湖南大学学报（自然科学版）2024，Vol.51Issue(5)：168-178,11.DOI:10.16339/j.cnki.hdxbzkb.2024058
考虑地震应变率效应的木材单轴受压本构模型
Uniaxial Compressive Constitutive Model for Timber Considering Seismic Strain Rate Effects
摘要
Abstract
The strain rate effect of timber should be taken into account in the detailed analysis of timber structure during earthquakes.In order to investigate the impact of seismic strain rate on the mechanical properties of timber under uniaxial compression,two types of timber,Larix and Pinus Sylvestris,were selected,and perpendicular-to-grain and parallel-to-grain specimens were designed for each type.The stress-strain relationship,failure mode,elastic modulus,and compressive strength of the timber were investigated through uniaxial compression tests under seismic strain rates of 10-3 s-1,10-2 s-1,10-1 s-1,as well as a quasi-static strain rate of 10-4 s-1.The results indicated a noticeable seismic strain rate effect on the compressive strength and elastic modulus of timber under uniaxial compression.As the seismic strain rate increased,the compressive strength of timber exhibited a more significant increase.The uniaxial compression constitutive model was established,taking into account the seismic strain rate effect.Additionally,a corresponding UMAT subroutine was programmed and integrated into the ABAQUS finite element software.The numerical simulation of timber under uniaxial compression was performed.The results exhibited a strong agreement with the experimental findings,thereby validating the accuracy of both the constitutive model and UMAT subroutine.The research findings can offer constitutive support for seismic analysis of timber structures.关键词
木材/地震应变率/单轴受压/本构模型/UMAT子程序Key words
timber/seismic strain rate/uniaxial compression/constitutive model/UMAT subroutine分类
建筑与水利引用本文复制引用
刘伊津,谢启芳,张利朋,张保壮,杨高杰..考虑地震应变率效应的木材单轴受压本构模型[J].湖南大学学报（自然科学版）,2024,51(5):168-178,11.基金项目
国家自然科学基金资助项目(52178303),National Natural Science Foundation of China(52178303) （52178303）
陕西省杰出青年科学基金资助项目(2021JC-44),Science Fund for Distinguished Young Scholars of Shaanxi Province(2021JC-44) （2021JC-44）
