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Abstrak :
In this paper, a research of new connection method on the cold-formed steel in civil engineering structures is presented. The study focuses on the axial and flexural performance on cold-formed steel structures. A cold-formed steel with screw, adhesive and combination connections that have been loaded in tension and flexure until rupture. A comparison strength in tensile and flexure between the joint types and screw joint on cold-formed steel were investigated. The use of adhesive as the joint (connection) be able to increase the structure capacity significantly. Combination joint between screw and adhesive on cold-formed steel structure could prevent premature collapse of the structure. Adhesive in the combination joints also could minimize the bearing failure of screw joint. It was caused by the rigidity cold-formed steel structure that has increased throughout the adhesive joint. The effect of local buckling could be minimized with increasing structural rigidity. The adhesively bonded joint strength is based on the type of adhesive. The joint failure was began at the end of an adhesively bonded area then it propagated to the middle until it was fully degraded.

Abstrak :
Pemanfaatan baja ringan semakin meningkat sebagai bahan alternatif pengganti kayu untuk struktur atap. Bahan ini memiliki beberapa keunggulan antara lain ringan, anti rayap, dan relatif banyak tersedia dengan harga yang wajar. Namun demikian, bahan konstruksi ini memiliki beberapa keterbatasan dalam hal sifat struktural, seperti tegangan sisa, dan rentan terhadap ketidakstabilan dan kebakaran. Studi eksperimental ini mengeksplorasi perilaku balok baja cold-formed berpenampang sederhana dengan penopang sederhana di mana dua penampang C75 disusun dari depan ke depan dan disatukan dengan pembatas pengikat pada sekrup. Dengan bentang 1,3 m, balok akan dikenai uji lentur tiga titik dan uji lentur empat titik pada kondisi suhu ambien dan elevasi. Spesimen akan dimuat di bawah laju pemuatan 0,5 mm/menit dengan pengaturan jarak sekrup yang berbeda. Mekanisme yang dikendalikan oleh elemen pemanas akan dilampirkan untuk mewakili kondisi pada suhu tinggi. Korelasi yang terkait dengan gaya yang diterapkan terhadap defleksi akan ditetapkan. ......The utilization of cold-formed steel is increasing as an alternative material to wood for roof structures. This material has some benefits that include being lightweight, termite-proof, and relatively widely available at a reasonable price. Nevertheless, this construction material has some limitations in terms of structural properties, such as residual stress, and is prone to instability and fire. This experimental study explores the behaviour of simply supported box sections cold-formed steel beams where two C75 sections are arranged front-to-front and put together with tie constraint at the screw. With a span of 1.3 m, the beams will be subjected to a three-point flexural test and four-point flexural test at ambient and elevated temperature conditions. The spesimens will be loaded under a 0.5 mm/min loading rate with different screw spacing arrangements. A heating element-controlled mechanism will be attached to represent conditions at elevated temperatures. The correlation related to applied forces against deflection will be established.

Abstrak :
Cold formed steel has relatively high width-to-thickness ratio elements, which causes it to buckle easily. Combining it with timber laminas would be an effective solution for reducing this buckling problem. This research focuses on the connection system of a cold formed steel-timber composite, which was obtained by attaching several timber laminas to the web part of cold formed steel using screws. The connection used two bolts that were 8 mm in diameter, as well as two different kinds of side plates: steel and plywood. Cold formed steel 75Z08 and Swietenia mahagoni (moisture content 12.2%; specific gravity 0.77) were used for connections and were loaded in parallel and perpendicular directions. In addition, the connections of cold formed steel (without timber laminas) using self-drilling screw fasteners were tested until failure. Numerical analysis predicting the load-slip curve and apparent yield load of the composite joints was carried out using the DOWEL program and the European Yield Theory, respectively. The test results showed that the connection system with steel side plates is capable of accommodating the strength increase of composite member, as it has a maximum load carrying capacity and initial slip modulus of about 4.5 and 2 times larger than those of the cold formed steel connections, respectively. In the case of a connection system with plywood side plates, its joint properties

Abstrak :
Cold formed steel has relatively high width-to-thickness ratio elements, which causes it to buckle easily. Combining it with timber laminas would be an effective solution for reducing this buckling problem. This research focuses on the connection system of a cold formed steel-timber composite, which was obtained by attaching several timber laminas to the web part of cold formed steel using screws. The connection used two bolts that were 8 mm in diameter, as well as two different kinds of side plates: steel and plywood. Cold formed steel 75Z08 and Swietenia mahagoni (moisture content 12.2%; specific gravity 0.77) were used for connections and were loaded in parallel and perpendicular directions. In addition, the connections of cold formed steel (without timber laminas) using self-drilling screw fasteners were tested until failure. Numerical analysis predicting the load-slip curve and apparent yield load of the composite joints was carried out using the DOWEL program and the European Yield Theory, respectively. The test results showed that the connection system with steel side plates is capable of accommodating the strength increase of composite member, as it has a maximum load carrying capacity and initial slip modulus of about 4.5 and 2 times larger than those of the cold formed steel connections, respectively. In the case of a connection system with plywood side plates, its joint properties are similar to those of the cold formed steel connection, except that it has larger joint deformation.