次轴力对预应力混凝土框架结构承载力影响  

THE EFFECT OF SECOND AXIAL FORCE ON BEARING CAPACITY OF PRESTRESSED CONCRETE FRAME

作　　者：熊学玉[1,2] 吕品[1] 程琛[1] 李媛[1] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《工业建筑》2011年第12期8-11,共4页Industrial Construction

基　　金：国家工程建设行业标准<预应力混凝土结构设计规范>研究项目;上海市科委科技支撑计划(09231201102);国家自然科学基金(E080501);教育部高等学校博士学科点专项科研基金(20090072110051);铁道部重点课题(2010G009-K);科技部创新项目(10C26213100691)

摘　　要：结合1榀预应力混凝土框架承载力试验,采用有限元软件ABAQUS对试验框架进行模拟,模拟结果与试验结果吻合较好。在此基础上建立3组预应力框架有限元模型,通过改变边界条件进行对比分析。结果表明,次轴力的存在使截面极限抵抗弯矩减小。在不同的预应力度、配筋率、张拉控制应力和初始次轴力值的情况下,梁端形成塑性铰时次轴力值虽然较初始值有所减小,但数值仍较大,承载力计算时应考虑次轴力的影响。With a bearing capacity test on prestressed concrete frame,the frame is simulated by finite element software ABAQUS.The simulation results agree well with the test results.Based on this,three sets of finite element models are set up.By changing the boundary conditions,the analysis is carried out.The results show that the existence of the secondry force reduces the ultimate resisting moment.Under different prestress-degree,reinforcement ratio,tension control stress and initial secondry force,the secondry force is smaller than the initial force with formation of a plastic hinge in the beam end,but its value should be still large.So the effect of the secondary axial force should be considered in calculation of bearing capacity.

关 键 词：预应力 框架 次轴力 

分 类 号：TU378[建筑科学—结构工程]