Lightweight LSF steel structural system It is an advanced structural system that is used in all kinds of constructions such as villa houses, residential and office buildings, hotels and apartment hotels, school and university buildings, restaurants, etc., and is one of the most suitable systems. These are the buildings that are used in the world today. According to the calculations of experts, in natural disasters such as earthquakes, our lives are threatened by dead loads. Dead loads include heavy materials on walls, floors and ceilings, as well as our livelihoods. Lightweight steel structures, due to the integration of the components and light weight, show the most appropriate behavior against the forces caused by the earthquake. Another advantage of this Structures can be fast construction, durability and longevity, the ability to assemble and install elsewhere, save energy and materials, beautiful and pleasant designs, ease of execution, higher quality at a lower cost, eliminate errors A human pointed out at the time of the performance and so on.