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Detailed micro-modeling of partially grouted reinforced masonry shear walls: extended validation and parametric study
Archives of Civil and Mechanical Engineering ( IF 4.4 ) Pub Date : 2021-05-29 , DOI: 10.1007/s43452-021-00237-z
Sebastián Calderón , Cristián Sandoval , Gabriele Milani , Oriol Arnau

Partially grouted reinforced masonry (PG-RM) shear walls have been widely used as structural elements in low- and medium-rise earthquake-resistant buildings. Nonetheless, assessing its shear strength represents a complex task mainly because the partial grouting provides a non-constant cross section, which results in heterogeneous stress–strain patterns. Consequently, refined modeling techniques are needed to reproduce local failure mechanisms taking place in these walls, which significantly influence the global response. In response to this issue, a detailed micro-modeling approach based on the finite element method was proposed in previous studies by the authors. Although the numerical strategy provided accurate results, further validation is required. Therefore, in this study, the experimental results of seven PG-RM shear walls of multi-perforated clay bricks with bed-joint reinforcement are employed as validation cases. These seven walls presented variations in five design parameters. The validated numerical model was then employed to perform a parametric study to assess the influence of the wall aspect ratio, axial pre-compression stress, and horizontal reinforcement ratio on the in-plane lateral behavior of PG-RM shear walls. The obtained results show that the three studied design parameters modified the crack patterns of the walls. Besides, increasing the axial pre-compression stress or reducing the aspect ratio resulted in higher walls’ shear strength. Additionally, decreasing the horizontal reinforcement ratio or increasing the aspect ratio generated a higher story-drift ratio at maximum lateral force. Finally, it was corroborated that the positive effect of the axial pre-compression stress on the walls’ shear strength decreases inversely proportional to the aspect ratio.



中文翻译:

部分灌浆钢筋砌体剪力墙的详细微观建模:扩展验证和参数研究

部分灌浆钢筋砌体(PG-RM)剪力墙已广泛用作中低层抗震建筑的结构构件。尽管如此,评估其剪切强度是一项复杂的任务,主要是因为局部灌浆提供了非恒定的横截面,这导致了不均匀的应力应变模式。因此,需要精细的建模技术来重现这些壁中发生的局部失效机制,这会显着影响全局响应。针对这个问题,作者在之前的研究中提出了一种基于有限元方法的详细微观建模方法。尽管数值策略提供了准确的结果,但还需要进一步验证。因此,在本研究中,7个PG-RM多孔粘土砖床缝加固剪力墙的试验结果作为验证案例。这七堵墙呈现了五个设计参数的变化。然后,使用经过验证的数值模型进行参数研究,以评估壁长宽比,轴向预压缩应力和水平配筋率对PG-RM剪力墙的面内横向性能的影响。获得的结果表明,三个研究的设计参数修改了墙体的裂缝模式。此外,增加轴向预压应力或降低纵横比会导致更高的墙体剪切强度。此外,降低水平配筋率或增加纵横比会在最大侧向力下产生更高的楼层漂移比。最后,

更新日期:2021-05-30
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