Calculating Steel Bridge Spans on Earthquake Loads
Calculating Steel Bridge Spans on Earthquake Loads

Calculating Steel Bridge Spans on Earthquake Loads

Authors:  

Van Haybin
канд. техн. наук, инженер, Китайская нженерная железнодорожная корпорация «Эр Юань» (Москва)

Vorobyova K.V.
St. Petersburg State Transport University, engineer

Guan Yonghai
Ph.d.

Смирнова Любовь Николаевна Smirnova Lyubov N.,
Cand. Sci. (Engineering), Scientific secretary of JSC RCC. Moscow, Russian Federation


Rubric:     Theoretical and experimental studies   
Annotation:
It is shown that in many cases while calculating bridge spans it is necessary to take into account the soil-structure interaction. If the pier is higher than 5 m, energy dissipation for the main oscillation mode is determined substantially by energy losses, caused by wave propagation in the soil base, thereby the dynamic ratio drops significantly. Furthermore, if a bridge span is shorter than 55 m and the base modulus of deformation Eo < 30 MPa, the force in the piers can be determined by the second mode, for which the superstructure and piers oscillate in antiphase. For bridges with spans over 80 m long at Eo > 30 MPa, seismic forces for spans and piers are determined by the first oscillation mode. 

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