超高延性混凝土加固砌体的抗弯性能试验研究与理论计算  

Experimental Study and Theoretical Calculationon Flexural Properties of Masonry Structures Strengthened by Ultra-high Ductile Concrete(UHDC)

作　　者：蒋芳明 董方园 余江滔[1,2] 王汉鹏 JIANG Fangming;DONG Fangyuan;YU Jiangtao;WANG Hanpeng(Department of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《湖南大学学报（自然科学版）》2024年第11期53-64,共12页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51978504)。

摘　　要：为提升砌体墙的抗弯性能,降低墙体平面外脆性破坏的风险,采用超高延性混凝土(Ultra-high Ductile Concrete,UHDC)面层加固砌体墙段,并开展了7个加固后墙段的四点弯曲加载试验,对比分析了各试件的破坏模式、承载力和变形能力等特性.结果表明:单面和双面UHDC面层加固改变了传统砌体墙的脆性破坏状态,加固后试件呈现延性弯曲破坏模式;UHDC面层对砌体受弯构件具有良好的约束增强作用,显著提升了抗弯承载力和变形能力;UHDC面层厚度的增加更有利于提高构件的极限承载力;受压区UHDC面层对砌体的抗弯承载力贡献小于受拉区面层.最后,提出了单面和双面UHDC面层加固砌体受弯构件的抗弯承载力计算公式,为UHDC面层加固砌体受弯构件提供了设计依据.To improve the flexural properties and reduce the risk of brittle out-of-plane failure in masonry walls,ultra-high ductile concrete(UHDC)layers were introduced to strengthen the masonry members.Four-point bending tests were carried out on seven strengthened masonry members in this study.The failure mode,bearing capacity and deformability of the specimens were comparably analyzed.The experimental results indicated that ductile failure modes were achieved in masonry specimens strengthened with single-and double-sided UHDC layers,and the strengthened specimen showed ductile bending failure modes.The UHDC layers had satisfied restraint effect on masonry flexural members,which can significantly improve their flexural capacity and deformability.The increase of the thickness of UHDC layer could effectively improve the ultimate bearing capacity.The contribution of UHDC layer in tension zone to the flexural bearing capacity was less than that of UHDC layer in compression zone.Finally,the formulas of calculating the flexural capacity of masonry flexural members strengthened with single-and double-sided UHDC layers were individually proposed,providing a design basis for masonry flexural members strengthened with UHDC.

关 键 词：超高延性混凝土 砌体结构 加固 延性 抗弯承载力 

分 类 号：TU362[建筑科学—结构工程] TU528