Seismic Response Analysis Of Heping Road Bridge Spaning Railway Station In Xuzhou City

With the span of cable-stayed bridge increasing, more and more attention is paid for the aseismatic capability of cable-stayed bridge. The seismic analysis for long-span cable-stayed bridges has two aims: the first is to ensure an enough safety margin against basal earthquake intensity; the second is to provide scientific bases and effective ways for seism-resistant design of bridge.Heping Road Bridge spaning railway station in Xuzhou City is a concrete cable-stayed bridge with single tower and double spans,the total longth is 176+192 meter. The earthquake intensity of the situation of this bridge is VII, so the earthquake response analysis of this bridge is significant. The dynamic behavior and seismic response of the bridge are investigated in this thesis. The main research work covers the following aspects:(1)3-D finite element model of the bridge is established with software ANSYS.Its inherent vibration is analyzed by use of Lanczos method.(2) The seismic response spectrum is used to analyze the seismic response of the Xuzhou Bridge.The seismic response spectrum theory introduces the conception of seismic load in essence,the maximal seismic response of the structure is calculated and takes into account ground movement and dynamical property of structure,The standard seismic response spectrum is inputted from longitudinal, transverse and vertical direction respectively.Two kinds of seismic combinational modes, which are longitudinal vibration plus vertical vibration and transverse plus vertical vibration are considered. The SRSS approach is applied in numerical calculation.(3) Dynamic time-history analysis method is used to analyze the seismic response of the bridge under the coincident earthquake excitation. The temporal-displacement and the temporal-inner force acting on seismic load is analyzed by use of EI-Centro.