玻璃纤维增强聚合物腰梁受力性能试验与有限元模拟  

Experimental and Finite Element Simulation on Mechanical Properties of Glass Fiber Reinforced Polymer Waist Beams

作　　者：李恒 康海波 秘金卫 李旭辉 姜志军 许绍帅 李飞 白晓宇[3] 闫楠[3] LI Heng;KANG Hai-bo;BI Jin-wei;LI Xu-hui;JIANG Zhi-jun;XU Shao-shuai;LI Fei;BAI Xiao-yu;YAN Nan(Qingdao Construction Engineering Management and Service Center,Qingdao 266071,China;The Fifth Bureau of China State Construction Engineering Corporation,Changsha 410004,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;Gansu Railway Comprehensive Engineering Survey Institute Co.,Ltd.,Lanzhou 730000,China;Changda Building Technology Co.,Ltd.,Weifang 261000,China)

机构地区：[1]青岛市建筑工程管理服务中心,青岛266071 [2]中国建筑第五工程局有限公司,长沙410004 [3]青岛理工大学土木工程学院,青岛266520 [4]甘肃铁道综合工程勘察院有限公司,兰州730000 [5]昌大建筑科技有限公司,潍坊261000

出　　处：《科学技术与工程》2023年第14期6148-6157,共10页Science Technology and Engineering

基　　金：山东省自然科学基金重点项目(ZR2020KE009);中国博士后科学基金面上项目(2018M632641);中国建筑第五工程局有限公司科研课题(220020C4220)。

摘　　要：为探究基坑支护工程中玻璃纤维增强聚合物(glass fiber reinforced polymer,GFRP)腰梁的应力分布规律和变形特性,结合GFRP腰梁力学性能试验及数值模拟,依托于青岛某深基坑工程,利用ABAQUS有限元软件对不同工况下双腹板GFRP腰梁进行了有限元模拟。研究结果表明,与钢材相比,GFRP材料具备较高的抗弯强度,但弹性模量较低;最大加载至700 kN时,双腹板GFRP腰梁变形的室内试验结果和数值模拟结果的变化规律相似,随着荷载水平的增加,呈线性变化,说明GFRP腰梁始终处于弹性工作状态,整体稳定性强。明确了预应力锚杆轴力为300 kN时GFRP腰梁在两端自由、两端约束以及一端约束一端自由3种情况下的应力分布规律和变形特征;对于两端自由的GFRP腰梁,预应力锚杆轴力为150 kN时的应力、位移约为预应力锚杆轴力为300 kN时的50%。研究结果可为类似工程提供借鉴与参考。To investigate the stress distribution regulation and deformation characteristics of GFRP(glass fiber reinforced polymer)lumbar beam in foundation pit support engineering.The finite element simulation of double web GFRP lumbar beam under different conditions was carried out by ABAQUS finite element software based on a deep foundation pit project in Qingdao,combining the mechanical performance test and numerical simulation of GFRP lumbar beam.The results show that the GFRP material has higher bending strength,but lower elastic modulus compared with steel.The experimental test results and numerical simulations of the deformation of the double-web GFRP lumbar beam at a maximum loading of 700 kN show similar patterns of variation.With the increase of the load level,the linear variation was observed,indicating that the GFRP waist beam is always in elastic operating condition and the overall stability is strong.The stress distribution pattern and deformation characteristics of GFRP waist beam with 300 kN prestressing anchor axial force are clarified in three cases:free at both ends,restrained at both ends and restrained at one end and free at one end.For the GFRP waist beam with both ends free,the stresses and displacements at 150 kN prestressing anchor axial force are about 50%of those at 300 kN prestressing anchor axial force.The results of the study can be used as reference for similar projects.

关 键 词：玻璃纤维增强聚合物材料 GFRP腰梁 抗弯强度 数值模拟 工程应用 

分 类 号：TU473.11[建筑科学—结构工程]