Periods of Vibration for Displacement-Based Assessment of RC Buildings

[Veggeta]

Periods of Vibration for Displacement-Based Assessment of RC Buildings

ABSTRACT

Simple empirical relationships area available inmany design codes to relate the height of a building to its fundamental period of vibration. These relationships have been realized for force-based design and so produce conservative estimates of period such that the lateral shear force will be conservatively predicted from an accelaration spectrum. Where assessment of a structure is concerned, it is the displacement demand that gives an indication of the damage that can be expected, this displacement would be underestimated with the use of the afermentioned period-height formulae. Furthermore, the period of vibration of interest in assessment is the yield period, which is calculated using the yield stiffness, also often referred to as the cracked or elastic stiffness.

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[kowheng]

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