Cable Stayed Bridges

With over 50 years of experience in the field of specialized engineering, Tensa is leader in the design, production and installation of systems and special components for the construction of cable stayed bridges

Advantages

TENSA technologies, widely applied in cable stayed bridges, are meant to:

- Increase concrete and steel structure performances by strengthening them and, consequently, allowing for big spans to be reached (post tensioning and stay cables)

- Transfer vertical and horizontal loads and allow deck structural movements and rotations (bearings and expansion joints)

- Protect structures from the seismic action or, in general, from dynamic actions (i.e. wind)

 

GROUND ANCHORS

The technology of ground anchoring is widely used especially as far as slope consolidation and retaining walls are adopted.

At this location, bearings, isolators, elasto-plastic devices, dampers and shock transmitter devices can be installed. Sometimes the design prescribes the use of post tensioning along the trunk of the column to give compression and reduce instability.

BEARINGS

Structures, indeed, undergo displacements, rotations and deformations caused by acting loads (of static, dynamic, thermic nature etc.) or by phenomena such as shrinkage and creep, linked to the maturation of materials.

Movements, rotations and deformations need to be allowed for and contemplated where strictly necessary and in accordance with the designer’s constraining system. The following types of bearings can be supplied:

  1. Fixed bearings, which allow rotation between two structural elements and transfer vertical and horizontal loads
  2. Guided sliding bearings, which transfer vertical loads, allow rotation between two structural elements, displacement in one single direction and transfer lateral load in the fixed one
  3. Free sliding bearings, which transfer vertical loads, allow rotation between two structural elements and displacements in all plan directions
ISOLATORS

Base seismic isolation represents an important tool in the hands of the designers to protect the structural and non-structural components of a construction, not to mention protecting human lives. The isolators limit the acceleration transferred to the structure and reduce inertial stress by increasing the oscillation period.

DAMPERS

Dampers are hydraulic devices depending on load application velocity and are able to dissipate part of the dynamic energy entering into the structure.

SHOCK TRANSMITTERS

STU are hydraulic devices able to create, only for impulsive external force, a temporary rigid connection between two parts of the structure.

POST TENSIONING

The TENSA post tensioning systems are meant to give compression stresses to concrete using post tensioning tendons made of steel strands or steel bars.

DECK

Decks are currently built with reinforced concrete, steel or composite structures. Post tensioning is a highly efficient structural strengthening system both for concrete and also steel decks that can be used for cable stayed bridges adding its effect to the one given by stay cables (stays are used to connect pylons to deck, allowing a considerable increase of span length).

Expansion joints are devices designed to absorb the movements of the structure due to temperature variations, creep, shrinkage, seismic actions and wind, to allow continuous traffic between the decks and among deck and abutments offering a safe and comfortable passage

PYLONS

In cable stayed bridges, concrete pylons are often reinforced with post tensioning for both adding compression in vertical direction and increasing horizontal shear forces induced from the cable stays.In cable stayed bridges, concrete pylons are often reinforced with post tensioning for both adding compression in vertical direction and increasing horizontal shear forces induced from the cable stays.

Related products 

30 years’ experience, more than 50 worldwide applications, continuous improvement and innovation have allowed TENSA to stay at the forefront of the stay cables technology, continuously releasing new and customized solutions for its clients.

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TENSA offers a complete range of bearings. Almost 30 years of worldwide experience in the field allows TENSA to provide the most appropriate solution to meet all clients' needs. The internal production facility and laboratory allow to keep full control of quality and of delivery times.

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Thanks to its experienced team of engineers and technicians, TENSA is able to guarantee the highest and worldwide accepted quality standards to every step of the post tensioning process, from the design, to production and on-site installation.

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Almost 50 years of worldwide experience in the field allow TENSA to provide customized solutions to meet all the clients' needs. TENSA’s ground anchors are developed within an overall improvement program including anchors and post-tensioning products.

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TENSA designs and provides different types of expansion joints, which can be used in any structure. TENSA's joints are capable to absorb the structure movements caused by temperature variations, creep, shrinkage, seismic actions, from the smallest to the largest.

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Base isolation systems are used to protect constructions and, more importantly, human lives.  25 years’ experience allows TENSA to provide a solution to any design demand, producing innovative tools aimed at reducing the seismic hazard.

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TENSA designs, produces, tests and delivers its velocity dependent devices according to specific clients’ needs. These solutions are designed to reduce the seismic structural response by adding important energy dissipation to the system.

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TENSA’s rigid connection devices are the most suitable solution when a modification on the structure’s response is required. In fact, they can modify the structure’s condition from static to dynamic and distribute the entrance seismic force in different positions.

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Thanks to its high quality displacement dependent devices TENSA is able to guarantee a perfect control of maximum loads activated during an earthquake between the connected elements, independently of the seismic intensity and frequency.

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