Dynamic Reaction Analysis Of Arch Bridge Under Muti-dimensions And Muti-point Sesmic Excitation

The arch bridge upper construction mainly suffer pressure, so we can make use of the anti- pull capability worse but the anti- presses capability good mason (the stone, concrete, brick etc.) to construct arch bridge, people like arch bridge for its economy and beauty. The characteristics of the arch bridge construction form decide its reaction to the earthquake intelligently, but the current anti-earthquake theories of arch bridge is still limited by the analysis of horizontal consistent earthquake. muti-dimensions and muti-point sesmic need research This text aim is studying the characteristics of arch bridge under muti-dimensions and muti-point sesmic input,and provide theories for arch bridge's design of anti- earthquake.Aiming at the current arch bridge classify every kind anti-earthquake system of arch bridge, and study the structural characteristics and capability in every kind of arch bridge,and put forward the method of construct model.For studying the capability of arch bridge construction on multi-components and multi-support earthquake excitation, this text compiled space FEM program by large mathematics software MATLAB language.The program adopt Newmark β number solution method and make use of eig founction provided in the method to obtain the characteristic value.The programe is verified by the the large general FEM software ANSYS, the program adopt the space beam element which considers to shear deform and space pole element.Dynamic model is proposed by considering the difference of rotational and horizontal component excition and the effect of ground rotation,and the method of solving this dynamic model is given. According Newmark's formulation of rotation ,the rotational component is obtained by vising the horizontal component. This dynamic model and the common multi-point model's time history anlysis are studied with examples by making infinite element MATLABprogram, and the result of two model is compared and analysised.Then the reaction of arch bridge on following bridge component, horizontal bridge component and rotational component earthquake excitation is studied by example, and the result is anglicized and compared get a conclusion and give some advice.The seismic response behavior of the long-span CFST arch bridge is systematically stydied.and the effect of traveling seismic wave is studied due to long span. The conclusion and suggestion, is obtained by analysis and comparison of examples under the condition whether consider the effect of traveling seismic wave.