爆破地震波作用下变截面大跨径连续梁桥的动力响应研究

在阐述爆破地震波基本理论的基础上,就爆破地震波激励下多自由度结构反应谱理论和动力响应进行了探讨;采用反应谱分析方法和SRSS振型叠加方法,对不同跨径组合的连续梁桥在抗爆地震设计反应谱下的位移响应差异进行了研究。结果表明,在合理的边中跨比取值范围内,适当减小边中跨比,可以提高连续梁桥的抗爆性能;桥梁孔数多的其抗爆安全性能优于孔数少的;固结约束设置在中跨,其动力响应峰值有所减小且分布更加均匀。

Study on the dynamical response of variable cross-section long span continuous bridge by the blasting seismic wave

This paper discussed the analysis the dynamical response of the multi-degree of freedom system under the blasting vibration by the response spectral theory based on the elementary knowledge about the blasting seismic wave.Research the differences about displacement response of different span portfolio continuous bridge under the design response spectrums of antiknock seismic by the self-oscillation characteristic analysis of continuous bridge.The results show that,in a reasonable range of side-span ratio,we can improve the antiknock performance of continuous bridge by reducing this ratio;and the antiknock performance of bridge which has more span number is better,the bridge which set the fixed constraint on middle span has less and uniform dynamic response peak.