## 1 Introduction  
Floor systems using deck plates have been often used in construction sites, especially for high-rise buildings. A wide variety of deck-plate structural and manufacturing systems have been developed by many research institutions and construction companies due to their better structural performance and inherent construction efficiencies [1; 2; 3; 4]. The deck plate serves as a form for concrete placement, thereby reducing the construction period and expense, noting that the concrete formwork generally occupies approximately thirty percent of the total construction cost [5]. Also, the deck-plate systems provide work space and the deck plate itself plays a role as a flexural member, which can resist the self-weight of concrete to pour and the workload during the construction period.  
The deck-plate system integrated with truss girder by welding has been frequently used these days because of its structural performance suited to high-rise and long-span buildings [3; 6]. The structural safety of this truss deck plate has been evaluated and verified by several researchers [7; 8; 9; 10; 5; 11], and they are currently being used in a number of construction sites.  
The validity for the structural performance of the truss girder-integrated (welded) deck plates have been demonstrated, as described previously, but the welded joints have caused problems such as the loss of zinc-coated section and the subsequent corrosion when used in wet and poorly ventilated areas, spoiling the beauty of the slab [12; 13]. Moreover, it has been difficult to identify the cracks occurring inside the slab because the steel sheet cannot be detached after concrete hardening. [PERSON] et al. [3] proposed a deck-plate system with non-welding truss-type deformed steel wires (TOX deck-plateslab) to solve these sorts of problems. This system involved pressure joining in lieu of spot welding to connect lattice to galvanized steel sheets and does not require welding, thereby not suffering an oxidation-induced rust. For this non-welding deck-plate system, there is, however, still a limitation that the deck plate is hard to decouple from the slab, which makes checking the crack, if any, inside the slab and recycling the deck plate difficult.  
This study thus proposes a deck plate, made of galvanized steel sheet, connected by bolts rather than welding to enable the deck plate to be reused, thereby preventing corrosion for the deck plate, facilitating grasping of the cracks of the slab, and developing an eco-friendly construction method for deck plate. Six full-scale tests were performed to investigate the structural performance of the proposed deck-plate system bolted with truss girder. Three slab depths of 135, 150, and 200 mm and the corresponding span lengths of 3200, 3800, and 4500 mm, respectively, were considered. Local failure modes were examined using measurements from plastic strain-gauges. A numerical study was then performed using a finite element code, LS-DYNA [14; 15], to ensure that the observations from the tests were reliable and to further investigate the global and local responses, which were not confirmed during the tests. The numerically derived failure modes are discussed in detail by comparison to the test results.