Large-span Concrete Arch Bridge Seismic Response Analysis

As a huge earthquake and devastating natural disasters are difficult to predict, in recent years, earthquake activity in an active phase, the global occurrence of a number of earthquakes, caused tremendous damage to seriously endanger people's lives and property. Bridge as a hub for road transport and throat, but also the lifeline of the road works project in one of the damage caused by the earthquake, in terms of quantity, or extent, are much higher than other natural disasters. Serious disaster not only a direct impact on the bridge traffic, and often lead to secondary disasters, thus exacerbating the severity of the earthquake disaster. Therefore, the study of the seismic response of bridge hands, so as to scientific and rational system for the establishment of earthquake provides a theoretical basis.In this paper, the results of the study at home and abroad, and related theory, based on the rock bridge to hang well for the engineering background of large-span concrete arch bridge of the earthquake response of the study the following aspects:1,analysis of large-span reinforced concrete arch bridge vibration characteristics and its influencing factors.2,the use of finite element analysis software ANSYS, through appropriate to simplify the establishment of the structure of reinforced concrete arch bridge model, dynamic analysis as the basis for the calculation of reinforced concrete arch bridge vibration characteristics and analysis of its influencing factors.3,using the standard response spectrum as input the spectral curve, respectively, to consider three orthogonal input to the seismic response of bridge structures, select a different type of spectrum space curves do spectrum analysis and the results of the key sections in the arch of the internal forces and Comparison of displacement response and analysis.4,analysis of large-span reinforced concrete arch bridge in the same seismic response under the incentive to explore the coupling of vertical and vertical excitation on seismic response of structures, and a variety of input ground motion, the key section of the bridge structure of the internal force and displacement response comparison and analysis, response spectrum results with the corresponding time-history analysis results were analyzed.5,consider traveling-wave effects on large-span reinforced concrete arch bridge in response to the impact of the earthquake, and the different velocity-depth study of large-span reinforced concrete arch bridge in response to the impact of the earthquake, have a negative impact on the whole, and therefore long-span reinforced concrete arch bridge seismic in response to the analysis of traveling-wave effect is considered necessary.