Numerical evaluation of the perfobond (PBL) shear connector with transverse rebar using coupled rigid Body spring model (RBSM) and solid finite element method (FEM)
Numerical evaluation of the perfobond (PBL) shear connector with transverse rebar using coupled rigid Body spring model (RBSM) and solid finite element method (FEM)
复制标题
DOI：
10.1016/j.istruc.2022.09.117
复制
发表时间：
2022-11
期刊：
影响因子：
4.1
通讯作者：
Muhammad Shoaib Karam;Hikaru Nakamura;Yoshihito Yamamoto;T. Miura
中科院分区：
文献类型：
--
作者：
Muhammad Shoaib Karam;Hikaru Nakamura;Yoshihito Yamamoto;T. Miura
采用RBSM和实体有限元耦合模型，对带横向钢筋的PBL剪力连接件在简单推出试验下的混凝土断裂过程进行了数值分析，定量揭示了其内部破坏机理。数值模型有效地捕捉了试验结果的抗剪承载力和破坏模式。结果表明，随着横筋直径的增大，混凝土传力杆的抗剪能力增强，构件的抗剪承载力随之提高，构件的变形行为由剪切破坏向劈裂破坏转变。重点研究了带横向钢筋试件的内部破坏过程;沿横向钢筋沿着的正应力分布表明，由于压杆的形成，混凝土传力杆区域存在压应力区，压应力从横向钢筋的锚固部分向混凝土传力杆区域传递，并在混凝土传力杆周围和侧边混凝土块中局部化，与无横向钢筋的试件相比，抗剪承载力提高。据评估，抗剪承载力的变化类似于横向钢筋的轴向力的变化。PBL抗剪连接件的抗剪承载力随着轴力的增加而增加，而对钢筋弯矩的反向响应被观察到，并确定PBL抗剪连接件的抗剪承载力的增加的主要贡献来自横向钢筋的轴力。
Numerical analyses focused on the detailed fracture process of concrete in a reinforced PBL shear connector with the transverse rebar subjected to a simple push-out test employing coupled RBSM and solid FEM model were performed to reveal the internal failure mechanism, quantitatively. The numerical model effectively captured the shear capacity and failure modes of test results. It was investigated as the shear resistance of the concrete dowel was enhanced against the increased diameter of the transverse rebar, the shear capacity was improved consequently, and the deformed behaviors transformed from shear to splitting failure. The internal failure process of a specimen with transverse rebar was highlighted; the normal stress distribution along the transverse rebar exhibited the presence of the compressive zones in the concrete dowel region due to the formation of compression struts and compressive stresses transferred from anchored parts of the transverse rebar towards the concrete dowel region and got localized around the concrete dowel and in side concrete blocks and reproduced the enhanced shear capacity compared with specimen without transverse rebar. It was evaluated that the change in shear capacity was similar to the change in axial force of the transverse rebar. The shear capacity of the PBL shear connector increased as the axial force increased, while the inverse response against rebar bending moment was observed and determined that the main contribution towards the increase in the shear capacity of the PBL shear connector was from the axial force of the transverse rebar.