Influence of Brittle Fracture of Shear Connectors on Flexural Behavior of Steel–Plate Concrete Composite Beams Under Cyclic Loading
Influence of Brittle Fracture of Shear Connectors on Flexural Behavior of Steel–Plate Concrete Composite Beams Under Cyclic Loading
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DOI：
10.1007/s13296-020-00409-2
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发表时间：
2020-09
影响因子：
1.5
通讯作者：
B. Lu;C. Zhai;Shuang Li;Duofa Ji;Xianbin Lu
中科院分区：
文献类型：
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作者：
B. Lu;C. Zhai;Shuang Li;Duofa Ji;Xianbin Lu
已有的推出试验结果表明，在反复荷载作用下，拉筋和栓钉的极限抗剪承载力和极限滑移量明显低于单调荷载作用下的极限抗剪承载力和极限滑移量，这对钢板混凝土组合结构的抗震性能有显著影响。研究了两根SC梁在低周反复荷载作用下的弯曲性能。采用拉筋连接的SCB1为部分剪力连接，采用拉筋和栓钉连接的SCB2为完全剪力连接。研究了钢板的破坏形态、滞回曲线、骨架曲线、等效抗侧刚度、耗能能力、界面滑移分布、界面剪切分布以及钢板应变等。试验结果表明，两个SC试件均为脆性破坏，主要是由于钢板与混凝土界面处的剪力连接件过早剪切断裂所致。最后，采用两种现有的SC结构规范，分析了SC梁的弯矩和剪力以及拉杆和栓钉的界面剪力。这表明，由于两个试件之间的剪力连接比的差异，两个SC梁的界面剪力分布显着不同。
The existing push-out test results showed that the ultimate shear capacities and ultimate slips of tie-bars and studs under cyclic loading were significantly lower than those under monotonic loading, which could significantly affect the seismic performance of steel–plate concrete composite (SC) structures. The flexural behavior of two SC beams subjected to cyclic loading was investigated. Specimen SCB1 using tie-bars was partial shear connection, and specimen SCB2 using tie-bars and studs was full shear connection. The failure modes, hysteresis curves, skeleton curves, equivalent lateral stiffness, energy dissipation, interfacial slip distribution, interfacial shear distributions, and strain in steel plates were researched. The experimental results show that two SC specimens were brittle failure, which primarily resulted from premature shear fracture of shear connectors at the interfaces between steel plate and concrete. Finally, two existing codes for SC structures were used to analyze the bending moment and shear of SC beams as well as interfacial shear of tie-bars and studs. This indicates that due to the difference of shear connection ratio between two specimens, the interfacial shear distributions of two SC beams were significantly different.