Evaluation of failure mechanism in lap splices and role of stirrup confinement using 3D RBSM
Evaluation of failure mechanism in lap splices and role of stirrup confinement using 3D RBSM
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DOI：
10.1016/j.engstruct.2021.113570
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发表时间：
2021-11
影响因子：
5.5
通讯作者：
U. Farooq;Hikaru Nakamura;T. Miura
中科院分区：
文献类型：
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作者：
U. Farooq;Hikaru Nakamura;T. Miura
采用带梁单元的三维刚体弹簧模型（3D RBSM）对多根变形钢筋搭接接头的粘结性能和破坏机理进行了研究。以往的研究表明，该方法在模拟单个变形钢筋的粘结性能的适用性。在这项研究中，我们验证了适用的数值方法在模拟的粘结应力滑移行为在无约束和约束搭接接头与各种参数。然后，在无约束搭接接头，我们研究了模拟详细的内部裂纹发展考虑到搭接接头的个别钢筋和周围的钢筋，在测试中无法观察到的现象之间的支柱裂纹扩展。结果发现，在故障部分，支柱裂纹互连和传播在一个相对于侧表面的倾斜，造成显着的债券和混凝土应力损失的搭接拼接跨度。因此，我们研究的破坏机制和作用的箍筋的几何和材料特性，在改善性能的搭接接头。
The bond behavior and failure mechanisms of lap splices with multiple deformed rebars were evaluated using a Three-Dimensional Rigid Body Spring Model (3D RBSM) with beam element. Previous studies have shown the applicability of the method in simulating the bond behavior of single deformed rebar. In this study, we validated the applicability of the numerical method in the simulation of bond stress-slip behavior in unconfined and confined lap splices with various parameters. Then, in unconfined lap splices, we investigated the simulated detail internal crack development considering the strut crack propagation between the individual rebar of lap splices and around the rebars, phenomena that cannot be observed in test. It was found that at the failure section, the strut cracks interlink and propagate at an incline relative to the side surfaces, causing significant bond and concrete stress loss in the lap splice span. As a result, we investigated the failure mechanism and the roles of the geometric and material characteristics of stirrups in improving the performance of lap splices.