大直径GFRP筋锚具夹片弹性模量对锚具径向应力响应的影响研究  

Study on the Effect of Elastic Modulus of Large-Diameter GFRP Tendon Anchorage Wedges on Radial Stress Response of the Anchorage

作　　者：刘军 刘展伊 张宇 刘鹏 郑仔弟[2] LIU Jun;LIU Zhanyi;ZHANG Yu;LIU Peng;ZHENG Zaidi(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 102616,China;Beijing No.4 Municipal Construction Engineering Co.,Ltd.,Beijing 100176,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京102616 [2]北京市市政四建设工程有限责任公司,北京100176

出　　处：《铁道标准设计》2024年第12期139-148,共10页Railway Standard Design

基　　金：北京市自然科学基金-北京市教委联合资助重点项目(KZ201810016021)。

摘　　要：为研究大直径GFRP筋锚具夹片弹性模量对锚具应力响应的影响,首先基于厚壁圆筒理论建立锚环-夹片-杆体三者表面接触应力响应的力学模型,并进行相应的理论推导;其次采用ABAQUS有限元软件建立二维和三维数值模型,分析不同夹片弹性模量下杆体表面接触压力的变化规律,并将数值模拟结果与力学模型计算结果进行比对以验证理论模型的正确性;最后基于已验证的理论模型对锚具夹片的关键因素进行参数分析。数值模拟结果显示,二维及三维模型杆体表面径向应力值随夹片弹性模量增加而增加,并逐渐趋于收敛,二维模型径向应力略小于三维模型径向应力,二者的误差随夹片弹性模量的增加而减小并最终趋于收敛,理论模型计算结果的变化规律与数值模拟一致;理论计算与数值模拟比对结果显示,理论模型计算值位于二维及三维模型模拟结果之间,与二维模型的拟合效果较好,与三维数值模型在夹片弹性模量较低时存在不超过20%的误差;参数分析结果显示,夹片倾角及推进量与径向应力线性正相关,夹片泊松比与径向应力指数型正相关,夹片厚度与径向应力线性负相关。To investigate the effect of the elastic modulus of large-diameter Glass Fiber Reinforced Polymer(GFRP)tendon anchorage wedges on stress response of the anchorage,a mechanical model was first devised based on thick-walled cylinder theory to describe the surface contact stress response of the anchorage ring,wedge,and rod,followed by relevant theoretical derivations.Subsequently,twodimensional(2D)and three-dimensional(3D)numerical models were constructed using ABAQUS finite element software.These models were employed to analyze the variation in surface contact pressure on the tendon under various values of the elastic modulus of wedges.The accuracy of the theoretical model was validated through a comparative analysis between the numerical simulation results and the mechanical model calculations.Finally,a parametric analysis was conducted on key factors of the anchorage wedges based on the validated theoretical model.Numerical simulations revealed that radial stress on the tendon surface in both 2D and 3D models increased with the elastic modulus of wedges and gradually converged.It was observed that the radial stress in the 2D model was marginally lower than in the 3D model with the error between the two models decreasing and eventually converging as the elastic modulus increased.The variation trend in the theoretical model results was consistent with the numerical simulations.A comparison between the theoretical and numerical results demonstrated that the theoretical model??s computed value fell between those of the 2D and 3D models,exhibiting a better alignment with the 2D model and an error within 20%for the 3D model at lower wedge elastic moduli.Parameter analysis revealed that wedge angle and advancement were linearly positively correlated with radial stress,the Poisson??s ratio of wedges was exponentially positively correlated with radial stress,and wedge thickness was linearly negatively correlated with radial stress.

关 键 词：夹片式锚具 夹片弹性模量 厚壁圆筒理论 数值模拟 大直径GFRP筋 

分 类 号：U25[交通运输工程—道路与铁道工程] U446.1[建筑科学—桥梁与隧道工程]