中文摘要：

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.

英文摘要：

In order to improve the accuracy and efficiency of the method analysis of truss structures, a reference volume based elastic for ultimate loading capacity modulus reduction method （EMRM） was presented. The reference volume, representing the failure elements, was introduced into the EMRM. A sorting strategy of failure elements for reference volume was given in term of the magnitude of the element bearing ratio. The selection principle of reference volume was established based on the characteristics of global failure and local failure of truss structures. The identification method of reference volume was then determined through the sorting strategy and the selection principle. The ultimate loading capacity for truss structures expressed by axial loads was derived by energy principle. Numerical examples show that accurate ultimate