Peiretti H.C.,Polytechnic University of Mozambique |
Parrotta J.E.,IDOM S.A. |
Oregui A.B.,FHECOR Consulting Engineers |
Caldentey A.P.,Polytechnic University of Mozambique |
Fernandez F.A.,Polytechnic University of Mozambique
Journal of Bridge Engineering | Year: 2014
This paper presents extensive temperature measurements obtained during a period of 4 years in an integral solid slab prestressed concrete bridge deck. There is very little experimental information available for this bridge typology. The quality of the measured temperature data are validated by comparing experimentally measured displacements at the ends of the bridge with theoretical displacements determined with the recorded temperature components. The measured temperatures are also compared with common design parameters made considering the specifications for thermal actions proposed by Eurocode 1. The results corroborate that the Eurocode 1 formulations are generally adequate to represent thermal actions on bridges; however, it may need to be complemented to define maximum and minimum temperatures for bridges in locations with daily temperature variations greater than 10°C. © 2014 American Society of Civil Engineers.
Caldentey A.P.,Polytechnic University of Mozambique |
Padilla P.,FHECOR Consulting Engineers |
Muttoni A.,Ecole Polytechnique Federale de Lausanne |
Ruiz M.F.,Ecole Polytechnique Federale de Lausanne
ACI Structural Journal | Year: 2012
The shear resistance of elements without stirrups has mainly been investigated by test setups involving simply supported beams of constant thickness subjected to one- or two-point loading, and most of the formulas included in codes have been adjusted using this experimental background. It is a fact, however, that most design situations involve constant or triangular distributed loading (such as retaining walls or footings) on tapered members. Furthermore, there seems to be few shear tests involving cantilever structures subjected to distributed loading. These structures, which are common in everyday practice, fail in shear near the clamped end, where the shear forces and bending moments are maximum (contrary to simply supported beams of tests, where shear failures under distributed loading develop near the support region for large shear forces but limited bending moments). In this paper, a specific testing program undertaken at the Polytechnic University of Madrid (UPM), Madrid, Spain, in close collaboration with Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland, is presented. It was aimed at investigating the influence of load distribution and tapered beam geometrics on the shear strength. The experimental program consists of eight slender beams without stirrups. Four specimens had a constant depth, whereas the others had variable depths (maximum depth of 600 mm [23.6 in.]). Each specimen was tested twice: one side was tested first under point loading, and then (after repairing) the other side was tested under either uniform loading or triangular loading. The setup allowed direct comparisons between point and distributed loading. The experimental results showed a significant influence of the type of loading and of tapered geometries on the shear strength. On the basis of these results, and using the fundamentals of the critical shear crack theory, a consistent physical explanation of the observed failure modes and differences in shear strength is provided. Also, comparisons to current design provisions (ACI318-08 and EC2) are discussed. © 2012, American Concrete Institute.
Groli G.,Polytechnic University of Mozambique |
Perez Caldentey A.,FHECOR Consulting Engineers |
Soto A.G.,FHECOR Consulting Engineers
Structural Concrete | Year: 2014
This paper presents an experimental campaign aiming to assess the cracking behaviour of flexural members made with self-compacting concrete (SCC) and reinforced with both rebars and steel fibres recycled from end-of-life tyres (ELT). The characteristics, constructability and performance of this new type of fibre are first discussed. The results of the tests carried out are then presented and discussed. The parameters that have been investigated are: φ/ρs,ef, concrete cover and fibre content. The results obtained show improvement in cracking behaviour, especially for low reinforcement ratios and large covers. Results are compared with the predictions of the recently published fib Model Code for Concrete Structures 2010. The main objective of this investigation is to evaluate the efficiency of a new type of fibre technology for crack width control of RC elements, with advantages in sustainability from the point of view of recycling and durability. Copyright © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.
Romo J.,FHECOR Consulting Engineers |
Bogle A.,HafenCity University Hamburg |
Meyboom A.,University of British Columbia
IABSE Conference, Geneva 2015: Structural Engineering: Providing Solutions to Global Challenges - Report | Year: 2015
Parametric techniques are developing as an agile tool in both civil engineering and architectural design. What is especially powerful is the ability of these softwares to relate and iterate through multiple options with minimal effort. The tools that combine a parametric definition of the bridge with a 3D graphic and a FEM model gives the designer the opportunity to analyse instantaneously, the effect in the variation of the variable parameters in terms of visual appearance as well as structural behaviour simultaneously. Therefore parametric design is a valuable tool in the conceptual design phase where the geometric decisions made are the most structurally and architecturally impactful.
Romo J.,FHECOR Consulting Engineers
Multi-Span Large Bridges - Proceedings of the International Conference on Multi-Span Large Bridges, 2015 | Year: 2015
Four Spans Cable Stayed Bridges is a particular case of multi-spans solutions. Besides the addition of extra cables it is possible to stiffen the system through the efficient use of the relationship between central span to lateral span and towers heights. Influence of deck and central pylon stiffness is analyzed for a case study. Also a parametric study carried out for a 1000 m crossing showed the importance of the ratio between lateral and central span as well as the relative height of the towers to achieve the required rigidity against unbalanced live loads. The influence of those variables and its importance in the aesthetical image of the bridge is also stated. © 2015, Taylor & Francis Group, London.