The Earthquake Engineering Online ArchiveDesign and evaluation of reinforced concrete bridges for seismic resistanceAschheim, Mark A.; Moehle, Jack P.; Mahin, Stephen A. UCB/EERC-97/04, Earthquake Engineering Research Center, University of California, Berkeley, 1997-03, 196 pages (630/A77/1997) Seismic design approaches for reinforced concrete bridges are reviewed, and uncertainties in seismic design and evaluation are discussed. The modeling of bridge components and systems is discussed, and analytical studies of the response of series of simple bridges are made. The relative utility of several design approaches and stiffness assumptions for controlling seismic demands is assessed. Modeling of column and wall pier flexural and shear strengths is examined in detail, and available models for the inelastic shear strength of columns are compared with test data. Displacement-based design approaches are shown to be effective for controlling displacement ductility demands. Relations are presented for modeling columns common in California bridge construction. Effective stiffness is defined, and the variation of effective stiffness with axial load ratio and longitudinal reinforcement is presented. Expressions for the variation of nominal flexural strength and effective stiffness with longitudinal reinforcement content are provided for a column with axial load equal to 0.05A subscript g f subscript c'. A simple trilinear representation of the analytically derived moment-displacement is presented for such columns; the trilinear representation can be constructed using simple expressions that make use of quantities readily available to the practitioner. Available online: http://nisee.berkeley.edu/documents/EERC/EERC-97-04.pdf (8 MB) |
