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Master's Dissertation
DOI
10.11606/D.18.2016.tde-11082016-164531
Document
Author
Full name
Nivea Mara Pereira Alves
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2002
Supervisor
Committee
Dias, Antonio Alves (President)
Garcia, José Nivaldo
Lahr, Francisco Antonio Rocco
Title in Portuguese
Análise de pontes de madeira protendidas transversalmente formadas por vigas-T
Keywords in Portuguese
Pontes de madeira
Protensão transversal
Vigas-T
Abstract in Portuguese
Neste trabalho é estudada uma variação do sistema estrutural de ponte de madeira com tabuleiro laminado protendido, em que a seção transversal é formada por vigas-T. As nervuras destas vigas são de madeira laminada colada e o tabuleiro de madeira serrada. São analisadas pontes da classe 30, com uma ou duas faixas de tráfego, dimensionando-se os elementos estruturais para diversas situações de projeto, e avaliando-se as influências das espécies e classes de resistência das madeiras e dos fatores geométricos (largura da nervura, altura do tabuleiro e espaçamento entre nervuras) na altura das nervuras. O procedimento de cálculo utilizado no dimensionamento das pontes de madeira formadas por vigas-T baseia-se no método WVU. Para o desenvolvimento deste trabalho, o método foi adaptado aos critérios da Associação Brasileira de Normas Técnicas, "NBR 7188/84 - Cargas móveis em pontes rodoviárias e passarelas de pedestres" e "NBR 7190/97 - Projeto de estruturas de madeira", e programado em software MATHCAD©. Os resultados obtidos indicam que não existe influência significativa na altura da nervura, ao se utilizar madeira da classe C 30 ou C 40 no tabuleiro, ou ao se variar a altura do tabuleiro de 15 até 25 cm. O modelo teórico é avaliado experimentalmente, por meio de modelo reduzido na escala geométrica de 1:5, obtendo-se boa concordância entre os valores experimentais e os teóricos.
Title in English
Analysis of transversely stressed timber bridges composed of T beams
Keywords in English
T-beams
Timber bridges
Transversal stress
Abstract in English
In this work it is studied a variation of the structural system of timber bridge with transversely laminated deck, in which the transversal section is composed of T-beams. The stringers of those beams are made of glued laminated timber and the deck of sawed timber. Bridges of class 30 are analyzed, with one or two traffic lanes, where the structural elements are designed for different project situations, and evaluated the influences of specimens and wood classes and geometric factors (width of stringer, depth of deck and spacing of stringers) in the depth of stringers. The calculus procedure used in the design of the timber bridges composed of T-beams is based on the WVU Method. To the development of this work, the method was adapted to the criteria of the Brazilian standards "NBR 7188/84 - Live Loads in Highway Bridges and Pedestrian Bridges" and "NBR 7190/97 - Project of Timber Structures" and programmed in MATHCAD© software. The results obtained show that there is no significant influence in the depth of stringer, either by using wood class C 30 or C 40, or by varying the height of the deck from 15 to 25 cm. The theoretical model is evaluated experimentally, by means of a reduced model at 1:5 geometric scale, being obtained well agreement between experimental and theoretical values.
 
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Publishing Date
2016-08-11
 
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