The Finite Element Methods For Antiseismic Analysis Of Thin- Walled Bar Structures With Open Profile

With the development and progress of engineering technology, thin-walled bar structures with open profile are widely used in bridge engineering, ocean engineering, high-building, aviation industry and machine equipment such as automobile and agricultural machinery. Because of the requirement of practical engineering, it is more important to do the research within dynamic response of dynamic loading and dynamic response of earthquake loading about thin-walled bar structures with open profile. Because of the limit of experiment condition, the numerical methods become more significant. In this paper, the one-dimensional discrete finite element methods of dynamic response of dynamic loading and dynamic response of earthquake loading about thin-walled bar structures with open profile are build according to the basic theory and Vlasov theory of thin-walled bar structures.In this paper, the calculation models in one-dimensional discrete finite element methods about analysis of the thin-walled bar structures with open profile restrained torsion and flexural and torsional analysis of thin-walled bar structures with open profile including the effect of shear-lag are build according to Hamilton theory, Vlasov theory and hypothesis, and the dynamic response under harmonic loads is solved according to mode - superposition methods. At last, the F90 programs are created to calculate the frequencies, model-shapes and the amplitude value of vibration displacements under harmonic loads.In this paper, the calculation model in one-dimensional discrete finite element methods about analysis of the thin-walled bar structures with open profile under earthquake loads is build according to mode - superposition response spectrum method and time history method. At last, the F90 program is created to calculate the frequencies, model-shapes, the most obvious earthquake effect and the response curves with time about nodes' speed and acceleration in order to offer basis for structures' seismic design.Compared with common finite element methods, one-dimensional finite element methods discrete less elements, simpler data preparation, more memory saving, better result and higher efficiency of calculation.