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NOISE, VIBRATION & FREQUENCY: EXTREME CONSTRUCTION


Taking CFD to extremes


Jonathan Newell talks to engineering design company Newtecnic about analysing vibration in a new 356m high television tower in Turkey


U


K building engineering design company Newtecnic believes in taking things to extremes, which is exactly what it has achieved with its innovativemodular


façade systemfor Turkey’s latest showcase architectural project, the 356mtall Küçük Çamlıca TV (KCTV) tower in Istanbul. Set to be an iconic landmark, when


complete the £36million KCTV tower will clean up the Istanbul skyline by incorporating over 100 broadcasting transmitters,many of which are polluting the existing skyline. The tower is expected to attract 4.5million visitors a year and incorporates restaurants, exhibition and meeting spaces, two high-level observation decks and a panoramic elevator. Such an important and innovative


structure required careful attention to every detail fromthe start and Newtecnic applied its innovationmethodology of


using academic peer reviews, advanced CFD software for airflow analysis and the latest 3D printing technology for prototyping to develop a façade concept that would enable inhabitable spaces to be created along the whole length of the tower core rather than just at the top. To find outmore about Newtecnic’s role


in the tower’s design and the tools they use to ensure the safety of such a structure, I spoke to CEO AndrewWatts and chief associate engineer, Rosen Kunchev.


STRUCTURAL INNOVATION According toWatts, towers of such height usually only have accommodation at the top because of the complexity and the building costs. “Using specially developed algorithms, we devised a design that allows lightweight pre-fabricated glass reinforced concrete (GRC) panels to be attached all the way up the central column. These hang


 Tethered drones take maintenance tasks to extremes to service the giant KCTV tower


like a curtain and are securely clipped to themain central core to create large interior spaces,” he says. Understanding the behaviour of the


structure was a crucial part of the design process, especially considering that when complete, the tower will sit on an exposed hill and reach 580mabove sea level.Wind tunnel testing helped and allowed Newtecnic to develop accurately sized façade components fromthe first stage studies. It also provided the data to optimise the envelope build-up and obtain an accurate understanding of the impact the façade loads will have on the behaviour of the concrete structure. According toWatts, the envelope system


was designed tominimise installation time and uses an innovativemethod that integrates thin GRC rainscreen panels, stiffened by a steel frame, which is fixed directly to a backing wall that incorporates integrated glazed openings.


PREVAILING FORCE Building such a tower on an exposed hill in a region which has a history of seismic activity presents unique design challenges. I asked Kunchev how different combinations of forces acting on the structure are accounted for and simulated. He toldme that seismic forces, wind


loads and self-weight are all evaluated at the very first stages to determine which force prevails. “Once this is understood, it is applied to all aspects of the design including the detail. Themodels go up and down the detailed bill ofmaterials and even down as far as determining how the façade seals work,” he explains. He adds that although different


considerations are taken into account for themain structure and the façades, both seismic and wind loads aremodelled individually and together to understand the load combinations on the structure. In the case of the KCTV tower, wind


forces considerably outweigh seismic loads. “Wind prevails in this design and although seismic forces are a factor, they are less relevant in this case,” explains Kunchev.


A NEW APPROACH Using innovative design ideas in extreme buildings has its drawbacks, not least of which is the consequence of catastrophic failure, something which instils a certain level of fear within the construction industry. I asked how the company worked to overcome this constraint. Watts explained that generally, the


 October 2017 /// Environmental Engineering /// 31


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