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首页> 外文期刊>Engineering Structures >In-plane seismic behavior of autoclaved aerated concrete block masonry walls retrofitted with high ductile fiber-reinforced concrete
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In-plane seismic behavior of autoclaved aerated concrete block masonry walls retrofitted with high ductile fiber-reinforced concrete

机译：具有高压灭菌的混凝土砌块砌体砌坯的平面地震行为，用高韧性纤维钢筋混凝土改装

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摘要

Owing to the absence of confined columns, unreinforced masonry (URM) walls are seismically vulnerable during an earthquake. Hence, this study aims to improve the seismic performances of URM walls built with autoclaved aerated concrete (AAC) blocks through retrofitting techniques using high ductile fiber -reinforced concrete (HDC). Five one -half -scale AAC masonry walls, including a confined wall and four URM walls, were constructed and tested under an in -plane reversed cyclic loading test. The confined wall and one URM wall served as re- ference specimens, while the remaining walls were upgraded using different retrofitting configurations. The experiment showed the damage progressions, failure modes, and force -displacement diagrams of the test walls, from which the seismic responses could be evaluated based on the shear strength, displacement ductility, energy dissipation, and cyclic stiffness degradation. The test results indicate that the proposed retrofitting techniques could increase the shear strength and energy dissipation of the URM wall, whereas the ductility of the HDC-strip- retrofitted specimen exhibited a negligible improvement. In terms of ultimate displacement, the results indicate that the responses of the URM walls retrofitted using a single -sided HDC layer or HDC strips with built-in steel bars were approximately consistent with those of the confined wall. The proposed formulas were used to esti- mate the ultimate lateral resistances of the test walls corresponding to different failure modes.
机译：由于缺乏狭窄的柱，在地震期间，未原始的砌体（URM）墙壁在地震上易受伤害。因此，本研究旨在通过使用高延展性纤维 - 重新加固技术改装技术改善用高压灭菌的充气混凝土（AAC）块构成的URM墙壁的地震性能。在-LANE反转的循环加载试验中构建和测试包括限制墙和四个urm墙壁的五个 - 孤立的AAC砌体砌面墙。限制墙和一个urm墙曾担任重新发育标本，而剩余的墙壁使用不同的改装配置升级。实验显示了测试壁的损伤进展，故障模式和力 - 平铺图，可以根据剪切强度，位移延性，能量耗散和循环刚度降解来评估地震响应。测试结果表明，所提出的改造技术可以提高URM壁的剪切强度和能量耗散，而HDC条带状标本的延展性表现出可忽略的改进。就终极位移而言，结果表明使用单叠HDC层或HDC条带有内置钢筋改装的URM壁的响应与限制墙的那些大致一致。所提出的公式用于估计与不同故障模式相对应的测试壁的最终横向电阻。

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