复材约束海水海砂混凝土圆柱极限应力及极限应变计算方法分析  

Analysis of calculation method for ultimate stress and strain of FRP-confined seawater sea-sand concrete cylinders

作　　者：李奔奔 李鹏举 詹瑒 LI Ben-ben;LI Peng-ju;ZHAN Yang(Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education,Southeast University,Nanjing 210096,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;School of Civil Engineering and Architecture,Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]南京工业大学土木工程学院,南京211816 [3]南京工程学院建筑工程学院,南京211167

出　　处：《复合材料科学与工程》2021年第12期19-24,59,共7页Composites Science and Engineering

基　　金：东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题基金(CPCSME2019-04);江苏省高等学校自然科学研究面上项目(20KJB560003)。

摘　　要：通过复材约束海水海砂混凝土(SSC)圆柱试验数据考察了3个计算模型(Lim模型、Wei模型及Jiang模型)对极限应力及极限应变的适用性及预测精度。分析结果表明,计算模型预测极限应力的精度总体高于预测极限应变的精度。在预测极限应力的3个模型中,Lim模型和Jiang模型呈现出相似的较高的精度,平均绝对误差AAE分别为10.7%和11.0%,预测值与试验值比值的平均值Mean分别为104.3%和105.8%。Wei模型对极限应力的预测值与试验值相比整体偏低(Mean=81.0%),误差相对较大(AAE=19.6%)。在此3个模型中,建议采用Lim模型来预测复材约束SSC的极限应力,同时Jiang模型由于预测精度与Lim模型相似,但所需公式数量少,相比Lim模型计算更简便,也推荐使用。在预测极限应变的3个计算模型中,Lim模型的精度最高(AAE=27.8%,Mean=99.4%),而Wei模型及Jiang模型则低估了复材约束SSC的极限应变,Mean值分别为74.5%和52.2%,建议采用Lim模型来预测复材约束SSC的极限应变。就整体而言,在3个计算模型中,Lim模型在预测极限应力及极限应变时都取得最佳精度,为预测复材海水海砂混凝土极限状态的最优模型。This paper investigates the applicability and prediction accuracy of three calculation models(Lim's model,Wei's model and Jiang's model)for ultimate stress and strain based on test database of FRP-confined seawater sea-sand concrete(SSC)cylinders.The analysis results show that the accuracy of the calculation model for predicting ultimate stress is generally higher than that of predicting ultimate strain.Among the three models for predicting ultimate stress,Lim's model and Jiang's model show similar high accuracy,with the average absolute error AAE equal to 10.7%and 11.0%,and the average mean of the ratio of the predicted value to the experimental value Mean equal to 104.3%and 105.8%.Compared with the experimental value,the predicted value of the Wei's model for ultimate stress is overall lower(Mean=81.0%),and the error is relatively large(AAE=19.6%).Among these three models,it is recommended to use Lim's model to predict the ultimate stress of FRP-confined SSC.At the same time,Jiang's model is also recommended because of similar prediction accuracy,easier computation with fewer formulas compared with Lim's model.Among the three calculation models for predicting the ultimate strain,Lim's model has the highest accuracy(AAE=27.8%,Mean=99.4%)while Wei's model and Jiang's model underestimate the ultimate strain of FRP-confined SSC,with Mean up to 74.5%and 52.2%,respectively.It is recommended to use Lim's model to predict the ultimate strain of FRP-confined SSC.To sum up,Lim's model is the best model among three calculation models for predicting the ultimate state of FRP-confined SSC since best accuracy has been achieved by Lim's model in both ultimate stress prediction and ultimate strain prediction.

关 键 词：复材约束 海水海砂混凝土 极限应力 极限应变 预测精度 

分 类 号：TB332[一般工业技术—材料科学与工程]