Discussion. The Theory of the Strip Method for the Design of Slabs.

Wood, Rh; Owsianka, A; Hillerborg, Arne; Charrett, D E; Armer, G. S. T.; Mcmillan, Cm; Russell, Henry G.; Melchers, R E; Kemp, Ko; Moncrieff, M.L.A.

doi:10.1680/iicep.1969.7388

Cited by 3 publications

(4 citation statements)

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“…One approach to tackle flat slabs on irregular column layout is to consider strong bands along column lines [7]. These strong bands function as beams hidden inside slab panels.…”

Section: Design Methods Based On "Safe" Lower Bound Theoremmentioning

confidence: 99%

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Irregular flat slabs designed according to the structural membrane approach

Baskaran¹

2008

Magazine of Concrete Research

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In the construction industry, the need for flat slabs supported on columns in an irregular layout is rising. Design methods validated by experimental evidence for flat slabs supported on non-rectangular grid are, however, scarce. To fill this vacuum, two irregular flat slabs were tested at Nanyang Technological University. Those slabs, however, failed at almost twice the design ultimate load, showing the need for more work. In this paper, existing design methods based on lower bound approach are reviewed. Gurley's bimoment concepts are used to check the validity of zero twisting assumption in some of these methods. Also, experimental details of the nine flat slab panels, supported on non-rectangular grid, designed using the structural membrane approach and tested at Cambridge University Engineering Department are provided. Based on the observations, some suggestions are made for practical application of the structural membrane approach to design flat slabs on non-rectangular column grid.

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“…One approach to tackle flat slabs on irregular column layout is to consider strong bands along column lines [7]. These strong bands function as beams hidden inside slab panels.…”

Section: Design Methods Based On "Safe" Lower Bound Theoremmentioning

confidence: 99%

“…Wood and Armer proposed the following equilibrium system as an alternative to Hillerborg's dvanced strip method [7]. Fig.…”

Section: Wood and Armer's Solution To Flat Slabmentioning

confidence: 99%

Irregular flat slabs designed according to the structural membrane approach

Baskaran¹

2008

Magazine of Concrete Research

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“…Various other influence curves by Morice and Little (1954), and Pucher (1964) Armer, 1969) noted that the strip method could be thought of as being similar to a torsion-less grillage method. The grillage method became more popular after the publication of Bridge Deck analysis by Hambly (1976), and by its second edition (Hambly, 1991, which interestingly reintroduced the torsion-less grillage) found grillage analysis the standard method in all bridge design offices.…”

Section: Historic Perspectivementioning

confidence: 96%

Modern concrete bridge deck analysis considering the effects of cracking

Collings

Sagaseta

2021

Proceedings of the Institution of Civil Engineers - Structures

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This paper outlines a refinement to current grillage and linear finite element analysis methods to better estimate the behaviour of reinforced concrete deck slabs on prestressed beam or steel girder bridges, suitable for modern codes of practice and computerised methods. The work is part of research aimed at unlocking the potential of compressive membrane action. The paper proposes a three-phase approach for the prediction of cracking, deflections, ductility and load capacity. The method increases the accuracy of current grillage and conventional linear finite element methods by taking into account flexural cracking extensions using an effective strain method. The method gives better estimates of deflections at serviceability and allows for better estimates of the ultimate load capacity of existing bridges. This results in more economic reinforcement designs with lower carbon footprint for new bridges.

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“…Strip Method:-Is introduced by (Hilleborg, 1956) and developed by (Wood & Armer, 1968) is also based on the assumption that reinforced concrete slabs behave plastically. However, the strip method, unlike yield line analysis, provides a lower bound on the collapse load.…”

Section: ( )mentioning

confidence: 99%

Evaluation of Slab Analysis and Design Practice to Enhance Construction Projects in Ethiopia.

Gebregzabher¹,

Su²

2017

IJAR

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Analysis and design of plate elements is too complex. In most cases, there is no closed form of solution for these intermediate structures.This leads full of assumptions and uncertainty which makes design uneconomical and difficult for day-to-day application. To tackle this problems, researchers and engineers developed simplified method with acceptable reliability and accuracy. Still the limitation is visible that some methods are only applicable to some particular problems. However, many professionals are claiming that the practice is not standard and may damage the economy of once country as whole if some devastating earth quake happens. As a result, care shall be taken during design, construction and service of the buildings. It is clear that buildings shall be safe, economical and serviceable. However, it is very difficult to attain these requirements in developing countries like Ethiopia. The objective of this study is to evaluate slab analysis and design practice in Ethiopia. Data was collected through document analysis and questioners. A total of 18 questioners were prepared and distributed to 45 respondents. Document analysis covers information like international and local challenges faced during analysis and design, approval and construction of slabs. It is also compares and clarifies our code of practice with respect to related international code practice and re-evaluates the country local practical, particularly in Ethiopia. About 40% of contractor and 47.7 % of consultant engineers agreed that the benefits of code preparation did not considered the need for more time, finance and experience with knowledge very well. Similarly, the respondents believed that the designs are done by unqualified and unregistered engineers which suggests that codes are not implemented in day to day design analysis. Overall, Ethiopian slab analysis code needs updating by considering economic, serviceability and safety values.

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Discussion. The Theory of the Strip Method for the Design of Slabs.

Cited by 3 publications

References 0 publications

Irregular flat slabs designed according to the structural membrane approach

Irregular flat slabs designed according to the structural membrane approach

Modern concrete bridge deck analysis considering the effects of cracking

Evaluation of Slab Analysis and Design Practice to Enhance Construction Projects in Ethiopia.

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