钢-聚丙烯混杂纤维陶粒混凝土与螺纹钢筋的黏结力学特性  

Bonding Mechanical Properties Between Ceramsite Concrete with Hybrid Fibers of Steel and Polypropylene and Threaded Rebars

作　　者：朱红兵[1,2] 张娜 余志武 蒋丽忠 徐文康 ZHU Hongbing;ZHANG Na;YU Zhiwu;JIANG Lizhong;XU Wenkang(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;National Engineering Laboratory for High Speed Railway Construction,Changsha 410075,China)

机构地区：[1]武汉科技大学城市建设学院,武汉430065 [2]高速铁路建造技术国家工程实验室,长沙410075

出　　处：《工业建筑》2022年第2期32-36,114,共6页Industrial Construction

基　　金：国家自然科学基金项目(51778630,U1934217)。

摘　　要：为研究钢-聚丙烯混杂纤维陶粒混凝土与钢筋的黏结性能,开展了16组不同混杂纤维掺量陶粒混凝土的立方体抗压强度、劈裂抗拉强度试验,得到了混凝土力学性能随混杂纤维掺量的变化规律。通过钢筋-混凝土黏结性能试验,得到螺纹钢筋与混凝土的极限黏结强度、峰值滑移及试件破坏形态等。基于试验实测黏结强度数据,建立了钢-聚丙烯混杂纤维陶粒混凝土极限黏结强度计算式,该式考虑了未掺加纤维的陶粒混凝土立方体抗压强度、钢纤维和聚丙烯纤维特征参数、钢筋直径、混凝土保护层厚度、黏结长度等参数。基于试验实测黏结强度和滑移值,采用三段式(上升段、水平段、下降段)表达式建立了可描述钢-聚丙烯混杂纤维陶粒混凝土与变形钢筋的黏结滑移模型。In order to study the bond properties between ceramsite concrete roinforced with hybrid fibers of steel and polypropylene and threaded rebars,the cubic compressive strength and splitting tensile strength tests of 16 groups of ceramsite concrete with different hybrid fiber porportion were conducted.The variation of mechanical properties of concrete with hybrid fiber porportion was obtained.The ultimate bond strength,peak slip and failure mode of threaded rebars and concrete were obtained through the bond performance test of rebars and concrete.Based on the measured bond strength data,a formula for calculating the ultimate bond strength of ceramsite concrete with the hybrid fibers was established.The formula took into account the cubic compressive strength of ceramsite concrete without fibers,the characteristic parameters of steel and polypropylene fibers,the diameter of steel bars,the thickness of concrete covers and the bond length.Based on the measured bond strength and slip values,a three-stage(ascending,horizontal and descending)bond slip model was proposed to describe the bond property of ceramsite concrete with the hybrid fibers of steel and polypropylene and threaded rebars.

关 键 词：混杂纤维陶粒混凝土 螺纹钢筋 拉拔试验 黏结强度 黏结滑移模型 

分 类 号：TU528.572[建筑科学—建筑技术科学]