中文摘要：

为了掌握空心板铰缝新旧混凝土界面抗剪性能,并为新旧混凝土界面抗剪数值模拟提供参考,提出了铰缝新旧混凝土界面黏结的数值模拟方法以及界面黏结参数的合理取值。首先,结合国内外新旧混凝土抗剪性能试验研究方法,根据空心板铰缝的结构与受力形式,选择推出试验对空心板铰缝新旧混凝土界面破坏机理与抗剪性能进行了研究,推出试验共3组试件,每组试件由左、中、右3块试件组成,按1∶2的比例进行缩尺设计。在总结新旧混凝土界面受力性能的数值模拟方法基础上,提出了数值模拟空心板铰缝推出试验所采用的单元、本构关系和结合面的黏结强度,并对黏结滑移刚度及最终滑移值与峰值应力对应的滑移值的比值进行了分析,最后用推出试验结果验证该数值模拟方法的正确性。研究表明,当铰缝推出试验达到极限强度时,试件将沿铰缝新旧混凝土界面发生脆性破坏,平均抗剪强度为1.1 MPa,以平均剪应力等于0.5 MPa为界限,平均剪应力-滑移曲线近似由直线的弹性阶段和曲线的弹塑性阶段组成;数值模拟过程中铰缝混凝土本构关系采用损伤塑性模型,钢筋本构关系采用理想弹塑性模型,新旧混凝土结合面采用面面接触技术模拟,其中黏结滑移刚度取5 MPa/mm,最终滑移值与峰值应力对应的滑移值之比为2,该方法可获得较好效果。

英文摘要：

In order to grasp the shear performance of the interface between old and new concrete of hinge joints in hollow slab, and provide reference for shear numerical simulation of old and new concrete interface, the numerical simulation method of the bond between new and old concrete interface of hinge joints and the reasonable value of interfacial bond parameters are presented. First, based on the experimental study method of shear behavior of new and old concrete at home and abroad, according to the structure and stress form of hollow slab hinge joints, we studied the failure mechanism and shear performance of the interface between old and new concrete of hinge joints through push-out test. The push-out test consists of 3 groups of specimens, each specimen contains 3 test pieces from left to right which are designed according to the ratio of 1：2 scale. On the basis of summarizing the numerical simulation method of the mechanical behavior of the interface between old and new concrete, we presented the element, the constitutive relation and the bond strength of the bond interface in numerical simulation of push-out test of the hinge joints, and analyzed the bond slip stiffness and the ratio of final slip value to the slip value correctness of the numerical simulation method is verified by corresponding to the peak stress. Finally, the the push-out test result. The resuh indicates that （ 1 ） when the push-out test achieved the ultimate strength, the specimen＇s brittle failure will occur along the new and old concrete interface, the average shear strength is 1.1 MPa, the limit is when the average shear stress is equal to 0. 5 MPa, the average shear stress-slip curve is approximately consisted of linear elastic stage and curvilinear elastic-plastic stage; （2） the constitutive relation of hinge joint concrete in numerical simulation use damaged plasticity model, the constitutive relation of rebar uses ideal elastoplastic model, and the surface.to-surface contact technology is used to simulate the interface betw