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为实现整体壁板压弯成形中筋条失稳的预测,以典型截面形状的I型筋条试件压弯失稳为例,对筋条边界条件作不同假设,建立3个不同的筋条失稳模型。基于能量法、弹塑性力学和数值解析,计算3个筋条失稳模型的临界失稳载荷,并与试验结果对比,确定最佳的筋条失稳模型。结果表明,视筋条对边为简支约束、底部为固支约束的失稳模型,其求得的失稳临界载荷与试验结果吻合较好。该失稳模型可以对高筋整体壁板压弯成形中的筋条失稳进行合理的预测。
In order to predict the instability of ribs in the whole bending process of the wall panel, the buckling instability of the I-section bars with typical cross-section is taken as an example to make different assumptions on the boundary conditions of the bars, and three different rib failures Steady model. Based on the energy method, the elasto-plasticity mechanics and the numerical analysis, the critical buckling loads of the three tendon instability models are calculated and compared with the test results to determine the optimal buckling instability model. The results show that the opposite sides of stiffeners are simple constraint and the bottom is the buckling model with buckling constraints. The critical instability load obtained by this method agrees well with the experimental results. The instability model can reasonably predict the instability of tendons in the bending process of high-strength whole wall panels.