FRP约束混凝土柱的修正Drucker-Prager模型  

Modified Drucker-Prager model for circular concrete columns confined with FRP

作　　者：张璐珂 张峰[1] 赵国浩 ZHANG Luke;ZHANG Feng;ZHAO Guohao(Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061

出　　处：《复合材料科学与工程》2023年第10期60-68,86,共10页Composites Science and Engineering

基　　金：山东省自然科学基金项目(ZR202102260046,ZR202102240664)。

摘　　要：Drucker-Prager(DP)模型中,摩擦角和内聚力相关的参数决定屈服、硬化软化准则,与膨胀角相关的参数决定流动法则。通过对试验样本数据的分析,确定了摩擦角的影响因素,将摩擦角定义为塑性应变的函数;进而由DP模型的屈服准则更新了内聚力模型。通过计算侧向塑性应变与轴向塑性应变的比率,建立了考虑约束刚度比的膨胀角模型。基于ABAQUS中的USDFLD子程序对修正后DP模型参数实现自定义,结果表明提出的修正后的DP模型可以很好地预测FRP约束混凝土柱的应力-应变响应,具有一定的精度。In Drucker-Prager(DP)model,the parameters related to friction angle and cohesion determine the yield and hardening softening criteria,and the parameters related to dilation angle determine the flow rule.Through the statistical analysis of the test sample results,the influencing factors of the friction angle are determined,and the friction angle is defined as a function of plastic strain.Then the cohesive force model is updated by the yield criterion of DP model.By calculating the ratio of lateral plastic strain to axial plastic strain,the dilation angle model considering constraint stiffness ratio is established.Based on the USDFLD subroutine in ABAQUS,the parameters of the modified DP model are customized.The results show that the modified DP model can predict the stress-strain response of FRP confined concrete columns with certain accuracy.

关 键 词：FRP约束混凝土 DRUCKER-PRAGER模型 摩擦角 内聚力 膨胀角 USDFLD子程序 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]