钢-连续纤维复合筋珊瑚混凝土梁式拉拔粘结应力分布研究  

Bond Stress Distribution of Steel-FRP Composite Bar Coral Concrete Beam Drawing

作　　者：王磊[1,2] 余涵 章明明 谷健 卢家慧 朱得祥 WANG Lei;YU Han;ZHANG Mingming;GU Jian;LU Jiahui;ZHU Dexiang(College of Civil Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Green Building Materials and Construction Industrialization,Guilin 541004,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]桂林理工大学土木工程学院,桂林541004 [2]广西绿色建材与建筑工业化重点实验室,桂林541004 [3]中国矿业大学力学与土木工程学院,徐州221116

出　　处：《硅酸盐通报》2024年第7期2461-2469,2489,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52178194)。

摘　　要：为探究钢-连续纤维复合筋(SFCB)在珊瑚混凝土中的粘结应力分布,使用梁式拉拔试验方法,对碳纤维增强复合材料(CFRP)筋和不同直径SFCB珊瑚混凝土进行拉拔,并采用光纤Bragg光栅(FBG)传感技术对筋材应力分布变化动态监测。研究结果表明:SFCB直径和钢芯直径均会影响荷载-滑移曲线形状;箍筋对筋材初始粘结刚度和SFCB纤维层加载端应变有明显提升;箍筋一定程度可以增强螺纹钢芯的粘结,对光圆钢芯粘结影响不大;SFCB屈服后的粘结应力分布与屈服前有明显差异,钢芯屈服后应力传递现象更明显;由于钢芯具有较高的弹性模量,在相同荷载下SFCB纤维层粘结段各处粘结应力均要大于CFRP筋。To study the bond stress distribution of steel-fiber reinforced polymer(FRP)composite bar(SFCB)in coral concrete,a beam pull-out test method was adopted to pull out different diameters of SFCB and carbon fiber reforced polymer(CFRP)reinforced coral concrete,and used fiber Bragg grating(FBG)sensing technology to dynamically monitor the stress distribution changes of the reinforcement material.The results of the study show that both SFCB diameter and steel core diameter affect the shape of load-slip curves.The stirrup reinforcement significantly improves the initial bonding stiffness of the reinforcement material and the strain at the loading end of the SFCB fiber layer.Stirrups to a certain extent enhance the bonding of threaded steel cores,but have little effect on the bonding of smooth round steel cores.The distribution of bond stress after SFCB yielding differs significantly from that before yielding,and the stress transfer phenomenon is more pronounced after the steel core is yielded.Due to the high elastic modulus of the steel core,the bonding stress at all points of the SFCB fiber layer bonding section is greater than that of the CFRP reinforcement under the same load.

关 键 词：SFCB 珊瑚混凝土 梁式拉拔试验 粘结应力分布 SFCB应变 光纤光栅传感技术 

分 类 号：TU528.59[建筑科学—建筑技术科学]