地震输入方向及液化扩展场地的夹角对曲线桥抗震的影响
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北京建筑大学

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U442.55

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国家自然科学基金资助项目(52078023);北京市基金-市教委科技计划重点项目(23JH0014)


Effects of seismic input direction and liquefaction expansion site direction on the seismic performance of curved bridges
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Beijing University of Civil Engineering and Architecture

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    摘要:

    地震土壤液化会产生土体失稳滑移等现象,对桥梁造成不可逆转的严重破坏。而曲线桥由于其复杂的受力状态,在液化侧向扩展场地中的地震响应更是需要关注的重点。本文选取三条典型的远场地震波,从12个具有代表性的方向输入至一座四跨连续曲线桥,且使场地最大倾斜角度与地震输入角度相同,得到该曲线桥在液化扩展场地下的地震响应规律并进行对比分析。结果表明:①按照从0°~180°逐渐变化输入地震动时,曲线桥梁桩顶弯矩逐渐减小,且边墩桩顶弯矩大于次中墩、中墩桩顶弯矩。从180°~360°逐渐变化输入地震波时,桩顶弯矩逐渐增大,且中墩、次中墩桩顶弯矩大于边墩桩顶弯矩;②随着地震输入角度的变化,墩底最大弯矩在中墩与次中墩之间交替变化,其中次中墩出现弯矩最大的次数要明显多于中墩。③墩梁相对位移随着地震动输入角度呈现先增大后减小的周期性变化趋势。因此,建议实际工程中应当判断桥梁工程所处位置可能遭受的地震动类型,根据地震动类型实施对应的抗液化措施。

    Abstract:

    Seismic soil liquefaction can lead to soil instability and slip, resulting in irreversible and severe damage to bridges. The seismic response of curved bridges in liquefied lateral extension sites is a major concern due to the complex stress state. In this study, three representative far-field seismic waves are selected and applied to a four-span continuous curved bridge from 12 different directions. The maximum tilt angle of the site is set to be the same as the seismic input angle in order to investigate the seismic response behavior of the curved bridge in the liquefaction expansion site and conduct a comparative analysis. The results reveal the following findings: ①As the far site seismic input gradually changes from 0°to 180°, the pile top bending moment of the curved bridge decreases gradually, with the side piers experiencing larger bending moments compared to the secondary center piers and the center piers. When the seismic input wave changes gradually from 180°to 360°, the pile top bending moment gradually increases, with the middle pier and the second pier experiencing higher bending moments than the side piers.②The maximum bending moment at the bottom of the pier alternates between the middle pier and the second pier as the seismic input angle changes, with the second pier experiencing a significantly higher number of occurrences of the largest bending moment compared to the middle pier.③The relative displacement between the pier and beam and the ground shaking input angle exhibits a cyclic trend of initially increasing and then decreasing. Therefore, it is recommended that the location of a bridge project susceptible to ground vibration should be determined based on the type of ground vibration, and corresponding anti-liquefaction measures should be implemented accordingly.

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焦驰宇. 地震输入方向及液化扩展场地的夹角对曲线桥抗震的影响[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-03-18
  • 最后修改日期:2024-04-24
  • 录用日期:2024-04-25
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