外伸端板连接构造参数变化对撬力的影响

Influence of extended end-plate connection construction parameters change on prying force in extended end plate

钢结构外伸端板连接撬力对节点性能产生不利影响。外伸端板构造形式变化对撬力的影响比较复杂,故撬力准确计算比较困难。进行了外伸端板连接节点端板厚度、螺栓直径以及螺栓布置等构造参数变化对撬力的多因素影响有限元分析,并通过试验结果进行了验证。分析结果表明:端距、螺栓列横向间距以及端板厚度等构造参数变化对端板连接节点撬力产生不同程度的影响,我国现行规范(JGJ82-2011)撬力计算值与有限元结果基本一致,个别构造特殊的端板连接撬力计算值存在一定的误差。在有限元分析基础上,给出了有效减小撬力的连接构造设计建议,并对我国规范撬力计算公式进行了修正完善,修正公式计算结果与有限元计算结果取得了更好的一致性。

Extended end-plate connection prying force of steel structure has an adverse impact on joint performance. Because of the influence of different extended end plate constructions on connections performance is complicated, the prying forces are difficult to accurately calculate. In this paper, finite element models with different end -plate thicknesses, diameters of bolts and bolt arrangement were established to analysis the influence of the end plate con- struetion on prying force, and the results are validated by experiment data. The results show that the construction parameters of end distance eI ,transverse spacing of bolt arrays g and end plate thickness t have different influence on the prying forces. The prying force calculation values according to China current specification （ JGJ82 - 2011 ） coincide with the FEM results well , but there is individual inconformity. Based on the FE analysis, the construction design method which could reduce the influence of prying action effectively is suggested. And the modified calcula- tion formulas of the prying force are given, which calculation results have a good agree with those of the FEM.