曲线梁桥近断层地震响应分析
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TU997; U441+.3

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(国家自然科学基金资助项目(51308293);江苏省自然科学基金资助项目(BK20130937)


Analysis of Seismic Response of Curved Bridge Subjected to Near-Fault Ground Motion
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    摘要:

    由于近断层地震动的脉冲特性,结构在近断层地震下的动力响应与远场地震动下的情况存在较大不同。首先,选取了近断层脉冲地震动、近断层非脉冲地震动及远场地震动3类地震动记录,采用方差分析方法研究了3类地震动特征参数的差异;其次,以一典型的两跨曲线梁桥为工程案例,建立了多尺度有限元模型,对桥梁在3类不同地震动下的非线性时程响应分析进行了数值模拟,从主梁响应、桥墩响应和支座响应等方面进行分析比较;最后,研究了近断层地震动对于曲线梁桥地震响应的影响以及地震动强度指标与曲线梁桥最大响应的相关性。研究结果表明:3类地震动的峰值地面位移和峰值速度与峰值加速度的比值具有明显的差异;曲线梁桥在具有速度脉冲特性的近断层地震动作用下地震响应剧烈,易引起主梁落梁、墩柱及支座破坏;地震动强度指标峰值地面速度(peak ground velocity, 简称PGV)/峰值地面位移(peak ground displacement, 简称PGD)与位移最大响应的相关性最好,位移型地震动强度指标PGD和均方根位移drms与弯矩最大响应的相关性最好。

    Abstract:

    Due to pulse characteristics of near-fault ground motion, structural seismic response subjected to near-fault ground motion is different from far-field ground motion. Firstly, three types of ground motions including near-fault pulse, near-fault non-pulse and far-field ground motions are selected, andthe difference of characteristic parameter is analyzed by variance analysis method. Secondly, using a typical two-span curved bridge as an engineering example, the multi-scale finite element model is established to simulate the nonlinear history time responses subjected to three different types of ground motions respectively, and the responses of girder, pier and bearing of bridge are compared. Finally, the influence of near-fault ground motion on seismic response of curved bridge is analyzed, and the correlations between ground motion intensity indices and maximum responses of curved bridges are studied. The results show that the peak ground displacement(PGD), the ratio of peak velocity, and the peak acceleration of three types of ground motions are obviously different. The seismic response of curved bridge is quite strong under the action of near-fault ground motion with velocity pulse characteristic, easily leading to unseating,pier and bearing damage of bridge. The correlation among peak ground acceleration (PGA), peak ground velocity (PGV) and the maximum displacement response is best,whereas the correlations of displacement-related intensity indices such as PGD and the root-mean-square displacement (drms) are highly linear with the maximum bending moment response.

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  • 在线发布日期: 2018-09-04
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