ABSTRACT
More advanced design philosophy, “Displacement-Based” design procedure, is specied in LRFD SBD (AASHTO, 2011). e objective of this approach is to ensure that the bridge structure system and its components have enough displacement capacity to withstand the deformation imposed by the design earthquake. Using displacements rather than forces as a measurement of earthquake damage allows a structure to fulll the required functions. In a displacement-based seismic design, the rst step is to check the proportion requirements for bridge components and congurations based on the balanced strength and stiness criteria. en the displacement demand, ΔD, is calculated through the appropriate seismic evaluation procedure. However, the displacement capacity, ΔC, is estimated by inelastic static pushover analysis. e design criterion is set as ΔD/ΔC < 1.0. e design procedure is shown in Figure 8.3.
