The paper presents a continuum model for the vertical vibration of suspension bridges with a damage in the main cable. The bridge model is composed by a main cable, an Euler-Bernoulli stiffening girder and a uniform distribution of vertical hangers. The linear undamped modal eigenproperties are extracted, in closed-form, from the linearized equation of motion, thus generalizing to the presence of an arbitrary damage the expressions known from the literature for undamaged suspension bridges. A parametric analysis is also conducted with the purpose of investigating the sensitivity of natural frequencies and mode shapes to damage, which, in fact, is a crucial point concerning damage detection applications using inverse methods.
Vertical vibration of suspension bridges with damage
MATERAZZI, Annibale Luigi;UBERTINI, Filippo
2011
Abstract
The paper presents a continuum model for the vertical vibration of suspension bridges with a damage in the main cable. The bridge model is composed by a main cable, an Euler-Bernoulli stiffening girder and a uniform distribution of vertical hangers. The linear undamped modal eigenproperties are extracted, in closed-form, from the linearized equation of motion, thus generalizing to the presence of an arbitrary damage the expressions known from the literature for undamaged suspension bridges. A parametric analysis is also conducted with the purpose of investigating the sensitivity of natural frequencies and mode shapes to damage, which, in fact, is a crucial point concerning damage detection applications using inverse methods.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
