Numerical Simulation of Bending Performance of Cross-Laminated Timber Made of Chinese Fir by Considering Rolling Shear Component

YANG Shiyu; ZHONG Yong; REN Haiqing; ZHANG Shuangbao

doi:10.12326/j.2096-9694.2026010

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Numerical Simulation of Bending Performance of Cross-Laminated Timber Made of Chinese Fir by Considering Rolling Shear Component
1.Research Institute of Wood Industry，Chinese Academy of Forestry，Beijing 100091，China
2.School of Materials Science and Technology，Beijing Forestry University，Beijing 100083，China
Vol. 40, Issue 3, Pages: 65-75(2026)
DOI： 10.12326/j.2096-9694.2026010
稿件说明：

移动端阅览

杨世玉,钟永,任海青等.考虑滚动剪切的杉木正交胶合木抗弯性能数值模拟[J].木材科学与技术,2026,40(03):65-75. DOI： 10.12326/j.2096-9694.2026010.

YANG Shiyu,ZHONG Yong,REN Haiqing,et al.Numerical Simulation of Bending Performance of Cross-Laminated Timber Made of Chinese Fir by Considering Rolling Shear Component[J].Chinese Journal of Wood Science and Technology,2026,40(03):65-75. DOI： 10.12326/j.2096-9694.2026010.

摘要

滚动剪切是正交胶合木（cross-laminated timber，CLT）受弯承载能力的关键影响因素之一，但现有数值模型常因忽略其与横纹拉伸及顺纹剪切损伤的内在耦合而难以实现精准预测。研究基于连续介质损伤力学（continuum damage mechanics，CDM）与弹塑性理论，构建考虑滚动剪切与横纹拉伸、顺纹剪切损伤耦合效应的木材三维正交各向异性本构模型（简称木材本构模型），并基于有限元ABAQUS/VUMAT平台开发的子程序实现模拟。将模拟数值与木材力学性能、3组不同结构杉木（

Cunninghamia lanceolata

）CLT足尺抗弯试验数据进行对比验证，结果表明：该模型能准确模拟木材受压时的弹塑性屈服行为及受拉、受剪时的线性软化特征，对于跨厚比为15和20的3层和5层杉木CLT，抗弯强度的模拟值与试验值的相对误差均在10%以内，且预测的宏观破坏模式与试验吻合。以跨厚比为15的3层杉木CLT为例进行损伤演化分析，发现CLT最终弯曲失效是由中间横纹层的滚动剪切先达到损伤阈值导致的，且滚动剪切损伤区域也存在横纹拉伸、顺纹剪切的损伤耦合作用，验证多损伤模式间的协同演化特征。研究建立的耦合损伤模型克服传统独立失效准则的局限，可为CLT结构精细化数值分析与安全评估提供支撑。

Abstract

Rolling shear failure is one of the critical factors limiting the bending capacity of cross-laminated timber (CLT)

however existing numerical models often fail to achieve accurate predictions due to neglecting the intrinsic coupling among rolling shear

transverse tensile

and longitudinal shear damage. A three-dimensional orthotropic constitutive model for wood was developed based on continuum damage mechanics (CDM) and elastoplastic theory

which explicitly incorporates such coupling effects among

rolling shear

transverse tensile

and longitudinal shear damage modes. The model was implemented numerically via a user-defined material subroutine (VUMAT) in the ABAQUS/Explicit platform. Validation through wood mechanical property tests and full-scale bending tests of three-configuration CLT panels made of Chinese fir (

Cunninghamia lanceolata

) demonstrated that the model developed could accurately capture the elastic plastic yield behavior of wood under compression and the linear elastic brittle fracture behavior under tension and shear. For both three-layer and five-layer CLT specimens with span-to-thickness ratios of 15 and 20

the predicted bending strengths showed relative errors within 10% compared to experimental results

and the predicted macroscopic failure modes exhibited excellent agreement with experimental observations. Furthermore

damage evolution analysis of a three-layer CLT with a span-to-thickness ratio of 15 revealed that the ultimate bending failure was governed by rolling shear damage in the central transverse layer

which first reached the critical damage threshold. The rolling shear damage zone also coincided with regions of transverse tensile and longitudinal shear damage

verifying the synergistic evolution among multiple damage modes. The proposed coupled damage model could overcome the limitations of traditional independent failure criteria and provide a reliable tool for refined numerical analysis and safety assessment of CLT structures.

关键词

Keywords

references

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