The Torsional Nonlinear Finite Element Analysis Of Rectangular RC Beams With Openings

With the rapid development of economy and technology, Building on the basis of the original beautiful and comfortable tend to be more functional and intelligent, Now the building often make hydropower and HVAC equipment through the bottom of the beam, However, in order to meet the requirements of building beautiful, condole brings high enormous challenges, It also became the core of the construction unit to control costs.In this paper, use the finite element software ANSYS to analysis and research the crack propagation and deformation characteristics and Steel bar stress and strain of different hole shape and size of the rectangular section reinforced concrete beams that under pure torsion, especially the torsional component of the cracking load and ultimate bearing capacity of torsional, At the same time in order to validate the conclusion more universality, a series of research of Cracking load and The torsional capacity and Cracks form on different cross section aspect ratio and reinforcement ways have been conducted, By contrast, the results are basically identical.Results of comparison show that ANSYS analysis is reliability, and that be safe design method is correct, the simulation is conform to the situation good, the crack propagation form of beams is conform to the beams, and failure pattern is the same, comprehensive considerate shapes and sizes, open width high and high beams without angle of circular hole, the ultimate bearing capacity of torsion is best, When there are angle, the ultimate bearing capacity of torsion beams that width high square with wider range of rectangular holes is higher, The greater the ratio of cross section beams, the ultimate torsion bearing capacity and cracking load is higher, The height of the open hole not suitable than10/27of the big high beam, and the need to take effective reinforcement measures for holes, and should not be more than5/12, When the cross section aspect ratio of less than or equal to2, need to take effective reinforcement measures, Greater than2but not more than5, just use ordinary stirrup encryption way of strengthening, For practicality and safety, The hole of beams in actual engineering, the high beam should not be less than600mm, Select beam that cross section height to width is larger to open, The conclusion can provide reference for the design and practical engineering reference.Based on torsion bearing capacity analysis of space truss model, and computing theory of torsion strength of rectangular section components, combined with calculation formula of the ultimate bearing capacity of the design specification, elicited Ultimate torsion bearing capacity calculation formula of rectangular section reinforced concrete beams, Compared with the results of ANSYS to verify its reliability.