论文部分内容阅读
介绍了基于广义梁理论(GBT)的梁单元的发展和应用,分析薄壁钢框架的畸变和整体后屈曲性能。首先,简要回顾了获得GBT体系非线性平衡方程的主要概念和程序,介绍了考虑框架节点性能影响的非线性梁有限元的数值实现(增量迭代法)步骤。接着,利用壳有限元模拟搜集的数据建立动态约束条件,确保连接2个非对称普通/卷边槽钢构件的框架节点的位移协调性。最后,利用所给的GBT梁单元对2个L形框架和1个对称门式刚架的后屈曲性能进行了分析,并对数值分析结果进行了讨论,验证了该方法的有效性。为了进行验证,将基于GBT的分析结果与梁/壳有限元分析软件ANSYS的分析结果进行了对比。
The development and application of beam elements based on generalized beam theory (GBT) are introduced, and the distortion and post-buckling performance of thin-walled steel frame are analyzed. First of all, the main concepts and procedures for obtaining the nonlinear equilibrium equation of GBT system are briefly reviewed. The numerical implementation of nonlinear beam finite element method (incremental iteration method) considering the influence of frame node performance is introduced. Then, the dynamic constraint conditions are established by using the data collected by the shell finite element simulation to ensure the displacement coordination of the frame nodes connecting two asymmetrical normal / curly channel steel members. Finally, the post-buckling performance of two L-shaped frames and one symmetrical portal frame with GBT beam elements given is analyzed, and numerical analysis results are discussed. The validity of the method is verified. For verification, the results of GBT-based analysis were compared with those of ANSYS, a beam / shell finite element analysis software.