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<p>The behavior of the connection between a sidewall and the intermediate roof panel is a crucial aspect of sandwich panels with shotcrete. In this article, a new connection is proposed which is factory manufactured and modular. The concept of installation of a brace in the panel zone was used when developing the new connection, which has been called a “welded bracing connection” (WBC). The WBC was experimentally tested and the results were compared with connections proposed by the Precast Concrete Institute (PCI) and American Concrete Institute (ACI) 318 guidelines. The results showed that the rotational ductility factor of the WBC was 4.125, which was superior to the PCI (3.4) and ACI-318 (3.6) connections. The ultimate momentum values for the WBC, PCI, and ACI were 1196, 1213, and 1237 kgf-m, respectively, and their maximum rotations reached 0.029, 0.0155, and 0.014&#xa0;rad, respectively. According to the envelope curve of hysteresis, the WBC was ductile, while the PCI and ACI specimens appeared to be brittle. The WBC connection showed an increase in the structural degree of indeterminacy, thereby redistributing the forces. This caused a slight decrease in rotational stiffness after cracking. The other two connections experienced a significant decrease in rotational stiffness.</p>

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Experimental Investigation of the Sidewall Connection to the Intermediate Roof Panel in Sandwich Panel Structures with Shotcrete

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Rasoul Ahmadi,
  • Mohammadreza Tavasoli

摘要

The behavior of the connection between a sidewall and the intermediate roof panel is a crucial aspect of sandwich panels with shotcrete. In this article, a new connection is proposed which is factory manufactured and modular. The concept of installation of a brace in the panel zone was used when developing the new connection, which has been called a “welded bracing connection” (WBC). The WBC was experimentally tested and the results were compared with connections proposed by the Precast Concrete Institute (PCI) and American Concrete Institute (ACI) 318 guidelines. The results showed that the rotational ductility factor of the WBC was 4.125, which was superior to the PCI (3.4) and ACI-318 (3.6) connections. The ultimate momentum values for the WBC, PCI, and ACI were 1196, 1213, and 1237 kgf-m, respectively, and their maximum rotations reached 0.029, 0.0155, and 0.014 rad, respectively. According to the envelope curve of hysteresis, the WBC was ductile, while the PCI and ACI specimens appeared to be brittle. The WBC connection showed an increase in the structural degree of indeterminacy, thereby redistributing the forces. This caused a slight decrease in rotational stiffness after cracking. The other two connections experienced a significant decrease in rotational stiffness.