The Earthquake Engineering Online Archive

Determination of seismic design criteria for the Dumbarton Bridge replacement structure, Vol. 2: Numerical studies and establishment of seismic design criteria

Baron, Frank; Pang, Shui-Hin

UCB/EERC-75/02, Earthquake Engineering Research Center, University of California, Berkeley, 1975-02, 186 pages (630/B31/1975/v.2)

This report, published in two volumes, deals with the first phase of an extensive seismic investigation that is being made of a long multispan bridge proposed for a crossing of the lower arm of the San Francisco Bay. In this phase, a preliminary design is investigated and a set of seismic design criteria are established. The bridge is 7400 ft long and is composed of 43 spans founded on various soil conditions, including thick-mud and deep-water sections. Parametric studies are performed (a) to determine and explore the critical questions of design, (b) to define the parameters that need to be considered in the analyses, and (c) to establish seismic design criteria for the final phase of design. Among the parameters studied are those associated with five different earthquakes, two soil columns, the interaction of the various footings and piling groups with varying water and soil conditions, and the properties of the structural elements along the bridge. Based on these studies, seismic design criteria are established in the form of design spectra for both strong and moderately strong earthquake motions. For Volume 1, see the report, entitled "Determination of seismic design criteria for the Dumbarton Bridge replacement structure, Vol. 1: Description, theory, and analytical modeling of bridge and parameters," by Baron and Pang, UCB/EERC-75/01, published Feb. 1975.

Available online: http://nisee.berkeley.edu/documents/EERC/EERC-75-02.pdf (13 MB)