预应力钢-混凝土简支组合梁变形计算的刚度增强法  

AN INCREASED STIFFNESS METHOD FOR PREDICTING THE DEFORMATION OF PRESTRESSED SIMPLY SUPPORTED STEEL-CONCRETE COMPOSITE BEAM

作　　者：聂建国[1] 温凌燕[1] 刘冬林 

机构地区：[1]清华大学土木系,北京100084 [2]新疆阿克苏蓝图公路设计公司,阿克苏843000

出　　处：《工业建筑》2003年第12期9-11,23,共4页Industrial Construction

基　　金：国家杰出青年科学基金资助项目 (5 0 0 2 5 82 2 );北京市自然科学基金资助项目 (80 0 2 0 11);北京市科委资助项目 (95 5 3 2 0 10 0 )

摘　　要：钢 -混凝土简支组合梁在预应力作用下 ,产生向上的挠曲变形 ,使其在使用荷载下的总变形减小。将预应力作用产生的反拱效应考虑为对组合梁刚度的增强 ,建立了任意荷载下适用于预应力加固梁和非加固梁的统一刚度计算公式 ,并提出了刚度增强系数的具体表达式。该公式简单明了 。The prestressing force to a simply supported steel-concrete composite beam induces an upward bending deformation,which decreases the total deformation under the working loads.An universal formula is suggested for calculating the stiffness of both the strengthening and non-strengthening prestressed composite beams under different types of loads by considering the inverted deflection as a factor of increasing the stiffness.The expression of enhancement coefficient is proposed.The formulae are simple in form and in good agreement with the test results.

关 键 词：预应力组合梁 刚度增强法 挠曲变形 荷载 简支组合梁 

分 类 号：TU398.9[建筑科学—结构工程]