恒荷载效应显著结构失效模式分析的弹性模量缩减法

发布时间：2018-03-10 10:22

  本文选题：强度融合技术　切入点：恒荷载效应　出处：《土木工程学报》2016年04期 　论文类型：期刊论文

【摘要】：恒荷载效应在土木、水利等大型工程结构的分析中往往占有不可忽略的显著位置。针对传统弹塑性方法分析恒荷载效应显著结构失效模式存在的失效路径依赖性问题,结合截面强度融合技术和弹性模量调整策略,提出恒荷载效应显著结构失效元和失效模式的识别方法,进而建立恒荷载效应显著结构损伤演化和失效模式分析的弹性模量缩减法。首先将恒荷载效应融入构件的截面强度,建立强度和外荷载分布都发生改变的修正结构计算模型;然后根据齐次化广义屈服函数定义单元承载比和基准承载比,建立高承载单元识别的自适应准则;进而通过缩减高承载单元的弹性模量来模拟结构的刚度损伤,并确定结构的极限承载力;最后根据结构进入塑性极限状态时高承载单元的弹性模量缩减幅度批量标示失效元,据此确定结构的失效模式。通过算例分析,验证了该方法具有较强的稳定收敛性,能够取得较高的计算精度和效率,可以更加合理地描述结构的损伤演化过程,具有较强的适用性。
[Abstract]:The constant load effect often occupies a prominent position in the analysis of large engineering structures such as civil engineering and water conservancy. In view of the traditional elastic-plastic method, the failure path dependence of the failure mode of the structure with constant load effect is analyzed. Combined with cross-section strength fusion technique and elastic modulus adjustment strategy, a method for identifying failure elements and failure modes of structures with constant load effect is proposed. Then the elastic modulus reduction method for structural damage evolution and failure mode analysis with constant load effect is established. Firstly, the constant load effect is incorporated into the section strength of the member, and a modified structural model is established, in which both the strength and the external load distribution change. Then, according to the homogeneous generalized yield function, the adaptive criterion for identifying the high bearing element is established, and the stiffness damage of the structure is simulated by reducing the elastic modulus of the high bearing element. The ultimate bearing capacity of the structure is determined, and the failure mode of the structure is determined according to the reduction amplitude of elastic modulus of the high bearing element when the structure enters the plastic limit state, and the failure mode of the structure is determined according to the reduction amplitude of the elastic modulus of the high bearing element. It is proved that the proposed method is stable and convergent, can obtain higher calculation accuracy and efficiency, and can more reasonably describe the damage evolution process of structures.
【作者单位】： 广西大学土木建筑工程学院;广西大学工程防灾与结构安全教育部重点实验室;广西壮族自治区住房和城乡建设厅;
【基金】：国家自然科学基金(51168003,51368006,51478125) 广西自然科学基金重大项目(2012GXNSFEA053002)
【分类号】：TU317
，

本文编号：1592918