• Document: Stability Analysis of Rigid Steel Frames With and Without Bracing Systems under the Effect of Seismic and Wind Loads
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International Journal of Civil and Structural Engineering Research ISSN 2348-7607 (Online) Vol. 2, Issue 1, pp: (137-142), Month: April 2014 - September 2014, Available at: www.researchpublish.com Stability Analysis of Rigid Steel Frames With and Without Bracing Systems under the Effect of Seismic and Wind Loads Hussain Imran K.M1, Mrs.Sowjanya G.V2 1 M.Tech student, Department of Civil Engineering, Sri Siddhartha Institute of Technology, Tumkur, India 2 Assitant Professor, Department of Civil Engineering, Sri Siddhartha Institute of Technology, Tumkur, India Abstract: As compared to reinforced concrete structures, steel has got some important properties like high strength and ductility. We know that steel is ductile so it gives warning before failures. All these properties of steel will play very important role in case of seismic and wind resistant design, there are many types of frame such as rigid frame, semi rigid frames and simple frames among these we have taken rigid frames for this case study. The rigid frames are the frames in which the angle between the members doesn’t changes even after the loading and the beam-column connections are moment resisting connections which means do not allow any relative rotations at the joints of the members. Bracing is required to provide lateral stability of the frame. In this project five models are created in which one is without bracing structure and four models with different bracing structures and an attempt is made to analyze the response buildings with and without bracings systems subjected to seismic load and wind load using ETABS and to identify the suitability of the bracing systems to resist the lateral loads efficiently, here the steel considerations like sectional properties, loads and load combinations as per IS 800:2002. The main parameters consider in the present study is to compare the seismic and wind performance of buildings are base shear, roof displacement. The models are analyze by equivalent static analysis as per IS 1893:2002. Effect of Wind Loads on the Structural Systems are analyzed and compared as per IS 875 (part 3). Based on the results and discussions we can conclude that for highly affected earthquake zone-IV and for different wind speed 50m/s, therefore the structure having X- type Bracings are highly effective type of bracing style. Keywords: Rigid frames, Bracings, seismic and Base shear I. INTRODUCTION As we know in western countries steel structures are widely using because of its high strength, ductility property reduces the construction and erection time. The steel is having less weight as compared to reinforced concrete structures so which reduces load on footings. The size of frame members are less as compared to RC structures which gives more space inside the building. In steel structures we know much type of frames such as rigid and simple frames. In rigid frames, beams and columns are joined together with moment resisting connections. Here the bracings are provided to resist lateral stability of the frame. The rigid frames are the frames in which the angle between the members doesn’t changes even after the loading and the beam-column connections are moment resisting connections which means do not allow any relative rotations at the joints of the members. The most fearsome and critical experienced fact nature is Earthquake and its frightful results. Simply we can say an earthquake is unexpected movement earth. When a structure subjected to natural wind from a few minutes to hour then a wind speed would produce a static force on a structure. 1.1 Concentrically Braced Frames Concentrically Braced Frames (CBFs) are a class of structures resisting lateral loads through a vertical concentric truss system, the axes of the members aligning concentrically at the joints as shown in figure 1. CBFs tend to be efficient in resisting lateral forces because they can provide high strength and stiffness. These characteristics can also result in less favourable seismic response, such as low drift capacity and higher accelerations. CBFs are a common structural steel or Page | 137 Research Publish Journals International Journal of Civil and Structural Engineering Research ISSN 2348-7607 (Online) Vol. 2, Issue 1, pp: (137-142), Month: April 2014 - September 2014, Available at: www.researchpublish.com composite system in areas of any seismicity. Steel Concentrically Braced Frames (CBFs) have been used for years in steel construction and therefore have been studied extensively for seismic performance. These guidelines, however are generally too conservative and actually produce CBFs that are ineffective in seismic events. CBFs are strong, stiff and ductile, making them ideal for seismic framing systems. The inelastic behavior of the brace provides most

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