限元法,对成桥初期到3年后该桥的徐变效应引起的桥梁变形、内力进行了计算分析,得出了连续刚构桥收缩徐变的发展变化规律;利用近3年实桥现场观测结果验证了该理论分析结果。Concrete creep seriously influences the long-term performance of the prestressed concrete continuous frame bridge. In this paper, based on the ＂age-adjusted valid modulus＂ method, a formula to calculate the axial force and the moment increment is presented. Based on the Shawan Bridge on Guangzhou metro Line 4, by using the creep model of CEB-FIP （ MC90 ） and the time dependent finite element method of age-adjusted effective modulus, the deformation and internal force within 3 years after the completion are analysed and compared with the measuring outcomes of the bridge in the past 3 years. Finally, this paper explores the law of creep deformation and the change of inner force for the continuous rigid frame bridges.

关 键 词：城市轨道交通 连续刚构桥 龄期调整的有限元法 徐变 时效分析 

分 类 号：U448.23[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]