盘扣式脚手架节点抗弯性能研究
Study on Flexural Performance of Disk-Lock Scaffold Joints
盘扣式脚手架节点由于具有半刚性特征,在荷载作用下呈现出明显的几何非线性特征,对结构稳定性产生不利影响。本文通过节点足尺试验与数值模拟相结合的方法对盘扣式脚手架节点的抗弯性能开展研究。首先,制作3组相同的足尺试验节点,测得了节点的抗弯刚度和抗弯极限承载力,并基于节点的荷载-位移曲线建立了盘扣式脚手架节点的三折线抗弯刚度计算模型;之后,利用ABAQUS有限元软件建立了试验节点的精细化有限元模型,通过模拟结果与试验结果的对比,验证了模型的准确性,获取了加载过程中的节点应力分布情况及破坏模式;最后,将节点的抗弯刚度引入到脚手架结构整体模型中,分析了节点抗弯刚度对结构整体稳定性的影响。研究发现,考虑节点实际抗弯刚度后脚手架整体失稳模式虽无显著变化,但结构的非线性极限承载力将下降20.84%。
The semi-rigid properties of disk-lock scaffold joints cause considerable geometric nonlinearity under load, weakening structural stability. This study employs numerical simulation and full-scale test to examine the flexural performance of these joints. First, three identical full-scale specimens were fabricated to measure the joint bending stiffness and ultimate bending capacity. Based on the load-displacement curves, a tri-linear bending stiffness calculation model was developed for the disk-lock joints. Next, a detailed finite element model of the test joints was created using ABAQUS software, and this model was validated against experimental data to determine the stress distribution and failure modes during loading. Finally, the joints' bending stiffness was integrated into an overall scaffold structural model to analyze its impact on overall structural stability. The study reveals that while considering the actual bending stiffness of the joints does not significantly alter the overall buckling mode of the scaffold, it results in a 20.84% reduction in the structural nonlinear ultimate load-bearing capacity.
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重庆市教委科学技术研究项目(KJQN202403002)
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