混凝土本构模型在基于分层壳建模的RC板壳极限荷载分析中的对比  

Comparative Study of Concrete Constitutive Models in the Ultimate Behavior Analysis of RC Shell Structures Based on Layered Elements

作　　者：张军锋[1] 贾继龙 徐世瑶 朱冰[1] 刘庆帅 ZHANG Junfeng;JIA Jilong;XU Shiyao;ZHU Bing;LIU Qingshuai(School of Hydraulic and Civil Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China)

机构地区：[1]郑州大学水利与土木工程学院,河南郑州450001

出　　处：《力学季刊》2022年第4期1001-1010,共10页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(51508523);河南省交通运输厅科技项目(2021J2)。

摘　　要：为明确Abaqus中混凝土弥散开裂模型(SCCM)与塑性损伤模型(CDPM)在基于分层壳单元建模的Reinforced Concrete (RC)板壳结构静力极限承载能力分析中的适用性和合理的参数取值,在对两种本构模型基本特性阐述的基础上,以两块RC板和一RC双曲冷却塔为例,分别采用两种本构并配合不同参数进行计算.结果表明:Abaqus中的弥散开裂模型和塑性损伤模型均可用于基于分层壳单元建模的RC板壳结构静力极限承载特性分析;弥散开裂模型中不同拉伸硬化参数TS值对结构的开裂荷载无影响,但对钢筋屈服和破坏极限两种状态时的荷载和位移影响较大,两者一般随TS值的增加而增大,且此影响程度还与结构形式和配筋率有关;弥散开裂模型与塑性损伤模型所得结果的差异主要表现在开裂后;弥散开裂模型取TS=10时所得结构荷载位移曲线与塑性损伤模型一致性较好,但由于塑性损伤模型的极限应变更大,其所得结构延性更好,可更好地模拟RC结构的极限承载特性,而TS=10的弥散开裂模型对部分结构无法获取钢筋屈服后的完整破坏过程,需提高TS取值才可实现.This study was initiated for identifying the applicability and the parameter determination of applying concrete constitutive models in the analysis of the static ultimate behaviors of Reinforced Concrete(RC) shell structures based on layered elements in Abaqus. The smeared crack model(SCCM) and concrete damaged plasticity model(CDPM) were employed in the simulations of two RC plates and a RC cooling tower respectively, and the main features and parameters of the two constitutive models were identified. The results show that both concrete constitutive models are applicable to the analysis of the static ultimate behaviors of RC shell structures based on the layered elements in Abaqus. The tension stiffening parameter TS in SCCM has no influence on the cracking load, but plays a crucial role for the load and displacement results under the yielding or ultimate conditions. The corresponding loads and displacements generally increase with the TS value, and are also influenced by the structure type and the reinforcement ratio. The discrepancy between the two models is mainly reflected in the post-cracking stage.SCCM with TS=10 gives the load-displacement curve close to that of the damage plasticity model. However, CDPM endows the structures with larger ductility due to its larger ultimate strain, thus can better simulate the complete ultimate behaviors of RC structures. On the other hand, SCCM with TS=10 may be unable to capture the complete structure failure process after reinforcement yielding unless a bigger TS is employed.

关 键 词：RC板壳结构 弥散开裂模型 塑性损伤模型 静力极限承载特性 

分 类 号：O3[理学—力学] TU33[建筑科学—结构工程]