不同界面下梁端直剪型锚栓钢板剪切承载力试验研究  

Experimental Study on Shear Capacities of Reinforced Concrete Beams Strengthened by Direct-shear-bolted Side-plates near Beam Ends Under Different Interfacial Conditions

作　　者：全学友[1,2] 罗晨 刘佳迪 黄辉辉 QUAN Xueyou;LUO Chen;LIU Jiadi;HUANG Huihui(College of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Chongqing 400045,China;Sichuan Institute of Building Research Co.,Ltd.,Chengdu 610000,China;Guangdong Architectural Design&Research Institute Co.,Ltd.,Guangzhou 510010,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [3]四川省建筑科学研究院有限公司,四川成都610000 [4]广东省建筑设计研究院有限公司,广东广州510010

出　　处：《同济大学学报（自然科学版）》2024年第1期59-67,共9页Journal of Tongji University:Natural Science

摘　　要：开展梁端直剪型锚栓钢板剪切承载力加固试验研究。试验序列包含1个对比试验段、5个剪切承载力加固试验段。试验参数包括界面条件和钢板高度。结果表明:受力过程中钢板与混凝土之间的黏结界面终会剥离,不同黏结界面不影响剪切承载力;增加钢板高度和配套的直剪型锚栓数量能有效提高混凝土梁的剪切承载力。直剪型锚栓钢板剪切承载力加固存在2种机制,约束机制通过限制斜裂缝宽度提高剪切承载力,而组合受力机制通过钢板将一部分剪力直接传入支座。加固钢板高度较小时以约束机制为主,加固钢板高度较大时,2种加固机制联合发挥作用。This paper presents a test program of shear capacities of reinforced concrete beam strengthened by direct-shear-bolted side-plates near beam ends.The test program consists of one control shear span and five shear spans strengthened in shear.Test parameters involve interfacial conditions and depth of side-plates.Test results show that all kinds of adhesion interfaces are eventually de-bonded in loading process,without affecting shear capacities whether the adhesion is weak or strong.Shear capacities are effectively improved by increasing the plate depth and the number of corresponding direct-shear bolts.There are two mechanisms in the shear strengthening of direct-shear-bolted side-plates system,i.e.,the constraint mechanism and the composite action mechanism.The constraint mechanism takes effect by constraining the development of diagonal crack width,and in the composite action mechanism the bolted side-plates directly transfer part of the shear force to the support.Steel plates with lower depth are mainly in the constraint mechanism,while steel plates with higher depth work both in the constraint mechanism and composite action mechanism.

关 键 词：结构加固 锚栓钢板加固 直剪型锚栓钢板加固 界面条件 约束机制 组合受力机制 

分 类 号：TU375.1[建筑科学—结构工程]