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Multi-directional response of unreinforced masonry walls: experimental and computational investigations

机译：未加固砌体墙的多向响应：实验和计算研究

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This paper describes the results of an experimental and numerical study that focused on multi-directional behavior of unreinforced masonry walls and established the requisite of the related proposed design equations. The tests were conducted following several sets of multi-directional loading combinations imposed on the top plane of the wall along with considering monotonic and cyclic quasi-static loading protocols. Various boundary conditions, representing possible wall-roof connections, were also considered for different walls to investigate the influence of rotation of the top plane of the wall on the failure modes. The results of the tests were recorded with a host of high precision data acquisition systems, showing three-dimensional displacements of a grid on the surface of the wall. Finite element models of the walls are developed using the commercial software package ABAQUS/Explicit compiled with a FORTRAN subroutine (VUMAT) written by the authors. The experimental results were then used to validate the finite element models and the developed user-defined material models. With the utility of validated models, a parametric study was performed on a set of parameters with dominant influence on the behavior of the wall system under in-plane and out-of-plane loading combinations. The experimental and numerical results are finally used to investigate the adequacy of ASCE 41 empirical equations, and some insights and recommendations are made. Copyright (C) 2016 John Wiley & Sons, Ltd.
机译：本文描述了一项针对非钢筋砌体墙的多向性行为的实验和数值研究的结果，并确定了相关拟议设计方程的必要性。测试是在考虑了单调和循环准静态加载方案的基础上，将多组多向荷载组合施加到墙顶面上进行的。对于不同的墙，还考虑了代表可能的墙-屋顶连接的各种边界条件，以研究墙的顶面旋转对破坏模式的影响。测试结果记录在大量高精度数据采集系统中，显示了墙表面网格的三维位移。墙壁的有限元模型是使用商业软件包ABAQUS / Explicit开发的，该软件包使用作者编写的FORTRAN子例程（VUMAT）进行编译。然后将实验结果用于验证有限元模型和开发的用户定义材料模型。利用经过验证的模型，对一组参数进行了参数研究，这些参数对壁内系统在平面和平面外荷载组合下的行为具有主要影响。最后将实验和数值结果用于研究ASCE 41经验方程的适用性，并提出一些见解和建议。版权所有（C）2016 John Wiley＆Sons，Ltd.

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