GFRP筋超高性能混凝土梁受弯性能有限元分析  

Finite element analysis of bending behavior of ultra-high performance concrete beams with GFRP bars

作　　者：王彦朋 张恒 聂晓梅 张芳芳 WANG Yanpeng;ZHANG Heng;NIE Xiaomei;ZHANG Fangfang(School of Architecture and Surveying Engineering,Shanxi Datong University,Datong 037003,China)

机构地区：[1]山西大同大学建筑与测绘工程学院,山西大同037003

出　　处：《混凝土与水泥制品》2025年第2期63-69,共7页China Concrete and Cement Products

基　　金：山西省高等学校科技创新计划项目(2022L451);大同市应用基础研究项目(2022055);山西大同大学基础青年科研基金项目(2022Q35)。

摘　　要：基于ABAQUS软件中的损伤模型,建立了玻璃纤维增强聚合物(GFRP)筋超高性能混凝土(UHPC)梁的受弯性能有限元模型,研究了UHPC抗压强度、GFRP筋配筋率、GFRP筋极限拉应变、GFRP筋和钢筋混合配筋、GFRP-钢筋复合筋对试件受弯性能的影响,并建立了平衡配筋率计算公式。结果表明:随着UHPC抗压强度的增大,试件的刚度变化有限,极限承载力显著增大;随着GFRP筋配筋率的增大,试件的刚度、极限承载力和跨中最大挠度均增大;随着GFRP筋极限拉应变的增大,试件的极限承载力和跨中最大挠度增大;混合配筋时,随着GFRP筋配筋面积的增加,试件的极限承载力和跨中最大挠度增大;与纯GFRP筋试件相比,GFRP-钢筋复合筋试件有明显的屈服阶段,荷载-跨中挠度曲线呈“三折线”特征;建立的平衡配筋率计算公式的准确度较高。Based on the damage model in ABAQUS software,a finite element model of the bending performance of ultra-high performance concrete(UHPC)beams with glass fiber reinforced polymer(GFRP)bars was established.The compressive strength of UHPC,the reinforcement ratio of GFRP bars,the ultimate tensile strain of GFRP bars,the mixed reinforcement of GFRP bars and steel bars,and the composite reinforcement of GFRP bars and steel bars on the bending performance of the specimens were studied,and a formula for calculating the balanced reinforcement ratio was established.The results show that as the compressive strength of UHPC increases,the stiffness change of the specimen is limited,and the ultimate bearing capacity significantly increases.As the reinforcement ratio of GFRP bars increases,the stiffness,ultimate bearing capacity,and maximum mid-span deflection of the specimen increase.As the ultimate tensile strain of GFRP bars increases,the ultimate bearing capacity and maximum mid-span deflection of the the specimen increase.When mixed reinforcement is used,as the area of GFRP bars increases,the ultimate bearing capacity and maximum mid-span deflection of the specimen increase.Compared with the specimen with pure GFRP bars,the specimen with composite reinforcement of GFRP bars and steel bars has a distinct yield stage,and the load-mid-span deflection curves exhibits a"trilinear"characteristic.The established formula for calculating the balanced reinforcement ratio has high accuracy.

关 键 词：ABAQUS软件 超高性能混凝土(UHPC)梁 玻璃纤维增强聚合物(GFRP)筋 受弯性能 平衡配筋率 

分 类 号：TU375.1[建筑科学—结构工程]