Numerical Method for Earthquake-Induced Pounding between Girder and Shear Key-Ⅱ: Verification

摘要

In bridges, seismic pounding may result in considerable damage during severe ground motions, such as localized girder damage, damage to shear key and abutments, and even contribute to the collapse of bridge spans. A numerical method had been developed. The paper mainly verified the numerical method through the comparison the numerical results and the experimental results. Two testessteel-steel pounding and concrete-concrete poundingare employed. The influence of the time step length on the numerical results is studied. From the parameter analysis, we find that time step length has much influence on impact force calulation and little influence on the displacement and velocity calculation and the time step At = 0.0002s can meet the computing needs in these cases, but the value is not fixed. The time step length may be difTerent when the parameters of impact bodies cbange. The time step length can be determined by comparing. In this paper, the overall prediction of the relative impact velocities is consistent with the experimental data. It shows that the numerical method is accurate and can be used in the engineering applications. In addition, it is noted that pounding may lead to considerable change of the structural response during the earthquake. So we should pay much attention to the influence of earthquake-induced pounding on the bridge seismic response.