Nowadays, with the advancement of the building industry, new structural systems are introduced by researchers. Despite the fact that modern systems have many advantages, they suffer from a common problem that is the lack of sufficient knowledge and experience for designers and executors in how to design and implement them as well as the need for new materials and skilled labors. In the present study, a new structural form was proposed that has both the benefits of modern systems and does not require much new technical knowledge. The system (LBF) consists of hot -rolled box section columns that are arranged at short distances from each other to which square beams are connected. All sections are hot rolled and joints are made by welding so that the implementation problems are rare and the need for skilled labors is obviated. In this paper, had been introduced the components of this construction form. Then, behavior of this connection evaluated with using the Abaqus software and experimental under monotonic loads. The obtained results indicate that this construction form has the potential to be used in regions with low hazard of earthquakes and with low-rise buildings.