Seismic Response Analysis Of Self-anchored Suspension Bridge Considering Traveling Wave Effect

The self-anchored suspension bridge is a special suspension bridge structure.The main cable of the bridge type is directly fixed on the stiffening beam and there is no need to set the anchor in the construction.The stiffening beam bears the horizontal axial force transmitted by the main cable,compared with the traditional suspension bridge.Due to the special force characteristics and construction sequence of the ground-anchored suspension bridge,the self-anchored suspension bridge has the advantages of adapting to special geological terrain,strong plasticity and good economics,and more applications in urban bridge construction.The catastrophic damage caused by the earthquake is undoubted.The transmission of seismic waves is random,and the traveling wave effect refers to the time when seismic waves reach each load-bearing structure.The self-anchored suspension bridge is an important urban bridge structure.Once the damage caused by the earthquake is unpredictable,in the seismic design of the self-anchored suspension bridge,the analysis considers The seismic response analysis of the wave effect is very necessary.Based on the literature review,this paper introduces the development status of modern self-anchored suspension bridges at home and abroad with the characteristics,advantages and disadvantages of self-anchored suspension bridge structures.By analyzing the structural characteristics of traditional suspension bridges,the three factors of geometrical nonlinear in self-anchored suspension bridges are obtained.The factors also explain the significance of bridge seismic response analysis and the research status of traveling wave effect.Then the finite element calculation model of the self-anchored suspension bridge with the main span of 300 m was established by using Midas/Civil.The dynamic characteristics of the bridge model were analyzed,and the first 30-order natural vibration frequency and mode shape were obtained.Finally,the time history was used.The analysis method analyzes the displacement and internal force response of the bridge under uniform excitation.On the basis of this,the traveling wave effect is realized by changing the apparent wave velocity of the seismic wave,and the displacement and internal force of the bridge under the same seismic wave and different seismic wave input modes are analyzed.response.The calculated results are compared and analyzed.The main conclusions are as follows: the self-anchored suspension bridge has the flexible characteristics of thetraditional suspension bridge and the vibration mode is dense;the traveling wave effect affects the internal force and displacement response of the self-anchored suspension bridge,and studies the structural characteristics of the bridge.The selection of seismic waves is related to factors such as input methods.