Experimental Research On Load-carrying Capacities Of Wall System Subjected To Compressing And Bending Load And Typical Joints Of Cold-formed Thin-walled Steel Structures

The keel compound wall of a "box" structure has become a growing trend for lower steel residences around the world. It is most notable composed of cold-formed thin-walled steel (less than 2mm) and wallboard. Based on the failure mode and load-carrying capacities of the Wall-Stud system through several experiments, a design method of optimal load-bearing capacities of the keel compound wall system subjected to compression and bending load was presented.Meanwhile, the application of screws has already been proven to be both convenient and efficient on the joints of stalloy. Experiments on typical joints between beams and columns including beam-beam, beam-column and tension equipment have also been carried out for the theoretical analysis.Based on a series of tests, several conclusions can be drawn as follows:1. The contribution of the wallboards towards the overall rigidity of the compound wall is very important. Additionally, the length factor k of the stud embodies the bracing affection of different wallboards. By the hinged connection, the length factor k of the stud of G550 composite wall system with corrugated board and plasterboard equals 0.4 while the stud of the Q235 composite wall system with OSB equals 0.1.2. For the joint of beam-beam, the web of the beam is connected by equal angle steel fasteners with screws. The route of the force is simple and the capacities of the joints depend on the shearing strength of the screws.3. The location of the stiffener for the web of the beam is most influential on the capacity of the beam-column joints. The transmission of the force is not efficient when either the stiffener is outside the beam or there is no-contact with the lower flange of the beam. So, the most efficient way to increase the capacity of the joint is when the stiffener is placed on the beam and touches the lower flange of the beam in close proximity.4. Because of the great thickness and rigidity of the tension device, the capacity of the joints is dependent on the strength of the members that are connected.