Đánh giá ảnh hưởng của liên kết dầm thép I với tấm sàn bê tông nhẹ EPS-C đến ổn định tổng thể của dầm

Currently, steel structures are increasingly used in civil construction, often in combination with cast-in-place concrete slabs or composite slabs with profiled steel decking. However, these conventional solutions still face limitations in terms of construction time, material costs, and foundation requirements. The use of precast concrete panels, particularly lightweight Expanded PolyStyrene Concrete (EPS-C) panels, is gaining widespread application due to their advantages in reducing structural weight, lowering foundation costs, and accelerating construction schedules. In practical design, one persistent issue is the omission of the influence of slab stiffness and the interaction between steel beams and concrete slabs, which leads to suboptimal beam designs. This paper presents an evaluation of the effect of such connections on the global stability of steel beams. The analysis shows that when the contribution of the concrete slab is considered, the required steel volume for long-span beams can be reduced by up to 50% compared to conventional design assumptions. Furthermore, the paper proposes several connection solutions to ensure that the concrete slabs act as restraint points to prevent lateral displacement of the beams.