部分预应力混凝土梁的应力和变形  

THE STRESS AND DEFORMATION OF PARTIALLY PRESTRESSED CONCRETE BEAMS

作　　者：王军文[1,2] 梁志广[1] 李建中[2] 

机构地区：[1]石家庄铁道学院结构工程研究所 [2]同济大学桥梁工程系,上海200092

出　　处：《工程力学》2002年第5期108-113,共6页Engineering Mechanics

摘　　要：本文运用有限元步进法，结合按龄期调整的有效模量法，对部分预应力混凝土梁在不同荷载阶段截面的应力和变形进行了分析探讨。分析时不仅考虑了混凝土的收缩、徐变以及预应力钢筋的松弛等因素的时效影响，而且当混凝土中所受的拉应力超过其抗拉强度时还考虑了混凝土开裂的影响。根据分析方法编制了部分预应力混凝土梁的计算分析程序，并运用该程序对某座部分预应力混凝土梁的截面应力和变形进行了详细分析。With the step-by-step finite element method and the age-adjusted effective modulus method, sectional stresses and deformations of partially prestressed concrete beam at various loading stages have been analyzed in this paper. The analysis accounts for the time-dependent effects of creep and shrinkage of concrete and relaxation of prestressed steel which includes the effects of cracking when the tensile strength of concrete is exceeded. A computer program of partially prestressed concrete beam has been developed to perform the analysis. The sectional stresses and deformations of a partially prestressed concrete beam are analyzed in detail.

关 键 词：部分预应力 混凝土梁 应力 变形 龄期 有效模量法 抗拉强度 

分 类 号：TU375.1[建筑科学—结构工程]