Having orthotropic two-way bending, out-of-plane (OOP) behavior of non-structural masonry walls is one of the most challenging topics among professional engineers and researchers. This study is devoted to investigate OOP behavior of non-structural masonry walls with in-plane isolated joints to accommodate inter-story drifts. This is done using pre-validated finite element (FE) models of 99 walls with different boundary conditions (BCs), different amount of bed joint reinforcements (BJRs) and different opening details under uniform monotonic OOP pressure. Effect of vertical seismic acceleration is also investigated. Obtained results indicated that BJRs almost always increased ultimate OOP strength of the walls regardless of their BC, opening details, and level of vertical seismic acceleration. However, BJRs did not necessarily increase response modification factor of the walls. Comparing ultimate strengths from FE results with those from yielding line theory (YLT), which is adopted by some codes and guidelines, revealed that YLT is a reliable simplified technique in order to estimate OOP strength of reinforced and unreinforced non-structural masonry walls with or without openings. Both ultimate OOP strength and deformation capacities and response modification factor of the walls are decreased by increasing downward vertical seismic acceleration. This is due to the fact that downward seismic acceleration tends to reduce self-weight axial compression of the walls. From OOP pressure-deformation curves, overstrength and response modification factors of the walls are evaluated and compared with those suggested by ASCE 7. It is seen that walls with openings have significantly higher response modification factors compared with solid walls.

非结构砌体墙的正交各向异性双向弯曲，平面外（OOP）行为是专业工程师和研究人员中最具挑战性的主题之一。这项研究致力于调查具有面内隔离节的非结构砌体墙的OOP行为，以适应层间位移。这是通过在均匀单调OOP压力下使用具有不同边界条件（BC），不同数量的床缝增强件（BJR）和不同开口细节的99面墙的预先验证的有限元（FE）模型完成的。还研究了垂直地震加速度的影响。获得的结果表明，BJR几乎总是增加了墙的极限OOP强度，而不管其BC，开口细节和垂直地震加速度的水平如何。然而，BJR不一定会增加墙的响应修正因子。将有限元结果与屈服线理论（YLT）的极限强度进行比较（某些规范和准则采用了屈服线理论（YLT）），发现YLT是一种可靠的简化技术，可以估算具有或的钢筋混凝土和非钢筋非结构砌体墙的OOP强度。没有开口。通过增加向下的垂直地震加速度，可以减小墙的极限OOP强度和变形能力以及响应修正系数。这是由于以下事实：向下的地震加速度趋于减小壁的自重轴向压缩。根据OOP压力-变形曲线，评估墙体的超强度和响应修正系数，并将其与ASCE 7建议的进行比较。