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高墩大跨桥梁多自由度拟动力试验设计分析及试验验证 被引量:5

Analysis and Test Verification of MDOF Pseudo-Dynamic Test Design of Long Span Bridge with High-Rise Piers
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摘要 为改善高墩等质量连续分布体系单自由度拟动力试验的精度,以牛栏江大桥为例对该类结构的多自由度拟动力试验进行研究,并对加载模型进行合理减化。通过多自由度结构动力反应分析理论、高柔结构地震反应数值计算及桥梁简化模型的振动台试验,分析高阶振型对高墩大跨桥梁地震反应的影响。结果表明:对于高柔结构,采用等效单自由度体系的拟动力试验的位移结果是准确的;高阶振型对高墩大跨桥梁等高柔结构地震反应的基底剪力和基底弯矩影响较大,影响程度与地震波的频谱特性有关;在特定地震动作用下,2阶振型会对高柔结构的基底弯矩和基底剪力起主要贡献,故百米级高墩的拟动力试验等效为2自由度体系进行加载是合适的,若采用等效单自由度体系进行试验,应变及试验现象可能与实际不符。 To improve the accuracy of the single-degree-of-freedom pseudo-dynamic test for the continuous distribution system with high-rise piers and equivalent mass,the Niulan River Bridge,a long span bridge with high-rise piers,was taken as an example,the multi-degree-of-freedom (MDOF) pseudo-dynamic test for the bridge of the same kind was studied and the test loading model was rationally simplified.The influences of the high-order vibration modes on the seismic responses of the example bridge were analyzed,using the dynamic response analysis theory for the MDOF structure,the seismic response numerical calculation for the high-rise and flexible structure and the shaking table test for the bridge simplified loading model.The results of the analysis demonstrate that for the high-rise and flexible structure,the structural displacement results obtained from the pseudo-dynamic test of the equivalent single-degree-of-freedom system are correct.In the seismic responses of the high-rise and flexible structure like the long span bridge with high rise piers,the influences of the high-order vibration modes on the base shear forces and base moment of the structure are great and the degrees of the influences are associated with the characteristics of the seismic wave frequency spectra.Under the action of the given ground motion,the second-order vibration mode will make a major contribution to the base shear forces and base moment and in such case,it will be proper that the load should be applied to the bridge with piers higher than hundred meters by equalizing the pseudo-dynamic test for the bridge as the two-degree-of-freedom system and if the test is made by equalizing the test as the single-degree-of-freedom system,the strain and test phenomena may not be agreeable with the actual situations.
出处 《桥梁建设》 EI CSCD 北大核心 2014年第4期68-74,共7页 Bridge Construction
基金 交通运输部天津水运工程科学研究所基本科研业务费项目(TKS140101)~~
关键词 高墩大跨桥梁 高柔结构 多自由度 拟动力试验 振动台试验 高阶振型 地震反应 long span bridge with high-rise piers high-rise and flexible structure multi-degree-of-freedom pseudo-dynamic test shaking table test high-order vibration mode seismic response
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