Study on vertical vibration control of long-span steel footbridge with tuned mass dampers under pedestrian excitation

2019 ◽  
Vol 154 ◽  
pp. 84-98 ◽  
Author(s):  
Dayang Wang ◽  
Chengqing Wu ◽  
Yongshan Zhang ◽  
Shangwei Li
Keyword(s):  
Vibration Control ◽  
Vertical Vibration ◽  
Tuned Mass Dampers ◽  
Long Span ◽  
Pedestrian Excitation

scholarly journals Human-Induced Vibration Control with TMDs for Guangzhou Asian Games Comprehensive Museum

2019 ◽  
Vol 24 (4) ◽  
pp. 736-743
Author(s):  
Xue-jun Yin ◽  
Zhao-dong Xu ◽  
Yang Yang ◽  
Yong Luo ◽  
Jian-li Wang
Keyword(s):  
Vibration Control ◽  
Natural Frequency ◽  
Field Tests ◽  
Steel Structure ◽  
Vertical Vibration ◽  
Human Walking ◽  
Main Body ◽  
Tuned Mass Dampers ◽  
Research Results ◽  
Cantilever Length

Guangzhou Asian Games Comprehensive Museum is one of the permanent buildings for the 2010 Guangzhou Asian Games, whose bowl-shaped main body is a steel structure with the largest cantilever length of more than 30 meters. The structure has a low natural frequency, so it tends to be excited by people synchronizing walking with amplification of resonance, which will affect the serviceability. A large amount of analysis and field-tests are performed for this historical museum with tuned mass dampers (TMDs) being used to reduce human walking induced vibration. The results showed that TMDs can control the structure vertical vibration effectively, with the efficiency of over 50%. The research results have obvious significance for similar projects.

Vibration Control Analysis of High-Rise Cantilevered Floors under Pedestrian Walking Loads

2011 ◽  
Vol 94-96 ◽  
pp. 1110-1114
Author(s):  
Man Yi Qi ◽  
Zhi Qiang Zhang ◽  
Fei Ma ◽  
Ai Qun Li
Keyword(s):  
Dynamic Response ◽  
Vibration Control ◽  
Dynamic Characteristics ◽  
Human Activities ◽  
Vertical Vibration ◽  
Control Analysis ◽  
Tuned Mass Dampers ◽  
Human Comfort ◽  
High Rise ◽  
Normal Human

Aimed at the human comfort problem with cantilevered floors arising from normal human activities, the Tuned Mass Dampers are used to control the vibration of the steel cantilevered floors which span 16.3m. Based on studies on the dynamic characteristics of the overall structure, with the position of TMDs optimized and the parameters set reasonably, the vertical vibration response of the cantilevered floors under different cases of pedestrian walking loads is calculated. The results show that the TMD system can effectively reduce the dynamic response of the cantilevered floors, in order to meet the requirements of human comfort.

Study on human-induced vibration of a cable-stayed bridge without backstays located in abrupt valley

2021 ◽  
pp. 136943322110203
Author(s):  
Yanru Wu ◽  
Junxin Li ◽  
Qing Sun
Keyword(s):  
Empirical Formula ◽  
Dynamic Instability ◽  
Vertical Vibration ◽  
Comfort Level ◽  
Tuned Mass Dampers ◽  
Dynamic Simulations ◽  
Maximum Acceleration ◽  
Cable Stayed Bridge ◽  
Crowd Density ◽  
Lateral Modes

This research aims to assess the pedestrian comfort and to control human-induced vibration of an arch tower cable-stayed bridge without backstays located in canyon. Dynamic simulations of human-induced vibration were carried out with a mode-by-mode approach, and the results indicated that a total of seven lateral and vertical modes of the bridge may suffer from excessive vibrations at the design crowd density. Based on the periodic walking force, the structure response under pedestrian loads was evaluated performing dynamic analyses with two Finite Element models of the footbridge. A single tuned mass damper (STMD) control system was developed for control of human-induced vibration, which consisted of four tuned mass dampers mounted on the mid-span of bridge to enhance damping ratios of lively modes. The results indicate that the maximum acceleration for the first-order lateral and second-order vertical vibration at the design crowd density exceed the associated threshold values referring to the comfort level 1 (CL1) Criteria. The critical pedestrian number of lateral dynamic instability estimated by the Dallard’s empirical formula is much smaller than the dynamic design pedestrian number; and the Dallard’s empirical formula is applicable to estimate the critical pedestrian number of lateral dynamic instability for this bridge by comparing with Pedroe Inês footbridge. The damping ratios for both the vertical and lateral modes increase appreciably after installing the tuned mass dampers and no evidence of large-amplitude vibrations has been observed, leading to the realization of satisfactory comfort levels, which can provide reference for vibration reduction design of this kind of bridge.

Exploration of the Nonlinear Effect of Pendulum Tuned Mass Dampers on Vibration Control

2021 ◽  
Vol 147 (8) ◽  
pp. 04021047
Author(s):  
Kai Xu ◽  
Xugang Hua ◽  
Walter Lacarbonara ◽  
Zhiwen Huang ◽  
Zhengqing Chen
Keyword(s):  
Vibration Control ◽  
Nonlinear Effect ◽  
Tuned Mass Dampers

scholarly journals Robust Optimum Design of Multiple Tuned Mass Dampers for Vibration Control in Buildings Subjected to Seismic Excitation

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Luciara Silva Vellar ◽  
Sergio Pastor Ontiveros-Pérez ◽  
Letícia Fleck Fadel Miguel ◽  
Leandro Fleck Fadel Miguel
Keyword(s):  
Vibration Control ◽  
Structural Parameters ◽  
Simultaneous Optimization ◽  
Tuned Mass Dampers ◽  
Structural Dynamic ◽  
Energy Devices ◽  
Promising Tool ◽  
Optimization Methodology ◽  
Robust Optimum Design ◽  
Multiple Tuned Mass Dampers

Passive energy devices are well known due to their performance for vibration control in buildings subjected to dynamic excitations. Tuned mass damper (TMD) is one of the oldest passive devices, and it has been very much used for vibration control in buildings around the world. However, the best parameters in terms of stiffness and damping and the best position of the TMD to be installed in the structure are an area that has been studied in recent years, seeking optimal designs of such device for attenuation of structural dynamic response. Thus, in this work, a new methodology for simultaneous optimization of parameters and positions of multiple tuned mass dampers (MTMDs) in buildings subjected to earthquakes is proposed. It is important to highlight that the proposed optimization methodology considers uncertainties present in the structural parameters, in the dynamic load, and also in the MTMD design with the aim of obtaining a robust design; that is, a MTMD design that is not sensitive to the variations of the parameters involved in the dynamic behavior of the structure. For illustration purposes, the proposed methodology is applied in a 10-story building, confirming its effectiveness. Thus, it is believed that the proposed methodology can be used as a promising tool for MTMD design.

scholarly journals Serviceability Assessment Method of Stay Cables with Vibration Control Using First-Passage Probability

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Seunghoo Jeong ◽  
Young-Joo Lee ◽  
Sung-Han Sim
Keyword(s):  
Vibration Control ◽  
Control Method ◽  
Principal Component ◽  
Assessment Method ◽  
Stay Cable ◽  
First Passage ◽  
Long Span Bridges ◽  
Long Span ◽  
Stay Cables ◽  
Cable Stayed Bridges

As the construction of long-span bridges such as cable-stayed bridges increases worldwide, maintaining bridge serviceability and operability has become an important issue in civil engineering. The stay cable is a principal component of cable-stayed bridges and is generally lightly damped and intrinsically vulnerable to vibration. Excessive vibrations in stay cables can potentially cause long-term fatigue accumulation and serviceability issues. Previous studies have mainly focused on the mitigation of cable vibration within an acceptable operational level, while little attention has been paid to the quantitative assessment of serviceability enhancement provided by vibration control. This study accordingly proposed and evaluated a serviceability assessment method for stay cables equipped with vibration control. Cable serviceability failure was defined according to the range of acceptable cable responses provided in most bridge design codes. The cable serviceability failure probability was then determined by means of the first-passage problem using VanMarcke’s approximation. The proposed approach effectively allows the probability of serviceability failure to be calculated depending on the properties of any installed vibration control method. To demonstrate the proposed method, the stay cables of the Second Jindo Bridge in South Korea were evaluated and the analysis results accurately reflected cable behavior during a known wind event and show that the appropriate selection of vibration control method and properties can effectively reduce the probability of serviceability failure.

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