考虑二次效应的体外预应力梁极限抗弯承载力  

Ultimate Flexural Bearing Capacity of Externally Prestressed Beams Taking into Account the Second-Order Effect

作　　者：覃荷瑛[1,2] 赵艳林[1,2] 

机构地区：[1]桂林理工大学土木与建筑工程学院,桂林541004 [2]广西大学土木建筑工程学院,南宁530004

出　　处：《结构工程师》2010年第1期18-21,共4页Structural Engineers

基　　金：广西自然科学基金项目(0447095);广西重点实验室主任基金项目(桂科能07109005-01)

摘　　要：体外预应力筋的应力和二次效应是体外预应力梁设计中的两个关键因素,采用粘性折减系数法计算体外预应力筋的应力,同时考虑二次效应的影响,通过梁截面的应力-应变关系,推导出体外预应力梁极限状态下抗弯强度的计算公式。整个计算过程简单,计算结果与实验结果吻合较好,为体外预应力梁的设计提供了参考。The stress of the external prestressing tendon and the second-order effect are the two key factors in design of externally prestressed concrete beams. In this paper, the stress of the external prestressing tendon was obtained by ＂ bond reduction coefficient＂ method taking into account the second-order effect. Then, the formulae of ultimate flexural bearing capacity were deduced through the analysis of stress-strain relationship of beam cross section. The procedure of calculation is simple. The results of calculation have good match with that acquired in the test.

关 键 词：预应力混凝土结构 体外预应力梁 预应力筋 二次效应 粘性折减系数 极限抗弯承载力 

分 类 号：TU378.2[建筑科学—结构工程]