City Research Online

Rocking isolation of a typical bridge pier on spread foundation

Mergos, P.E. and Kawashima, K. (2005). Rocking isolation of a typical bridge pier on spread foundation. Journal of Earthquake Engineering, 9(Sup2), pp. 395-414. doi: 10.1142/S1363246905002456


It has been observed that after some earthquakes a number of structures resting on spread footings responded to seismic excitation by rocking on their foundation and in some cases this enabled them to avoid failure. Through application to a standard bridge supported by direct foundations, this paper discusses the major differences in response when foundation uplift is taken into consideration. Special focus is given on the modifications of rocking response under biaxial and tri-axial excitation with respect to uniaxial excitation. It is found that inelastic rocking has a significant isolation effect. It is also shown that this effect increases under biaxial excitation while it is less sensitive to the vertical component of the earthquake. Finally, parametric analyses show that the isolation effect of foundation rocking increases as the size of the footing and the yield strength of the underlying soil decreases.

Publication Type: Article
Additional Information: This is an Accepted Manuscript of an article published in Journal of Earthquake Engineering in 2005, available online:
Publisher Keywords: Bridge; pier, rocking, uplift, isolation, biaxial excitation, tri-axial excitation
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering
Date available in CRO: 29 May 2014 14:46
Date of first online publication: 2005
Download (1MB) | Preview



Downloads per month over past year

View more statistics

Actions (login required)

Admin Login Admin Login