Śliwa-Wieczorek Klaudia, La Scala Armando, Derkowski Wit, Binder Eva
Division of Bridge, Metal and Timber Structures, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.
Dipartimento di Architettura Costruzione e Design, Polytechnic University of Bari, 70126 Bari, Italy.
Materials (Basel). 2024 Dec 11;17(24):6055. doi: 10.3390/ma17246055.
Timber-concrete composites are established structural elements to combine the advantageous properties of both materials by connecting them. In this work, an innovative flexible adhesive connection in different configurations is investigated. Load-bearing capacity, stiffness, and the failure modes were first experimentally investigated by performing push-out tests. Subsequently, a numerical evaluation using ABAQUS 2017/Standard software was carried out in order to develop a three-dimensional numerical model. The Cohesive Zone Model (CZM) is employed to represent the adhesive characteristics at the contact areas between the Cross-Laminated Timber (CLT) and concrete elements. Three different connection configurations were evaluated, each consisting of five push-out specimens. The study investigates the impact of bonding surface area and the alignment of prefabricated glue strips with the load direction on the connection's longitudinal shear load-bearing capacity, stiffness, and slip modulus. In addition, the impact of cyclic loads and the impact of time on displacements were analyzed. The average load capacity of the full surface connection (type A) is 44.5% and 46.2% higher than the vertical adhesive strips (type B) and the horizontal adhesive strips (type C), respectively. However, the initial stiffness of the tested joints depends on the orientation of the prefabricated adhesive fasteners, being approximately 20% higher when the bonding elements are aligned parallel to the load direction compared to when they are oriented perpendicularly.
木材-混凝土复合材料是一种通过连接两种材料来结合其优势特性的结构构件。在这项工作中，对不同配置的创新型柔性粘结连接进行了研究。首先通过进行推出试验对承载能力、刚度和破坏模式进行了实验研究。随后，使用ABAQUS 2017/Standard软件进行了数值评估，以建立三维数值模型。采用粘结区模型（CZM）来表征交叉层压木材（CLT）与混凝土构件接触区域的粘结特性。评估了三种不同的连接配置，每种配置由五个推出试件组成。该研究考察了粘结表面积以及预制胶条与荷载方向的对齐方式对连接纵向抗剪承载能力、刚度和滑移模量的影响。此外，还分析了循环荷载的影响以及时间对位移的影响。全表面连接（A型）的平均承载能力分别比垂直胶条连接（B型）和水平胶条连接（C型）高44.5%和46.2%。然而，测试接头的初始刚度取决于预制粘结紧固件的方向，与粘结元件垂直于荷载方向时相比，当粘结元件平行于荷载方向对齐时，初始刚度大约高20%。
