外加劲加强相贯节点极限承载力研究  

Study on ultimate bearing capacity of tubular joints strengthened by external stiffening plates

作　　者：张斌[1,2] 李文适 蒙春玲 孙清 ZHANG Bin;LI Wenshi;MENG Chunling;SUN Qing(School of Human Settlements and Civil Engineering,Xi'an Jiaotong University,Xi'an 710049,China;China Energy Engineering Group Shanxi Electric Power Engineering Co.,Ltd.,Taiyuan 030001,China)

机构地区：[1]西安交通大学人居环境与建筑工程学院,陕西西安710049 [2]中国能源建设集团,山西省电力勘测设计院有限公司,山西太原030001

出　　处：《西安建筑科技大学学报(自然科学版)》2024年第6期797-807,共11页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：中国能源建设集团规划设计有限公司科技项目(GSKJ2-T06-2021);国家自然科学基金(51978570)。

摘　　要：针对特高压大跨越输电塔中广泛使用的外加劲板加强相贯节点,尚未有明确的计算方法考虑加劲对节点承载力的影响;为此,通过试验和有限元分析,研究了无加劲和外加劲板加强相贯节点的破坏模式、承载力和应变分布及塑性发展规律等力学特性.试验结果表明,采用外加劲板可以显著提高无加劲节点的承载能力和整体刚度,延缓节点破坏过程.与试验结果相比,有限元分析能较好地模拟该类节点的破坏模式和承载性能.为了评估不同参数下外加劲板对承载力提升值的影响规律,对16个无加劲节点模型和144个加劲节点模型进行了有限元分析,结果表明:外加劲板加强相贯节点承载力可以认为是对应无加劲节点承载力与外加劲板提升值之和;AIJ的建议公式可以较为准确地预测无加劲节点承载力;外加劲板提升值与支主管直径比、外加劲板宽度因子和厚度因子呈正相关,与主管径厚比呈负相关,本文采用改进的“剪切强度法”计算外加劲板提升值,并考虑了主管和支管性能的影响.There is no clear calculation method to consider the influence of stiffening on the bearing capacity of the tube joints stiffened with the external stiffening plates which are widely used in UHV long-span transmission towers.Therefore,the failure mode,bearing capacity,strain distribution and plasticity development law of tube joints with unstiffened and externally stiffening plates were studied through experiments and finite element analysis in this paper.Test results indicate that the external stiffening plates can significantly improve the bearing capacity and stiffness of the joints and postpone the joints'failure process.Compared with the tested results,the FEA could better simulate the failure modes and bearing capacity behavior of the joints.To estimate the influence of external stiffened plates on the increase of bearing capacity under different parameters,16 unstiffened joint models and 144 stiffened joint models were analyzed by finite element method.The results show that the bearing capacity of the joints strengthened by external stiffening plates can be considered as the sum of the bearing capacity of corresponding unstiffened joints and the lifting value of external stiffening plates.AIJ's suggested formula can accurately predict the bearing capacity of unstiffened joints.The lifting value of external stiffening plates is positively correlated with the diameter ratio of brace to chord,the width factor and the thickness factor of external stiffening plates,and negatively correlated with the radius-thickness ratio of chord.In this paper,the improved“shear strength method”is used to calculate the lift value of the external stiffening plates,and the influence of the performance of the chord and the brace is considered.

关 键 词：相贯节点 外加劲板 试验研究 有限元分析 极限承载力 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1