지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 국제구조공학회 Structural Engineering and Mechanics, An Int'l Journal Structural Engineering and Mechanics, An Int'l Journal Vol.80 No.4
- 발행연도
- 2021.11
- 수록면
- 377 - 390 (14page)
이용수
초록· 키워드
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A slender steel pedestrian bridge suffers from excessive vibration under walking-induced excitations, which include vertical and lateral dynamic loads. Meanwhile, a slender footbridge may also be sensitive to the wind excitation. Excessive vibration will not only cause a serviceability problem, but also even a safety problem. Tuned mass dampers (TMDs) have been applied in slender steel bridges widely for vibration control. However, a passive TMD is sensitive to the frequency deviation.
Though a semi-active TMD (STMD) can improve the control effect of a passive TMD to a great degree, there is no STMD and related research that can simultaneously control vertical and lateral walking and wind-induced vibrations of pedestrian bridges. To fill this blank, in this paper, a two-dimensional air spring based STMD (TDAS-STMD) is proposed. The TDAS-STMD is connected to the bridge through two vertical air springs and two lateral air springs, and the stiffness of each air spring can be retuned through adjusting its air pressure by an air pump. At the same time, the damping of TDAS-STMD can be adjusted in real time through changing the air gap between the conductor plate and permanent magnets by a step putter. The mechanical detail of TDAS-STMD and the combined variable stiffness and damping control algorithm are introduced firstly. Then, a simply supported steel footbridge which is sensitive to both vertical and lateral walking and wind-induced excitations is proposed as a case study. In the numerical simulation, the bridge is simplified as a Euler-Bernoulli beam with a constant section. A group of two optimized passive TMDs which implemented in vertical and lateral directions respectively are presented for comparison. Single pedestrian walking-induced vertical and lateral vibration, wind-induced lateral vibration, and a low-density random crowd-induced vertical and lateral vibration coupled with the wind-induced lateral vibration are both considered in the case study. Numerical results indicate that the TDAS-STMD can control vertical and lateral vibrations of the beam effectively and always has the best performance.
목차
등록된 정보가 없습니다.
참고문헌 (54)
참고문헌 신청
Bhattacharyya, S. / 2017 / Nonlinear modeling and validation of air spring effects in a sealed tuned liquid column damper for structural control / J. Sound Vib 410:269~286
Liang Cao / 2020 / A simplified method for determining the acceleration amplitudes of long-span floor system under walking/running loads / Structural Engineering and Mechanics, An Int＇l Journal 75(3):377~387
Liang Cao / 2019 / Numerical study on the walking load based on inverted-pendulum model / Structural Engineering and Mechanics, An Int＇l Journal 71(3):245~255
Caprani, C. C. / 2012 / Enhancement factors for the vertical response of footbridges subjected to stochastic crowd loading / Comput. Struct 102-103:87~96
Casado, C. M. / 2013 / Implementation of passive and active vibration control on an in-service footbridge / Struct. Contr. Health Monit 20(1):70~87
Liang Cao / 2020 / A simplified method for determining the acceleration amplitudes of long-span floor system under walking/running loads / Structural Engineering and Mechanics, An Int＇l Journal 75(3):377~387
Liang Cao / 2019 / Numerical study on the walking load based on inverted-pendulum model / Structural Engineering and Mechanics, An Int＇l Journal 71(3):245~255
Caprani, C. C. / 2012 / Enhancement factors for the vertical response of footbridges subjected to stochastic crowd loading / Comput. Struct 102-103:87~96
Casado, C. M. / 2013 / Implementation of passive and active vibration control on an in-service footbridge / Struct. Contr. Health Monit 20(1):70~87
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