IJSTE - International Journal of Science Technology & Engineering | Volume 3 | Issue 09 | March 2017 ISSN (online): 2349-784X
Review on Study of Castellated Beam with &without Stiffeners Miss. Pooja P. Rugge ME Student Department of Civil Engineering ICOER, Wagholi, Pune
Prof. Pallavi K. Pasnur Assistant Professor Department of Civil Engineering ICOER, Wagholi, Pune
Abstract Now a day’s use of castellated beam is become very popular due to its advantageous structural applications. Fabrication of Castellated beam are done by cutting in its web of hot rolled steel (HRS) I section into zigzag pattern & after that the cutting portion are rejoining it over another. By rejoining the cutting portion over one another the depth of the beam is also increases. The openings provided in the web portion is generally circular, hexagonal, diamond or sinusoidal in shape. The load carrying capacity of the castellated beam is increased by increasing the depth of the beam. There are no of modes of failures in the castellated beam due to its increase in depth like lateral torsional buckling, formation of vierendeel mechanism, rupture of welded joint in a web post & shear buckling of web post which needs to take care of. Therefore for minimizing these failures modes study is carried out which shows that use of stiffeners in web portion is important. The literature survey shows that the use of stiffeners in the web portion of castellated beam minimizing the deflection in that portion & also increasing the strength. Review papers are suggested that using stiffeners along the transvers direction reduces the stress concentration near openings. Keywords: Castellated beam, Circular web opening, Hexagonal web opening, finite element analysis, Stiffeners ________________________________________________________________________________________________________ I.
INTRODUCTION
Castellated beam is also called as perforated web. The main objective of perforated web is to increase the moment of inertia which increases by increasing the depth of section. From many years the castellated beam have been used. In 1950s due to cheap labour cost the castellated beam were firstly used in Europe. The most important advantages of castellated beam is to improve strength due to increased depth of the section without any additional weight. Castellated beams are light in weight & strong. They are cheap. They are easy to assemble at the construction site. Castellated beam:
Fig. 1: Castellated beam with different shaped opening.
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Review on Study of Castellated Beam with &without Stiffeners (IJSTE/ Volume 3 / Issue 09 / 068)
II. LITERATURE REVIEW Peijun Wang, Kangrui Guo, Mei Liu, Lulu Zhang work on Shear buckling strength of web-posts in a castellated steel beam with hexagonal web openings. By using finite element method author have studied the shear buckling behaviors of web-post in castellated steel beam under vertical shear with hexagonal web opening. In this paper the FEM of the castellated beam with hexagonal web opening has been carried out. Also comparison of load-middle span deflection curves & buckling deformations of circular opening has been calculated. Delphine Sonck, Jan Belis work on Weak-axis flexural buckling of cellular & castellated columns. Weak-axis flexural buckling resistance is calculated in this paper. While calculating the resistance the influence of the modified residual stress pattern & modified diagram of cellular & castellated beam are recognized. Numerical study of critical bucklin g load & the buckling resistance of simply supported cellular & castellated members are carried out. In the numerical modeling stress pattern are introduced by privios studies. Delphine Sonck, Jan Belis work on Lateral-torsional buckling resistance of cellular beams. In this paper lateral- torsional buckling behavior of cellular beams is investigated using numerical model that was validated based on experimental results. In this model, the effect of the modified residual stress pattern was taken into account. Preliminary design was done by using the results of parametric study. This preliminary design is depends on the European guidelines for the calculation of the lateral-torsional buckling. Peijun Wang, Ning Ma, Xudong Wang work on Numerical studies on large deflection of restrained castellated steel beam in a fire. By using finite element method the large deflection behaviors of restrained castellated steel beam in a fire are investigated . The validation is done by using the numerical results on solid web restrained steel beams at elevated temperature in a fire. The parameters included in the design are expansion ratio, opening dimensions in web portion, shape of the opening, arrangements of the opening. The web opening shape & the arrangement of web opening have very little effect on the behavior of the restrained castellated steel beam in a fire. Peijun Wang, Oijie Maa, Xudong Wang work on Investigation on vierendeel mechanism failure of castellated steel beams with fillet corner web openings. By using finite element modelling the investigation on vierendeel failure of castellated beam with fillet corner web opening is done. Due to fillet web opening the stress redistribution is done which increase the load carrying capacity of the web perfor ated members. In this paper the expansion ratio is taken into account due to that as the expansion ratio increases the global bending moment capacity of the web opening also increases III. CONCLUSION For the castellated beam most research have been done. In that shear buckling strength of castellated beam, lateral-torsional buckling of castellated beam, vierendeel mechanism of castellated beam, weak-axial flexural buckling of beam researches are carried out. Also comparison between two types of openings like circular & hexagonal, diamond & circular are calculated. From above all reviews it is observed that, there is lac of study castellated beam with & without stiffeners by experimental & analytical method. So, in this project I am going to investigate structural behavior of castellated beam with & without stiffeners. ACKNOWLEDGMENT I would heartly like to thanks my project guide Prof. P. K. Pasnur as well as our Principal Dr. D. D. Shah who gave me chance to do this review paper which helped me in doing a research in my project. I am also thankful to my parents & friends for supporting me in direct or indirect means. REFERENCES [1] [2] [3] [4] [5] [6] [7]
Peijun Wang, Kangrui Guo, Et.Al. (2016) “Shear buckling strength of web-posts in a castellated steel beam with hexagonal web openings”. Delphine Sonck, Jan Belis Et Al. (2016) “Weak-axis flexural buckling of cellular & castellated columns”. Delphine Sonck, Jan Belis Et.Al (2015) “Lateral-torsional buckling resistance of cellular beams” Peijun Wang, Ning Ma, Et Al (2014) “Numerical Studies on large deflection behaviors of restrained castellated steel beams in a fire”- (2014) Peijun Wang, Qijie Ma, Et Al (2014) “Investigation on Vierendeel mechanism failure of castellated steel beams with fillet corner web openings” S.Durif, A. Bouchair, Et Al (2013) “Experimental tests & numerical modelling of cellular beams with sinusoidal openings” Ferhat Erdal, Mehmet Polat Saka (2013) “Ultimate load carrying capacity of optimally designed steel cellular beams”
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Review on Study of Castellated Beam with &without Stiffeners (IJSTE/ Volume 3 / Issue 09 / 068) [8] Hossein Showkati , Tohid Ghanbari Ghazijahani ,Et Al.(2012) “Experiments on elastically braced castellated beams” [9] Ram Chandra, Design of Steel Structure, Volume II, Standard book house, Delhi. [10] S.K. Duggal, Limit State Design of Steel Structure, Tata MeGraw Hill Education.
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