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为研究连续梁桥结构在强震下的动力响应,设计制作了1个1∶3的两跨连续梁桥缩尺比例模型,考虑不同的支座类型,选取Landers波、Cerro Prieto波、El Centro波和Chi-Chi波等4种反映不同场地土特性的地震波,进行了不同地震动输入下缩尺模型桥的地震模拟振动台台阵试验。研究结果表明:在短周期地震动作用下,边墩加速度响应强于中墩,而在长周期地震动下中墩加速度响应大于边墩;地震波双向输入下模型桥的响应大于单向输入时的响应,应关注多向地震动作用下连续梁桥的横向地震动响应;随着输入地震动强度加大,墩柱响应变化最为显著,墩梁相对位移峰值都大于绝对位移峰值差;采用高阻尼橡胶支座隔震后边墩的减震效果较为显著,且可降低落梁的风险;研究可为强震下连续梁桥的动力反应分析提供依据,也可为同类型钢筋混凝土连续梁桥的抗震设计和抗倒塌设计提供参考。
In order to study the dynamic response of continuous girder bridge under strong earthquakes, a 1: 3 two-span continuous girder bridge scale-scale model was designed. Considering different bearing types, Landers wave, Cerro Prieto wave, El Centro Wave and Chi-Chi wave and other four kinds of seismic waves that reflect the soil characteristics of different sites were tested by using the earthquake simulation shaking table test under different ground motion inputs. The results show that under short-period ground motions, the acceleration response of side pier is stronger than that of middle pier, while the response of middle pier under long-period ground motions is larger than that of side pier. The response of model bridge under seismic bidirectional input is larger than that of one-way input Response should pay attention to the lateral ground motion response of continuous girder bridge under multi-directional ground motion. With the increase of ground motions, the response of pier column is the most significant, and the relative displacement peak value of pier girder is larger than the absolute displacement peak difference. The damping effect of the side pier after rubber bearing isolation is significant and the risk of dropping the beam can be reduced. The research can provide the basis for the dynamic response analysis of the continuous girder bridge under strong earthquake and also can be used for the seismic response of the same type of continuous girder bridge Design and anti-collapse design for reference.