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首页> 外文学位 >Lateral and torsional vibration control of long span bridge deck using novel tuned liquid column dampers.
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Lateral and torsional vibration control of long span bridge deck using novel tuned liquid column dampers.

机译：使用新型调谐液柱阻尼器控制大跨度桥面的横向和扭转振动。

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摘要

Long span cable-supported bridges are rapidly increasing nowadays not only in number but also in the length of central-span because of their inherent economical and technical advantages. However, these long span bridges are very flexible and lightly damped and vulnerable to wind-induced vibration. In particular, during the erection, long span bridge deck lacks continuity from pylon to pylon and its rigidity is much lower than that of a completed bridge. Serious buffeting vibration has been observed from a few long span cable-supported bridges during construction. Reviews of the existing literature, however, show that few studies have examined the suppression of lateral and torsional vibration of long span bridges. This thesis thus focuses on the development and application of novel tuned liquid column dampers for suppressing lateral and torsional vibration of long span cable-supported bridges during construction and at completion stage.; The frequency of STLCD or MTLCD depends solely on the length of liquid column, which imposes certain restrictions on its application to long span bridges. Multiple pressurized tuned liquid column dampers (MPTLCD) are thus studied to facilitate lateral and torsional vibration reduction of bridges and to improve the sensitivity under mistuning. The MPTLCD container is sealed with an air chamber at its two ends. The frequency tuning can be adjusted by manipulating static pressure inside the air chamber while the length of liquid column is fixed. To control vibration of bridges with high natural frequency, the MPTLCD with a longer liquid column length can be used to replace the STLCD or MTLCD with a shorter liquid column length. However, for a long span cable-supported bridge during construction, its very low natural frequency may require a STLCD or a MTLCD with very long liquid column length, which may not be possible in practice. Moreover, natural frequencies of a long span bridge vary during its construction stage. Hence, tuned liquid column dampers with adaptive frequency tuning capacity are developed for suppressing lateral and torsional vibration of bridges using a semi-active control technology. The natural frequency of the semiactive tuned liquid column dampers (SATLCD) studied herein can be adjusted by active control of air pressures at the two chambers of a PTLCD.
机译：如今，大跨度斜拉桥由于其固有的经济和技术优势，不仅在数量上而且在中跨长度上都在迅速增长。但是，这些大跨度的桥梁非常灵活，阻尼小并且容易受到风振的影响。特别是在安装过程中，大跨度桥面从塔架到塔架的连续性不足，其刚度远低于完整桥的刚度。在施工过程中，从几个大跨度的索桥上观察到严重的抖振。然而，对现有文献的回顾表明，很少有研究检查对大跨度桥梁横向振动和扭转振动的抑制作用。因此，本论文着眼于新型调谐液柱阻尼器的开发和应用，以抑制大跨度斜拉桥在施工期间和竣工阶段的横向和扭转振动。 STLCD或MTLCD的频率仅取决于液柱的长度，这对其在大跨度桥梁上的应用施加了一定的限制。因此，研究了多重加压调谐液柱阻尼器（MPTLCD），以帮助减少桥梁的横向和扭转振动，并提高雾化条件下的灵敏度。 MPTLCD容器的两端用气室密封。在液柱长度固定的情况下，可以通过控制气室内的静压力来调节频率调谐。为了控制高固有频率的电桥振动，可以使用液柱长度较长的MPTLCD来代替液柱长度较短的STLCD或MTLCD。但是，对于在施工期间使用大跨度电缆支撑的桥，其极低的固有频率可能需要STLCD或MTLCD的液柱长度很长，这在实践中是不可能的。此外，大跨度桥梁的固有频率在其建造阶段会有所不同。因此，开发了具有自适应频率调谐能力的调谐液柱阻尼器，以使用半主动控制技术抑制桥梁的横向和扭转振动。本文研究的半主动调谐液柱阻尼器（SATLCD）的固有频率可以通过主动控制PTLCD的两个腔室中的气压来调节。

著录项

  • 作者

    Shum, Kei Man.;

  • 作者单位

    Hong Kong Polytechnic University (People's Republic of China).;

  • 授予单位 Hong Kong Polytechnic University (People's Republic of China).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 341 p.
  • 总页数 341
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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