Seismic Performance Analysis Of Continuous Rigid Frame Bridge With High-piers And Long-span

The Continuous Rigid Frame Bridge with High-Piers and Long-Span has excellent mechanical performance, adaptability, modelling beautiful styling, cross-cutting, convenient construction, cost economic and other benefits. In recent years, highway and railway construction in our country are developing gradually from the plain micro hillock area to the southwest and northwest mountain area. It is the traffic trunk line, but the earthquake damage will have a huge impact on transportation and the earthquake relief work of the whole region. The current, the bridge that seismic design requirements are beyond the scope of existing specifications, the seismic analysis method proposed design is relatively small and inadequate performance. Therefore, to carry out the bridge analysis of the seismic performance, to master its damage principle and seismic capacity problem has important practical significance, but also very necessary.This paper will summarize and comb the bridge damage, and emphatically expounds the damage mechanism of damage to Bridges. Based on the under construction project Tukan Wujiang Bridge, which is a continuous rigid frame bridge with high-piers and long-span in Wulong County, which as the research object:1.Using the finite element software ABAQUS to establish a spatial finite element model of the bridge, which real reflect the stiffness and mass distribution of the structure, the dynamic characteristics is analyzed numerically.2.By studying the variation laws of continuous rigid frame bridge subjected to the dynamic earthquake loading, the natural vibration characteristics and effective modal mass participation under the built-up bridge case is gotten, and the number of vibration modes, which is necessary to the vibration mode combination with applying the response spectrum method under the earthquake action, is concluded.3.The response of the bridge under earthquake action combining with the response spectrum and the time-history method which are deterministic methods is analyzed, and the response maximum value of structure under each probability of earthquake action respectively is gotten as well. Meantime, the results of the two methods separately are compared.4.Considering the impact of spatial variability of ground motion and change parameters on the pier higher seismic response of the bridge.Show that Under the same conditions of excitation, High pier relatively soft, and its bending moment was significantly greater than moderate-high piers; the shear forces which high pier of the bridge pier where at the end and the top significantly less than of short pier.5.Based on the principles fortification :two levels, two stages. The comprehensive seismic performance of the bridge is analyzed and evaluated. The results show that the seismic performance of the rigid frame bridge is good, has enough seismic capacity and can meet the expected design performance according to the existing standard of the bridge. Seismic design and construction for the type of bridge provides a reference, but also further analysis of the seismic performance of such bridge type, providing the cornerstone.Finally, this paper expounds the current ductility seismic design of the elevated Bridges(capable of protecting the design), and the main construction measures in the practical engineering applications.