E-Bülten Aboneliği
CMP 2022
Tevfik Seno Arda Lisesi
Yayınlar > Çelik Yapılar
Sayı: 68 - Ocak / Şubat 2021



Authors: Arman Akdoğan, Master Architect Sükan Külekçi, Msc.Structural Engineer & İbrahim Çelik, Business Development Specialist

Radio and broadcast towers are symbols of both video and progress, enabling the communication and sharing of ideas and emotions; just like the totems left to us from civilizations that speak and speak about progress and humanity's interconnectedness.

At the threshold of the 21st century, we are entering a new phase of modernization. Pure functionality is no longer enough. Comfort and emotional experience have gone beyond technical competence and become the driving forces that guide our lives. Thus, we now have the chance to rethink the way we experience technology and nature in a new century.
The Çanakkale Antenna project offers us a series of new and interesting paradoxes. How can the experience of nature be improved by adding technology? Can an attractive visitor experience be possible by using the height of the antenna tower while protecting the visitors from the radiation hazards of the transmitters? How is an icon designed that brings together all the qualities of the field and experiences them as a comprehensive whole? How can visitors meet in a universal language by incorporating the unique local qualities of Çanakkale into the design and nurturing a technological totem vital elements?

The new Çanakkale Antenna Tower resolves all these paradoxes by combining different functions and spatial requirements in a single spatial area with its unique design. A path that turns around the area integrates with the striking texture of pine trees, offers panoramic views from all directions, the visitor center rising above the trees merges with the walkway and turns to the top of the hill and meets the sky. On the hill, the forest turns into a continuous and uninterrupted landscape and an attractive garden opens into the interior of the area.

The design clearly separates the visitor center from the antenna tower so that visitors and employees are not exposed to any radiation hazard. At the same time, you can enjoy the city view, Gallipoli, Dardanelles and pine trees with a 360-degree platform above the trees. In this way, the antenna tower remains modest and lean, while being adaptable to future technological changes. The functionality of the antenna tower is separated from the visitor center, as the technical rooms are located close to the tower and the road.

The antenna tower is formed by joining two vertical roads and offers an elegant passage for visitors to enter the premises. The strong visual identity created by this movement allows for a detailed view when viewed closely, and an elegant iconic appearance is perceived as you move away from the tower.
The tower part is the most sensitive part of the project with its height up to 95m. Due to the high sensitivity of such tower systems, resonance and excessive vibration problems may occur under wind loads. For this purpose, the vibration frequencies of the front wind were calculated and the system periods were controlled. As a result of the analysis, it has been observed that if the dominant vibration frequency of the tower is greater than 0.5Hz, negative effects caused by wind will be prevented. As shown in the figures below, preliminary analyzes were performed and it was found that the frequencies were appropriate.

Detailed calculations were started after the system geometry and cross section types were determined as a result of preliminary calculations. It is especially important to evaluate the superstructure and ground behavior together in these types of high-rise structures. For this purpose, soil parameters were evaluated by İntaç engineers and it was determined that there was a piled foundation requirement. Afterwards, the analysis of the structure-ground interacting finite element model was established. While creating the building-ground interactive model, the piles are modeled under the tower foundations as structural elements and the ground effect is represented with appropriate parameters.

The area where the building is located is not only open to high wind loads, but also an earthquake zone. In order to ensure that the structure is also resistant to the expected high earthquake loads, a Site-Specific Seismic Risk Analysis study was conducted for the antenna tower, and the specific effect of a possible earthquake in this region was obtained. Since the current regulations do not specify to what extent the earthquake loads will be reduced for such structures, nonlinear calculations were made and the earthquake load reduction coefficients were calculated first. Afterwards, design spectra were obtained by determining the structure-specific dampers. In the last step, earthquake loads were calculated based on all this information and the system was dimensioned accordingly. While making detail sizing, results were obtained both with comparative solutions made with finite elements and manual level controls. 

At every stage, steps have been taken by considering applicability, economy and safety factors and the design has been finalized. Since the building is at the seaside, corten steel has been used as the structural steel in order to prevent the corrosion effect that will occur on the surface of the building over time and at the same time to have a natural appearance. This steel shows high resistance to weather conditions. In short, it can be called “rusted” or “rusted” steel. The most widely known of these steels is the specially produced steel metal developed by COR-TEN American USX Corporation. It can also be called “Antique Steel”. If exposed to weather conditions for a few years, it naturally rust, forming a special layer like rust patina, and the worn appearance turns into a special interest area for artists and designer architects working with steel fabrications in private constructions.

CORTEN Steel Coating has its own unique color. With this choice, the bold coating of “rusty steel” on almost all sides of the entire building will create a striking color and effect.
Çelik Yapılar - Sayı: 68 - Ocak / Şubat 2021

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