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基于粘性區(qū)模型的膠合木梁柱節(jié)點開裂研究
陳 麗, 張亞芬
摘 要

(國家開放大學理工教學部, 北京 100039)

摘要: 通過數(shù)值模擬的方法,采用粘性區(qū)模型( cohesive zone model,CZM)研究了膠合木梁柱內(nèi)嵌鋼板?螺栓連接節(jié)點在單調(diào)荷載作用下的力學行為和開裂位移。 在 CZM 中,通過橫紋拉伸破壞(模式Ⅰ)、順紋剪切破壞(模式Ⅱ)和兩者的混合破壞模式(模式 m)三種不同的模式,模擬了膠合木梁柱節(jié)點的橫紋拉伸強度和順紋剪切強度。 結(jié)果表明,當加載位移達到 1?? 2Δ~ 1?? 6Δ(Δ= 90mm)時,膠合木梁柱節(jié)點上部,在木材順紋方向沿兩排螺栓連線位置發(fā)生橫紋劈裂破壞。 將數(shù)值模擬結(jié)果和已有試驗結(jié)果進行了對比分析,發(fā)現(xiàn)二者具有很好的一致性,證明 CZM 在模擬膠合木梁柱節(jié)點的力學行為和開裂位移方面具有很好的適用性。

關(guān)鍵詞: 粘性區(qū)模型; 膠合木; 梁柱節(jié)點; 內(nèi)嵌鋼板; 開裂

中圖分類號:TU366?? 3     文獻標志碼:A     文章編號:1002?848X(2022)12?0036?05

 

DOI:10. 19701 / j. jzjg. 20211219

 

Research on cracking of glulam beam?to?column joints based on cohesive zone model

CHEN Li, ZHANG Yafen

(School of Engineering, The Open University of China, Beijing 100039, China)

Abstract: 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.

Keywords:cohesive zone model (CZM); glulam; beam?to?column joints; slotted?in steel plate; crack

第一作者:陳麗,碩士,講師,主要從事結(jié)構(gòu)安全評價研究,Email:chenl@ ouchn.edu.cn。
 
[引用本文] 陳麗,張亞芬. 基于粘性區(qū)模型的膠合木梁柱節(jié)點開裂研究[ J]. 建筑結(jié)構(gòu),2022,52(12):36?40,30.CHEN Li,ZHANG Yafen. Research on cracking of glulam beam?to?column joints based on cohesive zone model [ J].Building Structure,2022,52(12):36?40,30.
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