The specifications of domestic rolled daily steel are not complete, we can only use welded H-beam. This not only increases the amount of steel used to increase construction costs. Moreover, the stress and deformation caused by welding are difficult to overcome due to the influence of structural stress and the difficulties caused by construction and installation: At present, there is no design institute in China that has rich experience in designing steel houses. China; there is no technical specification for a special steel structure house in China, so it is difficult to grasp some problems in the design process.
Lack of clear design basis, can only refer to the previous steel structure specifications, when encountering specific problems, please domestic and foreign experts repeatedly argued: all construction units in China have not done steel structure high-rise residential for steel structure residential complex complex and fragmentary, column spacing Small and irregular, and the resulting variety of steel components, small components and large number of features have no experience; beam and column joints, beam and beam joint design requires the web to be connected with high-strength Bolts, and the upper and lower flanges are welded, thus resulting in The construction welding speed is very high, but if all the high-strength bolts are not economical: when the steel frame is connected with the reinforced concrete cylinder, the two materials have different construction procedures and different error levels. It is difficult to connect nodes. All of this is something we have never imagined before.
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