不同模量对土坯砌体正交各向异性的影响分析

Analysis of the effect of bi-modulus on orthotropic of adobe masonry

取掺有麦秸秆的改性土坯砌体顺砖组砌等效体积单元(RVE)进行隔离体平衡受力分析,引入拉压不同模量理论,与传统拉压相同模量弹性理论计算分析得到的等效弹性模量对比。结果表明土坯砌体的正交各向异性不但与土坯砌体内部组成构件的空间受力状态有关,且在很大程度上受土坯砌体组成构件拉压不同模量的影响。土坯属于脆性材料,具备很强的不同模量性质,该理论的引入可较为准确地得到土坯砌体RVE的等效弹性模量,并在一定程度上克服了应用经典弹性力学理论数值模拟分析所得结果偏大的弱点。

Bi-modulus theory is introduced in this paper to take Representative Volume Element（ RVE） of adobe masonry mixed with wheat straw modified running bond under force balanced analysis of the isolator,and the equivalent elastic modulus is compared with the equivalent elastic modulus in analysis of traditional elasticity theory with the same tension and compression modulus. The result shows that the orthotropic of adobe masonry is not only related to space stressof internal components of masonry, but also largely related to different tension and compression Bi-modulus. Adobe belongs to brittle materials with Bi-modulus properties strongly. The equivalent elastic modulus of adobe masonry RVE can be obtained more accurately by the introduction of the theory,and the bigger weaknesses of results can be overcome to some extent by simulation analysis in the use of classical elastic mechanics theory.