Abstract
The Chengdong Hanjiang Bridge in Ankang City is a multi-span continuous beam-arch combination system bridge of (75+2×125+160+2×125+75) m, and its site is located in the earthquake zone. Calculation model based on Midas / Civil finite element software process analysis method is applied to seismic response analysis using power. At the same time, in order to influence the travelling wave effect and the seismic isolation system on the internal force of the bridge structure, corresponding finite element models were established and calculated with time history analysis. The finite element model under non-uniform excitation uses the “Large Mass Method” (LMM) for analysis and calculation under different wave velocity multi-point excitations. The results show that after considering the traveling wave effect, the displacement and bending moment of the control section of each hole increase, and the internal force of the fixed pier increases. When the wave velocity is 600m/s, the traveling wave effect strengthens the seismic response of the structure the most. With the increase of the wave velocity, the seismic response of the structure gradually approaches the seismic response under uniform excitation. After the friction pendulum seismic isolation support is used, it is fixed. The bending moment of Pier No.32 has been reduced by 80%, the stiffness of the whole bridge is more balanced, the forces of each pier are relatively close, and the isolation effect is good.
Highlights
According to Article 5.1.3 of the Highway Bridge Seismic Design Rules (JTG/T B02-01-2008), Class A bridges should be determined in accordance with a special earthquake engineering site seismic safety evaluation .According to The Work Safety Report of Chengdong Hanjiang River Bridge in Ankang City, the site of the bridge is a Class II site, and the basic earthquake intensity is VII
A comparative analysis is performed based on the seismic response of the structure under the action of a uniformly excited earthquake to calculate the effect of the traveling wave effect on the internal force and displacement of the continuous beam-arch composite structure
As the wave velocity increases, the amplitude of its change will decrease, and the closer the seismic response of the structure is to the seismic response of the structure under uniform excitation
Summary
Ankang Chengdong Hanjiang Bridge (75 + 2 × 125 + 160 + 2 × 125 + 75m) is a seven-hole continuous beam-arch composite system bridge. A three-dimensional finite element model was established using Midas/civil finite element software. In order to consider the influence of approach bridges, a continuous beam model of adjacent approach bridges was established. The suspender of the main bridge is simulated by a truss unit, the bearing of the approach bridge is a basin bearing, and the linear connection unit is used for simulation.
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