SRT Steel Co., Ltd., a professional steel structure qualification, engaged in the engineering and construction of industrial and civil steel structure design, fabrication and installation services professional design Steel Structure Engineering Co., Ltd., to undertake the steel plant, steel platform, steel membrane structure, steel structure rack, steel activities room, color steel plate combination of housing and other steel construction projects. The steel plant structure is the backbone of engineering structures, it must have sufficient strength and stiffness of stability to resist from a variety of vertical and horizontal load of the roof, walls and crane equipment. Single-layer steel plant construction, the roof can be large roof system, referred to as no-purlin roof. Steel roof truss - the purlins - lightweight roof system, or steel beams - purlins - light roof system can be used to set purlins, so called purlin roof. , Plant structure layout, column grid layout: the span of the plant, the number of spans and spacing depending on the process requirements, and considering the structure of the economy and other factors. Column grid layout, you should pay attention to the following question: modulus requirement in the production process, structural requirements, economic rationality. Due process requirements or other reasons, it is sometimes necessary to the spacing local increase. 2, the temperature gap arranged: when the plant planar size is larger, the structure to deform due to temperature changes, so that the member within a large temperature stress, and may lead to cracking of the roof and wall. To avoid these adverse effects, so when the plant plane size is large, should be sewn in horizontal or vertical set the temperature of the plant, the plant is divided into several independent temperature zone independently of each other. Plant support system in a single-layer steel plant, although the support is not a major force component, but it is connected to the main load-bearing structure, making it the stiffness, good stability and an important part of the structure. Appropriate and effective design, layout support system, so that the plant has sufficient strength, stiffness and stability, to ensure the normal use of structural safety. The plant support system can be divided into the column support and roof support. Plant lateral framework of the main load-bearing structure of the steel plant commonly used frame system, because the lateral stiffness of the framework and the formation of larger interior space, easy overhead crane operation to meet the requirements. Plant lateral framework of the general basis of the column foot rigidly connected to the top of the column can be divided into the hinge and just pick two categories. Framework of capitals hinged on the basis of uneven subsidence machine temperature affect the sensitivity, the framework node structure is easy to handle, and does not produce bending moment due to roof truss ends, bottom chord is always tension, can be removed from the bottom chord support settings. But the capitals hinged nowadays column moment, plant lateral stiffness, generally used for cross-plant or plant height is not easy to meet and stiffness. When the steel roof truss, reinforced concrete hybrid structure, often used in the form of hinged frame. On the contrary, in the plant, crane lifting large, the higher stiffness requirements of plant, single-span steel structure plant framework is often used