考虑结构损伤的CFRP修复RC墩柱地震损伤模型研究  

Seismic Damage Model of RC Pier Repaired with CFRP Considering Initial Damage

作　　者：龚婉婷 钱永久[1] 徐望喜 GONG Wanting;QIAN Yongjiu;XU Wangxi(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2024年第2期332-342,共11页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(51778532)。

摘　　要：为研究碳纤维材料(CFRP)修复损伤钢筋混凝土(RC)结构遭受地震作用的损伤演化规律,准确量化修复损伤结构状态,进行了10个钢筋混凝土圆墩柱拟静力试验,其中,8个墩柱试件为使用不同CFRP加固方法进行修复的损伤试件.基于试验结果,对8个典型地震损伤模型进行研究分析,引入材料性能折减系数来考虑结构初始损伤,建立了CFRP修复RC墩柱的双参数地震损伤模型,并根据试验现象和改进的损伤模型对钢筋混凝土结构的损伤程度进行量化分析.研究表明:使用典型地震损伤模型计算修复柱的损伤指标时,计算试件破坏时的损伤指标普遍偏大,且同一墩柱模型损伤指数的变化趋势有较大差异,损伤指数发展趋势与试验现象不符;根据试件参数进行非线性回归分析,得到了组合系数与设计参数的经验表达式,建议的损伤模型能够较好模拟CFRP修复加固墩柱的地震损伤演化过程;定义了钢筋混凝土结构损伤的5个等级,并给出5个等级的损伤指标界限值;对中等损伤(0.3<D≤0.6,D为损伤指标)的墩柱结构,建议对结构表面修复平整后使用预应力CFRP加固以达到更好的效果.In order to study the damage evolution law of damaged reinforced concrete(RC)structures repaired with carbon fiber reinforced plastics(CFRP)under earthquake action and accurately quantify the damage status of repaired structures,a quasi-static test of 10 circular RC piers was carried out,eight of which were repaired by different CFRP reinforcement methods.The test results were studied based on eight typical earthquake damage models,and a two-parameter seismic damage model for RC piers repaired with CFRP was established,in which the reduction coefficient of material properties was introduced to analyze the initial damage to the structure.The damage degree of RC structures was quantified according to the experimental phenomenon and the improved damage model.The results show that when the damage index of the repaired pier is calculated by using the typical earthquake damage model,the damage index of the damaged specimens is generally too large,and the variation of the damage index of the same pier model is quite different.The development trend of the damage index is not consistent with the experimental phenomenon.Based on the nonlinear regression analysis of the specimen parameters,the empirical expressions of the combination coefficients and design parameters are obtained.The proposed damage model can better simulate the seismic damage evolution process of piers repaired with CFRP.Five grades of RC structure damage are defined,and the damage index limit value of the five grades is given.For moderately damaged pier structures(0.3<D≤0.6,D is the damage index),it is recommended to use pre-stressed CFRP reinforcement after repairing and leveling the structural surface to achieve better results.

关 键 词：地震损伤模型 损伤钢筋混凝土圆墩柱 CFRP 加固方法 修复 

分 类 号：TU375.3[建筑科学—结构工程] U445.7.2[建筑科学—桥梁与隧道工程]