Facade Systems Modal Analysis in Consideration its Own Dynamic Characteristics of the Frame

Строительные конструкции, здания и сооружения

This article studies the degree of the wind load dynamic component influence on the bearing capacity of the hinged ventilated facade systems (HFS) of a high-rise building. The research model is a reinforced concrete building with a HFS with variable number of storeys and with constant dimensions and identical floor plans over the entire height. As a design of the HFS, a scheme based on the T-profile with a step of brackets of 600 mm vertically and a pitch of guide racks of 500 mm horizontally is adopted. The number of storeys is taken as a variable parameter of the research model. The following tasks were solved in the work: determination of the natural frequencies of the HFS as a multi-span beam; determination of natural vibration frequencies of the facade systems together with a reinforced concrete building, determination of dynamic factors, and comparison of the obtained values. As a result of the work, it was shown that when determining the bearing capacity of the HFS of a high rise building, it is impossible to consider the facade system as a separate structure from the building. A methodology for modal analysis is proposed, which allows determining refined values of the natural frequencies of a substructure vibration and dynamic factor.