斜拉桥H形截面混凝土桥塔短期温度特性  

Short-Term Temperature Characteristics of H-Shaped Section Concrete Pylon of Cable-Stayed Bridge

作　　者：代璞[1] 钱永久[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2014年第1期59-65,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(50978221)

摘　　要：为探讨温度荷载对实心混凝土桥塔的影响,基于传热学基本原理,提出了以周期加载确定初始条件和按表面热平衡确定边界条件的计算方法.以某桥为例,用间接热应力耦合有限元法分析了H形截面混凝土桥塔的短期温度特性,获得了其温度场和温度应力的分布特点.分析结果表明,在最不利短期温度荷载作用下,H形截面混凝土桥塔表面有出现温度裂缝的可能,设计时应予以重视.In order to research the effects of temperature load acting on solid concrete pylon, a calculation method was put forward based on the fundamental principles of the heat transfer theory. In this method, initial conditions are determined by means of applying periodic load, and boundary conditions are ascertained from the thermal equilibrium on the surface. By taking a certain bridge as an example, the short-term temperature characteristics of H-shaped section concrete pylon were analyzed by using indirect temperature-stress coupling finite element method, and the distribution features of temperature field and thermal stress were obtained. The analysis result indicates that under the most unfavorable short-term temperature load, temperature cracks may appear on the surface of H-shaped section concrete pylon, so a special attention should be paid to design

关 键 词：斜拉桥 温度应力 温度场 传热学 初始条件 边界条件 热应力耦合法 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]