The Force And Dynamic Characteristics Study Of Antisymmetric Arch Tower Cable-stayed Bridge

With the development of transportation infrastructure,people put forward higher requirements for the bridge construction.Bridge is not only as an important engineering structure on the traffic line,but also an art structure existing in social life.Especially for the growing importance of bridge aesthetics,shaped arch development sprung up everywhere.Both the oblique boom and shaped arch composed unique shape,compared with the general static effect arch,it can have a strong momentum effects and beautiful sense of rhythm,can coordination around environment easily.Therefore,how to make the bridge structure can be both beautiful without unduly consume financial and material resources,it has become an important topic of the current bridge design.The article based on antisymmetric arch tower cable-stayed bridge,according to the mechanical characteristics of special-shaped cable-stayed bridge,used a finite element software to analysis the model.Based on the theory of finite element simulation,this paper discussed the effects of different cross-sectional and span ratio of arch tower on its mechanical behavior.When the amount of steel in certain circumstances,under the same conditions,the bridge's mechanical properties of circular cross-section of the arch is better than other types of cross-section.For research on the arch tower span ratio,it is found that the span ratio is about 0.4-0.5,overall deformation of the deck to a minimum,maximum stress and maximum deformation arch tower is also minimized.At the same time in all directions arch support force is relatively small,so we can say that this time span ratio of the arch axis is relatively better choice of span ratio.This paper also analyzed the dynamic characteristics of antisymmetric arch tower cable-stayed bridge and its response under seismic loads.The paper use Tianjin wave and time history analysis method to get the seismic response characteristics of the antisymmetric arch tower cable-stayed bridge.It said that for antisymmetric arch tower cable-stayed bridge,the transverse direction of seismic waves on the bridge is much larger than the effect of the longitudinal bridge seismic waves.Vertical Seismic waves-arch tower cable-stayed bridge on the antisymmetric displacement is relatively small,but had a great influence on the tower arch stress.