集中荷载作用下弹性支撑矩形钢管混凝土翼缘工字形梁稳定性能研究  

Research on Stability Performance of Rectangular Concrete-filled Tubular Flange I-shaped Beam with Elastic Bracing Under Concentrated Load

作　　者：刘迎春[1] 杨开琳 计静[1] 张文福[2] 邓世林[1] 张智超[1] LIU Yingchun;YANG Kailin;JI Jing;ZHANG Wenfu;DENG Shilin;ZHANG Zhichao(Heilongjiang Key Lab of Disaster Prevention,Mitigation and Protection Engineering,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;School of Architecture Engineering,Nanjing Institute of Technology,Nanjing,Jiangsu 211167,China)

机构地区：[1]东北石油大学黑龙江省高校防灾减灾工程与防护工程重点实验室,黑龙江大庆163318 [2]南京工程学院建筑工程学院,江苏南京211167

出　　处：《河北工程大学学报（自然科学版）》2024年第2期7-15,共9页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(52178143,51578120);黑龙江省自然科学基金联合引导项目(LH2020E018)。

摘　　要：为研究弹性支撑刚度对矩形钢管混凝土翼缘工字形梁稳定性能的影响,开展了集中荷载作用下3根带有不同弹性支撑刚度的矩形钢管混凝土翼缘工字形梁的稳定性能试验,研究试验梁的位移及应变的变化规律,获得梁的失稳形式和稳定承载力。试验结果表明,整个加载破坏过程分为三个阶段,即弹性阶段、弹塑性阶段和破坏阶段,3根试验梁均发生整体弯扭屈曲失稳。随着弹性支撑刚度增加,梁稳定承载力增大,验证了设置弹性支撑可有效地提高该梁的稳定承载力。在试验基础上,利用ANSYS有限元软件对该梁进行非线性屈曲分析,将获得的稳定承载力与试验结果进行对比,误差均小于5%,从而验证有限元分析方法的正确性。最后,研究了混凝土强度、上翼缘含钢率和腹板高厚比等参数对该类梁稳定性能的影响规律。研究表明,增大上翼缘钢管含钢率和减小腹板高厚比均可明显提高该类梁的稳定承载力,而增强混凝土强度对梁的稳定承载力提高较小。In order to study the effect of elastic support stiffness on the stability performance of rectan-gular steel tube concrete flange I-shaped beams,stability performance tests were conducted on three rec-tangular steel tube concrete flange I-shaped beams with different elastic support stiffnesses under con-centrated load.The displacement and strain changes of the test beams were studied,and the instability form and stable bearing capacity of the beams were obtained.The experimental results show that the en-tire loading failure process is divided into three stages,namely the elastic stage,the elastic-plastic stage,and the failure stage.All three test beams experience overall bending torsional buckling instabili-ty.As the stiffness of the elastic support increases,the stable bearing capacity of the beam increases,which verifies that setting elastic support can effectively improve the stable bearing capacity of the beam.On the basis of the experimental results,nonlinear buckling analysis was conducted on the beam using ANSYS finite element software.The obtained stable bearing capacity is compared with the experi-mental results,and the error is less than 5%,thus verifying the correctness of the finite element analysis method.Finally,the influences of parameters such as concrete strength,upper flange steel content,and web thickness ratio on the stability performance of this type of beam are studied.The results show that increasing the steel content of the upper flange steel pipe and reducing the height to thickness ratio of the web can significantly improve the stable bearing capacity of the beam,while enhancing the concrete strength has a relatively small effect on the stable bearing capacity of the beam.

关 键 词：钢管混凝土翼缘梁 弹性支撑 整体稳定 承载力 

分 类 号：TU398[建筑科学—结构工程]