Table 1 - uploaded by Chul-Woo Kim
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Source publication
This study aims to investigate seismic responses and performance of straddle-type pre-stressed concrete (PC) bridges considering train load under moderate earthquakes. The study also examines how elastomeric bearings work for improving seismic performance of the bridge. All investigations were based on a three-dimensional dynamic response analysis...
Context in source publication
Context 1
... of the total mass of neighboring span (Ld in Figure 3) was also considered: 254.31kN for the conventional bridge and 345.55kN for the advanced bridge. Table 1 shows cross- sectional properties and mass per unit length of PC girders. Elastic properties of concrete and elastomeric bearings are summarized in Table 2. ...
Citations
... It was reported that when considering the train merely as additional mass, it may overestimate or underestimate the bridge response. By studying the seismic response and performance of straddle-type pre-stressed concrete bridges considering train load under moderate earthquakes, KIM et al [15] claimed that there is a damping effect for the high-speed train on the bridge during earthquakes. Recently, the analytical study of ZENG et al [16] confirmed that the particular position of the moving cars on the deck affects the response/safety of the vehicle significantly when an earthquake happens. ...
This paper focuses on understanding and evaluating the dynamic effect of the heavy-haul train system on the seismic performance of a long-span railway bridge. A systematic study on the effect of heavy-haul trains on bridge seismic response has been conducted, considering the influence of vehicle modeling strategies and dynamic characteristics of the seismic waves. For this purpose, the performance of a long-span cable-stayed railway bridge is assessed with stationary trains atop it, where the heavy-haul vehicles are modeled in two different ways: the multi-rigid body model with suspension system and additional mass model. Comparison of the bridge response in the presence or absence of the train system has been conducted, and the vehicle loading situation, which includes full-load and no-load, is also discussed. The result shows that during the earthquake, the peak moment of the main girder and peak stress of stay cables increase by 80% and by 40% in the presence of fully loaded heavy-haul trains, respectively. At the same time, a considerable decrease appears in the peak acceleration of the main girder. This proves the existence of the damping effect of the heavy-haul train system, and this effect is more obvious for the fully loaded vehicles. Finally, this paper proposes an efficient vehicle modeling method with 2 degrees of freedom (DOF) for simplifying the treatment of the train system in bridge seismic checking.
