| 摘要: |
| 设计制作了双面直剪型陶粒轻骨料混凝土与普通混凝土叠合浇筑试块并进行剪切破坏试验，发现各组试块的最终剪切破坏面层不同程度地由两侧混凝土及初始浇筑面层共同组成.为此，给出了具有内部分层式速度间断面的剪切破坏机构模型，并选用Mises屈服条件及Coulomb剪破条件，根据塑性极限分析原理建立了2种混凝土黏结层剪切破坏强度的解析解.结果表明：陶粒轻骨料混凝土与普通混凝土叠合浇筑时，考虑浇筑结合面处理方式、浇筑间隔时间及法向力影响的最终剪切破坏遵循Mohr-Coulomb强度准则. |
| 关键词: 混凝土粘结 剪切性能 塑性极限分析 分层式速度间断 陶粒轻骨料 |
| DOI：10.3969/j.issn.1007-9629.2022.07.007 |
| 分类号:TU375 |
| 基金项目:国家自然科学基金资助项目（51878360，52178223，51778302）；宁波市自然科学基金资助项目（202003N4136）；宁波大学冲击与安全工程教育部重点实验室开放基金 |
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| Interfacial Shear Performance of Ceramsite Lightweight Aggregate and Normal Concrete Cold Joint |
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WANG Jianmin1,2, LI Pengfei1, FENG Chuxiang1, XIAO Ziqiang1, LIU Junzhe1,3
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1.School of Civil and Environmental Engineering， Ningbo University， Ningbo 315211， China;2.Key Laboratory of Impact and Safety Engineering of Ministry of Education， Ningbo University， Ningbo 315211， China;3.School of Architecture Engineering， Qingdao Agricultural University， Qingdao 266109， China
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| Abstract: |
| The composite sandwiching block of ceramsite lightweight aggregate concrete and ordinary concrete were designed， and the interfacial bonding shear strength was tested. The final shear failure surface layer was composed of the two kinds of concrete materials and the initial casting interface with different quantity. A shear failure model for the casting bonding interlayer of the lightweight aggregate concrete and ordinary concrete was proposed， in which the multi-layer velocity discontinuity was supposed. The analytical solution for the shear strength of the casting bonding interlayer was deduced based on the Mises yielding condition and Coulomb shear failure condition. The model relates the final shear failure strength to the forming， the developing of the shear failure interface and the material properties of the concrete and the initial casting interlayer. At the same time， the analytical solution clearly indicates that the final shear failure for the composite casting of lightweight aggregate concrete and ordinary concrete follows the Mohr-Coulomb strength rule considering the influence of the casting interval time， the preparing method of the casting interface and the normal force. |
| Key words: concrete bonding shear performance plastic limit analysis layered velocity discontinuity ceramsite lightweight aggregate |
