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（上海市建筑科學(xué)研究院有限公司上海市工程結(jié)構(gòu)安全重點(diǎn)實(shí)驗(yàn)室， 上海 200032）

［摘要］為研究結(jié)構(gòu)用集成材指接節(jié)點(diǎn)在彎矩作用下的破壞機(jī)理和損傷演化規(guī)律，設(shè)計(jì)并制作了6個(gè)指接節(jié)點(diǎn)試件，對(duì)其進(jìn)行單調(diào)加載試驗(yàn)。采用有限元軟件ABAQUS建立指接節(jié)點(diǎn)精細(xì)化有限元分析模型。通過粘聚區(qū)模型跟蹤指接節(jié)點(diǎn)區(qū)域的損傷演化過程。試驗(yàn)結(jié)果表明，指接節(jié)點(diǎn)的主要破壞模式以膠層受拉和受剪破壞為主，木材順紋受拉破壞相對(duì)有限。有限元模型對(duì)指接節(jié)點(diǎn)的初始剛度和極限承載力具有良好的預(yù)測(cè)精度，滿足工程精度要求。參數(shù)分析結(jié)果表明，木材順紋抗壓彈性模量對(duì)指接節(jié)點(diǎn)的初始剛度具有顯著影響；橫紋抗壓彈性模量對(duì)指接節(jié)點(diǎn)的初始剛度的影響并不顯著。膠層抗拉強(qiáng)度和抗剪強(qiáng)度對(duì)指接節(jié)點(diǎn)極限承載力均具有顯著影響。

［關(guān)鍵詞］結(jié)構(gòu)用集成材； 指接節(jié)點(diǎn)； 純彎試驗(yàn)； 有限元分析

中圖分類號(hào)：TU366-2，TU317-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)05-0038-06

Experimental study and numerical simulation of bending behavior of finger joints for structural glued laminated timber

Wang Mingqian

（Shanghai Key Laboratory of Engineering Structure Safety, SRIBS, Shanghai 200032, China）

Abstract:To investigate the failure mechanism and damage evolution of finger joints for structural glued laminated timber under pure bending, six finger joint specimens were carefully designed and tested under monotonic loading. A finite element method based model was developed on the basis of ABAQUS software. Cohesive zone model was adopted to trace the damage evolution of finger joints. The test results indicate that the main failure modes of finger joints are fracture and shear failure of glue. Fracture failure in longitudinal direction take place in the partial timber of the finger joints. The finite element model has good prediction accuracy for the initial stiffness and ultimate bearing capacity of finger joints, which can satisfy the engineering accuracy. Parametric study implies that the longitudinal compression elastic modulus of timber has significant influence on the initial stiffness of finger joint, while the influence of radial and tangential compression elastic modulus on the initial stiffness of finger joint is not significant. Both the tension and shear strengths of glue play an important role in the ultimate capacity of finger joint.

Keywords:structural glued laminated timber; finger joints; pure bending tests; FEM analysis

*“十三五”重大科技專項(xiàng)課題（2017YFC0702902），上海市青年科技英才揚(yáng)帆計(jì)劃項(xiàng)目（19YF1441800）。

作者簡(jiǎn)介：王明謙，博士，工程師，Email: wangmingqian@sribs.com。