柔性节点钢框架的二阶弹塑性极限承载力研究

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。

Ultimate Strength of Multistory Steel Frames with Semi-Rigid Beam-to-Column Connections

A method for analyzing the behavior of semi-rigidly connected multistory planar steel frames is presented. This method possesses the advantages of both the finite element method and the Rayleigh-Ritz method. It not only does reduce the unknowns in analysis, but also demonstrates that the behavior of connections has important effects on the stability and ultimate strength of steel frames. The degree of the effect mainly depends on the ratio of beam stiffness to joint stiffness EI/(K0l)and the maximum axial compression force ratio N/NY oi column. Baseed on the analysis of a number of numerical examples, a practical method for calculating the ultimate strength of steel frames of semi-rigid beam-to-column connections with required engineering precision is also presented in the paper.