摘要
建筑抗震设计规范规定楼梯间和人流通道的填充墙应采用钢丝网砂浆面层增强,为探索低成本增强方式,针对蒸压加气混凝土(AAC)墙体,设计四种面层增强方式,分别是水泥砂浆单层钢丝网增强、水泥砂浆双层玻璃纤维网布增强、粉煤灰砂浆单层玻璃纤维网布增强和粉煤灰砂浆双层玻璃纤维网布增强。对墙体进行低周反复荷载试验,对比研究不同面层增强墙体的破坏特征、抗剪承载力、极限位移和滞回特征等抗震性能。结果表明:粉煤灰砂浆面层的抗开裂能力高于普通砂浆面层的抗开裂能力;玻璃纤维网布增强与钢丝网增强对墙体抗剪承载力的提升作用基本一致,工程中可采用玻璃纤维网布替代钢丝网;通过试验结果对既有砌体结构面层加固公式进行了适用性评估。
Four surface reinforced autoclaved aerated concrete(AAC)walls were designed to explore low-cost reinforcement on AAC wall,as the seismic design of building code of China calls surface reinforcement with steel mesh mortar surface must be performed on infilled walls of stairwells and hallways.The four reinforcements are cement mortar with single-layer steel wire mesh,cement mortar with double-layer glass fiber mesh,fly ash mortar with single-and double-layer glass fiber mesh.Low-cycle loads were performed on the four surface-reinforced walls,and their seismic performance,e.g.,failure characteristic,shear resistance,peak displacement and hysteresis characteristic,were comparatively evaluated.The results show that the crack resistance of the fly ash mortar surface is better than that of the normal mortar.The glass fiber mesh can replace the steel mesh to reinforce the AAC walls in constructions,as they have identical strengthened effects on their shear resistances.Applicability assessment is conducted on the formulas of the existing masonry surface reinforcements based on the experimental data.
作者
杜红凯
籍嘉浩
曾德民
赵洪涛
DU Hongkai;JI Jiahao;ZENG Demin;ZHAO Hongtao(Beijing Advanced Innovation Center for Future Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Earthquake and Disaster Prevention Office of Qinhuangdao People’s Government,Qinhuangdao 066000,China)
出处
《结构工程师》
2021年第6期122-128,共7页
Structural Engineers
关键词
蒸压加气混凝土砌块
增强
玻璃纤维网布
钢丝网
抗剪承载力
autoclaved aerated concrete block
reinforcement
glass fiber mesh
steel wire mesh
shearresistance
