Rollover stability of precast concrete beams supported by elastomeric bearing pads
| Autor: | Pablo Augusto Krahl, Ricardo Carrazedo, M. K. El Debs |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
precast beam numerical analysis 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Flange 0201 civil engineering law.invention ESTRUTURAS law Precast concrete Girder 021105 building & construction medicine rollover instability lift-off effect eigenvalue analysis Building construction Bearing (mechanical) business.industry bearing pads Stiffness General Medicine Structural engineering nonlinear behavior Finite element method Nonlinear system medicine.symptom business Beam (structure) TH1-9745 |
| Zdroj: | Revista IBRACON de Estruturas e Materiais, Vol 10, Iss 6, Pp 1192-1204 (2017) Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Revista IBRACON de Estruturas e Materiais v.10 n.6 2017 Revista IBRACON de Estruturas e Materiais Instituto Brasileiro do Concreto (IBRACON) instacron:IBRACON |
| ISSN: | 1983-4195 |
| Popis: | During construction of precast girder bridges, there is the concern on rollover instability of the beams when exclusively supported by elastomeric bearing pads. This type of failure has been the focus of recent research due several accidents reported. However, these studies have not considered the nonlinear behavior of elastomeric bearing pads and the lift-off effect. Therefore, this paper presents a parametric study with a finite element model calibrated with experimental results, reported in the literature, through a nonlinear geometrical analysis and considering that concrete behaves linearly. Besides, the experimental results are compared to simplified approaches which account the pad nonlinear behavior and the lift-off effect by utilizing its secant rotational stiffness. From the results, the difference between the instability load from nonlinear geometrical analysis and experimental results was 8.7 %, and the simplified eigenvalue solution and experimental was 11.4 %, which was the best fit compared to the other existing analytical models. From the parametrical analysis, the instability load was considerably decreased by varying the initial lateral deflection, the skewed pad rotation, top flange width and the span of the beam. |
| Databáze: | OpenAIRE |
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