Key Issues in Steel Structure Design - Connections and Nodes
Key Issues in Steel Structure buildings Design - Connections and Nodes
The function of steel structure buildings connection is to combine plates or sections into components, and then combine the components into a whole structure. The connection method and its quality directly affect the working performance of the steel structure. It must be safe, reliable, clear force transmission, simple structure, convenient manufacture and Steel Structure buildings saving.
Rigid joint node: transfer bending moment, shear force, axial force, strong bearing capacity, commonly used in frame beam-column connection. It is necessary to ensure the high strength of welds or bolts to avoid instability caused by insufficient stiffness, and the deformation of the node will not weaken the structural load bearing capacity by more than 5 per cent.
Articulated nodes: transfer only shear and axial forces, do not bear any bending moments adversely affecting the steel structure buildings, and are allowed to rotate (e.g. roof to column connection). The degree of freedom of rotation should be controlled during design to avoid loosening of the connection.
Semi-rigid nodes: the stiffness parameters need to be determined by test or specification, applicable to complex Steel Structure buildings in seismic zones, need to take into account the stiffness and ductility.
Steel strcuture buildings Linking methods and characteristics of nodes.
Bolted connections Ordinary bolts: easy to loosen, need regular maintenance
Ordinary bolts are divided into A, B, C. A and B grade for refined bolts, C grade for rough bolts. A and B grade bolts material performance level of 5.6 or 8.8 grade. C grade bolts material performance level of 4.6 or 4.8 grade. The number before the decimal point indicates that the tensile strength of the finished bolt is not less than 400N/mm2, and the number after the decimal point indicates that its flexural strength ratio is 0.6 or 0.8.
A, B grade refined bolts have smooth surface, high precision and good shear performance. But the production and installation of complex, high price, has been rarely used. c-grade bolts have a large gap, subject to shear, resulting in large shear slip. But the installation is convenient, can be used in the connection along the bolt shaft tensile, as well as the secondary steel structure buildings of the shear connection or installation of temporary fixation.
Star Er is a technology-based construction enterprise committed to promoting scientific and technological innovation to lead future life. We have been specializing in steel construction for more than 10 years.
Our products cover all types of steel structure buildings, including various prefabricated metal building warehouse, steel structure workshops, steel structure garages, steel structure poultry houses, steel structure prefabricated houses, etc.
We not only pay attention to the appearance of the product design, but also pay attention to the functionality and intelligence of the product. We advocate the concept of green building, using environmentally friendly materials, energy saving technology, and are committed to creating sustainable homes that meet the needs of future living. We have a passionate and creative team, including talented designers, engineers and technicians. The company continues to increase investment in research and development, actively introduce advanced technology at home and abroad, and is committed to improving the quality and intelligent level of products.
