预应力混凝土异形柱框架结构性能的研究

基于对现有异形柱的研究成果与有关钢筋混凝土非线性力学、预应力结构等基本理论,提出了适用于预应力混凝土异形柱框架这种新结构的非线性有限元分析方法.针对该框架柱截面不规则等特点,对框架作适当的单元划分,运用层合单元、主从系统中位移及力的偏心转化法、子结构法及静力凝聚法,得到简化计算模型.并结合逐步加载自修正法给出了对该新结构进行非线性计算分析的步骤,编制了相应的计算程序.通过给出的算例对计算结果进行了分析,并将它与已有试验成果比较,验证了该方法的有效性.

Study on structural performance of prestressed concrete frame with special-section column

Nonlinear finite analysis of a new prestressed concrete frame structure with special-section column was proposed based on studies on special-section column and fundamental theory such as nonlinear mechanics of reinforced-concrete and prestressed structure. According to the frame features such as irregular cross-section of the column, a simple calculation model was obtained with proper division of the frame into elements. Methods of substructure and static condensation were used in this model. Lamination element and eccentricity transition matrix for displacement or force in master-slave system were applied to this model. The calculating steps for the new structure's nonlinear analysis with self-modifying step-iterative method under condition of incremental loading were explained to set up corresponding calculation program, and some numerical examples were presented. The proposed method is verified compared with the experiment results.