Structure Period Record For Free

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All buildings have a natural period, or resonance, which is the number of seconds it takes for the building to naturally vibrate back and forth. The ground also has a specific resonant frequency. Hard bedrock has higher frequencies softer sediments.
Depending on mass and stiffness, the fundamental period is a global characteristic describing the behavior of building under seismic loads. For this reason, it is easily and directly usable to determinate the global demands on a structure due to a given seismic input.
Natural period of a thing refers to its intrinsic property i.e. time period of vibrating at a specific frequency which is based on the mass as well as the stiffness of the thing. So e.g. if you hold a steel foot ruler firmly from one end and hit it on at the other end, it will start to vibrate at a specific frequency.
Natural frequency is the frequency at which a structure vibrates when excited by a transient load or when left undisturbed.
The time taken (in seconds) for each complete cycle of oscillation (i.e., one complete back-and-forth motion) is the same and is called Fundamental Natural Period T of the building.
Buildings oscillate during earthquake shaking. Natural Period Tn of a building is the time taken by it to undergo one complete cycle of oscillation. It is an inherent property of a building controlled by its mass m and stiffness k. These three quantities are related by its units are seconds (s).
When the ground shakes, the base of a building moves with the ground, and the building swings back- and-forth. The time taken (in seconds) for each complete cycle of oscillation (i.e., one complete back-and-forth motion) is the same and is called Fundamental Natural Period T of the building.
Frequency is inversely proportional to time period. SI unit of time period is second while frequency is per second or second^-1. Time period is the time taken to complete a cycle of any function while frequency is the number of times a cycle is completed each second.
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