基于塑性损伤本构的七层混凝土剪力墙结构动力时程分析

Dynamic Time History Analysis of a Seven Storey Concrete Shear Wall Model Structure Based on Plastic Damage Model

混凝土材料是一类典型的准脆性材料,其力学行为介于弹性与脆性材料之间。为表征其力学特性,在连续介质力学的框架内,人们发展了混凝土损伤力学的分支。简言之,混凝土损伤表征的是材料细微观裂纹的萌生、发展与聚合效应在宏观上的综合现象。不同于断裂力学,损伤的存在并未打破连续介质力学的连续性假定,针对工程问题,则可以通过损伤力学结合有限元方法对混凝土结构进行模拟。结合混凝土材料塑性损伤本构模型与三维壳单元,本研究开展了一个7层足尺混凝土剪力墙结构的动力时程分析,并与实验结果和其他研究者的分析结果进行了对比,考察了混凝土剪力墙结构的抗震性能,并验证了模型的有效性。

As a typical quasi-brittle material,the mechanical behavior of concrete is between elastic material and brittle material.The concrete damage mechanics is thereby developed in the framework of continuum mechanics to characterize the mechanical behavior of concrete material.To simplify,the damage in concrete is a macro scale synthetical representation of the generation,development and gathering of the cracks and flaws on micro scale or meso scale.Different from fracture mechanics,the damage mechanics still follows the continuity assumption,therefore it is suitable to solve the response of concrete structures in the framework of finite element method.Based on the concrete plastic damage model(concrete damaged plasticity model)and 3-dimensional shell element,the dynamic time history analysis of NEES 7 storey concrete shear wall model structure is conducted in this study.By comparison with the test result and the simulation results from other researchers,the simulation in this paper is verified to be of good accuracy.