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Finite element model application to flexural behavior of cement stabilized soil block masonry

機(jī)譯：有限元模型應(yīng)用于水泥穩(wěn)定土砌塊砌體的彎曲行為

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A finite element model for cement-stabilized soil block (CSSB) masonry members-including nonlinear stress-strain relationship-has been developed and compared with experimental results. Primarily, this model serves as a simulation tool to study various problems for a large number of stress-strain state and loading conditions of CSSB masonry elements. The model presented is characterized by several parameters experimentally ascertained through triaxial and other testing. Furthermore, these parameters allow the model to capture the elastic, plastic, and softening behavior of CSSB masonry. From a constitutive behavioral standpoint, at small strain levels, the material is approximated as linear elastic. Plastic deformation of the material is captured with a modified version of the Sandia Geomodel, which is specifically designed to replicate geological material behavior. Lastly, at localized softening failure, a damage-like constitutive model which takes into account the normal and shear traction balance on the slip-weakening surface is employed. This model includes cohesion degradation as well as friction under compression. Within the finite element framework, the Strong Discontinuity Approach is used to track localized material failure from element to element. In addition to this, a novel method for modeling interfaces in finite elements is used to replicate the behavior of brick-mortar interfaces. The two featured experiments which are simulated in this study are normal to bedjoint and parallel to bedjoint masonry setups, simplified via a plane strain approximation.
機(jī)譯：水泥穩(wěn)定土壤塊（CSSB）砌體構(gòu)件的有限元模型 - 包括非線性應(yīng)力 - 應(yīng)變關(guān)系 - 已經(jīng)開(kāi)發(fā)并與實(shí)驗(yàn)結(jié)果進(jìn)行了比較。主要是，該模型用作仿真工具，用于研究大量應(yīng)力 - 應(yīng)變狀態(tài)和CSSB砌體元素的裝載條件的各種問(wèn)題。呈現(xiàn)的模型的特征在于通過(guò)三軸和其他測(cè)試實(shí)驗(yàn)確定的幾個(gè)參數(shù)。此外，這些參數(shù)允許模型捕獲CSSB砌體的彈性，塑料和軟化行為。從組成型行為觀點(diǎn)來(lái)看，在小的應(yīng)變水平下，材料近似為線性彈性。材料的塑料變形用桑迪亞地理典的改進(jìn)版本捕獲，專門(mén)設(shè)計(jì)用于復(fù)制地質(zhì)材料行為。最后，采用局部柔軟失敗，采用了考慮到防滑表面上的正常和剪切牽引平衡的損傷等本構(gòu)型模型。該模型包括凝聚力降解以及壓縮下的摩擦。在有限元框架內(nèi)，強(qiáng)不連續(xù)性方法用于跟蹤元素到元素的局部材料故障。除此之外，使用用于在有限元中建模接口的新方法來(lái)復(fù)制磚迫鏡頭接口的行為。在本研究中模擬的兩個(gè)特色實(shí)驗(yàn)是正常的，并平行于臥室砌體設(shè)置，通過(guò)平面應(yīng)變近似簡(jiǎn)化。

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