摘要
高延性混凝土(HDC)具有高强度、高延性和裂缝多重开展等特性,在砌体结构的加固应用中具有广泛的前景。文中对5个震损弱粘结古旧砌体试件采用HDC构造带面层加固,通过低周反复荷载试验,分析其破坏形态及抗震性能。试验结果表明:(1)HDC构造带面层对震损砌体结构形成良好的约束作用,有效抑制了砌体结构的开裂和破坏;(2)HDC构造带面层对震损弱粘结古旧砌体结构的承载力、延性、耗能能力和变形能力均有较大幅度的提高,改善原结构脆性破坏特性;(3)面层宽度、砌筑砂浆强度、开洞口数量等均对古旧砌体结构的延性、峰值荷载、耗能能力等抗震性能均有显著影响。基于试验破坏特征,提出2种不同模型的抗剪承载力计算方法。文中加固方法可为古旧砌体结构加固提供相应的理论依据。
High ductile concrete(HDC)is a kind of material that has the characteristics of high strength,high ductility and multiple crack development. It has a wide prospect in the application of masonry structure reinforcement.In this paper,five weekly bonded ancient masonry specimens with seismic damage are strengthened by HDC structural belt. Through low-cyclic reversed loading test,their failure modes and seismic performance are analyzed. The research shows that:(1)HDC structural belt surface course forms a constraint effect to effectively restrain the cracking and damage of the masonry structure;(2)The bearing capacity,ductility,energy dissipation and deformation capacity of the weakly bonded ancient masonry structure with seismic damage are greatly enhanced by HDC structural belt surface,which improves the brittle failure characteristics of the original structure;(3)The breadth of structural belt,the strength of the masonry mortar and the number of openings of the test specimen all have significant impact on the seismic performance of the masonry structure such as ductility,peak load,and energy dissipation capacity. Based on the failure pattern of test,calculation methods of shear capacity were proposed by 2different models. The reinforcement method adopted in this paper can provide the corresponding theoretical basis for the reinforcement of ancient masonry structure.
作者
寇佳亮
马铭
孙国兴
高兑现
周恒
KOU Jialiang;MA Ming;SUN Guoxing;GAO Duixian;ZHOU Heng(School of Civil Engineering,Xi'an University of Technology,Xi'an 710048,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China;Northwest Engineering Corporation Limited,Power China,Xi'an 710065,China)
出处
《自然灾害学报》
CSCD
北大核心
2022年第6期142-152,共11页
Journal of Natural Disasters
基金
国家自然科学基金项目(52079109,51408487,51778527)
陕西自然科学基础研究计划项目(2020JM-454)。
关键词
高延性混凝土
震损弱粘结古旧砌体
抗震性能
耗能能力
变形能力
high ductile concrete(HDC)
seismic damage and weakly bonded ancient masonry
seismic behavior
energy dissipation capacity
deformation capacity
