PBL抗剪连接件疲劳后的剩余力学性能研究

发布时间：2018-06-07 07:49

本文选题：PBL连接件 + 钢-混凝土组合结构　；参考：《湖南大学学报(自然科学版)》2017年07期

【摘要】：为研究钢-混凝土组合结构中PBL(Perfobond Leiste)抗剪连接件在疲劳荷载作用后的力学性能退化规律,设计并制作了9个PBL连接件的推出试件分别进行静力和疲劳试验.其中3个试件为静力破坏试验,重点关注了试件的破坏模式、极限承载力及荷载-滑移曲线.其余6个试件为在经历一定疲劳荷载循环次数后进行静力破坏试验,以疲劳循环次数,疲劳荷载比为参数变量,得到在不同疲劳参数作用后,PBL连接件的极限承载力、残余滑移量、抗剪刚度等力学性能的变化情况.研究结果表明,PBL连接件具有较好的延性,其静载和疲劳后静载的破坏模式均为一侧贯穿钢筋剪断、另一侧贯穿钢筋屈服.疲劳荷载比对PBL连接件剩余承载力影响较大,在同样经历了300万次的循环加载后,荷载比为0.5的极限承载力基本没有下降,而荷载比为0.7的承载力仅为初始静载试验的76.1%;在相同荷载比(0.6)情况下,PBL连接件的承载力随疲劳加载次数呈先慢后快的非线性退化趋势.相对于荷载比而言,残余滑移量对疲劳循环次数更为敏感.抗剪刚度在整个疲劳加载过程中基本保持不变.
[Abstract]:In order to study the degradation law of mechanical properties of PBL(Perfobond Leistee shear joints in steel-concrete composite structures after fatigue loading, nine PBL joints were designed and made to carry out static and fatigue tests respectively. Three of the specimens are static failure tests, focusing on the failure mode, ultimate bearing capacity and load-slip curves of the specimens. The other six specimens were subjected to static failure tests after a certain number of cycles of fatigue loads. The ultimate bearing capacity of PBL connections was obtained by taking fatigue cycles and fatigue load ratios as parameter variables. The variation of mechanical properties such as residual slip, shear stiffness and so on. The results show that PBL joints have good ductility. The failure modes of static load and fatigue static load are shear through one side of steel bar and yield of steel bar on the other side. The effect of fatigue load on the residual bearing capacity of PBL joints is greater than that of PBL joints. After the same 3 million cycles of cyclic loading, the ultimate bearing capacity of the PBL joints whose load ratio is 0. 5 does not decrease basically. When the load ratio is 0.7, the bearing capacity is only 76.1in the initial static load test. Under the same load ratio of 0.6), the load-carrying capacity of PBL connections decreases first and then rapidly with the fatigue loading times. Relative to the load ratio, the residual slip is more sensitive to the number of fatigue cycles. The shear stiffness remains basically unchanged during the whole fatigue loading process.
【作者单位】：东南大学交通学院;
【基金】：国家自然科学基金资助项目(51278119,51078078)~~
【分类号】：TU398.9

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