Bridge Seismic Visualization Intelligent Systems Research

Bridge is a lifeline project the earthquake damage of which is incalculable. Seismic design and evaluation of seismic performance should be done for major bridges, and its dynamic characteristics should be understood clearly. Currently structural analysis software available for dynamic analysis are numerous, such as ANSYS, NASTRAN, SAP2000, and etc. These are large general-purpose software, the users of which must have profound theoretical basis of finite element, structural dynamics knowledge and strong computer operational capabilities, and the modeling, analysis and post process of which is boring and insufferable. Specifically study on the bridge seismic analysis system, with simplifying finite element modeling process, powerful analysis functions result's visualization and easily mastered, has a great practical significance.Relying on scientific and technological project of the western traffic construction, the Ministry Communications of China-aseismic performance estimate and retrofit technology for bridges, on the basis of extensive research, with the object-oriented design principles and the bridge structure characteristics, this paper firstly studies on the overall design of the bridge seismic visualization intelligent software (Bridge Antiseismic System, BAS).On this basis, completed the interface between BAS and AutoCAD with the use of OpenDWGToolkit, the interface supports both data formats: DWG/DXF with the AutoCAD version from 2.5 to 2000; accomplished the templates of simply-supported bridge, continuous girder bridge, Rigid Bridge and the cable-stayed bridge, speeding up the modeling process; According to the project process, compiled the reading module of input data file, with an alternative to rapidly model; build the DLL link between the graphic system and the kernel analysis module, and resolved the excessive memory when reading the results; based on the finite element method, completed the kernel module with beam, truss and spring three elements, the input load pattern of which includes node load, element load , acceleration response spectrum and time history, the analysis function of which contains static analysis, modal analysis, spectrum analysis and time history analysis; applied the system to a large number of practical engineering projects, with the results comparison among BAS, SAP2000 and MIDAS/Civil, verifying the accuracy.The BAS, whose interactive graphics similar to AutoCAD, supplemented with bridge template, bridge bar assignment, seamless integration with AutoCAD and etc. provides a new tool for the bridge seismic analysis.