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为提高桁架结构极限承载力分析的计算效率和精度,建立了一种基于基准体的弹性模量缩减法.在弹性模量缩减法基础上引入了代表失效模式的基准体概念,提出了以单元承载比大小为依据的基准体失效排序策略,并考虑桁架整体破坏和局部破坏极限状态时的失效模式特性,提出了基准体失效构件选取原则,建立了桁架基准体的识别方法;同时根据功能互等原理推导了用轴力表达的极限承载力计算方法,进而考虑基准体的影响,建立了桁架结构极限承载力分析的弹性模量缩减法.算例分析表明,本文方法具有良好的计算精度和效率.
In order to improve the computational efficiency and accuracy of the analysis of the ultimate bearing capacity of truss structure, a method of elastic modulus reduction based on reference body was established.A concept of reference body representing failure mode was introduced on the basis of elastic modulus reduction method, Bearing capacity ratio based on the size of the failure strategy based on the failure mode and considering the failure mode characteristics of the total failure of the truss and the failure mode characteristics of the local failure criterion proposed benchmark selection principle of failure components to establish a truss reference body identification method; And other principles to derive the method of calculating the ultimate bearing capacity expressed by the axial force, and then taking the influence of the reference body into account, the elastic modulus reduction method of the ultimate bearing capacity of the truss structure is established.The example shows that this method has good calculation accuracy and effectiveness.