基于OpenSees的轻度锈蚀混凝土框架结构建模理论

受试验条件及试验周期的影响,基于有限元软件OpenSees平台对相关学科问题运用数值方法进行研究不失为一种可行的研究手段。在权衡计算成本和计算精度后,重点探讨混凝土构件力学性能在纤维层面上的描述方法,选用基于有限元柔度法理论(力或位移插值型函数)和纤维模型法建立起来的非线性梁-柱单元作为有限元分析的基本单元,通过引入零长度单元实现对内嵌纵筋与混凝土间黏结滑移的数值体现,并利用OpenSees面向对象编程和源码开放的特点,植入自定义材料以考虑在役混凝土结构诸类材料的时变特性,建立基于OpenSees的轻度锈蚀混凝土框架结构数值建模理论,并取得了理想的可靠性验证结果。

NUMERICAL MODELING THEORY FOR SLIGHTLY CORRODED RC FRAME STRUCTURE BASED ON OPENSEES PROGRAM

Affected by test condition and experiment period,it is feasible for scholars to study relevant science problems by numerical method based on finite element program OpenSees. The representation method of RC component mechanical property on fibre level was emphatically discussed by weighting the computational cost and computational accuracy,and the nonlinear beam-column element which was established from the method of finite element flexibility and fiber model was taken as basic unit for finite element analysis,then the bond-slip between reinforcement and concrete was simulated by using zero-length element. Taking advantage of object-oriented programming and open source code in OpenSees program,the time variant characteristics of existing RC structure material could be considered by embedding user-defined material,and then the numerical modeling theory which was proved to be reliable for slightly corroded RC structure was finally established.