SRT Steel Co., Ltd., specializing in the design, fabrication and installation of industrial and civil steel structure engineering and construction services professional design Steel Structure Engineering Co., Ltd., to undertake the steel plant, steel platform, steel membrane structure, steel grid, steel structure activity 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 large, the structure is deformed due to temperature changes, so that the member to produce larger temperature stress, and may lead to cracking of the roof and walls. In order to avoid these adverse effects, so when the plant plane size is large, the seam should be 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 in a steel plant, although the support is not a major force component, but it is connected to the main load-bearing structure, making it great rigidity, stability structures are an important part. 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 can form a large 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 the uneven subsidence machine temperature affect the sensitivity 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 using the hybrid structure of steel roof truss, reinforced concrete, and is often a 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 often used capitals just pick the program