【摘要】 进一步完善了应力张量的线性变换方法,并将其应用于砌体材料本构模型的开发。在整体式有限元模型中,因不区分砌块和砂浆而将其视为匀质的连续材料,难以用受拉和受压两个损伤变量准确描述灰缝的II型滑移破坏。为解决这一问题,提出应再引入一个针对II型滑移破坏的损伤变量。基于以上研究工作,对砌体结构的振动台试验进行了模拟。模拟结果进一步验证了本文提出的弹塑性损伤本构模型的有效性,以及在进行结构非线性分析方面的优越性。由于本文提出的本构模型能够较为真实地描述砌体墙的破坏模式,因此使用该模型进行结构非线性分析,除了能够获取结构的位移和应力等反应外,还能较为准确地实时提供结构中的损伤分布状态信息,找出结构的薄弱部位,并据此合理地设计结构或进行相应的结构修复。更多还原

【Abstract】 In the present study,the methodology of linear transformation is improved,based on which an elasto-plastic damage model is established in order to describe the anisotropic characteristics of masonry.A shaking table test of a masonry structure is simulated.The results of simulation further prove the effectiveness of the proposed elasto-plastic model.Additionally,since the proposed constitutive model is able to describe failure modes of masonry walls quite precisely,using it in a nonlinear analysis of masonry structures can show damage distributions in the structure besides traditional structural responses such as deformations and stresses,which can provide stronger supports for design and optimization of masonry structures.更多还原