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Some factors to be considered in the selection of steel stru
Release time:2017-04-07 11:54:28 | Views：
Some factors to be considered in the selection of steel structure
 
Steel structures are subjected to static or dynamic loads; often, sometimes, or accidentally (e.g., an earthquake); often laden with or without a full load. According to the above characteristics of the load to choose the appropriate steel, and put forward the necessary quality assurance project requirements. For the structural members subjected to dynamic loads directly, the steel with good quality and toughness shall be selected; the structural steel members subjected to static or indirect dynamic loads can be made of steel of general quality.
The plasticity and toughness of the steel decreases with the temperature drop small, especially in the low temperature zone ductile brittle transition temperature decreases sharply, prone to brittle fracture. Therefore, for often in or may be lower under negative temperature of steel structure, especially the welding structure, should choose the chemical composition and mechanical properties of high quality and brittle transition temperature is lower than the temperature of the working environment of the steel structure. Steel connections may be welded or non welded (bolts or rivets). For welding structure, welding is not uniform and the cooling often produces high welding residual stress in the structure; it is difficult to avoid defects of welding structure and welding structure often makes crack damage; welding structure of the overall continuity and good rigidity to defect or crack each other through expansion; in addition, the content of carbon and sulfur is too high will seriously affect the weldability of steel.
Therefore, the quality requirements of welded structural steel should be higher than that of the non welded steel, the content of harmful elements such as carbon, sulfur, phosphorus and so on should be lower, and the plasticity and toughness should be better.
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