Finite element analysis and structural design of pretensioned inverted T-beams with web openings

Cheng, Hock Tian; Mohammed, Bashar S.; Mustapha, Kamal Nasharuddin

doi:10.1007/s11709-009-0030-5

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…(2) lead to Fig. 15 Plastic analysis in interaction diagram of prestressed beam with circular web openings Equations (13) and (14) are the plastic moment capacities at the edges of the opening expressed as a function of M m , the applied bending moment at the centre of the opening. Since the value of M m varies with increase in the applied load, the plastic moment at the plastic hinges will not remain constant but will change during subsequent loading.…”

Section: Formation Of Plastic Hinges At Opening Endsmentioning

confidence: 99%

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Ultimate load analysis of pretensioned inverted T-beams with circular web openings

Cheng¹,

Mohammed

Mustapha

2009

Front. Archit. Civ. Eng. China

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The provision of transverse openings in floor beams to facilitate the passage of utility pipes and service ducts not only results in a more systematic layout of pipes and ducts, it also translates into substantial economic savings in the construction of a multi-storey building. In this paper, ultimate load analysis of statically loaded simply supported pretensioned inverted T-beams with circular web openings is presented. Major findings relevant to ultimate load analysis of pretensioned beams with circular web openings are summarized. An attempt has been made to answer the frequently asked questions related to ultimate load analysis on multiple circular web openings. It has been shown that the analysis method for pretensioned beams with multiple large circular web openings can be further simplified without sacrificing rationality.

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Section: Formation Of Plastic Hinges At Opening Endsmentioning

confidence: 99%

“…Pretensioned beams details[13]. (a) Typical configuration of web openings along pretensioned inverted T-beam's web; (b) dimensional view of inverted T-beam…”

mentioning

confidence: 99%

Ultimate load analysis of pretensioned inverted T-beams with circular web openings

Cheng¹,

Mohammed

Mustapha

2009

Front. Archit. Civ. Eng. China

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“…Due to uncertainty, many studies have been conducted to observe its failure mechanism and predict its ultimate strength [6][7][8]. A web opening in RC deep beams is sometimes essential because it utilizes ducts and pipes and accommodates services, including electricity supplies, gas, and water [9,10]. These web openings can distort the RC deep beam's stress distributions and consequently affect the structural behavior, which requires more attention to reinforcement details or CFRP reinforcement [11,12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Effect of Opening Ratio on Structural Performance of Reinforced Concrete Deep Beam Reinforced with CFRP Enhancements

Ali¹,

Assi²,

Abas

et al. 2022

Infrastructures

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Reinforced concrete deep beams are a vital member of infrastructures such as bridges, shear walls, and foundation pile caps. Thousands of dollars and human lives are seriously threatened due to shear failure, which have developed in deep beams containing web openings. This paper investigates numerically the overall behavior of simply supported concrete deep beams reinforced with carbon fiber-reinforced polymer (CFRP) sheets through forty specimens grouped in four groups. The numerical analysis results agreed well with the experimental results in the literature, particularly the visual failure initiation with a failure load difference of nearly 7%. Finite element analyses indicated that the presence of an opening with considerable width reduced the failure load by about 71% compared to the corresponding solid specimens. In addition, the reinforced concrete deep beam samples started to behave differently when the (b/h) ratio increased more than (2.0). The findings showed that the compression stress strut pathway had been disrupted by the web opening leading to stress redistribution, and the structure will behave as two separate members. Thus, the upper web-opening part sustained the most stress, while the part under the web-opening did not show any stress concentration. The numerical stress distribution results showed that the attributed reason is that rebars and openings helped redirect the stresses to the compression strut. Using CFRP sheets with a width of more than 160 mm significantly improved the reinforced concrete deep beam with web-opening due to the increasing confinement to the upper part of the reinforced concrete deep beams with the opening.

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“…Deep beams serve as load transfer and support elements of offshore based gravity structures [1]. Web openings are often used in such beams to make doors, windows and other facilities, such as ventilation units and air conditioning ducts, accessible, or to accommodate vital facilities [11,12]. Extending such openings because of mechanical demands or changing building functions reduces the shear ability of the element, and thus poses a serious safety risk [11].…”

Section: Introductionmentioning

confidence: 99%

Strengthening the Structural Behavior of Web Openings in RC Deep Beam Using CFRP

et al. 2020

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Deep beams are more susceptible to shear failure, and therefore reparation is a crucial for structural reinforcements. Shear failure is structural concrete failure in nature. It generally occurs without warning; however, it is acceptable for the beam to fail in bending but not in shear. The experimental study presented the structural behavior of the deep beams of reinforced concrete (RC) that reinforces the web openings with externally connected carbon fiber reinforced polymer (CFRP) composite in the shear zone. The structural behavior includes a failure mode, and cracking pattern, load deflection responses, stress concentration and the reinforcement factor were investigated. A total of nine reinforced concrete deep beams with openings strengthened with CFRP and one control beam without an opening have been cast and tested under static four-point bending load till failure. The experimental results showed that the increase the size of the opening causes an increase in the shear strength reduction by up to 30%. Therefore, the larger the openings, the lower the capability of load carriage, in addition to an increase in the number of CFRP layers that could enhance the load carrying capacity. Consequently, utilization of the CFRP layer wrapping technique strengthened the shear behavior of the reinforced concrete deep beams from about 10% to 40%. It was concluded that the most effective number of CFRP layers for the deep beam with opening sizes of 150 mm and 200 mm were two layers and three layers, respectively.

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Finite element analysis and structural design of pretensioned inverted T-beams with web openings

Cited by 9 publications

References 8 publications

Ultimate load analysis of pretensioned inverted T-beams with circular web openings

Ultimate load analysis of pretensioned inverted T-beams with circular web openings

Numerical Investigation on Effect of Opening Ratio on Structural Performance of Reinforced Concrete Deep Beam Reinforced with CFRP Enhancements

Strengthening the Structural Behavior of Web Openings in RC Deep Beam Using CFRP

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