This paper presents a Cuckoo Optimization Algorithm (COA) model for the cost optimization of the one-way and two-way reinforced concrete (RC) slabs according to ACI code. The objective function is the total cost of the slabs including the cost of the concrete and that of the reinforcing steel. In this paper, One-way and two-way slabs with various end conditions are formulated as ACI code. The t...

The paper is intended to deal with a certain failure of a floor slab type, which was favored in the beginning of the 20 century in Hungary. The main features are: between skeleton ceramic filling elements in situ reinforced concrete beams are prepared during the construction of the relatively narrowly spaced RC beamed slabs. In the studied cases mainly due to the pure workmanship of concrete co...

Abstract At present, the application of U-beams in urban rail transit is gradually increasing, but researches about bridge structural noise are still insufficient. This article took U-type girder as research object and studied distribution on basis energies different frequency band. Firstly, dynamic response under vehicle load was acquired with combination finite element simulation method field...

Long-term exposure to radon increases the risk of developing lung cancer. There is considerable public concern about radon exhalation from building materials and the contribution to indoor radon levels. To address this concern, radon exhalation rates were determined for 53 different samples of drywall, tile and granite available on the Canadian market for interior home decoration. The radon exh...

abstract: Innovative composite structures have been intensively studied towards meeting the demands of civil construction. An example such is slim floor, comprised concrete or slabs positioned at height steel beams, reducing total floor. In Brazil, studies on this system are still in early stages, and due to lack both experience national normative codes, it hardly used Given possible combinatio...

The purpose of this investigation was to study the intra-oral rehardening of acid-softened enamel and fluoride uptake from SnF2 gel. Bovine enamel slabs were softened with 0.1 mol/L lactate buffer at pH 4.0 for 14 hrs and then mounted in a mandibular removable Hawley appliance. Control slabs were worn for 96 hrs by seven adult males whose teeth were brushed daily with a fluoride-free dentifrice...

Abstract This research aims to discuss and determine acoustic performance values for impact noise insulation (L’nT,w) 39 floor system compositions that have different resilient materials wooden laminate finishing. The methodology is organized according ISO 16283-2, 717-2 NBR 15575-3 classification. results obtained demonstrate the prefabricated ribbed slab with prestressed joists ceramic slabs,...