螺栓球节点力学性能研究及弯矩-转角关系式的建立  

Mechanical Properties of Bolt-Ball Joints and Establishment of Moment-Rotation Relation Formula

作　　者：喻晓晨 李会军[1] 陈旭 张晓磊 YU Xiaochen;LI Huijun;CHEN Xu;ZHANG Xiaolei(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100 China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《建筑钢结构进展》2022年第4期57-65,共9页Progress in Steel Building Structures

基　　金：国家自然科学基金(51408490);陕西省自然科学基础研究计划项目(2022JM-234);中央高校基本科研业务费专项资金(2452020168);国家级大学生创新创业训练计划项目(S202010712197)。

摘　　要：螺栓球节点常用于网架及双层网壳结构中,目前在一些小跨度、接近球形的单层网壳中也有所应用。现阶段对螺栓球节点网架及双层网壳进行分析时,通常将螺栓球节点假定为理想铰接,实际上该节点是介于刚接和铰接之间的半刚性节点。通过建立螺栓球节点的精细化模型,得到螺栓球节点的抗弯刚度及对应的弯矩-转角曲线,并利用已有试验数据验证了数值模型的合理性。研究了螺栓球节点相关参数(即螺栓直径、预紧力大小、锥尾壁厚和套筒厚度)对节点抗弯刚度的影响。研究表明:螺栓球节点的初始刚度和极限弯矩在一定范围内随螺栓预紧力的增大而提高,当螺栓预紧力达到100 kN时,其对螺栓球节点抗弯刚度的影响逐渐减弱;锥尾壁厚及套筒厚度对螺栓球节点极限弯矩的影响较大,而对节点初始刚度的影响较小;螺栓球节点的抗弯刚度随着螺栓直径的增加而增大。利用对螺栓球节点参数化分析的结果并结合节点的自身特性,基于KISHI等提出的幂函数模型,推导出了螺栓球节点弯矩-转角关系公式,该公式计算值与数值模拟的弯矩-转角曲线吻合度较高,能有效地模拟螺栓球节点弯矩-转角的关系。Bolt-ball joints are commonly used in grid structures and double-layer reticulated shells and are also extended to some small-span,approximately spherical reticulated shells.When analyzing the grid structures and double-layer reticulated shells with bolt-ball joints,the bolt-ball joint is usually assumed to be an ideal articulated joint.The joint is a semirigid joint between a rigid and articulated joint.In this paper,by establishing a refined model of the bolt-ball joint,the bending stiffness and the corresponding moment-rotation curve of the bolt-ball joint are obtained,and the experimental data verify the rationality of the numerical model;the effects of relevant parameters of the bolt-ball joint(e.g.,bolt diameter,pre-tightening force,cone tail wall thickness,and sleeve thickness)on the bend-bearing capacity of the bolt-ball joint are explored.The results of the research show that the initial stiffness and ultimate bending moment of the bolt-ball joint increase with the increase of pre-tightening force applied by the bolt in a specific range.When the bolt pre-tightening force reaches 100 kN,its influence on the bend-bearing capacity of the bolt-ball joint gradually weakens;The thickness of the cone tail and sleeve has a more significant influence on the ultimate bending moment of the bolt-ball joint but has a minor influence on the initial stiffness of the joint;the bend-bearing capacity of the bolt-ball joint increases with the increase of the bolt diameter.Based on the results of parametric analysis of the bolt-ball joint and combined with the characteristics of the joint,the power function model proposed by KISHI and CHEN is used to deduce the moment-rotation relation formula of the bolt-ball joint.The calculated value of this formula is in good agreement with the moment-rotation curve of the numerical simulation and can effectively simulate the moment-rotation relationship of the bolt-ball joint.

关 键 词：螺栓球节点 弯矩-转角曲线 抗弯刚度 弯矩-转角关系式 参数化分析 

分 类 号：TU391[建筑科学—结构工程]