考虑拉伸刚化效应的FRP筋/混凝土轴拉构件变形计算方法  

Deformation analysis method of FRP bar/concrete tension members by considering tension stiffening effect

作　　者：范兴朗[1] 黄俊超 吴熙[2] 周欣竹[1] FAN Xinglang;HUANG Junchao;WU Xi;ZHOU Xinzhu(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;College of Engineering,Zhejiang University City College,Hangzhou 310015,China)

机构地区：[1]浙江工业大学土木工程学院,杭州310023 [2]浙江大学城市学院工程学院,杭州310015

出　　处：《复合材料学报》2021年第3期932-943,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金青年项目(51708495);浙江省自然科学基金面上项目(LY20E080027,LY20E080006);杭州市农业与社会发展科研自主申报项目(20191203B42)。

摘　　要：考虑拉伸刚化效应是精确计算纤维增强树脂复合材料(FRP)筋/混凝土构件变形和裂缝的基础。提出了考虑拉伸刚化效应的FRP筋/混凝土拉伸构件变形计算的解析方法。首先,对修正Eligehausen黏结滑移模型(修正BPE模型)进行简化提出四线性黏结-滑移模型。根据该模型推导了拉伸构件在不同拉伸荷载阶段的FRP筋、混凝土应力和变形及黏结力和滑移量的分布表达式。结合混凝土开裂判别方法,提出了FRP筋/混凝土拉伸构件的全过程变形计算方法。通过与已有文献试验结果对比验证了本文方法的准确性。对影响拉伸刚化的一些参数进行了敏感性分析。结果表明,混凝土强度和配筋率对拉伸刚化效应影响不大,FRP筋弹性模量是影响拉伸刚化效应的主要因素。The tension stiffening effect is the premise of accurate evaluation of the deformation and crack width of fiber reinforced polymer composite(FRP)bar/concrete members.An analytical method for determining the deformation of FRP bar/concrete tension member was proposed.A simplified four-linear model based on the modified Eligehausen model(modified BPE model)was presented.The distribution of stress,displacement of FRP bars and concrete and the distribution of bond force,slip between bars and concrete were established.By combining with the cracking criterion of concrete,an algorithm for the deformation of FRP reinforced tensive ties at different loading stages was proposed.After verification by comparing with experimental data in the literature,the effects of different parameters on the tension stiffening were analyzed.Parametric analysis results indicate that concrete strength and reinforcement ratio of FRP bars have a minor impact on the tension stiffening effect.However,the elastic modulus of FRP bars dominates the tension stiffening behavior of FRP reinforced concrete tensile elements.

关 键 词：纤维增强树脂复合材料(FRP)筋 轴拉构件 拉伸刚化 黏结-滑移 配筋率 

分 类 号：TB332[一般工业技术—材料科学与工程]