Design and Experimental Study of a Gap-type Integrated Energy Dissipating Anti-falling Beam Device
LEI Guangyi
LI Chong
SHEN Danyang
JIA Junfeng
WANG Zhiqiang
Abstract：In order to solve the problem of excessive displacement of main girders and falling girders in small and medium-span girder bridges under strong earthquakes,a gap-type integrated energy dissipation and anti-falling girder device was proposed in this paper,with the aim of realizing the functions of energy dissipation and damping under small and medium-span earthquakes and limiting the position under strong earthquakes,as well as meeting the demand for small displacements caused by temperature effects in normal use.Firstly,the hysteretic behavior of the device was investigated through variable amplitude cyclic loading tests to analyze its energy dissipation effect.Then,the relationship between the damping force of the device and the loading rate was investigated by low and fast performance tests.After that,the fatigue performance of the device under seismic action was verified by fatigue tests.Finally,the effects of different friction materials on the mechanical properties of the device were investigated.The results show that the hysteresis curve of the proposed energy dissipating anti-falling beam device is full and the energy dissipation is stable.The polytetrafluoroethylene material shows better stability,and the damping force of the device is basically unchanged under various loading rates,but the damping force is smaller.On the contrary,the two selected polyester materials can produce large damping force,but damping force of the device decreases with the increase of loading rate,and the maximum decreases are 13.4％and 24.1％,respectively,and the damping force decreases by about 21.3％and 28.4％in fatigue tests.The proposed new anti-falling beam device,with obvious gap characteristics,reduces the requirement for durability of the friction material and can provide a more economical option for vibration damping limiters.
Keywords：gap-typefriction energy-consuminganti-falling beammechanical performance testfriction material
Publication Date：2025-10-25
Online Publishing Date：2025-11-17(First online date of this platform, not the publication date of the document)
Pages：9( 70-77,95 )