摘要
钢-混凝土组合梁中栓钉剪力连接件的受力状态不同,风力机基础中栓钉剪力连接件需承受较大的上拔荷载,若顶层栓钉上覆混凝土厚度不足,极有可能发生混凝土的冲切破坏,而非预想的栓钉剪断破坏。为此,基于冲切破坏理论,建立了抗拔栓钉剪力连接件上覆混凝土厚度分析模型,提出了不同混凝土强度等级的顶层栓钉最小上覆混凝土厚度计算公式。建立了栓钉剪力连接件拔出有限元分析模型,通过与试验结果进行比对,验证了有限元分析方法的有效性。通过不断增加栓钉上覆混凝土厚度,有限元模型可依次模拟出混凝土冲切破坏到栓钉根部塑性破坏,结合理论计算结果和实际工程情况,提出了栓钉上覆混凝土最小厚度值,可供实际工程选用。
Different from the force state of the stud shear connector in the steel-concrete composite beam, the stud shear connector at the top of the wind turbine foundation needs to bear a large uplift load. If the thickness of the overlaying concrete is insufficient, the punching failure of concrete is very likely to occur. Therefore, based on the punching failure theory, an analysis model of the concrete thickness on the bolt is established, and the minimum thickness value under different concrete strength levels is proposed. The finite element analysis model of stud shear connector pull-out test was established, and the validity of the finite element method was verified by comparing with the test results. The finite element model can simulate the tensile failure of concrete to the plastic failure of the root of the bolt by increasing the thickness of the concrete on the bolt. The minimum thickness of the concrete on the bolt is proposed based on the theoretical calculation results and practical engineering conditions, which can be used for practical engineering.
作者
徐伟
吕伟荣
龙万里
赵思钛
戚菁菁
吴记东
XU Wei;LÜ Weirong;LONG Wanli;ZHAO Sitai;QI Jingjing;WU Jidong(Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期981-986,共6页
Building Structure
基金
国家自然科学基金面上项目(51578235)
湖南省研究生科研创新项目(CX20210993)
关键词
栓钉
剪力连接件
冲切破坏
受剪承载力
拔出受力数值模拟
stud
shear connector
punching failure
shear bearing capacity
numerical simulation of pull-out force
作者简介
第一作者:徐伟,硕士研究生,主要从事钢-混组合结构研究,Email:1255137478@qq.com。
