Abstract Precast concrete sandwich wall panels consist of two outer wythes of precast concrete separated by a middle layer of insulation. In recent years, Fiber-Reinforced Polymer (FRP) shear connectors have been increasingly used since they have lower thermal conductivity compared to traditional steel shear connectors, which can significantly reduce thermal bridging. However, FRP shear connectors have lower stiffness, resulting in partial Degree of Composite Action (DCA), which is an important parameter to describe the structural behavior of the panels. Different methods have been proposed to calculate DCAs, including displacement method, strain method, and load method. This paper will compare and evaluate the effectiveness of these methods. A bending test was conducted on a full size of 7 m × 3 m, precast, prestressed insulated concrete sandwich panel with FRP shear connectors. A non-linear Finite Element (FE) model is created, where good correlations can be achieved between the test and FE results. The FE model is further employed to conduct a parametric study by varying the stiffness of the shear connectors. DCAs for different stiffnesses are calculated using the aforementioned three methods and the applicability and limitation of each method are investigated.

中文翻译：

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不同方法计算保温混凝土夹芯板复合作用度的比较研究

摘要 预制混凝土夹心墙板由两个外层预制混凝土组成，中间有一层保温层。近年来，纤维增强聚合物（FRP）剪力连接件由于其导热系数低于传统钢制剪力连接件，可显着减少热桥接，因此得到越来越多的应用。然而，FRP 剪力连接件刚度较低，导致部分复合作用度 (DCA)，这是描述面板结构行为的重要参数。已经提出了不同的方法来计算 DCA，包括位移法、应变法和载荷法。本文将比较和评估这些方法的有效性。弯曲试验在 7 m × 3 m 的全尺寸上进行，预制，带 FRP 剪力连接件的预应力绝缘混凝土夹芯板。创建了一个非线性有限元 (FE) 模型，其中可以在测试和 FE 结果之间实现良好的相关性。有限元模型进一步用于通过改变剪力连接件的刚度来进行参数研究。使用上述三种方法计算不同刚度的 DCA，并研究了每种方法的适用性和局限性。