Finite Element and Direct Design Method in Combined Torsion, Bending and Shear of Reinforced Concrete

2009 ◽  
Author(s):  
E.A. El Hussein
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Design Method ◽  
Direct Design

Analyses of Performance-Based of Reinforced Concrete Beam

2011 ◽  
Vol 368-373 ◽  
pp. 967-970
Author(s):  
Hai Tao Wan ◽  
Hua Yuan
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Simulation ◽  
Concrete Beam ◽  
Design Method ◽  
Reinforced Concrete Beam ◽  
Performance Parameters ◽  
Reinforced Concrete Frame ◽  
Element Simulation ◽  
Load Displacement

The software ABAQUS is used to perform the finite element simulation of a group of reinforced concrete beam tests. The load-displacement skeleton curves of the beams are obtained after the completion of the simulation. Test results and simulation results are compared, results showed that the finite element simulation can be more accurately simulate the test situation. Then, the software ABAQUS is also used to simulate different types of reinforced concrete frame beams, and access to load-displacement skeleton curves and moment – rotation curves of the beams. Reference to the advanced performance-based design method, the curve classified according to different factors. The performance parameters of beams are obtained from the curves. Performance parameters can provide quantitative reference index for performance evaluation of beam.

The Finite-Element Simulation for Reinforced Concrete Frames Including the Softening Behaviour

2011 ◽  
Vol 243-249 ◽  
pp. 204-208
Author(s):  
Wei Guo Jiang
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Design Method ◽  
Nonlinear Static Analysis ◽  
Moment Frames ◽  
Concrete Frames ◽  
Element Analysis ◽  
Softening Behavior ◽  
Performance Based Seismic Design ◽  
Seismic Design Method

In performance-based seismic design method, it is very important to have a good command of the nonlinear performance of a structural system, including in the collapse stage. In this paper, a nonlinear finite-element analysis on reinforced concrete moment frames is carried out. After studying the forces and deformations behavior in beam-column elements, the element stiffness matrix of distributed plasticity beam-column element is deduced using the Cotes scheme with 5 integration points. During the occurrence and development of plastic hinges, sections at some integration points will experience loading, unloading and reverse loading and the stiffness of these sections will experience various status. A quadrilinear form moment-curvature relationships with curvature- softening behavior and the hysteretic modes are used in the nonlinear static analysis program. The numerical analysis is carried out and the numerical results validate the load-displacement relationships and the yield mechanism of experiment frames.

scholarly journals Comparative Study Among Direct Design Method, Equivalent Frame Method and Finite Element Method for Analysis of Slabs

2018 ◽  
Vol 6 (2) ◽  
Author(s):  
Mereen Hassan Fahmi Rasheed ◽  
Bahman Omar Taha
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Design Method ◽  
Computer Software ◽  
Direct Design ◽  
The Face ◽  
Frame System ◽  
Equivalent Frame ◽  
Frame Method ◽  
Element Method

Beam-column frame system and flat plate slab system are analysed by semi-empirical, Direct Design method (DDM) and approximate elastic method, Equivalent Frame method (FEM) and the results of both methods are compared with computer software based on Finite Element method (FEM), taking into account the effect of changing the beam and column stiffness and the panel length ratio, for 3, 4, and 5 equal span frames and three non-equal spans. The moment coefficients with respect to the maximum clear span moment are determined by the three methods for negative end moments at the face of support and mid span positive moment. These coefficients are constant in DDM, while in EFM are changed with changing the column and beam sizes. The results of EFM is more accurate than DDM, on the bases of results of EFM, new moment coefficients are suggested to use instead of DDM moment coefficients. In case of EFM calculation aren’t satisfactory for hand calculations the FEM is used by applying available computer software.

Analysis and deflections of reinforced concrete flat slabs

1998 ◽  
Vol 25 (3) ◽  
pp. 451-466 ◽  
Author(s):  
Alaa G Sherif ◽  
Walter H Dilger
Keyword(s):  
Reinforced Concrete ◽  
Design Method ◽  
Concrete Slab ◽  
The Finite Element Method ◽  
Bilinear Method ◽  
Flexural Members ◽  
Flat Slabs ◽  
Direct Design ◽  
Continuous Slab ◽  
Equivalent Frame

The results of a test on a full-scale 5 m continuous slab are used to study the methods of analysis and calculation of deflection of reinforced concrete flat slabs. The most commonly used methods for the analysis of flat slabs, namely the equivalent frame method, the prismatic member method, the direct design method, and the finite element method, are critically compared using the results of the slab tested. Based on the comparison with the unbalanced column moments in the test, improvements for the prismatic member method are suggested. For the deflection calculations of cracked reinforced concrete flexural members, three methods are investigated: the effective moment of inertia approach, the mean curvature approach, and the bilinear method given in the CEB manual for deflections. To calculate the deflections of flat slabs as column and field strip deflections, new coefficients for distributing the bending moments between the column and middle strips are proposed.Key words: analysis, deflection, flat concrete slab, test.

Structural Optimization of Reinforced Concrete Aqueduct with Multi-Longitudinal Beams Part II: Application

2011 ◽  
Vol 243-249 ◽  
pp. 323-326
Author(s):  
Jun Feng Guan ◽  
Xiao Ke Li ◽  
Shun Bo Zhao
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Optimization Design ◽  
Design Method ◽  
Distribution Patterns ◽  
Internal Force ◽  
Structural Deformation ◽  
Structural Element ◽  
Dead Weight ◽  
Shell Finite Element

Based on a 3-D solid finite element parametric model, an optimization design method of reinforced concrete aqueduct with multi-longitudinal beams is proposed. In this method, the stress of sidewall and subplate is controlled by the sectional crack-resisting criteria, the space between longitudinal beams or crossbeams is decided by the coordination of structural deformation, and the bottom stress of longitudinal beams or crossbeams is restrained by the nominal tensile stress. Taking the lightest dead weight of aqueduct as the objective of optimization, this method is able to give the optimal sizes and distribution patterns of the main load bearing members. The internal force of each structural element of the optimized aqueduct is calculated by a 3-D beam-shell finite element numerical model and thus the reinforcements are arranged. Compared with the prototype, the optimized aqueduct shows the advantages of lighter weight, more reasonable stiffness distribution, coordinated deformation and economical reinforcements.

Carbon Fiber Reinforced the Cracking Framework Top Side Columns Caused by Roof Temperature Deformation

2014 ◽  
Vol 527 ◽  
pp. 3-6
Author(s):  
Wei Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Design Method ◽  
Temperature Deformation ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Fiber Materials ◽  
Roof Temperature

An example of horizontal cracks on the surface of reinforced concrete side-columns is presented. Based on the finite element analysis , a conclusion is made that those cracks are caused by the frame’s deformation under changing temperature. Then the way to calculate the width of such cracks is raised. The design method for the reparation by sticking carbon fiber materials to the column is also developed. Those methods are applicable in realistic works.

scholarly journals Direct Design of T-Beams for Combined Load of Bending and Torsion

2007 ◽  
Vol 4 (1) ◽  
pp. 23 ◽  
Author(s):  
A. S. Alnuaimi ◽  
K.S. Al-Jabri ◽  
A.W. Hago
Keyword(s):  
Reinforced Concrete ◽  
Design Method ◽  
Yield Criterion ◽  
Bending Moment ◽  
Combined Load ◽  
Direct Design ◽  
Flange Thickness ◽  
Failure Loads ◽  
Design Loads ◽  
Transverse Steel

Tests were conducted on five reinforced concrete T-beams subjected to combined load of bending and torsion. Elastic stress field in conjunction with Nielsen's 2D yield criterion for reinforced concrete subjected to in-plane forces were used in the Direct Design Method for the design of reinforcement. The beam dimensions were: flange width = 600mm, flange thickness = 150mm, web width = 200mm, total depth = 600mm and beam length = 5.2m. Required reinforcement calculated using the Direct Design Method was compared with the ACI and BSI codes. It was found that the Direct Design Method requires longitudinal reinforcement similar to the ACI code but less than the BSI code. In the transverse direction, the Direct Design Method requires much less reinforcement than both codes. The main variable studied was the ratio of the maximum twisting moment to the bending moment which was varied between 0.6 and 1.5. Good agreement was found between the design and experimental failure loads. Most of the longitudinal and transverse steel yielded or reached near yield stress when the design load was approached. All beams failed near the design loads and undergone ductile behaviour until failure. The results indicate that the Direct Design Method can be successfully used to design reinforced concrete T-beams for the combined effect of bending and torsion loads. 

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