斜加劲梁柱节点翘曲传递分析

对梁和柱内的翘曲位移及其双力矩通过斜加劲的梁柱节点的传递提出了新的数学分析模型.新模型除了节点区内梁柱翼缘在自身平面内的弯曲变形和扭转变形外,还考虑了斜加劲肋在自身平面内的弯曲变形和扭转变形、节点区腹板对斜加劲肋扭转变形的约束,得到了节点域双力矩的计算公式.算例表明,提出的模型与板壳有限元方法结果符合非常好,而传统的梁柱翘曲连续的处理方法与板壳有限元方法结果有较大的误差.该方法可以简单地通过修改传统的薄壁杆件单元刚度矩阵来实现,并可以解决薄壁构件框架弯扭线性和非线性分析.

Analysis of warping transmission through diagonally stiffened beam-to-column joints

A new model was proposed for transmission of warping deformations and bimoments in beam and column through diagonally stiffened beam-to-column joints. Aside from the bending and torsional deformations of beam and column flanges in their own planes within the panel zone,the bending deformation and twisting of the diagonal stiffener were also considered in the proposed model and the panel zone web's restraining effect on the twist of the diagonal stiffener was taken into account.Comparison with finite element analysis using shell elements demonstrated the high accuracy of the proposed theory,while the results with traditional continuous warping assumption differ great from the finite element results.The suggested model is implemented simply through modifying the traditional thin-walled beam element matrix,and is applicable for flexural and torsional linear and nonlinear analysis of frames composed of thin-walled members.