建筑结构

2022, v.52;No.576(12) 36-40+30

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基于粘性区模型的胶合木梁柱节点开裂研究
Research on cracking of glulam beam-to-column joints based on cohesive zone model

陈丽;张亚芬;
CHEN Li;ZHANG Yafen;School of Engineering, The Open University of China;

摘要(Abstract):

通过数值模拟的方法,采用粘性区模型(cohesive zone model, CZM)研究了胶合木梁柱内嵌钢板-螺栓连接节点在单调荷载作用下的力学行为和开裂位移。在CZM中,通过横纹拉伸破坏(模式Ⅰ)、顺纹剪切破坏(模式Ⅱ)和两者的混合破坏模式(模式m)三种不同的模式,模拟了胶合木梁柱节点的横纹拉伸强度和顺纹剪切强度。结果表明,当加载位移达到1.2Δ~1.6Δ(Δ=90mm)时,胶合木梁柱节点上部,在木材顺纹方向沿两排螺栓连线位置发生横纹劈裂破坏。将数值模拟结果和已有试验结果进行了对比分析,发现二者具有很好的一致性,证明CZM在模拟胶合木梁柱节点的力学行为和开裂位移方面具有很好的适用性。
The cohesive zone model(CZM) was used to study the mechanical behavior and cracking displacement of the bolted glulam beam-to-column joints with slotted-in steel plates under monotonic loading through means of numerical simulation. In the CZM, the cross-grain tensile strength and along-grain shear strength of the glulam beam-to-column joints were simulated through three different modes: cross-grain tensile failure(model Ⅰ), along-grain shear failure(model Ⅱ) and the mixed failure model of them(model m). The results show that when the loading displacement reaches 1.2Δ~1.6Δ(Δ=90 mm), the upper part of the glulam beam-to-column joints will undergo transverse splitting and failure along the line of the two rows of bolts in the direction of the glulam grain. The numerical simulation results and the existing experimental results were compared and analyzed, and it is found that the two are in good agreement, which proves that CZM has good applicability in simulating the mechanical behavior and cracking displacement of glulam beam-column joints.

关键词(KeyWords): 粘性区模型;胶合木;梁柱节点;内嵌钢板;开裂
cohesive zone model(CZM);glulam;beam-to-column joints;slotted-in steel plate;crack

Abstract:

Keywords:

基金项目(Foundation):

作者(Authors): 陈丽;张亚芬;
CHEN Li;ZHANG Yafen;School of Engineering, The Open University of China;

DOI: 10.19701/j.jzjg.20211219

参考文献(References):

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