Design And Seismic Analysis Of The New Steel Inverted V-braces Structure

After the addition of steel braces, the lateral stiffness of steel frame structure has greatlyimproved. However, under the vertical loads, the deformation of beams and columns resultsthat the braces are compressed. The pressure can reach70%of the braces’ total pressure, somost of the strength and stiffness of braces is consumed by the vertical loads. The set ofbraces is to play the role of resistance to horizontal loads, so the braces do not play their duerole completely. In practical engineering, we change the sequence of construction in order toavoid such a situation. We usually install the braces after completing construction of the mainstructure. However, this will extend the time limit. This will cause a lot of inconvenience toconstruction because there is not cran, and this still can not eliminate braces’ pressure causedby working loads.This paper presents a new type of steel braced structure that braces do not bear thevertical loads (hereinafter is referred as the new structure) by improving the connection nodeof braces and beam. The new structure reserve sufficient clearance beween brace’ corbel andsteel beam. The new structure also set long-round bolt hole in the high-strength boltsconnection of brace’ corble and steel beam’ corble. So the new structure achieves theindependent vertical deformation of steel frame and braces. It is that the braces do not bear thevertical loads. The new structure transfers horizontal force by squeezing the contact betweenbrace’ corble and steel beam’ corble tightly. So the new structure realizes that the frame bearsthe vertical loads and the braces bear the horizontal loads because braces’ lateral stiffness ismuch larger than frame’.In this paper, I design design an experiment for the new inverted V-shaped structure, andthen, analysis the three-dimensional elastic-plastic mechanism the seismic performance of thenew structure by the finite element software ANSYS. I get the results of the new structure inthe normal use elastic stage under vertical loads. I also get the results wen the beam begines toyield under vertical loads. I also get the results when the beam appear plastic hinge and underultimate vertical loads. I also get the force of contact and bolts in the elastic stage and whenthe beam begines to yield under horizontal loads. According to the results mentioned above, itshows that the new structure achieve the designing intent well. I also analysis the newstructure’ hysteretic curve, skeleton curve and energy-consuming coefficient under horizontalreciprocating loads. Hysteretic curve presents the spindle. It shows that the new structure hasgood ductility, high bearing capacity, good energy-consuming capacity and excellent seismicperformance. This paper also select an18-storey steel frame braced structure engineering in thesecurity area, verify that the new structure can save steel though the comparative analysis ofthe new structure and traditional structure.