Anti-seismic Analysis And Construction Monitoring Of The Tongnan Bridge

TongNan Bridge locates in the downtown of Tianjin, which spans the Haihe River, and it connects Tongnan Road of Nankai district to Jinbu Road of Hebei district. The whole bridge is 180m long and 35m wide. The area of the bridge is 4985.2 m2, it will improve the traffic condition greatly and play a very important part in the economic development in this area.This paper carries out a seismic analysis on Tongnan bridge and supervise the construction process. The seismic analysis is performed by using software ANSYS. The content is mainly divided in five facets, as follow:(1) The establishment can reflect the actual project characteristic three dimensional finite element model, and carries on the optimization to the model, reduces the nonessential huge computation(2) Carrying on the modal analysis on the finite element model .Extracting the first 10 step frequency value of this bridge, and extracts the chart which corresponds, then analysising on them to get the conclusion which can be helpful to the engineering design.(3) The seismic response is calculated by seismic response spectrum method and input the acceleration time history of Tianjin wave, El-Centro wave, Taft wave and man made wave to calculate the seismic response.(4) The analysis of the bridge structural response under the pedestrian excitation. The frequency of pedestrian excitation is from 1.6Hz to 2.4Hz. We find the triaxial FEM calculation model, calculate the frequency of the platform bridge, and then acquire the structural stress and displacement.(5) Carrying on the monitoring to the construction process, and analysis the observation data to get the result which can be useful to the construction.