Seismic Resistance Research Of The Arch Aqueduct Structure

Aqueduct is one of the most widely used cross buildings in hydraulic structure. As Chinais located in an earthquake-prone area, seismic design of the aqueduct has a very importantinfluence on safety and economical operation of water supply engineering. Arch Aqueductsare widely distributed in earthquake areas because of advantage about beautiful bodily form,better bearing performance and economy structure. What we should carefully considered indesign, scientific research and construction is the safety of the aqueduct under the action ofearthquake.At present domestic scholars has done less research on supporting system of archaqueduct. However the supporting system is very important for structure stability, thefoundation adaptability, and structure seismic stability. So the supporting system research anddesign work should be caused enough attention. At present it has a large black in the study ofdiffent rise-span ratios, wide-span ratios and arch axis forms about arch aqueduct. Thereforseismic research on arch aqueduct has a great innovation with different structure forms.On the basis of reading a mass of references of seismic design research about the archaqueduct and bridge, this thesis analyses the key factors in the seismic research of theaqueduct respectively from the structural dynamics and structure seismic response spectrumtheory, and combined with large finite element software ANSYS.(1) Combined with the main link and attention of finite element structural dynamics andvibration analysis, and with the engineering types, this thesis introduces the process of archaqueduct dynamic model, the mass elements characteristics of simulation about water bodyfunction, and the operating process of degrees of freedom coupling, and then establishes fourtypes of conditions about seismic response analysis.(2) Through structure dynamics analysis of the arch aqueduct, and combined with thestructure motion equation, mass matrix and damping matrix, we get the modal solution andmode vibration characteristics of lower basic vibration modes about the aqueduct with emptytank model and water-carriage model conditions. By changing the rise-span ratio, wide-spanratio and arch axis form of the aqueduct bearing structure, we analyze self-resonant frequencyand vibration model features of different structure forms, and get the rule of structure stiffness effected by the change of structure form.(3) Combined with seismic response theory of the aqueduct structures, the applicablescope of the static method, method of vibration response spectrum, and method of plasticanalysis in time, we emphasize the numerical simulation analysis for seismic response of thearch aqueduct through model vibration response spectrum method. We respectivelyconsidered the influence rule of structural internal force under the earthquake motivationalong the transverse directions and the longitudinal directions. We get some research ondistributing characteristies for axial force, shear force, in-plane bending moment andout-plane bending moment of typical sections on main arch ring of the arch aqueduct. We alsodo some checking for the strength of cross sections of main arch ring, then we get the mostsuitable rise-span ratio, wide-span ratio and the arch axis form meeting seismic requirements.All these researches could provide some certain reference for the structure seismic designstudy of arch aqueduct.