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考虑地震应变率效应的木材单轴受压本构模型
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Uniaxial Compressive Constitutive Model for Timber Considering Seismic Strain Rate Effects
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    地震作用下木结构的精细化分析应考虑木材的应变率效应.为确定地震应变率对木材单轴受压力学性能的影响,选取落叶松和樟子松两种木材,分别设计了横纹试件与顺纹试件,通过其在地震应变率10-3 s-1、10-2 s-1、10-1 s-1和准静态应变率10-4 s-1作用下的单轴受压试验,研究了木材应力-应变关系、破坏模式、弹性模量、抗压强度等的变化规律.结果表明:木材抗压强度、弹性模量的单轴受压地震应变率效应明显;随着地震应变率水平的增大,木材抗压强度提高更为显著.进一步建立了考虑地震应变率效应的木材单轴受压本构模型,编写了相应的UMAT子程序,并将其嵌入ABAQUS有限元软件中.在此基础上,对木材进行了单轴受压数值模拟,模拟结果与试验结果吻合较好,验证了本构模型、UMAT子程序的正确性.研究成果可为木结构的抗震分析提供本构支持.

    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.

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LIU Yijin, XIE Qifang?,ZHANG Lipeng, ZHANG Baozhuang, YANG Gaojie.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,(5):168~178

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  • 在线发布日期: 2024-05-30
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