Elastic modulus reduction method for analysis of failure mode of structures with significant dead load effect
Yang Lufeng1,2,3 Liu Jingmin1,2 Yu Bo2
1. School of Civil Engineering & Architecture, Guangxi University, Nanning 530004, China;
2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China;
3. Agency of Housing and Urban-Rural Development, Guangxi Autonomous Zhuang Region, Nanning 530028, China
Abstract：The dead load effect often plays an important role in the large-scale civil and hydraulic structures. To analyze the failure mode of structures with significant dead load effect, the traditional elasto-plastic methods have the failure path-dependent problem. To overcome the limitations of the traditional methods, a method of identifying the failure element and the failure mode is proposed by combining the strength incorporation technique with the strategy of elastic modulus adjustment, and then an elastic modulus reduction method is developed for analyzing the damage evolution and failure mode of engineering structures with significant dead load effect. Firstly, a modified computational model with updated strength and external load distribution is established by incorporating the dead load effect into the sectional strength of structural member. Next, based on the element bearing ratio (EBR) and the reference EBR defined by the homogeneous generalized yield function, a self-adaptive criterion of identifying the highly stressed elements (HSEs) is presented. Furthermore, by means of reducing the elastic modulus of HSEs, the structural stiffness damage is simulated, and the bearing capacity of the structure is determined. Finally, the potential failure elements can be identified and marked in terms of the reduction amplitude of elastic modulus of HSEs during the plastic limit state of structure, so that the failure mode can be determined. Based on two numerical examples, the good stability and convergence, high accuracy and efficiency of the proposed method can be validated. Since the proposed method can reasonably simulate the damage evolution of structure, it deserves wide applications.
杨绿峰 刘敬敏 余 波. 恒荷载效应显著结构失效模式分析的弹性模量缩减法[J]. 土木工程学报, 2016, 49(4): 78-87.
Yang Lufeng Liu Jingmin Yu Bo. Elastic modulus reduction method for analysis of failure mode of structures with significant dead load effect. 土木工程学报, 2016, 49(4): 78-87.
