Moment coefficients for design of waffle slabs with and without openings

Ibrahim, Ahmed; Salim, Hani; Eldin, Hamdy Shehab

doi:10.1016/j.engstruct.2011.05.012

Cited by 16 publications

(7 citation statements)

References 2 publications

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“…Currently, there are different methods that have been used in the analysis of waffle slabs, such as the orthotropic plate theory (Bares and Massonnet, 1966; Cusens and Pama, 1975; Timoshenko and Woinowsky-Krieger, 1959), finite-element method, moment distribution coefficients method (Ibrahim et al, 2011; Reiss and Sokal, 1972; Tebbett and Harrop, 1979), and grillage method (Regan, 1981). In this section, based on the classical orthotropic plate theory, a practical design method to predict the moment and deflection of rib is proposed.…”

Section: Structural Design Methodsmentioning

confidence: 99%

“…Based on the orthotropic plate theory, the equivalent thickness method was then established to analyze waffle slabs used in building floors and bridge decks, in which the ratio of flexural rigidity and torsional rigidity was essential (Bares and Massonnet, 1966; Cusens and Pama, 1975). By dividing panels into columns strips and middle strips, the moment distribution coefficient methods for both solid and ribbed flat slabs have been proposed (Reiss and Sokal, 1972) and later modified (Ibrahim et al, 2011; Tebbett and Harrop, 1979). The grillage method, which treated waffle structures as grids parallel to column lines, has been presented (Regan, 1981).…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of prefabricated steel-truss waffle slab under flexural loading

Xie

Xue

Liang

et al. 2019

Advances in Structural Engineering

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A novel type of prefabricated steel-truss waffle slab has been proposed in this article, and compared with traditional waffle slab, there are several typical characteristics of this floor system, including welded steel wire mesh laid in top concrete wythe, orthogonal steel trusses used to reinforce concrete ribs, and foamed concrete blocks filled among the ribs with the purpose of heat insulation and fire resistance. A special template system is adopted for the installation and concrete cast of prefabricated steel-truss waffle slab. All steel segments in prefabricated steel-truss waffle slab are precast and then assembled to form steel system in site. In order to investigate the structural behavior of prefabricated steel-truss waffle slab, two full-scale specimens with different aspect ratio have been experimentally studied under flexural load. The results obtained from the tests have been discussed and analyzed in the context of ultimate flexural load, cracking pattern and failure mode, load–deflection relationship, and load–strain relationship. The experimental results showed that the ultimate load-bearing capacity of prefabricated steel-truss waffle slab has greatly been influenced by the punching shear failure at the rib joints. Three crack types, such as flexural cracks, tensile cracks, and interface cracks, have been exhibited in the final failure of prefabricated steel-truss waffle slab. The deflection development at slab center has presented a four-stage behavior. The significant effect of aspect ratio has also been verified by strain analysis. A computer program has been developed according to the modified structural design method proposed in this article, and the comparison indicated a good agreement between experimental data and theoretical results.

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Section: Structural Design Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of prefabricated steel-truss waffle slab under flexural loading

Xie

Xue

Liang

et al. 2019

Advances in Structural Engineering

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“…The ribbed or waffle slab is a type of structural slab consisting of a series of parallel reinforced concrete T beams that are framed by reinforced concrete girders (Figure 4). According to this design, the slab acts as the flange of the beam, the expanded part serves as the web, and the stretched portions form the ribs [52][53][54][55]. The spacing between the ribs typically ranges from 20 to 30 inches.…”

Section: Structural Flooring Systems Studiedmentioning

confidence: 99%

Selection of a Sustainable Structural Floor System for an Office Building Using the Analytic Hierarchy Process and the Multi-Attribute Utility Theory

AlFaraidy,

Teegala,

Dwivedi

2023

Sustainability

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The integration of green building technology is currently regarded as a critical step towards a sustainable future because it is a means of attaining sustainable development. It takes skill to combine a sustainable ecosystem with comfortable living areas to create eco-friendly building designs. The use of modern technologies can also enhance traditional methods for developing greener structures and thereby help maintain sustainable built environments. This research paper is intended to develop a selection framework to evaluate three different structural floor systems for a high-rise office building in Alhasa, the Kingdom of Saudi Arabia. The three structural floor systems are as follows: a two-way ribbed slab system, a post-tension slab system, and a hollow core slab system. The main selection criteria used for the investigation in this paper are as follows: initial cost, running costs (operating and maintenance costs), salvage value, self-structural weight, and the possibility of utilities passage. A questionnaire survey was designed to collect the opinions of experts (project managers) regarding the relative importance of the different selection criteria, and these were used to determine the most suitable structural system for the office building. The analytic hierarchy process (AHP) was the tool used to determine the weights of the different criteria, and it was applied in combination with an Eigenvector analysis. Another objective of the investigation was to determine the utility preference values of the selection criteria by employing the multi-attribute utility theory (MAUT) technique. The results showed that the most important criterion is utilities passage, which is followed by structural weight and then initial cost, salvage value, and running costs. From the results of this research, we conclude that the system with the highest total value is the post-tension slab system. The limitations of the study include the fact that it only investigated three concrete floor systems commonly used in office buildings in Saudi Arabia, and that it included only five selection criteria that were identified and evaluated by the experts.

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“…Now, the AMH slabs have been widely used in China and generate impressive social and economic values. is has motivated some scholars explore their mechanical behavior and design methods [3][4][5]. Ibrahim et al [3] performed ninety linear and nonlinear analysis models to evaluate the response of various waffle slabs and found modified moment coefficients are needed for waffle slabs.…”

Section: Introductionmentioning

confidence: 99%

“…is has motivated some scholars explore their mechanical behavior and design methods [3][4][5]. Ibrahim et al [3] performed ninety linear and nonlinear analysis models to evaluate the response of various waffle slabs and found modified moment coefficients are needed for waffle slabs. Cheng et al [4] put forward the analytical solutions for the deflection and bending moment of the cellular hollow plates and used finite element elastic analysis to testify the analytical solutions.…”

Section: Introductionmentioning

confidence: 99%

Fire Behavior of Continuous Assembled Monolithic Hollow‐Ribbed Slabs

Ren

Lin

et al. 2020

Advances in Civil Engineering

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To further understand the fire behavior of assembled monolithic hollow-ribbed (AMH) slab floor, a fire test was performed on six small-scale continuous AMH slabs (two by three). In this paper, the special designed furnace and relevant experimental phenomena are briefly introduced. Detailed experimental results in the form of furnace temperatures, temperature distributions, vertical deflections, and failure criteria are presented. The test data indicate that almost all the AMH slabs showed upward displacements during the fire tests, which is very distinct with the isolated AMH slab under fire. As the edge girders transformed into the frame girders gradually, the edge girders would show displacement plateaus. The integrity of the AMH slab under elevated temperature should receive more critical role to serve as its failure criterion compared with the load bearing function. Except fire environment, boundary constraint conditions also have a considerable effect on the elevated temperature deformations of the structural elements. At last, several rational suggestions are provided to improve the fire resistance of the AMH slabs.

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Moment coefficients for design of waffle slabs with and without openings

Cited by 16 publications

References 2 publications

Experimental investigation of prefabricated steel-truss waffle slab under flexural loading

Experimental investigation of prefabricated steel-truss waffle slab under flexural loading

Selection of a Sustainable Structural Floor System for an Office Building Using the Analytic Hierarchy Process and the Multi-Attribute Utility Theory

Fire Behavior of Continuous Assembled Monolithic Hollow‐Ribbed Slabs

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