International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Structural Analysis and Design of Different types of Castellated Beam Shaikh Ajim1 , Dond Priyanka R.2, Shirole Nikita R.3, Thorat Punam L. 4 , Shejul Komal S. 5 , Perane Kalyani B. 6 1Guide,
Department of Civil engineering, Ashok Polytechnic, Maharashtra, India Department of Civil engineering, Ashok Polytechnic, Maharashtra, India ---------------------------------------------------------------------***--------------------------------------------------------------------1.1 Fabrication of Castellated beam Abstract - Castellated beams used as roof beams and 2,3,4,5,6Student,
rafters in both simple span, floor beams and girders for heavy and light floor loads, tier buildings, rafter portions of rigid frames, pipe bridges, girts and other special applications. The advantage of castellated beam is increased strength and the economy. They also demonstrate the interesting appearance and use of the web holes. The increased depth is at advantageous as in the case of spandrels or other special architectural features. Use of Castellated beam for different structures rapidly getting acknowledment. The result due to increased depth of section without any addition of weight, strength to weight ratio, their maintenance and painting cost is low. Stress concentration due to occurs near the perforation as well as the shear carrying capacity is reduced is the limitation of castellated beam. Stress is reduced by making perforation near the neutral axis stresses are negligible
Fabrication of castellated beams is simple series of operations when handling as well as controlling equipment is used. Structural steel is made up by burning two or more section at a same time, depending upon their depth. By using a component of the oxy-acetylene gas cutter equipment, steel section is joined. This equipment is an operated electrically propelled buggy which runs on a fixed track. Castellated steel beams fabricated from standard I-sections have many advantages including self-weight–depth ratio, greater bending rigidity, economic construction and architectural appearance. However, the castellated beams results depending on quality of welding, geometry of the beams and the types of loading condition. Hence the behavior of normal and high strength castellated steel beams under combined buckling modes including web post buckling is also considered in this study.
Key Words: Stress, Castellated beam, Girders, Strength, Rafter, Tier buildings, Preformation, Shear.
1. INTRODUCTION
A beam is increased depth without increasing weight and strength is called as castellated beam. It also increased moment of inertia of that section. Castellated beam is used in construction for many years. Today with the improvement of automated cutting and welding equipment, these beams are produced in a maximum number of depths and spans. These beams suitable for both light as well as heavy loading conditions. In the past the cutting angle of castellated beams ranged is 45° to 70° but the present 60°is become standard cutting angle. It should be consider these are approximate values. Actual angles will change slightly from other geometrical requirements. As roof and floor beams joints and purlins, these sections is change solid sections and truss members. Their attributes produce an attractive architectural design feature for workshops, colleges and public buildings. Castellated beams refer to the type of beams which include expanding a standard rolled steel section .The two halves are connected each other by welding or the high points of the web pattern are connected to form a castellated beam. The castellated beams were commonly used in roof beams and rafters in both simple span, floor beams and girders for heavy and light floor loads, tier buildings, rafter portions of rigid frames, pipe bridges, girts and other special applications.
© 2017, IRJET
|
Impact Factor value: 5.181
Fig 1. Coloring on Wood
2. DESIGN OF CASTELLATED BEAM 1. The angle of cut is selected to be 45 for a good design the depth of stem of the t-section at the minimum beam cross-section should not be less than by 4 of the original beam section. 2. The load over the section from the roof is a curtained and the maximum bending moments are computed. 3. The cross sectional area of the t-section at the open
|
ISO 9001:2008 Certified Journal
|
Page 793