Comparison between solid and hollow reinforced concrete beams

Alnuaimi, Ali; Al‐Jabri, Khalifa; Hago, Abdel Wahid

doi:10.1617/s11527-007-9237-x

Cited by 40 publications

(18 citation statements)

References 2 publications

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“…A hollow beam has a longitudinal void along its span caused by the removal of concrete using lightweight void formers such as Polyvinyl Chloride (PVC) pipes (Joy and Rajeev, 2014;Varghese and Joy, 2016;Ragavi, 2017;Dhinesh and Satheesh, 2017;Al-Gasham, 2015;Ngu, 2017;Parthiban and Neelamegam, 2017), Polystyrene foams (Manikandan et al, 2015), Polypropylene plastic sheets (Kumbhar and Jadhav, 2018) and plastic bottles (Mathew and Varghese, 2016;Sariman and Nurdin, 2018). These beams have been reported to generally offer a lower strength compared to the solid ones (Kumbhar and Jadhav, 2018;Al-Gasham, 2015;Alshimmeri and Al-Maliki, 2014;Alnuaimi et al, 2008;Inoue and Egawa, 1996). This was associated with the changes caused by the void in its cross-sectional configuration which reduces its second moment of inertia and affects its strength (Ngu, 2017).…”

Section: Introductionmentioning

confidence: 99%

The Development of Finite Element Model to Investigate the Structural Performance of Reinforced Concrete Hollow Beams

Ling¹,

Chan²,

Leong³

et al. 2020

Journal of the Civil Engineering Forum

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The self-weight of a reinforced concrete beam contributes to the permanent loads of a structure. This can be reduced by creating a longitudinal void along the beam so that it will not affect the performance of the beam. In addition, this process can reduce the amount of building cost. Therefore, a finite element model was developed in this study with the aid of a computer program, Ansys, to investigate the behavior of the hollow beam. The model was tested for reliability by comparing the predicted results with those obtained from the experiment in terms of the load-displacement responses, mechanical properties, and parametric responses. The result showed that the reliability of the model was questionable. The main cause of the non-reliability was the inaccurate prediction of the beam deflection by the model. The poor prediction of beam deflection led to significant variations of relevant mechanical properties including stiffness, deflection, and ductility. For beam deflection, only 1/3 of the specimens were correctly predicted with a reliability of 36% while the strength properties were discovered to have higher values as observed in the yield and the ultimate strengths with 73% and 64% respectively. However, both the model and experimental results showed the hollow beam was relatively effective when the diameter of the longitudinal void was 1/3 times the beam width and placed at the neutral axis. For the evaluation to improve the reliability, some revision including the properties of the materials, boundary conditions of the beam support, bonding conditions between different materials, and meshing shape and size suppose to be applied to the model.

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Section: Introductionmentioning

confidence: 99%

The Development of Finite Element Model to Investigate the Structural Performance of Reinforced Concrete Hollow Beams

Ling¹,

Chan²,

Leong³

et al. 2020

Journal of the Civil Engineering Forum

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“…The concrete optimization process consisted of designing a cavity in the cross-section. The overall structural behaviour was checked, as well as cracking in the compression zone, which is a determining failure mechanism in hollow cross-sections [9]. Both circular and rectangular shapes were considered for the cavity.…”

Section: Concrete Optimizationmentioning

confidence: 99%

“…However, other approaches are also possible. For instance, designing a cavity in the cross-section of a beam can significantly reduce the amount of concrete required to construct it, although certain structural considerations must then be taken into account [9]. Furthermore, a concrete structure with replaceable components might facilitate building repair and reuse of its components, thereby extending its life span and minimizing its environmental impact [10].…”

Section: Introductionmentioning

confidence: 99%

Environmental Optimization of Precast Concrete Beams Using Fibre Reinforced Polymers

et al. 2019

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Increasing importance is being attached to materials in the life-cycle of a building. In the Netherlands, material life-cycle assessments (LCA) are now mandatory for almost all new buildings, on which basis the building is then awarded a building environmental performance or MPG [Milieuprestatie Gebouwen] score. The objective of this study is to reduce the environmental-economic (shadow) costs of precast reinforced concrete (RC) beams in a conventional Dutch office building, thereby improving its MPG score. Two main optimizations are introduced: first, the amount of concrete is reduced, designing a cavity in the cross-section of the beam; second, part of the reinforcement is replaced with a fibre reinforced polymer (FRP) tube. The structural calculations draw from a combination of several codes and FRP recommendations. Hollow FRP-RC beams (with an elongated oval cavity), and flax, glass, and kenaf fibre tubes yielded the lowest shadow costs. In particular, the flax tube obtained shadow costs that were 39% lower than those of the hollow RC beam (with an elongated oval cavity); which also contributed to decreasing the shadow costs of other building components (e.g., facade), thereby reducing the MPG score of the building. However, this study also shows that it is important to select the right type of FRP as hemp fibre tubes resulted in a 98% increase in shadow costs.

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“…Further, for aesthetic, economic, and functional purposes including leaving spaces for mechanical and electrical supply lines, computer networks, water and sewage pipelines, and reducing member weight to save materials, the openings in RC beams and slabs have become popular in the construction of buildings, bridges, offshore structures, and towers [9][10][11][12]. Many studies have considered various configurations of web openings in RC beams [12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have considered various configurations of web openings in RC beams [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. However, other studies have investigated structural behaviours of RC beams with longitudinal openings [8][9][10][11][26][27][28][29][30][31][32][33][34][35][36][37][38][39], and these studies are related to the current study and can be divided into two big groups, i.e., experimental and numerical studies in a chronological order.…”

Section: Introductionmentioning

confidence: 99%

Structural Efficiency of Hollow Reinforced Concrete Beams Subjected to Partial Uniformly Distributed Loading

et al. 2021

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Reinforced concrete (RC) beams containing a longitudinal cavity have become an innovative development and advantage for economic purposes of light-weight members without largely affecting their resistance against the applied loads. This type of openings can also be used for maintenance purposes and usage space of communication lines, pipelines, etc. RC beams are primarily loaded in the plane of the members, which are two-dimensional in a plane stress state and the dominant structural behaviours include bending, shear, or combination of both. In the present study, six numerical models of RC beams with and without openings were simulated by using commercial finite element software ANSYS to evaluate the structural behaviours of those beam models under the partial uniformly distributed load. Different parameters were assessed, including opening dimensions and shear reinforcement ratios. The obtained numerical results were analysed and verified and were found very close to those obtained from the experimental investigations in the literature. The increase of shear reinforcement ratio could enhance the flexural and shear capacities of the RC beams, and the results also showed that some models sustained flexural failure while the others sustained failure of combined bending and shear.

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Comparison between solid and hollow reinforced concrete beams

Cited by 40 publications

References 2 publications

The Development of Finite Element Model to Investigate the Structural Performance of Reinforced Concrete Hollow Beams

The Development of Finite Element Model to Investigate the Structural Performance of Reinforced Concrete Hollow Beams

Environmental Optimization of Precast Concrete Beams Using Fibre Reinforced Polymers

Structural Efficiency of Hollow Reinforced Concrete Beams Subjected to Partial Uniformly Distributed Loading

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