4.0 Prediction of Load Effects for Strength Design and Serviceability

4.1 Structural Properties of the Building

For the prediction of a building’s dynamic response at various wind speeds and directions, it is necessary to know the natural modes of vibration of the structure, including the natural frequencies and modal deflection shapes. It is also necessary to know the damping in each mode. The natural frequencies and mode shapes may be computed using a number of available commercial finite element software packages. However, the results will be influenced by the assumptions made when developing the finite element model.

For the purpose of determining the dynamic response to wind loading, it is important to be aware that, in general, lower frequencies ...

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