部分预应力混凝土结构的非线性分析  

Nonlinear analysis of partially prestressed RC structures

作　　者：邹翾[1] 张强[2] 周德源[2] 朱立猛[3] 

机构地区：[1]上海建桥学院,上海201319 [2]上海师范大学建筑工程学院,上海201418 [3]同济大学结构工程与防灾研究所,上海200092

出　　处：《混凝土》2008年第5期48-51,共4页Concrete

基　　金：上海师范大学科研基金(SK200746);上海高校选拔培养优秀青年教师后备人选科研专项基金(AAYQ0715)

摘　　要：部分预应力混凝土结构在使用阶段允许截面开裂,但最大裂缝宽度不能超过规定值,由于裂缝的存在,结构处于非线性工作状态。将张拉后预应力筋对结构的作用采用等效荷载法转化为等效外荷载,等效外荷载包括作用在节点处的等效节点荷载及作用在单元上的等效节间荷载,而后利用柔度法处理节间荷载的优势,即柔度法采用内力形函数联系单元的节点和单元内部,节间荷载引起的各截面荷载和变形的变化可以比刚度法更为方便的引入计算这一特点,编制了基于柔度法的非线性分析程序对一榀无黏结预应力框架进行计算。从计算得到的曲线来看,用等效荷载法模拟框架结构梁中预应力的作用,并采用柔度法进行预应力框架的非线性分析,计算结果与试验结果吻合较好。In usage period, partially prestressed RC structures will have crack, but the maximum crack width is not allowed to exceed prescribed value.Since cracks exist, the structures are in a nonlinear state.The actions of prestressed tendons are transformed into equivalent loads, including equivalent nodal loads and equivalent element loads.Flexibility methods use load shape functions to link the nodes and interior of elements, so element loads can be more easily included than stiffness methods.Based on the advantage of flexibility methods, a nonlinear analysis program is worked out to study a partially prestressed fiame test.The calculation results fit well with test results in hysteretic curve, which shows that the equivalent load methods and flexibility methods are applicable for the nonlinear analysis of partially prestressed flames.

关 键 词：部分预应力 非线性 柔度法 节间荷载 

分 类 号：TU528.571[建筑科学—建筑技术科学]