| Since the21st century, with the observation of strong earthquake records and the developmentof seismic technology, the theory of bridge seismic has been greatly developed, bridgeseismic design specifications of each countries are constantly updated and improved. For thedifferent factors,such as environmental conditions and national economy，the bridge seismiccodes are different from country to country, even as an independent system. However, each ofseismic code is constantly absorb and draw lessons from other countries advanced designconcept to be updated and improved. Compared with the United States, Europe, Japan,our bridge seismic code is not mature enough, especially the ductility design and seismicisolation design, our code is less involved for the content. Thought the whole comparativeanalysis of the bridge seismic code andthe detailedly analysis of the parameter involved inthe code for the United States, Europe, Japan and China, this paper gives some suggestion forthe content is not covered and the parameter values is considering shortage in ourcountry’s seismic code and provide some reference for the amendment and improvement ofour code. The main accomplished works of the paper are as follows:1. Introduce the basic theory of bridge seismic design, including the form of bridgedamaged by an earthquake, influencing factors, failure criterion, the ground motion input,structural seismic vibration equation, dynamic characteristics of structurethe and seismicresponse analysis method, etc, the response spectrum analysis method of bridge seismicdesign is discussed, briefly describes the static method and time history analysis method.2. Compare with the seismic fortification goal, fortification standards and bridgehierarchies, analyzes the difference of seismic fortification standard of four specifications.3. Analysis the difference of seismic zonation,compartmentalized criterion of sitecategory, design response spectrum and damping correction coefficient involved in designseismic parameters for the four countries’ codes, put forward relevant Suggestions for theconcept of "intensity" of our country, and contrast the difference of the damping correctioncoefficient value in detail.4. Compare the differencement with seismic response analysis method, the loadcombination,modal combination of response spectrum method, combination of seismicaction,modeling principles,ect.5. Compare the content of ductility design of four specification,aim at the comprehensiveinfluence coefficien is used in our country code and the ductility coefficient is used in othercountries codes，put forward related Suggestions, and summarized plastic hinge length andcountries reinforcement ratio values. 6. Compare with application conditions and parameter values for the seismic isolationdesign of four specification, analyze change rules of the equivalent stiffness and equivalentdamping ratio of isolation bearing.7. Simulate the real bridge engineering by the finite element analysis software, analysisthe impact of pile-soil interaction on the structural modal and seismic response values. |
