摘要
局部糟朽、虫蛀在古建筑梁柱构件中普遍存在,采用数值模拟方法分析其受力性能意义重大。在连续介质力学和损伤力学框架内,建立木材的弹塑性损伤本构模型,并基于ABAQUS的用户材料开发接口UMAT进行本构模型的二次开发,通过模拟已有文献中的三点受弯木梁试验,对本构模型的正确性进行验证。通过人工预制局部开槽的方式模拟实际古建筑木结构中梁柱构件的局部糟朽和局部虫蛀,基于所开发的本构模型建立有限元模型,并通过已有试验验证模型的正确性。结果表明:所建木材的弹塑性损伤本构模型和木梁、木柱的有限元模型可较好地反映残损梁柱构件在受力过程中的非线性受力和损伤演化行为。
Local decay and insect infestation are common damage types in the flexural members of ancient buildings,such as beams and columns.It is of great significance to analyze its mechanical performance by numerical simulation.In the framework of continuum mechanics and damage mechanics,the elastic-plastic damage constitutive model of wood was established,and the corresponding constitutive subroutine was developed based on the user-defined material subroutine UMAT in ABAQUS.The correctness of the constitutive model was verified based on the three-point bending wood beam test in the existing literature.Through the artificial prefabrication of local square groove,the local decay and local insect infestation on the actual wood beams and columns were simulated equivalently.Based on the developed constitutive model,the corresponding finite element model was established,and the correctness of the model was verified by the existing tests of the research group.The results indicated that the elastic-plastic damage constitutive model of wood and the finite element model of timber beam and column can better reflect the nonlinear stress and damage evolution behavior of damaged beam and column members in the stress process.
作者
张利朋
谢启芳
吴亚杰
刘伊津
ZHANG Lipeng;XIE Qifang;WU Yajie;LIU Yijin(School of Civil Engineering, Key Lab of Structural Engineering and Earthquake Resistance, Xi'an University of Architecture and Technology, Xi'an 710055, P. R. China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2022年第2期98-106,共9页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(51878550)
陕西省自然科学基础研究计划(2021JC-44)。
关键词
古建筑木结构
残损梁柱构件
弹塑性损伤本构模型
数值模拟
非线性分析
ancient timber structure
damaged beam and column members
elastic-plastic damage constitutive model
numerical simulation
nonlinear analysis
