| Displacement-based seismic design (DBSD) is an effective way to realize the philosophy of performance-based design (PBSD) , which has received increasing attention. This paper studies the DBSD method of the SDOF system and longitudinal direction of continuous girder bridge, then designs the two systems with DBSD method and Force-based seismic design (FBSD) method, and then compares the results.The main contents are as follows:(1) Such aspects of research are reviewed as FBSD method, PBSD Philosophy and DBSD procedures, based on the comprehensive reading and understanding of related literature home and abroad.(2) The displacement capacity of the circular column is introduced, the displacement demand under the earthquake is studied, and the relations of the displacement demands and capacities with longitudinal steel ratio are studied. An example is given which is designed with Kowalsky method, and the result is compared with the results of nonlinear time history method.(3) Piers with different heights, diameters, and axial load ratios are designed with both FBSD method and DBSD method, and then the results are compared.(4) The displacement demands of symmetric and asymmetric continuous girder bridges in longitudinal direction are studied, and then a DBSD method is proposed, an example is given.(5) Continuous girder bridges with different design diameters are designed in longitudinal direction with both FBSD method and DBSD method, and their results are compared. |
