摘要
为开展外界温度、荷载和预应力作用的混凝土结构数值分析,提出了一种针对预应力混凝土结构分析的单元模型。采用单独的空间杆单元模拟预应力钢筋,通过自由度变换把空间杆单元的节点自由度用实体单元节点自由度来表示,在单元网格划分时可不必考虑预应力钢筋方位,且无须固定在实体单元节点上,能直接求解预应力对结构产生的变形和内力。应用本文提出的单元信息生成技术,可方便地生成组合单元中的信息。在此基础上,编制了预应力钢筋混凝土结构分析的温度场和徐变应力场三维有限元程序。算例的对比分析表明,该程序能够有效模拟预应力混凝土结构分析在温度、荷载和预应力作用条件下的结构响应。
A new combined finite element model was proposed to analyzes the stress of pre-stressed concrete structures with multi-field load（temperatures,creep,pre-stress etc）,and independent space bar element was adopted to simulate pre-stressed bar.As a result,the position and tendency of pre-stressed reinforced was ignored through transforming method,and the degree of freedom of space solid element was used to represent that of space bar element,so node of bar element was distributed freely on surface of space solid element,and displacement and internal forces acted on structure was obtained directly.The technique of mesh generation was proposed to generate the information of combined finite element conveniently,and the procedure of 3-D finite element for pre-stressed concrete structures with multi-field load was programmed.Compared with theoretical results and experiment data,it is indicated that the model and procedure were suitable for simulating mechanical behaviors of pre-stressed concrete structures.
出处
《水利学报》
EI
CSCD
北大核心
2011年第5期616-623,共8页
Journal of Hydraulic Engineering
基金
国家863计划资助项目(2007AA11Z106)
西部交通建设科技资助项目(200631822327)
关键词
组合单元
温度场
徐变应力场
预应力混凝土
combined finite element model
temperature field
creep stress field
pre-stressed concrete
