NiTi形状记忆合金纤维与工程水泥基复合材料界面粘结-滑移的本构关系  

Interface bond-slip constitutive relationship between NiTi shape memory alloy fiber and engineered cementitious composites

作　　者：龚晓俊 杨曌[1,2] 任云 付青石 GONG Xiaojun;YANG Zhao;REN Yun;FU Qingshi(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]武汉科技大学高性能工程结构研究院,湖北武汉430065

出　　处：《新型建筑材料》2023年第7期8-14,共7页New Building Materials

基　　金：国家自然科学基金项目(52178158);湖北省自然科学基金项目(2019CFB540);国家级大学生创新创业训练计划项目(202110488009)。

摘　　要：通过循环拉拔试验研究了形状记忆合金(SMA)纤维与工程水泥基复合材料(ECC)的粘结性能及其粘结滑移本构模型。在位移控制循环加载过程中,考虑SMA纤维直径、纤维末端形状和粘结长度的影响,获得拉伸应力位移曲线及粘结应力滑移曲线,结果表明:打结型端头可以为SMA纤维提供充足锚固力,其最大拉伸应力可达1039.7 MPa,分别为弯钩型端头、直型端头的2.69、6.97倍;增加SMA纤维与ECC的粘结长度会降低纤维最大拉伸应力,提高SMA纤维的延性;增大SMA纤维直径可使纤维最大拉伸应力增加,且延性也会增加,纤维更不易断裂;将SMA纤维与ECC的本构模型分为不充分锚固及充分锚固2类分别提出本构关系,试验曲线与拟合曲线基本吻合。The bond performance and bond-slip constitutive model of shape memory alloy fiber(SMAF)and engineering cementitious composite(ECC)were studied by cyclic pullout test.In the displacement-controlled cyclic loading process,the tensile stress-displacement curve and bond stress-slip curve were obtained considering the influence of SMA fiber diameter,fiber end shape and bond length.The results show that the knotted end can provide sufficient anchorage force for SMA fiber,and its maximum tensile stress can reach 1039.7 MPa,which is 2.69 times that of the hooked end and 6.97 times that of the straight end.Increasing the bond length between SMA fiber and ECC will reduce the maximum tensile stress of fiber and improve the ductility of SMA fiber;increasing the diameter of SMA fiber can increase the maximum tensile stress of the fiber,and the ductility will also increase,making the fiber more difficult to fracture.The constitutive models of SMAF and ECC are divided into two types:insufficient anchorage and sufficient anchorage.The experimental curves are basically consistent with the fitting curves.

关 键 词：形状记忆合金纤维 工程水泥基复合材料 粘结性能 本构模型 

分 类 号：TU375[建筑科学—结构工程] TU502