Abstract
In order to study the stress of two new types of rigid hangers (circular steel and flat-plate rigid hangers) on the railway arch bridges, a finite element model of a railway through arch bridge was established. The influences of different types and sizes of hangers on the dynamic characteristics of the bridge were compared. Based on the established vehicle-bridge coupling vibration model, the influences of circular steel and flat-plate hanger sizes on the stress amplitude of hanger were discussed when the train passes through the bridge. The results show that when the flexible hanger of arch bridge was replaced by the rigid hanger, the symmetrical vertical bending frequency of bridge significantly increased. With the change of the size of flat-plate hanger, the torsional mode of the bridge was doped with the local vibration of the flat-plate hanger. With the increase of circular steel hanger diameter, the maximum stress amplitude of the hanger decreases as a whole. As for the flat-plate hanger, when the long side size b is the same, the maximum stress amplitude of the hanger decreases with the increase of the short side size d. When the short side size d is the same, with the increase of the long side size b, the maximum stress amplitude of the shorter hanger decreases, and the maximum stress amplitude of the longer hanger increases. When the size of the flat-plate hanger is too small or too large, the maximum stress amplitude is large.
Highlights
With the spans of the bridge increasing further, the slenderness ratios of some key components on the bridge enlarge
The stress amplitude of the hanger is the difference between the maximum stress and the minimum stress when the train passes through the bridge
It can be seen from the table that the maximum stress amplitude of the hanger decreases with the increase of the diameter
Summary
With the spans of the bridge increasing further, the slenderness ratios of some key components on the bridge enlarge. As railway transportation has the characteristics of heavy loads and obvious vehicle-induced vibration, the large structural stiffness and high durability of both overall structure and components are often required [9,10,11]. STRESS ANALYSIS OF RIGID HANGER OF RAILWAY ARCH BRIDGE BASED ON VEHICLE-BRIDGE COUPLING VIBRATION. Comparing to the flexible hanger, the rigid hanger have the advantages of large stiffness but the remarkable durability as well, which would bring about the great applications to the railway arch bridges. To study the stress of the two novel rigid hangers caused by the vehicle passing the bridge, the dynamic analysis of the vehicle-bridge coupling system is urgently needed. Based on the vehicle-bridge coupling vibration model, the stress amplitudes of hanger during train passing the bridge were studied
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