轴拉荷载下内外法兰连接屈服承载力试验研究  

Experimental study on yield capacity of inner-outer flange connections under axial tension load

作　　者：陈勇[1] 牟文鼎 郭勇 沈国辉[1] 王激扬[1] 李育涵 CHEN Yong;MOU Wending;GUO Yong;SHEN Guohui;WANG Jiyang;LI Yuhan(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;China Energy Engineering Group Zhejiang Electric Power Design Institute Co.,Ltd.,Hangzhou 310012,China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]中国能源建设集团浙江省电力设计院有限公司,浙江杭州310012

出　　处：《建筑结构学报》2023年第6期199-211,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(51878607,51838012,52178511);中能建集团规划设计有限公司科技项目(GSKJ2-T06-2019)。

摘　　要：为研究超高钢管输电塔内外法兰连接在轴拉作用下内外圈螺栓力的分布规律及内外法兰连接屈服承载力计算方法,对10个具有不同参数的内外法兰连接试件进行了轴向拉伸试验;利用经试验验证的有限元模型,进行了外、内圈螺栓力比值(螺栓力比值η)的参数敏感性分析;将内外法兰连接等效为弹性转动约束梁提出了力学模型和螺栓力比值的理论计算式。试验结果表明:内圈和外圈的螺栓力并不相等,法兰连接屈服承载力小于内外圈螺栓屈服承载力之和;在弹性阶段,内外法兰连接的螺栓力比值保持不变;在弹塑性阶段,内圈和外圈的螺栓力随外荷载增加趋于一致。参数敏感性分析和试验结果均表明,螺栓力比值随螺距比、螺栓数量、法兰板厚度和钢管径厚比的增加而单调增加。是否考虑内外螺栓力不等所得的屈服承载力之比的最小值为0.8。螺栓力比值理论计算式很好地阐释了试验及参数敏感性分析获得的螺栓力比值随参数变化的规律,计算结果与试验和有限元结果吻合良好。由62382个内外法兰连接模型的有限元计算结果与理论结果之比的均值为1.0,变异系数为1.3%,螺栓力比值理论计算式适用于钢管径厚比为40~100的内外法兰连接。To provide calculation method for the yield capacity of the inner-outer flanges of the super-high tubular transmission towers,and to study the distribution of bolt forces of these flanges under axial tension load,ten specimens with various parameters were employed in the experimental study.Using experimentally validated finite element models,parametric sensitivity analysis with focus on the ratio of the outer bolt force to the inner bolt force was then performed.Finally,a theoretical formula for calculating the ratio was proposed,based on assumption that the innerouter flange was equivalent to a beam rotationally constrained by two springs at one end.The experimental results show that the internal tension forces of the inner bolts are not equal to those of the outer bolts,and the yield capacity of the inner-outer flange is less than the sum of the forces of the inner and the outer bolts.The inner bolt force to outer bolt force ratio of the inner-outer flange is constant in the elastic stage,whereas the inner and the outer bolt forces become close to each other in the elastoplastic stage with the increase of the external loading.Both the parametric sensitivity analysis and the experimental results indicate that the ratio increases monotonically with increasing bolt position,bolt number,diameter to thickness ratio of tube,and thickness of flange plate.Since the conventional calculation method doesn’t consider the inequality between internal bolt force and outer bolt force,the flange’s yield capacity is actually less than the yield capacity computed via the conventional method,and the ratio of the yield capacities has a minimum value of 0.8.The theoretical calculation formula for the inner bolt force to outer bolt force ratio is capable of explaining the variation of the ratio with the parameters,from which the obtained results agree well with that obtained from tests and finite element analysis.An equation for predicting the yield capacity was proposed based on the analysis of the FEA results of 62382 inner-out

关 键 词：内外法兰连接 轴向拉伸 静力试验 有限元分析 受力性能 

分 类 号：TU391[建筑科学—结构工程] TU318