日照下钢管混凝土哑铃形拱肋截面的温度场有限元计算  

FE calculation on temperature field in dumbbell-shaped section of CFST arch under solar radiation

作　　者：柯婷娴[1] 陈宝春[1] 刘振宇[1] 

机构地区：[1]福州大学土木工程学院,福建福州350002

出　　处：《长沙交通学院学报》2008年第4期12-17,共6页Journal of Changsha Communications University

基　　金：福建省重大科技项目(2003F007)

摘　　要：提出了考虑日照作用的钢管混凝土哑铃形拱肋截面温度场的计算方法.将日照下钢管混凝土哑铃形拱肋截面简化为由若干直平面组成,把边界上的太阳辐射作用等效为周围大气温度的升高,略去了影响较小的长波辐射热流,应用有限元程序ANSYS进行了算例计算,验证了该方法的可行性.分析结果表明:拱轴倾角会影响日照作用下各截面的温度场,但这种影响较小,工程应用中可忽略,视各截面温度场为相同,从而将拱肋的空间温度场问题简化为拱肋截面的二维温度场问题.A calculation method is put forward for the temperature field in dumbbell-shaped section of concrete filled steel tubular arch under solar radiation. In this method, dumbbell-shaped section is simplified as composed of several straight planes in calculating its solar effect, and the solar radiation on boundary is considered as increasing atmosphere temperature. The heat flux from longwave radiation is neglected because its effect is very small. A case study is carried out by this method with ANSYS software and the feasibility of the method is verified. The calculation results indicate that arch-axis inclination will affect the temperature field in the sections. However, the effect is so little that it can be omitted in application. Therefore, the temperature field in each dumbbell-shaped section of the arch rib is approximately the same, and temperature filed can be reduced from three-dimension problem to two-dimension problem.

关 键 词：钢管混凝土 日照 温度场 哑铃形 边界条件 有限元法 简化计算 

分 类 号：TU997[建筑科学—市政工程]