The Study On High-rise Steel Structure Building In High Intensity Areas

The type of construction as steel frame structure, steel braced frame structure andtube structure were most commonly used in the steel construction of high-rise buildings.The steel frame structure flexural strength have good ductility, but weaker stiffness. Theconcentrically braced frame exhibits enough flexural strength and stiffness. Theeccentrically braced frame has well resistant-seismic behavior and multiple seismicfortification lines.In this thesis based on an office building, adopt different forms of braced framescontain steel moment frame, concentrically chevron braced frame, concentricallyX-braced frame and D-TYPE eccentrically braced frame and take theory and finiteelement analysis. The static and dynamic elasto-plastic analysis method was used toanalyze the behavior of structures. The results show that the maximum lateral drift offrames meet the standard request. The ductility of steel moment frame is well, but theresistant-lateral rigidity is weak. The most of the braces of concentrically frame formplastic hinge, and quickly reach limit state under the earthquakes. The bearing capacityand stiffness of structure decreased significantly at the same time. In the structure ofconcentrically X-braced frame, the column connected to the brace reached state ofultimate bearing capacity. The link beam of eccentrically brace frame approaching toshear damage state under the action of the earthquake, the formation of multiple seismicfortification lines. According to the order of plastic hinge appeared in the concentricallyand eccentrically braced frames, the structure of one to three layers is the weak parts ofthe structure.