Abstract
Human-induced vibration has become a serious serviceability problem due to the larger opening of girder, lighter floor systems and longer spans designed and used in practice. Vibration tests were undertaken in laboratory to research the vibrational characteristics of the arch pre-stressed concrete truss (APT) system spanning 16.0 m. Results from ambient vibration, impulse excitations (heel-drop and jumping) and steady-state incentives (walking and running) were presented. Dynamic characteristics such as natural frequencies, damping ratios, mode shapes and acceleration responses were studied and checked against the existing codes. Experimental results show that the investigated APT girder possesses high fundamental frequency and low damping ratio. Moreover, the perception factors based on the root-mean-square acceleration, vibration dose value (VDV) and psychological comfort data were obtained. Lastly, the threshold accelerations and VDVs were suggested for evaluating the human-induced vibration.
Highlights
The developed large-span arched prestressed concrete truss (APT) girder [1] is a modern efficient structural form that combines a reinforced concrete (RC) arch, the RC floor and prestressed concrete (PC) truss, which consists of RC upper chord, PC lower chord, RC webs (Fig. 1)
This paper mainly focuses on the vibration serviceability evaluation of this APT structure
Casagrande, Giongo, Pederzolli, et al [13]. The purposes of this experimental study on APT were to evaluate the vibration behavior of such structure caused by human activities and to check its vibration performance against the current design specifications
Summary
The developed large-span arched prestressed concrete truss (APT) girder [1] is a modern efficient structural form that combines a reinforced concrete (RC) arch, the RC floor and prestressed concrete (PC) truss, which consists of RC upper chord, PC lower chord, RC webs (Fig. 1). The large web openings can accommodate for pipelines such as heating ventilating and air conditioning pipes, water supply pipes and electric/network cables [2]. This arrangement can eliminate a significant amount of dead space, but requires a more compact and economical design including the vibration assessment, the structural calculation and other considerations. This paper mainly focuses on the vibration serviceability evaluation of this APT structure. It appears that for long or light structures the vibration serviceability issue due to human activity has become a greater concern. The health risks predicted by the root-mean-square (RMS) and maximum transient vibration
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