pedestrian bridge natural frequency
pedestrian bridge natural frequency
(OP)
does anybody can help me? I need to perform a dynamic analysis of a pedestrian bridge: 50 m single span. It is a steel structure with a concrete deck...anyone knows a formula to calculate the natural frequency? thanks a lot






RE: pedestrian bridge natural frequency
These days you are probably better off using an FE model, which are occasionally quite accurate.
Cheers
Greg Locock
RE: pedestrian bridge natural frequency
RE: pedestrian bridge natural frequency
Stress, Strain and Structural Matrices
Pilkey
Wiley Interscience 1994
For pinned-pinned support and uniform beam
fi=[landai^2*sqrt(EI/ro)]/[2*pi*L^2]
fi natural frequency for i mode, result is in Hz
landai=i*pi
pi=3.14
L=span
ro= mass per unit length
RE: pedestrian bridge natural frequency
f = 16/sqrt(d)
where f = frequency in Hertz
d = maximum self-weight deflection (at 1.0 g)
If you want the frequency for lateral vibration, then simply analyse the structure for gravity in a different direction.
Cheers
RHK
Russell Keays