化学植筋后锚固抗剪承载力研究  

Research on shear bearing capacity of post-installed adhesive rebar

作　　者：郑昕晗 赵敬彪 江蒿哲 祁和涛 诸葛萍[1] ZHENG Xinhan;ZHAO Jingbiao;JIANG Haozhe;QI Hetao;ZHUGE Ping(School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo 315211,China;Ningbo Highway and Transportation Management Center,Ningbo 315100,China;IOT Technology Application Transportation Industry R&D Center(Hangzhou),Hangzhou 311106,China)

机构地区：[1]宁波大学土木工程与地理环境学院,浙江宁波315211 [2]宁波市公路与运输管理中心,浙江宁波315100 [3]物联网技术应用交通运输行业研发中心(杭州),浙江杭州311106

出　　处：《宁波大学学报（理工版）》2024年第4期110-120,共11页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：浙江省基础公益研究计划(LGF22E080023);物联网技术应用交通运输行业研发中心(杭州)开放基金(2023-01).

摘　　要：植筋锚栓在混凝土结构中得到广泛应用,作为关键的结构连接构件,其抗剪性能还有待深入研究.为获得准确的植筋锚栓抗剪承载力计算方法,共设置42个植筋锚栓承载力测试试件,考虑了植筋深度、混凝土基材强度和植筋直径这三个主要影响因素.通过剪切试验得到了各试件的抗剪承载力和剪力荷载—位移曲线,并建立了植筋锚栓四折线破坏模型,在试验基础上通过分析获得现有规范植筋锚栓抗剪承载力的修正公式.结果表明,植筋锚栓在达到钢材破坏前受压区混凝土已碎裂,即植筋抗剪承载能力在钢材破坏前已失效,因此取四折线破坏模型中的等效弹性极限点作为抗剪设计值;当混凝土抗压强度小于等于40MPa时,混凝土强度越低,锚栓抗剪承载力越小;反之,混凝土强度对抗剪承载力几乎没有影响.在相同埋深与混凝土强度条件下,锚栓直径越大其抗剪承载力越大,但增长效率却在逐渐减小.本文提出的锚栓抗剪承载力计算公式对大部分工况的计算结果与试验结果相比差值小于3%.Post-installed adhesive rebars are widely used in concrete structures.As key structural connecting components,their shear performance still needs further research.In order to obtain an accurate calculation method for the shear bearing capacity of post-installed adhesive rebar,this paper prepared a total of 42 test specimens,for which three main influencing factors were taken into account:the depth of post-installed adhesive rebar,the strength of concrete substrate,and the diameter of post-installed adhesive rebar.The shear bearing capacity and shear load versus displacement curves of each specimen were obtained through shear tests,and a four-fold line failure model for post-installed adhesive rebar was established.Based on the experimental results,a modified formula for the shear bearing capacity of existing standard post-installed adhesive rebar was obtained through theoretical analysis.The results indicate that the concrete in the compression zone of the post-installed adhesive rebar was broken before reaching the steel failure,indicating that the shear bearing capability of the post-installed adhesive rebar has failed before the steel failure.Therefore,the second turning point in the four-fold line failure model is taken as the shear design value.When the compressive strength of concrete is less than or equal to 40MPa,the lower the concrete strength,the smaller the shear bearing capacity of the post-installed adhesive rebar.On the contrary,the strength of concrete has almost no effect on the shear bearing capacity.Under the same burial depth and concrete strength conditions,the larger the diameter of the post-installed adhesive rebar,the greater its shear bearing capacity,with its growth efficiency being decreasing.For most of the working conditions,the calculation formula for the shear bearing capacity of the post-installed adhesive rebar proposed in this article exhibits less than 3%difference between the calculation results and experimental results.

关 键 词：植筋锚栓 单锚连接 抗剪承载力 静力试验 

分 类 号：TU31[建筑科学—结构工程]