Shaking Table Test Research on the Influence of Center-Hung Scoreboard on Natural Vibration Characteristics and Seismic Response of Suspen-Dome Structures

Abstract

The center-hung scoreboard is a large electronic display device, that usually has a significant weight and is flexibly suspended from the roof of the gymnasium. The suspen-dome structure is one of the common roof structures of gymnasiums. In order to investigate the effect of the center-hung scoreboard on the natural vibration characteristics and seismic response, including acceleration, displacement, and strain, of the suspen-dome structure and considering that the dynamic behavior of the structure under seismic action can be realistically reflected, a shaking table test was carried out based on the suspen-dome structure of the Gymnasium of the Lanzhou Olympic Sports Center. Firstly, according to the size of the shaking table, a dynamic scale model with a geometric similarity ratio of 1:20 was established. After that, the white noise excitation test and numerical modal analysis were conducted on the models with and without the center-hung scoreboard to compare the two modes’ natural vibration characteristics. Furthermore, the earthquake simulation test was carried out on the models with and without a center-hung scoreboard, and their various seismic responses, including acceleration, displacement, and strain, were compared and analyzed. Finally, the acceleration response and displacement response of the center-hung scoreboard were investigated. The results show that the higher-order natural frequencies of the suspen-dome structure will increase when the center-hung scoreboard is suspended from the roof, and the swing of the center-hung scoreboard will be excited first in the low-order mode. In addition, the various seismic responses, including acceleration, displacement, and strain, of the model with the center-hung scoreboard are all increased compared to the model without the center-hung scoreboard. Meanwhile, the influence of the center-hung scoreboard on the seismic response of the suspen-dome structure decreases from the inner ring to the outer ring of the structure. Moreover, under the action of an earthquake, the acceleration response and displacement response of the center-hung scoreboard are both extremely high. Considering the center-hung scoreboard in the analysis and design stage of the suspen-dome structure is necessary.

On the Seismic Performance of the Single-Layer Reticulated Shell with a Center-Hung Scoreboard under Multiple Seismic Excitations

“…However, this study only focuses on the suspend-dome structure, and the research on single-layer spherical reticulated shells has not been involved. [26,27].…”

Effect of the CHS on Seismic Responses of the Single-Layer Spherical Reticulated Shell under Vertical Seismic Motions

“…In practice, a safety distance of about 1.0 m is reserved between the CHS and the support platform, and a sling length is selected every 0.5 m among 1.0 m and 9.0 m. Te length of the sling is taken as 0.0 m when the CHS is simplifed as fxed masses on the suspension nodes on the support platform. Since most of the CHSs used in recent years exceed 20 t and the heaviest ones have exceeded 55 t [23,24], the weight is selected every 5 t among 20 t and 60 t.…”

“…In the past decade, with the development of professional sports events and other activities, the number of center-hung scoreboard (CHS) applications has increased signifcantly [23]. Te CHS is a large display device hanging in the center of the roof structure, and the heaviest CHS is about 55 t [24]. Xue et al conducted a shaking table test on a 94 m suspendome structure with a 30 t CHS and found that the CHS made a great increase on axial forces and node acceleration under seismic motions [25,26].…”

Non-Linear Behaviour and Analysis of Innovative Suspension Steel Roof Structures

“…Additionally, the modulus of elasticity of the spiral wire ropes is lower than that of structural steel, which increases their deformability [21,22]. It should be noted that the cylindrical surface of such suspension structures complicates their construction, operation, and maintenance, especially under wind loads [23][24][25]. Dynamic loads also have a great influence on the behaviour of suspended structures [26,27].…”