【摘要】 该文提出了适用于推覆分析的高效非线性混凝土杆单元模型,并编制了相应的计算机程序。在截面分析中,采用对横截面外围线的线积分来得到积分结果,只需很少的积分点就能得到精确解。在杆单元分析中,采用子结构技术,用一个杆单元模拟一根柱或一根梁,提高精度的同时大大减少了结构的自由度。通过3个不同类型算例的计算分析,对比了该文程序和通用有限元软件ADINA的计算结果和计算时间,结果表明,该文提出的杆单元模型具有准确、高效的优势,所编制分析程序运行稳定,结果可靠,可应用于实际工程的非线性计算分析。更多还原

【Abstract】 An efficient nonlinear reinforced concrete bar element is proposed, which is applicable to push-over analysis. Corresponding computer program is created. In cross-section analysis, integral results are obtained by using line integral over the external line of cross-section, thus exact solutions are obtained with fewer integral points. In bar element analysis, substructure technology is used. A column or a beam is modeled as one bar element, as a result, accuracy is improved and degrees of freedom are reduced. Through the analysis of three different examples, results calculated by the proposed element and by ADINA, a general purpose finite element software, are compared. The results show that the proposed bar element has advantages of preciseness and efficiency, and can be applied to the practical engineering.更多还原