1. 同济大学 土木工程学院, 上海 200092； 2. 上海宝冶工程技术有限公司, 上海 200941
通讯作者:罗永峰，男，教授，博士生导师，电话（Tel.）:021-65980531; E-mail:yfluo93@tongji.edu.cn.作者简介:武念铎（1990-），男，辽宁省沈阳市人，博士生，主要研究方向为高强钢端板连接节点力学性能研究.基金资助:国家自然科学基金资助项目（51408150），中央高校基本科研业务费专项（2014KJ044），财政部2013年施工新技术研究与开发项目（财企（2013）235号），国家重点研发计划重点专项资助项目(2017YFB0304701)Calculation of Initial Stiffness of T-Stubs Under Consideration of Bending Stiffness of Bolts
WU Nianduo，QIANG Xuhong，LIU Xiao，LUO Yongfeng1. College of Civil Engineering, Tongji University, Shanghai 200092, China；2. Shanghai Baoye Engineering Technology Co., Ltd., Shanghai 200941, China
摘要/Abstract
摘要： 为深入了解螺栓抗弯刚度对T型连接初始抗弯刚度的影响，探讨了现阶段T型连接刚度的不同理论计算方法，并分析了不同计算方法的优缺点；在此基础上，采用连续梁模型导出了考虑螺栓抗弯刚度的T型连接初始刚度计算公式；将公式计算结果与可靠的有限元模型计算结果进行对比，验证了公式的正确性；进而对影响T型连接初始刚度的翼缘厚度和螺栓位置进行了参数分析，得到了不同参数的影响规律.研究结果表明：随着翼缘厚度的减小和螺栓轴线至翼缘边缘距离的增大，螺栓抗弯刚度对T型连接初始刚度的影响增大；对于普通钢T型连接，考虑螺栓抗弯刚度时T型连接初始刚度的计算结果较不考虑时提高的幅度不足5%；但对于高强钢T型连接，考虑螺栓抗弯刚度的计算结果较不考虑时提高约30%.因此，对于高强钢T型连接，计算其初始刚度时，不可忽略螺栓的抗弯刚度.
关键词: T型连接, 初始刚度, 螺栓抗弯刚度, 连续梁模型, 高强钢
Abstract: In order to reveal more information on initial stiffness of T-stubs, a brief introduction on calculative methods for predicting mechanical behaviors of T-stubs was firstly presented . Though comparing these methods, the continuous beam model which bending stiffness of bolts are considered was determined to calculate initial stiffness of T-stubs. Comparisons between theoretical and numerical results on initial bending stiffness of a series of T-stubs are presented and good agreements exist. Further, parametric analysis was conducted mainly on flange thicknesses and locations of bolts of T-stubs. The parametric analysis results show that with increase of flange thicknesses the distance between axis of bolts and edges of flange decreases, the influence of bending stiffness on initial stiffness of T-stubs increases. For mild steel T-stubs, when bending stiffness of bolts is considered, initial stiffness improve less than 5%. But for high strength steel (HSS) T-stubs, initial stiffness improves even more than 30%. Thus for HSS T-stubs, bending stiffness of bolts cannot be neglected when calculated initial stiffness of T-stubs.
Key words: T-stub, initial stiffness, bending stiffness of bolts, continuous beam model, high strength steel (HSS)
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