Experimental and analytical analysis of pretensioned inverted T-beam with circular web openings

2009 ◽  
Vol 5 (2) ◽  
pp. 203-215 ◽  
Author(s):  
Hock Tian Cheng ◽  
Bashar S. Mohammed ◽  
Kamal Nasharuddin Mustapha
Keyword(s):  
Web Openings ◽  
Analytical Analysis ◽  
T Beam

scholarly journals Shear Stress Distribution in the Opening Chords of Hybrid R/C T-Beams with Opening

2018 ◽  
Vol 147 ◽  
pp. 01005
Author(s):  
Jonie Tanijaya
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Shear Force ◽  
Maximum Shear Stress ◽  
Shear Stress Distribution ◽  
Shear Stresses ◽  
Web Openings ◽  
The Right ◽  
Lower Corner ◽  
T Beam

This study is carried out to evaluate the potential of three hybrid T-beams with web openings theoretical shear stresses distribution. The shear stresses at the opening edges were plotted at the working stage, yielding stage and collapse stage for these three tested beams. The available experimental results from the previous research was compared to the finite element results as well as the developed analytical. The shear stress distribution at the middle of the top and bottom chords of the opening in pure bending region are zero. At the upper and lower corners of the opening occurs the maximum shear stresses. The maximum shear stress occurs at the right lower corner chord at the high moment edge and at the left upper corner chord at the low moment edge in beams with openings at high shear and high flexural – shear region. Furthermore, an extensive parametric study is performed on these beams to find the distributing ratio of the shear force between the opening chords. The shear force at an opening in hybrid R/C T-beam is carried by the top and bottom chords of the opening according to the area – moment of inertia root ratio with the correction factor 0.70.

Load-Deflection Analysis of Pretensioned Inverted T-Beam with Web Openings

2008 ◽  
Vol 400-402 ◽  
pp. 865-872 ◽  
Author(s):  
Hock Tian Cheng ◽  
S. Mohammed Bashar ◽  
Kamal Nasharuddin Mustapha
Keyword(s):  
Analytical Solution ◽  
Prestressed Concrete ◽  
Precast Concrete ◽  
Experimental Program ◽  
Web Openings ◽  
Deflection Analysis ◽  
Experimental Values ◽  
Simplified Procedure ◽  
T Beam ◽  
Precast Prestressed Concrete

A precast, prestressed concrete girder with circular web openings allows building service systems (mechanical, electrical, communications, and plumbing) to cross the girder line within the member’s depth, reducing a building’s floor-to-floor height and the overall height of the structure. These height reductions have the potential to improve the competitiveness of total precast concrete structures versus other types of building systems. The experimental program reported in this paper tested five full-scale inverted-tee girders with circular web openings to failure, to evaluate the openings’ effect on girder behavior. The girders failed in a ductile manner due to diagonal cracking above the openings. The tested girders were designed using available recommendations in the existing literatures. It was observed that concrete fractured from tension zones around an opening, with cracks developing vetically towards the beam flanges. A beam would collapse when the cracks reached the flanges. In the present work, an analytical solution is developed for the load-deflection calculation of prestressed beam with web openings at any load stage. The solution assumes a trilinear deflection response characterized by the flexural cracking initiation, steel yielding, and ultimate capacity. Closed form expressions are presented for the case of simple beams subjected to four-points loading. These expressions are modified from present ACI code equations by incorporating appropriate laboratory determined coefficients in order to predict more precisely with some degree of conservativeness on flexural load-point deflection with any extent of uncracked, postcracked, and postyielded region along their spans. Accordingly, a simplified analysis procedure is developed by adopting a trilinear load-deflection response. The effectiveness of the simplified procedure is demonstrated by comparing its results to those of the analytical solution and the experimental values.

Immediate Deflection of Pretensioned Inverted T-Beam with Circular Web Openings Strengthened with GFRP Using Response Surface Methodology

2013 ◽  
Vol 594-595 ◽  
pp. 516-520 ◽  
Author(s):  
Bashar S. Mohammed ◽  
Hock Tian Cheng
Keyword(s):  
Finite Element ◽  
Carrying Capacity ◽  
Three Dimensional ◽  
Beam Model ◽  
Load Carrying Capacity ◽  
Element Analysis ◽  
Web Openings ◽  
Web Opening ◽  
Load Carrying ◽  
T Beam

The urgent need for a web opening in the pretensioned inverted T-beams after the construction for essential services causes local cracking around the opening which leads to decrease in stiffness and load carrying capacity. Therefore, strengthening the vicinity of the opening is essential to restore the loss in load carrying capacity of the beam using GFRP. To study the deflection of pretentioned inverted T-beam with web opening, three-dimensional finite element beam models are developed before and after GFRP strengthening using the finite element analysis (FEA). Modeling methodology and nonlinear analysis approach in ANSYS are presented. The results obtained from the FEA beam model are compared with the test data in terms of load-deflection curve. It has been concluded that FEA models are good representations for GFRP strengthened beams with web openings in terms of the number of elements, structural details, and, especially, reasonably accurate results in general.

THE IMPACT OF INFORMATION AND COMMUNICATION TECHNOLOGIES ON THE ECONOMY OF OUR COUNTRY

2020 ◽  
Vol 11 (3) ◽  
pp. 80-85
Author(s):  
Bekzod Bobomurodov ◽  
◽  
Dilfuza Akabirxodjayeva
Keyword(s):  
Information And Communication Technologies ◽  
Communication Technologies ◽  
Analytical Analysis ◽  
Information And Communication ◽  
The Impact

This article has discussed the importance of information and communication technologies for the economy of Uzbekistan and the ongoing reforms in this area. The purpose of the study is to give suggestions and recommendations for the development of ICT in Uzbekistan. In the article, an analytical analysis of employment in the field of ICT has been accomplished.

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