A new simplified procedure to estimate loads on slabs and shoring during the construction of multistorey buildings

Proceedings of the Institution of Civil Engineers - Structures

et al. 2016

Self Cite

This paper describes a simplified method of estimating maximum loads on shores during the construction of multistorey buildings with in situ casting. Calculating this maximum value is fundamental to establish the design load of the shores and thus avoid possible safety problems caused by selecting the wrong type of shore. The procedure was verified and showed a good fit with both the experimental measurements and finite-element method calculations. This simplified procedure will be useful to both researchers and practitioners, who have to deal with this problem in the course of their daily work. The proposal also represents an important technology transfer to the industry as it is in the form of a simplified tool that comes fairly close to the results obtained by complex calculation methods. Actually, the maximum load obtained from the simplified method is 20·72 kN, which is very close to the value 21·37 kN obtained from an advanced finite-element model.

Section: Introductionmentioning

confidence: 99%

Maximum loads on shores during the construction of buildings

Buitrago

Adam

Proceedings of the Institution of Civil Engineers - Structures

et al. 2016

Self Cite

“…However, later studies by other authors such as Liu et al [8], Stivaros & Halvorsen [9], Chen Mosallam [10], Duan & Chen [11], Moragues et al [4], Fang et al [12], Beeby [13] and Alvarado et al [5] agree that Grundy & Kabaila's simplified method [7] overestimates the loads on shoring, mainly due to the fact that the latter authors consider shores to be infinitely stiff. This factor is crucial in considering the effects of clearing, as pointed out by Alvarado et al [6] , Alvarado [14] and Calderón et al [15].…”

Section: Introductionmentioning

confidence: 99%

Temperature effects on load transmission between slabs and shores

Gasch

Calderón

2012

Engineering Structures

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This paper analyses the influence of temperature changes on load transmission between floor slabs and shores during the in situ casting of concrete slabs by the shoring-clearing-striking method. Therefore several experimental studies were carried out which measured both the internal temperature evolution of the slabs and the loads on the shores. With the results of these studies, a Finite Element Model (FEM) of an experimental structure was then developed. In both the FEM and the experimental studies the same behaviour was observed regarding changes in temperature. When temperatures rose, the loads on shores decreased, accompanied by a reduction in slab deflection. When temperatures dropped, the loads on the shores increased, accompanied by an increased slab deflection. In the experimental study, for a temperature increment of ±1ºC the load per surface unit on shores varied between 0.13 kN/m 2 and 0.34 kN/m 2 , which represents between 2% and 6% of the self-weight of the slabs. The main cause of these load variations appears to be the temperature gradient inside the floor slabs.

“…Thus, following Calderón et al's simplified procedure [14], the computer tool calculates the loads on both slabs and shores and verifies that the above condition has been satisfied for each slab and building operation, i.e. that β is equal to or lower than the proportion of the acquired tensile strength.…”

Section: Development and Validation Of Computer-based Tool For Estimamentioning

confidence: 99%

“…The chosen calculation method was the new simplified procedure defined by Calderón et al [14], which is the latest and most complete and has better goodness of fit than the previous simplified methods [14,[31][32][33]. It assumes that the mean deformation of the slabs coincides with the mean deformation of the shores that support them.…”

Section: Development and Validation Of Computer-based Tool For Estimamentioning

confidence: 99%

See 1 more Smart Citation

Improving construction processes of concrete building structures using load limiters on shores

Buitrago

Adam

et al. 2015

Engineering Structures

Self Cite

_____________________________________________________________________________________ AbstractThis paper describes a computer tool for calculating and validating loads on floor slabs and shores in the construction of multistorey buildings with in situ casting. Its chief novelty lies in its optimization unit, designed to produce appropriate and optimum construction processes, which was created by applying exact and heuristic methods: Random Walk (RW), Descent Local Search (DLS) and Simulated Annealing (SA). The system has shown that it can improve three of the most important aspects involved in construction: time, cost and safety. In some cases the optimal solutions were achieved while reducing up to 53% of the cost of the shoring system, in shorter construction time, and meeting all the usual requirements for the construction of this type of building.