论文部分内容阅读
本文将有限元与Rayleigh-Ritz法相结合,建立了柔性节点钢框架的二阶弹塑性分析法。本文方法由于具有有限元与Rayleigh-Ritz法各自的优点,因而不仅有效地减少了所需求解的未知量,而且具有内存少、速度快和计算精度高等特点。对算例的分析研究表明,节点柔性将显著影响钢框架结构的稳定和极限承载力,而影响程度主要取决于梁线刚度与节点刚度系数之比EI/K_oι和柱中最大轴压比N/N_Y。经对大量算例结果的分析归纳,本文给出了考虑节点柔性的钢框架极限承载力实用计算方法,计算精度能满足工程需要。
This paper combines the finite element method with the Rayleigh-Ritz method to establish a second-order elasto-plastic analysis method for a flexible joint steel frame. This method has the advantages of finite element and Rayleigh-Ritz method, which not only effectively reduces the unknown quantity to be solved, but also has the characteristics of less memory, high speed and high computational accuracy. Analysis of studies shows that joint flexibility will significantly affect the stability and ultimate bearing capacity of the steel frame structure, and the degree of influence mainly depends on the ratio of the stiffness of the beam to the stiffness coefficient of the joint EI/K_oι and the maximum axial pressure ratio in the column N/. N_Y. After analyzing the results of a large number of examples, this paper presents a practical calculation method for the ultimate bearing capacity of steel frames considering the flexibility of joints. The calculation accuracy can meet the engineering needs.