摘要
为研究装配式钢-UHPC组合梁中群钉连接件在不同应力状态下的结构性能,开展了三组群钉连接件的推出试验和两组拉剪试验,考虑栓钉间距、高径比和拉剪比对UHPC中群钉连接件破坏形态、承载能力和延性的影响,提出UHPC中群钉连接件荷载-滑移关系表达式.结果表明,推出试验和拉剪试验的破坏模式均为栓钉被剪断.剪切荷载下,减小栓钉间距会降低群钉连接件的承载力和延性,栓钉高径比对极限承载力和相对滑移的影响较小,短栓钉在UHPC中仍能发挥其抗剪性能,建议群钉连接件中栓钉间距不小于4倍栓钉直径,UHPC板中群钉连接件采用弹性理论进行设计.拉剪荷载下,拉剪比为0.17时拉力作用对群钉连接件受力性能影响可忽略,拉剪比为0.27时拉力作用明显削弱了UHPC板中群钉连接件的承载能力和延性.提出的荷载-相对滑移关系的计算模型能够准确的描述UHPC板中群钉连接件的行为.
To study the structural properties of grouped stud connectors in prefabricated steel-UHPC composite beam under the different stress states,three series of push-out tests and two series of pull-shear tests of grouped stud connecters are carried out.Considering the effects of stud spacing,aspect ratio and tension to shear ratio on the failure mode,bearing capacity and ductility of the grouped stud connectors in UHPC,the expression of load-slip relationship of grouped stud connectors in UHPC is proposed.The results show that the failure mode of both push-out test and pull-shear test is that the stud is cut off Under the shear load,the decrement of the stud spacing will reduce the bearing capacity and ductility of grouped stud connectors The aspect ratio of stud has little influence on the ultimate bearing capacity and the relative slip The short stud can still play its shear performance in UHPC.It is recommended that the stud spacing of grouped stud connectors should not less than 4 times of stud diameter and the grouped stud connectors in UHPC can be designed based on elastic theory.When the pull-shear ratio is 0.17,the influence of tensile force on the mechanical properties of the grouped stud connectors is negligible under the pull-shear load When the pull-shear ratio is 0.27,the tensile force obviously decreases the bearing capacity and ductility of grouped stud connectors in UHPC plate.The proposed calculation model of load-relative slip relationship can accurately describe the behavior of grouped stud connectors in UHPC plates.
作者
徐辉
丁婧楠
朱劲松
孙晨然
XU Hui;DING Jingnan;ZHU Jinsong;SUN Chenran
出处
《城市道桥与防洪》
2022年第7期167-172,共6页
Urban Roads Bridges & Flood Control
基金
天津市交通运输科技发展计划项目(2019B-21)。
关键词
超高性能混凝土
栓钉连接件
剪切荷载
拉剪荷载
组合梁
ultra-high performance concrete
stud connector
shear load
pull-shear load
composite beam
