1 research outputs found
Un enfoque de bajo costo para monitorear la salud estructural de los puentes peatonales
Changes in dynamic properties of structures, such as
damping ratios and natural frequencies can be
detected by periodic monitoring (e.g. one time by
year). These changes are often indications of
structural damage thereby, the maintenance or
demolition of the structure can be doing in due time.
In the case of pedestrian bridges, people’s
movements may produce a resonance state, which
leads to excessive deflection that accelerates the
deterioration of these structures. Typically, these
dynamic properties are detected by using high-cost
vibration measurement equipment to achieve high
levels of precision (i.e. a very low noise levels). This
article studies the measurement of dynamic
properties in pedestrian bridges using a tri-axial
accelerometer integrated into a mobile phone as a
low-cost and alternative practice. Accelerations were
recorded on a steel pedestrian bridge (flexible) and on
a post-tensioned concrete pedestrian bridge (rigid)
located in Barranquilla City (Colombia). Vibrations
were induced by a person (e.g., by jumping). Previous
studies based on traditional measuring techniques
show that two dominant frequencies in both types of
bridges can be identified. However, in this study a
reliable damping ratio could only be established for
the steel bridge that it is associated with the flexibility
and the low amplitude of the induced vibrations by a
single pedestrian use