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Abstract(1) | Screw | Building Engineering

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  The Experimental Study of Cold-Formed Steel Truss Connections Capacity: Screw and Adhesive Connection    Abstract   —    A series of connection tests that were composed of Cold-Formed Steel (CFS) sections were made to investigate the capacity of connections in a roof truss frame. The connection is controlled by using the two-different type of connection i.e. screws connection and adhesive. The variation of screws is also added applying 1 screw, 2 screws, and 3 screws. On the other hand, the percentage of adhesively material is increased by the total area of screws connection which is 50%, 75%, and 100%. Behaviors illustrated by each connection are examined, and the design capacities projected from the current CFS design codes are appealed to the experimental results of the connections. This research analyses the principal factors assisting in the ductile response of the CFS truss frame connection measured to propose recommendations for connection design, and novelty so that the connection respond plastically with a significant capacity for no brittle failure. Furthermore, the comparison connection was considered for the analysis of the connection capacity, which was estimated from the specimen’s maximum load capacity and the load-deformation behavior. Keywords  —  Adhesive, screw, capacity, connection, cold-formed steel, I.   I NTRODUCTION   Cold-Formed Steel (CFS) structures are one of the most prevalent used types of construction for residential low-rise buildings in Indonesia due to their low cost, ease and fast of construction, thin but have strength to resist lateral forces. In this type construction, the CFS roof truss frame is more commonly used, however in some cases it is possibly used as the main frame of the building. In that matter, The CFS becomes a highly competitive choice to structure development and improvements. To pursue the optimal design that can produce the well-managed cost of construction, the improvement of the framing connection is also completed, in specific, could increase the capacity of the CFS construction system without making the significant modification e.g. structural system and framing materials. This research study is conducted comparative evaluations for optimization of alternative connections, screws and adhesive connection. A number of screws are chosen for comparison with those that are  presently stated for trusses’ connections, expressed 2d and 3d with 1 screw, 2 screws, and 3 screws installed. In fact, the adhesive is also considered to be added in the connection based on the total area of a screw connection. It is implied by the percentage, instantly made by 50%, 75%, and 100%. The evaluation of the vary connections is illustrated on the capacity of the testing specimen. The specimen capacities are reported by the maximum load capacity that was declined by the connection; screws and adhesively connections are included separately. Then, it is also explained the load-deformation behavior analogously as the comparison of the experimental analysis. II.   P REVIOUS S TUDY   In recent years, the study of the developments of the CFS, particularly from low-rise to mid-rise building, has  been enhanced rapidly. Rogers et.al. [1] conducted by the experimental testing method of screwed shear connections with the single overlap specimens. The experimental test was varied the screw type and the number of screws in the connections to predict both the capacity and the failure mode of the connections. In fact, the result showed that none of the specimens failed in mere bending or titling. It is found that when the thinner sheet is toward to the screw head, bearing failure becomes more possibly happened. Yong et.al. and Peköz [2, 3] reported an experimental test for CFS with self-drilling screw subdued in single shear mode and tension mode. In this case, self-drilling screw expressed a better moment capacity and stiffness contrast to the conventional joint. The analysis is also considered to overcome the effective modulus properties e.g. kind of lips, flanges and web dimension subjected to Australian and American sections. Yan and Young [4] investigated the CFS for roof sheeting in connection with a self-tapping screw at ambient and elevated temperature. It could be claimed that the failure of the connection is also proceeded by the alteration  of temperature. The significant temperature may affect the direct failure of the structure. From that experiment, it needs to be evaluated for the combination types of connection that could possibly overcome that matter. A various series of isolated screwed joints is also conducted by Serrette and Peyton [5]. The analysis was held in total 12 specimens of beam-to-column connection. It is implied the different configurations and likens to Eurocode as an analytical model. The result is shown that the initial stiffness of the joint increased as the beam depth increased. Anwar et.al. and Komara [6-9] analyzed the proposed design of CFS by using adhesive and self-drilling screw material implemented by the tension test method. In this study, non-standardized sections were used. It is stated to alternate the connection type only. From that case, the study is further analysis by using standardized profile and using comparative adhesive material that commonly used in Indonesia.
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