二维温度梯度效应下的曲线梁桥支座设计  

2D temperature gradient effect on support design of curved continuous bridges

作　　者：刘梦莹[1] 徐岳[1] 单巍巍[1,2] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]江苏省交通规划设计院股份有限公司,江苏南京210014

出　　处：《江苏大学学报（自然科学版）》2015年第6期722-727,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：国家留学基金委基金资助项目(201406560024)

摘　　要：以现有连续梁桥横向温度梯度的研究成果为基础,结合现行的JTG D60—2004《公路桥涵设计通用规范》所规定的温度梯度,根据曲线梁桥的位置和走向,构造了3种二维温度梯度模式,并借助有限元软件ANSYS,分别研究了曲线连续梁桥在规范温度梯度和二维温度梯度作用下的受力与变形情况,通过计算结果的对比分析可知:在4种温度梯度模式作用下,梁体整体向外或向内偏移,二维温度梯度Ⅱ产生的梁体径向位移最大;探讨了二维温度梯度效应与规范温度梯度效应的特点,提出了基于二维温度梯度模式下的曲线连续梁桥全抗扭支撑体系的设计建议,中墩设固定支座,边墩设径向限位支座,其余设双向活动支座,能很好地限制二维温度梯度Ⅱ作用下梁体的径向位移,且支座径向支反力分布最为合理.Based on research results of transverse temperature gradient effect for bridges, referring to the temperature gradient of Chinese General Code （JTG D60--2004） , bridge location and trend, three two- dimensional temperature gradient models were constructed. Using finite element software ANSYS, the forces and the deformations of a curved girder bridge were investigated under code temperature gradient and 2D temperature gradient, respectively. The comparison of calculation results show that the overall beam body is shifted outward or inward under the four kinds of temperature gradient mode, and the radial displacement of beam is the largest under two-dimensional temperature gradient ]I. Based on the characteristics of 2D temperature gradient effect and code temperature gradient effect, the design suggestions of full torsion resistance supports for curved continuous girder bridges are proposed that mid- pier is designed with fixed support. The side pier is designed with radial limit support, and the rest piers are designed with two-way activitive support. The proposed design can limit the action of radial displacement of beam body under two-dimensional temperature gradient II , and the bearing radial force distribution is reasonable.

关 键 词：曲线连续梁桥 桥梁工程 二维温度梯度 温度梯度效应 支座布置 

分 类 号：U44[建筑科学—桥梁与隧道工程] U45[交通运输工程—道路与铁道工程]