scholarly journals Structural behaviour and design criteria of under-deck cable-stayed bridges subjected to seismic action

2012 ◽  
Vol 42 (6) ◽  
pp. 891-912 ◽  
Author(s):  
Alfredo Camara ◽  
Ana M. Ruiz-Teran ◽  
Peter J. Stafford
Keyword(s):  
Design Criteria ◽  
Seismic Action ◽  
Structural Behaviour ◽  
Cable Stayed Bridges

scholarly journals Structural behaviour and design criteria of under-deck cable-stayed bridges and combined cable-stayed bridges. Part 2: Multispan bridges.

2008 ◽  
Vol 35 (9) ◽  
pp. 951-962 ◽  
Author(s):  
A. M. Ruiz-Teran ◽  
A. C. Aparicio
Keyword(s):  
Prestressed Concrete ◽  
Design Criteria ◽  
Live Load ◽  
Structural Behaviour ◽  
Structural Efficiency ◽  
Stay Cables ◽  
Medium Length ◽  
Permanent Load ◽  
Materials Used ◽  
Cable Stayed Bridges

This paper deals with the application of under-deck cable-staying systems and combined cable-staying systems to prestressed concrete road bridges with multiple spans of medium length. Schemes using under-deck cable-staying systems are not suitable for continuous bridges, as they are not efficient under traffic live load and only allow for the compensation of permanent load. However, combined cable-staying systems are very efficient for continuous bridges and enable the design of very slender decks (1/100th of span) where the amount of materials used is halved in comparison with conventional schemes without stay cables. In this paper, the substantial advantages provided by combined cable-staying systems for continuous bridges (such as high structural efficiency, varied construction possibilities, both economic and aesthetical benefits, and landscape integration) are set out. Finally, design criteria are included.

scholarly journals Structural behaviour and design criteria of under-deck cable-stayed bridges and combined cable-stayed bridges. Part 1: Single-span bridges

2008 ◽  
Vol 35 (9) ◽  
pp. 938-950 ◽  
Author(s):  
A. M. Ruiz-Teran ◽  
A. C. Aparicio
Keyword(s):  
Prestressed Concrete ◽  
Design Criteria ◽  
Structural Behaviour ◽  
Research Project ◽  
Structural Efficiency ◽  
Stay Cables ◽  
Extensive Collection ◽  
Materials Used ◽  
Very High ◽  
Cable Stayed Bridges

This paper examines two new types of bridges, namely under-deck cable-stayed bridges and combined cable-stayed bridges, for prestressed concrete road bridges with single-spans of medium length. Both bridge types offer many advantages over conventional schemes in several aspects, such as structural efficiency, enhanced construction possibilities, and both economic and aesthetical considerations. They are very slender structural types with a very high structural efficiency, for which the materials used in the deck are reduced to one third of that in conventional bridges without stay cables. In this paper, the most important aspects of the structural behaviour of these bridge types are set out through the description of a careful selection from an extensive collection of bridges designed and analysed by the authors in a previous research project. In addition, a detailed set of design criteria for these bridge types is presented, based on the results of the extensive parametric study undertaken in the aforementioned research project.

Optimization of concrete cable-stayed bridges under seismic action

2019 ◽  
Vol 222 ◽  
pp. 36-47 ◽  
Author(s):  
Alberto M.B. Martins ◽  
Luís M.C. Simões ◽  
João H.J.O. Negrão
Keyword(s):  
Seismic Action ◽  
Cable Stayed Bridges

scholarly journals Parameters governing the response of under-deck cable-stayed bridges

2007 ◽  
Vol 34 (8) ◽  
pp. 1016-1024 ◽  
Author(s):  
A M Ruiz-Teran ◽  
A C Aparicio
Keyword(s):  
Design Criteria ◽  
Live Load ◽  
Quarter Century ◽  
The Past ◽  
Highly Efficient ◽  
Cable Stayed Bridges

In the past quarter century, a number of bridges have been built that do not fit into the conventional types of cable-stayed bridges. These are under-deck cable-stayed bridges and combined cable-stayed bridges. In this paper we define the first of these two types and set out its mechanisms of response. We then establish and analyze the parameters that determine the permanent response and the response to live load of these bridges. Lastly, we draw conclusions relating to their behaviour and define design criteria for them with the aim of making cable-staying systems highly efficient and allowing the design of much lighter and slimmer structures.Key words: unconventional cable-stayed bridges, under-deck cable-stayed bridges, combined cable-stayed bridges.

scholarly journals Seismic retrofitting of masonry vault using CFRP

Alternativas ◽  
2017 ◽  
Vol 17 (3) ◽  
pp. 15-23
Author(s):  
Laura Anania ◽  
Antonio Badalà ◽  
Giuseppe D’agata
Keyword(s):  
Shear Strength ◽  
Shear Failure ◽  
Flexural Rigidity ◽  
Seismic Retrofitting ◽  
Experimental Point ◽  
Seismic Action ◽  
Structural Behaviour ◽  
Concrete Core ◽  
Mortar Joint ◽  
Incremental Step

Masonry vaults represent one of the most seismic vulnerable element in an ancient building. It also generally does not possess an adequate capability of redistribution of the seismic action among the walls of the buildings. In this paper, the structural behaviour of a masonry barrel vault strengthened by a new technology in applying Carbon Fiber Reinforced Polymer (C-FRP) is discussed from both theoretical and experimental point of view. The C-FRP is applied such as to assume an Ω shape around a concrete core realized at the vault extrados. This arrangement allows the resulting CFRP reinforced ribbed vault to assume the necessary strength and membranal and flexural rigidity so as to ensure the aforementioned seismic action redistribution capability and to avoid local collapse of the vault. A theoretical prediction of ultimate strength was derived in agreement with the occurrences observed during the experiments (masonry crushing, FRP rupture, debonding, sliding along the mortar joint). To this aim, a novel incremental step-by-step lower bound limit analysis approach was developed taking into account for the shear failure mechanism at each mortar joint. The shear strength is evaluated by the Mohr-Coulomb friction law for the mortar joint and by other nonlinear Italian Code relations for CFRP Ω-Wrap reinforcement. In the approximated incremental analysis process the current value of the shear strength, depend on the compressive stress resulting from the previous step.

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