考虑温度与时变因素耦合的混凝土桥梁增量分析方法  

Incremental analysis considering coupling temperature and time-dependent effects of concrete bridge

作　　者：林鸣[1,2] 付宏渊 颜东煌[1] LIN Ming FU Hongyuanl YAN Donghuang(School of Civil Engineering and Architecture, Changsha University of Science ＆ Technology, Changsha 410114, China Hunan Province Transport Plarming, Survey and Design Institute Co., Ltd, Changsha 410008, China)

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410114 [2]湖南省交通规划勘察设计院有限公司,湖南长沙410008

出　　处：《中南大学学报（自然科学版）》2017年第9期2506-2512,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51178059)~~

摘　　要：为了准确掌握在材料时变特性因素(如混凝土弹性模量、收缩徐变、预应力钢筋松弛等)与温度变化耦合作用下混凝土桥梁施工期及运营期结构效应变化历史,基于时间序列划分,采用增量形式的虚功平衡方程,推导考虑温度变化与材料时变因素耦合的有限元求解方程;结合具体时变函数表达,建立考虑温度耦合作用时混凝土时变弹性模量修正公式及时间增量步内一维梁单元计入时变因素影响的杆端荷载项表达式。结合实际工程,采用所提出的计算方法进行编程计算,将考虑温度耦合作用的计算结果与不考虑温度耦合作用的计算结果及实测结果进行对比分析。研究结果表明:考虑温度耦合作用的长期挠度计算结果与实测结果更接近,说明考虑温度与时变特性耦合效应的增量分析计算方法能有效提高混凝土桥梁计算分析的准确性和可靠性。In order to understand the changes of the structural effect of concrete bridge during the construction and service period, which was influenced by those time-varying factors（such as elastic modulus, shrinkage and creep of concrete and relaxation of prestressed steel bar, etc） and the coupling of temperature effect. Based on the division of time series and the incremental virtual work equilibrium equation, the finite element solution equation was derived considering the coupling of temperature variation and material time-varying factors. Combined with the specific expression of time-varying function, the formula was modificated of the time-dependent elastic modulus of concrete under the action of temperature coupling. The expression of the load at the end of the beam with the increment of one dimensional beam element in time increment step was established. Combined with the actual engineering, the proposed calculation method was programmed; the calculation results of the coupling effect of temperature and dis-coupling effect of temperature and the measured value were contrasted. The results show that the long-term deflection calculated results of temperature coupling effect are in good agreement with the measured values, which shows that the incremental analysis and calculation method considering the coupling effect of temperature and time-varying characteristics can effectively improve the accuracy and reliability of the calculation and analysis of concrete bridges.

关 键 词：桥梁工程 收缩徐变 增量分析方法 混凝土桥梁 应力松弛 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]