Structural Calculation of Aluminium Curtain Wall (Theoretical and on Karamba Grasshopper Plugin )

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Facade Structural Design & Analysis Avinash Vijayakumar Nair Masters in Facade Design Technische Hochschule Ostwestfalen Lippe avinash.nair@stud.th-owl.de Guided by Prof J. Schulz and Prof T. Vierra

Abstract - The façade technology can be characterized by the detachment of the massive brick wall into a separation of structure and façade. In this facade has an important role considering overall asthetics and the sustainability of the entire building. The double-skin facade system is a system that consists of two building skins separated by a ventilated cavity. The main purpose of the double skin facade in this project is to adapt to ambient conditions and balance out the lighting inside the building using automated triangular louvers which is adjusted after studying the effect of sun-path on the entire building through-out the year.

Curtain walls separate the interior from the exterior, but only support their own weight and the loads imposed on them (such as wind loads, dead loads, and so on) which they transfer back to the primary structure of the building. This is in contrast to many forms of traditional construction in which the external walls are a fundamental part of the primary structure of the building.

The project of office building in Herford is a refurbishment project for which the facade design was developed after studying the requirements as per the site location. The windload and the dead-load calculations are carried out as per the EN norms on basis of which the profiles and reinforcements selected for the building. This facade structure was also created on the Rhinoceres software for which the structural deformation and utilization was calculated using Karamba 3D plugin. The result is compared for the critical condition for which the considered profiles specification are under permissible deflection limits.

The double-skin façade is a system that consists of two building skins separated by a ventilated cavity. The main aim of the cavity is to vary the physical properties of the façade throughout the year, improving the building’s performance. Between the heat-insulated inner façade and the outer skin is an unheated thermal buffer zone, which is ventilated if required and can incorporate movable solar shading devices. Double-skin façades are designed to adapt to ambient conditions and balance out seasonal climate fluctuations. Thus heat, coldness, light and wind are regulated to attain optimum comfort without any complex technology or use of energy. Sometimes the heat energy that builds up in the cavity is used not just passively but also actively.

Keywords: Double-Skin Facade, Mullion, Transom, Louvers, Reinforcement, Deflection, Moment of Inertia. A. INTRODUCTION Curtain wall systems are non-structural cladding systems for the external walls of buildings. They are generally associated with large, multi-storey buildings.

Typically curtain wall systems comprise a lightweight aluminium frame onto which glazed or opaque infill panels can be fixed. These infill panels are often described as ‘glazing’ whether or not they are made of glass.

The requirement of this project is to create a facade concept for the refurbishment of the Herford Office building considering the surrounding conditions and the climatic conditions on the building. The type of facade created is a double-skin facade with automated louvers mounted on the second skin. The main objective is to carry out the structural calculations for the main structure manually and also on the software to have a safety assement of the facade design on the structure.

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Structural Calculation of Aluminium Curtain Wall (Theoretical and on Karamba Grasshopper Plugin ) by Avinash Nair - Issuu