衬塑钢管海水海砂混凝土组合构件受弯性能研究  

Study on flexural behavior of seawater sea-sand concrete filled plastic-lined steel tube composite members

作　　者：吴毅彬 叶勇[3] 余林康[3] 郭子雄 WU Yibin;YE Yong;YU Linkang;GUO Zixiong(School of Civil Engineering&Architecture,Xiamen University of Technology,Xiamen 361024,China;Xiamen Key Laboratory of Transportation Infrastructure Health and Safety,Xiamen University of Technology,Xiamen 361024,China;College of Civil Engineering,Huaqiao University,Xiamen 361021,China)

机构地区：[1]厦门理工学院土木工程与建筑学院,福建厦门361024 [2]厦门理工学院厦门市交通基础设施健康与安全重点实验室,福建厦门361024 [3]华侨大学土木工程学院,福建厦门361021

出　　处：《地震工程与工程振动》2024年第3期84-95,共12页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52278182);福建省自然科学基金项目(2021J01286);福建省科技厅引导性(重点)项目(2023Y0077);厦门市科技计划项目(2023CXY0401)。

摘　　要：对12根衬塑钢管海水海砂混凝土(seawater sea-sand concrete filled plastic-lined steel tube, SSC-PLST)试件进行了受弯加载试验和有限元建模分析,研究该类构件的受弯性能及内衬塑料层对组合构件承载变形能力的影响规律。研究结果表明:SSC-PLST受弯构件的破坏形态具体表现为受压区钢管外凸屈曲、对应位置混凝土被压碎,受拉区钢管屈服、核心混凝土弯曲裂缝细而密,与普通钢管混凝土类似;试件的弯矩-挠度曲线呈三阶段特征,表现出良好的承载与变形性能。SSC-PLST构件不同部分之间的接触应力较小,且分布不均匀。内衬塑料对SSC-PLST构件受弯承载力的影响程度主要与塑料层厚度有关,受钢材强度和混凝土强度的影响较小。最终提出了SSC-PLST受弯构件承载力的简化计算公式,可为该结构构件的工程应用提供参考。A total of 12 seawater sea-sand concrete filled plastic-lined steel tube(SSC-PLST)specimens were tested by flexural loading and finite element modeling.The bending properties of the composite members and the influence of the plastic lining layer on the bending capacity of the composite members were studied.The effect of plastic lining on the load-carrying capacity of SSC-PLST members was investigated.The results show that,the failure pattern of SSC-PLST specimens is similar to that of conventional concrete filled steel tube(CFST)members,namely,the tension zone of steel tube yields and the concrete produces fine and dense flexural cracks,and the compression zone of steel tube buckles and the concrete at the corresponding position is crushed.The bending moment-deflection curve of SSC-PLST members is characterized by three stages,showing good load-carrying and deformation capacities.The contact stress between different components of SSC-PLST member is relatively small and unevenly distributed.The influence of plastic lining on the flexural capacity of SSC-PLST member is mainly related to the thickness of plastic layer,but is less affected by the strength of steel or concrete.Finally,a simplified calculation formula of load-carrying capacity for SSC-PLST flexural members is proposed,which can provide reference for the engineering application of this structural member.

关 键 词：海水海砂混凝土 衬塑钢管 受弯性能 有限元分析 

分 类 号：TU398.9[建筑科学—结构工程]