Design and Construction of a Very Lively Bridge

Živanović, Stana; Johnson, Roger P.; Dang, Hiep Vu; Dobrić, Jelena

doi:10.1007/978-1-4614-6555-3_41

Cited by 8 publications

(8 citation statements)

References 4 publications

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“…Numerical example related to a real single-span steelconcrete composite bridge [42] is considered. The basic properties of the bridge are as follows: span length 16.2 m; total mass 13432 kg; the first two natural frequencies of the bridge 2.48 and 7.78 Hz.…”

Section: Influence Of Human Parameters: Numerical Resultsmentioning

confidence: 99%

Experimental and Numerical Investigation of the Effect of Standing People on Dynamic Properties of a Beam-Like Bridge

Xie

Liu

2017

Mathematical Problems in Engineering

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This paper studies the vertical dynamic properties of a beam-like bridge attached with standing people. A purpose-built lively bridge was constructed. Model properties of the empty structure are obtained using ambient vibration testing method. Experimental tests of the bridge attached with standing people were also conducted covering a variety of densities of occupants and different postures. The considerable number of participants and repetitions makes it possible to take into account inter-and intrasubject variability. To illustrate the variations of dynamic properties of the structure, a mathematic model of standing people-structure interaction system is developed employing the single degree-of-freedom (SDOF) human body model. It is shown that the model developed herein can effectively illustrate the experimental observations. Based on the model, the effect of damping and natural frequency of the human body on dynamic properties of the occupied structure is scrutinized. Results show that the modal properties of the human body contribute remarkably to the structural damping but little to the structural natural frequencies.

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Section: Influence Of Human Parameters: Numerical Resultsmentioning

confidence: 99%

Experimental and Numerical Investigation of the Effect of Standing People on Dynamic Properties of a Beam-Like Bridge

Xie

Liu

2017

Mathematical Problems in Engineering

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“…The experiments are performed on the footbridge of the Structures Laboratory at the University of Warwick for which the experimentally identified modal characteristics are discussed in [15]. As the footbridge is excited, either artificially using a shaker or through ambient excitation, the occupants are exposed to whole-body vibrations predominantly at the natural frequencies of the coupled structure.…”

Section: Experimental Identification Of the Human Body Model Parametersmentioning

confidence: 99%

Identification and Modelling of Vertical Human-Structure Interaction

Nimmen

Maes

Živanović

et al. 2015

Conference Proceedings of the Society for Experimental Mechanics Series

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Slender footbridges are often highly susceptible to human-induced vibrations, due to their low stiffness, damping and modal mass. Predicting the dynamic response of these civil engineering structures under crowd-induced loading has therefore become an important aspect of the structural design. The excitation of groups of pedestrians and crowds is generally modelled using moving loads but also the changes in dynamic characteristics due to human-structure interaction are found to significantly affect the footbridge response. The present contribution investigates the influence of the presence of the pedestrians onto the dynamic characteristics of the occupied structure by means of an extensive experimental study on a footbridge in laboratory conditions. The analysis shows that the natural frequencies slightly reduce due to the additional mass but more significant is the observed increase in structural damping. Similar observations are made on a in situ footbridge. This interaction is simulated using a coupled human-structure model in which the human occupants are represented by simple biomechanical models.

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“…Load spectrum coefficient describes the randomness of crane loading and can reflect the laws of loadings statistically as well as the loading status from the view of loading changes and use frequency of each typical load. In GB/T 3811, load spectrum coefficient is defined for calculation as [9]…”

Section: Load Spectrum Coefficientmentioning

confidence: 99%

Research on Energy-Saving Design of Overhead Travelling Crane Camber Based on Probability Load Distribution

Tong

Tang

Song

et al. 2014

Mathematical Problems in Engineering

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Crane is a mechanical device, used widely to move materials in modern production. It is reported that the energy consumptions of China are at least 5–8 times of other developing countries. Thus, energy consumption becomes an unavoidable topic. There are several reasons influencing the energy loss, and the camber of the girder is the one not to be neglected. In this paper, the problem of the deflections induced by the moving payload in the girder of overhead travelling crane is examined. The evaluation of a camber giving a counterdeflection of the girder is proposed in order to get minimum energy consumptions for trolley to move along a nonstraight support. To this aim, probabilistic payload distributions are considered instead of fixed or rated loads involved in other researches. Taking 50/10 t bridge crane as a research object, the probability loads are determined by analysis of load distribution density functions. According to load distribution, camber design under different probability loads is discussed in detail as well as energy consumptions distribution. The research results provide the design reference of reasonable camber to obtain the least energy consumption for climbing corresponding to differentP0; thus energy-saving design can be achieved.

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Design and Construction of a Very Lively Bridge

Cited by 8 publications

References 4 publications

Experimental and Numerical Investigation of the Effect of Standing People on Dynamic Properties of a Beam-Like Bridge

Experimental and Numerical Investigation of the Effect of Standing People on Dynamic Properties of a Beam-Like Bridge

Identification and Modelling of Vertical Human-Structure Interaction

Research on Energy-Saving Design of Overhead Travelling Crane Camber Based on Probability Load Distribution

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