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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Seismic behavior of a partially grouted reinforced masonry structure: Shake-table testing and numerical analyses
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Seismic behavior of a partially grouted reinforced masonry structure: Shake-table testing and numerical analyses

机译：部分灌浆加强砌体结构的地震行为：摇动表测试和数值分析

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摘要

In regions of low to moderate seismicity in North America, reinforced masonry structures are mostly partially grouted. The behavior of such structures under lateral seismic loads is complicated because of the interaction of the grouted and ungrouted masonry. As revealed in past experimental studies, the performance of partially grouted masonry (PGM) walls under in-plane cyclic lateral loading is inferior to that of fully grouted walls. However, the dynamic behavior of a PGM wall system under severe seismic loads is not well understood. In this study, a full-scale, one-story, PGM building designed for a moderate seismic zone according to current code provisions was tested on a shake table. It was shown that the structure was able to develop an adequate base shear capacity and withstand two earthquake motions that had an effective intensity of two times the maximum considered earthquake with only moderate cracking in mortar joints. However, the structure eventually failed in a brittle manner in a subsequent motion that had a slightly lower effective intensity. A detailed finite element model of the test structure has been developed and validated. The model has been used to understand the distribution of the lateral force resistance among the wall components and to evaluate the shear-strength equation given in the design code. The code equation has been found to be adequate for this structure. Furthermore, a parametric study conducted with the finite element model has shown that the introduction of a continuous bond beam right below a window opening is highly beneficial.
机译：在北美的低至中等地震性的区域中，加强砌体结构主要是部分地灌浆。由于灌浆和未加工的砌体的相互作用，这种结构在侧面载荷下的这种结构是复杂的。如过去的实验研究所述，在平面内循环横向载荷下部分灌注的砌体（PGM）壁的性能不如完全灌浆壁的性能。然而，PGM墙系统在严重地震载量下的动态行为并不了解。在这项研究中，在摇动台上测试了根据当前代码规定的适度地震区设计的全规模，一层的PGM建筑。结果表明，该结构能够开发足够的基础剪切容量，并承受两个有效强度的两倍的地震动作，最大是砂浆关节中的中等裂缝的最大抗震性。然而，该结构最终以脆性的运动以脆性的方式失败，其具有略微较低的有效强度。已经开发并验证了测试结构的详细有限元模型。该模型已被用于了解墙壁部件之间的横向力电阻的分布，并评估设计代码中给出的剪切强度方程。已发现代码方程对此结构是足够的。此外，用有限元模型进行的参数研究表明，在窗口开口下方引入连续粘合梁是高益处的。

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