Static And Dynamic Characteristics Research On Low-pylon Cable-stayed Bridge With Twin-tower Twin-cable-plane Under Different Parameters

In recent years,there has been a new bridge-type range between the continuous girder bridge and cable-stayed bridge,which we call it extradosed cable-stayed bridge.If we call the beam bridge is rigid bridge and cable-stayed bridge is flexible bridge,then extradosed cable-stayed bridge can be called rigid-flexible bridge which both has rigid and flexible characteristics.Extradosed cable-stayed bridge is characterized by low tower, firm grider and cable centralized.It is a high-order statically indeterminate structure.At the same time, the cable in extradosed cable-stayed bridge share a part of the main beam loading effect,which is regarded as an external prestressing in the structural characteristics.Therefore,extradosed cable-stayed bridge will easily be chose when designer design large and medium-span bridgesBut as a new bridge structure type,its design and computation theory is still not perfect and research is not many for this type.Therefore,do research on extradosed cable-stayed bridge about its mechanical properties,especially for extradosed cable-stayed bridge with twin-tower twin-cable-plane is necessary.Research in this paper may provide the basis and reference for design on the extradosed cable-stayed bridge,and it has important theoretical significance and value.This is why this paper written.According to present research status,taking Jiangdu Qizha bridge which is extradosed cable-stayed bridge with twin-tower twin-cable-plane across the Gaoshui River in Jiangdu City of Jiangsu Province as researching background,this paper establish ANSYS finite element models combined load test data,analysis bridge's static performance and dynamic performance under different parameters.So that it can provide the references for extradosed cable-stayed bridge design.The main research contents are as follows:1.According to the relevant norms and standards,monitor cable force during the construction phase.Develop load test program,then implement static and dynamic load tests.Finally comparing the measured data and calculated data.2.Establishing finite element modal using ANSYS,analysis of extradosed cable-stayed bridge with twin-tower twin-cable-plane under load,obtained variation of deflection, bending moment and stress.Finally,maximum deflection appear in the mid-span location.And extreme stress appears in the tower near the root and midspan.3.By changing the length of non-cable area,tower height and cable area,analysis their influence on static characteristics of extradosed cable-stayed bridge on the base of above-mentioned model and draw relevant conclusions.Compared characteristics between extradosed cable-stayed bridge and the of rigid beam bridge under the same parameters4.By changing the different parameters,analysis their influence on Dynamic Characteristics of extradosed cable-stayed bridge on the base of above-mentioned model and draw relevant conclusions.