摘要
为了简化和统一结构力学教材中杆件体系计算自由度W的算法,本文提出了"直接法"。该方法以相邻节点间的杆件和结点为分析对象,对于含m根杆件、g个单刚结点和h个单铰结点的平面杆件体系,直接法给出计算自由度公式W=3m-(3g+2h)。相比于已有方法,直接法研究对象清晰,数学运算统一,适合于编程计算,便于初学者准确而快速计算复杂体系的W;也为结构超静定次数的确定提供了一种简单有效的数值算法。
This paper proposes a direct method to determine the computational degree of freedom W of bar systems in a way of simplicity and uniformity. By taking the bar between any two adjacent joints and the joints as the analysis objects, the direct method gives a formula W = 3 m-(3g + 2h) for the plane system with m bars, g single rigid joints and h single hinge joints. Compared with the previous algorithms to determine W, this method is easy to be applied and may increase the accuracy and the efficiency. It can also be used in determining the degrees of freedom of a statically indeterminate problem.
引文
1钱令希.发展中的计算结构力学.力学与实践,1979,1(1):10-13Qian Lingxi.Development of computational structural mechanics.Mechanics in Engineering,1979,1(1):10-13(in Chinese)
2龙驭球,包世华,袁驷.结构力学.北京:高等教育出版社,2012Long Yuqiu,Bao Shihua,Yuan Si.Structural Mechanics.Beijing:Higher Education Press,2012(in Chinese)
3王焕定,章梓茂,景瑞.结构力学.北京:高等教育出版社,2010Wang Huanding,Zhang Zimao,Jing Rui.Structural Mechanics.Beijing:Higher Education Press,2010(in Chinese)
4赵更新.结构力学.北京:中国水利水电出版社,知识产权出版社,2004Zhao Gengxin.Structural Mechanics.Beijing:China Water Power Press,Intellectual Property Publishing House,2004(in Chinese)
5刘尔烈.结构力学.天津:天津大学出版社,1996Liu Erlie.Structural Mechanics.Tianjing:Tianjing University Press,1996(in Chinese)
6单建,吕令毅.结构力学.南京:东南大学出版社,2011Shan Jian,LüLingyi.Structural Mechanics.Nanjing:Dongnan University Press,2011(in Chinese)
7朱伯钦,周竞欧,许哲明.结构力学.上海:同济大学出版社,2004Zhu Boqin,Zhou Jing’ou,Xu Zheming.Structural Mechanics.Shanghai:Tongji University Press,2004(in Chinese)