摘要
为了研究双金属复合管的压弯承载性能,考虑试件偏心距和长细比这两个参数,对7个液压成型的X65/316L双金属复合管试件进行了试验研究.试验内容包括材性测试、几何初始缺陷3D扫描测量和压弯承载力试验.通过对比各试件的受力过程、破坏形态及数据结果,分析试件长细比和荷载偏心距对复合管压弯承载性能的影响.试验结果表明:试件在压弯荷载作用下的破坏模式为整体失稳破坏,试件达到极限荷载后具有良好的塑性变形能力.长细比越大,试件越容易发生失稳破坏,试件的弹性变形阶段越短,刚度和承载力均显著降低;而偏心距越大,试件承载力明显下降,试件刚度则略微降低.在此基础上,基于换算截面法对复合管截面进行等效换算,然后根据《钢结构设计标准》(GB 50017—2017)中a类截面钢管的压弯失稳承载力公式计算复合管极限承载力,并将承载力试验结果与换算截面法计算值相比较.对比结果表明采用换算截面法考虑衬管的贡献计算得到的复合管压弯试件承载力与试验值吻合较好,平均误差小于10%且偏于安全.对比分析表明采用换算截面法设计双金属复合管能更好地考虑衬管的承载能力,研究成果可为此类构件在设计及相关工程的应用提供一定参考.
To study the eccentric compression bearing performance of lined pipes,considering the two parameters of member eccentricity and slenderness ratio,seven hydraulically formed X65/316L lined pipe specimens were tested.The test contents include the material property test,3D scanning measurement of initial geometric defects,and bearing capacity test.Comparing the stress process,failure mode,and data results of each specimen,the effects of the specimen slenderness ratio and load eccentricity on the eccentric compression bearing performance of lined pipes were analyzed.The test results show that the failure mode of the specimen under an eccentric load is the overall instability failure,and the specimen exhibits a good plastic deformation capacity after reaching the ultimate load.The larger the slenderness ratio,the more prone the specimen is to instability failure and the shorter the elastic deformation stage of the specimen.Additionally,the stiffness and bearing capacity are significantly reduced.The larger the eccentricity,the lower the specimen’s bearing capacity and its stiffness is slightly reduced.On this basis,a section of the lined pipe is converted by using the conversion section method,and then its ultimate bearing capacity is calculated according to the formula of the compression bending instability bearing capacity of class a section steel pipe in the standard for the design of steel structures(GB 50017—2017).The test results of the bearing capacity are compared with the calculated values of the conversion section method.The comparison results show that the bearing capacity of the lined pipe compression and bending members calculated by the conversion section method,considering the contribution of the liner,agree well with the test values,and the average error is below 10%and partial to safety.The design of the lined pipe members by the conversion section method can optimally consider the liner’s bearing capacity.The research results can provide some reference for the design and application of the line
作者
杨璐
冈毅
王法承
朱振兴
Yang Lu;Gang Yi;Wang Facheng;Zhu Zhenxing(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2023年第11期1157-1163,共7页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51879143)
国家自然科学基金优秀青年科学基金资助项目(51922001)
应急管理部消防救援局重点攻关项目(2020XFZD02).
关键词
双金属复合管
压弯
承载性能
换算截面法
试验研究
lined pipe
eccentric compression
bearing performance
conversion section method
test
