Long-Span Pedestrian Bridges in the USA - A Futuristic Approach

This paper presents a quantitative and qualitative description of global research in the field “electronic journals”. The study is based on global publications data (1747 publications) on the subject sourced from SCOPUS database covering the period 1990-2017. The study analyzes the data on a series of measures, like average annual growth, citations per paper, international collaborative papers, relative citation index, and activity index. Global research in the subject registered 18.46% growth, research impact of 5.28 citations per paper, and contributed barely 26 highly cited papers within a long span of 28 years. The USA has emerged as the world leader in electronic journals research accounting for 45.28% global publications share, followed by U.K. (12.18%), India (5.49%), etc. Top 20 organizations and authors in the subject contributed 16.58% and 11.15% global publications share respectively and 37.72% and 43.92% global citations share respectively during the period.

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Vibration Reduction Using Tuned Mass Dampers in Composite Steel Box Girder Footbridge with Self-Anchored Suspension

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455421501108 ◽

2021 ◽

pp. 2150110

Author(s):

Pengzhen Lu ◽

Yutao Zhou ◽

Ying Wu ◽

Dengguo Li ◽

Chenhao Zhou

Keyword(s):

Global Analysis ◽

Vibration Reduction ◽

Mode Shapes ◽

Box Girder ◽

Dynamic Design ◽

Long Span ◽

Steel Box Girder ◽

Pedestrian Bridges ◽

Wide Range ◽

Composite Steel

Owing to the increasing span of pedestrian bridges and the use of new lightweight and high-strength materials, the natural frequency of pedestrian bridges has been reduced significantly. A pedestrian bridge experiences a wide range of vibrations while being walked on by large crowds. This type of vibration affects the comfort of people walking on the footbridge and also the safety of the footbridge. This paper proposes a dynamic design method that is suitable for long-span composite footbridges. The footbridge considered in this study comprises a composite steel box girder with self-anchored suspensions and has a main span of 70.5[Formula: see text]m. The dynamic characteristics of the long-span footbridge were analyzed using the finite element model, and the first 10 frequencies and mode shapes were obtained. Based on the global analysis of comfort standards, the comfort index for a practical evaluation was proposed, along with the walking excitation load. Meanwhile, a tuned mass damper (TMD) was adopted for the vibration reduction of the long-span footbridge constructed using a composite box girder with self-anchored suspensions in order to determine its applicability. Furthermore, the TMD layout was optimized using a GA. The results demonstrated that the proposed method can provide a theoretical basis and reference for the dynamic design of long-span composite pedestrian bridges.

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Dynamic Performance Characteristics of Pre-Stressed Cable RC Truss Floor System under Human-Induced Loads

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455417500493 ◽

2017 ◽

Vol 17 (04) ◽

pp. 1750049 ◽

Cited By ~ 13

Author(s):

Xuhong Zhou ◽

Jiang Li ◽

Jiepeng Liu ◽

Y. Frank Chen

Keyword(s):

Plate Theory ◽

Dynamic Performance ◽

Dynamic Responses ◽

Classical Plate Theory ◽

Design Guideline ◽

Long Span ◽

Magnification Factors ◽

Floor Vibrations ◽

The Usa ◽

Floor System

Excessive floor vibrations in slender structural systems due to human activity are becoming more prevalent. This may result in serviceability problems such as discomfort to occupants and even subsequent public panic. This paper describes the experimental and analytical studies on the vibration performance of a long-span pre-stressed cable RC truss (PCT) floor system, along with an extensive comparison between the present results and the current vibration design criteria used in the USA and China. The dynamic responses of this floor system under heel-drop, falling-into-seats, and jumping loads were obtained through on-site tests. The test results show good agreement in natural frequencies of the PCT floor system with others, but there are obvious differences in peak accelerations and damping ratios. A method based on the classical plate theory was adopted to determine the fundamental frequency of the system. Dynamic magnification factors (DMFs) under different loads were calculated using the inversion technique and then compared with the results available from others. Some of the conclusions achieved may be incorporated into the structural design of the system of concern to improve safety and serviceability. They can also serve as the basis for developing the relevant design guideline.

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Study on Dynamic Test of a Large Span Steel Truss Pedestrian Bridge

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.255-260.769 ◽

2011 ◽

Vol 255-260 ◽

pp. 769-775

Author(s):

Mao Qi Li

Keyword(s):

Dynamic Performance ◽

Dynamic Test ◽

Element Model ◽

Vertical Vibration ◽

Response Analysis ◽

Pedestrian Bridge ◽

Long Span ◽

Pedestrian Bridges ◽

Steel Truss ◽

Recorded Data

To prevent a long-span steel truss pedestrian bridge vibration problem, finite element model was established by analysis software ANSYS, studies on this pedestrian bridge’s vibration question were carried on by frequent spectrum analysis based on recorded data and modal analysis. It has determined the vibrating level. In addition, the reason for this pedestrian bridge’s vibration has been thoroughly analyzed from the pedestrian and traffic, and had dynamic response analysis of pedestrian bridges under the crowd of pedestrians walking load. Then the main reason which causes the actual vibration characteristic has been found. Thus these both gave the reasonable explanation to the vertical vibration and provided the reference for the similar structure’s dynamic performance research.

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