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Occasional Forces and Displacements of Longitudinally Coupled Ballastless Jointless Turnout on Bridges
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作者 任娟娟 刘学毅 《Journal of Southwest Jiaotong University(English Edition)》 2010年第1期1-7,共7页
For the longitudinally coupled baUastless turnout on Leida bridge on Wuhan-Guangzhou passenger dedicated line (PDL) in China, a turnout (cross over)-track slab-bridge deck-pier integrated finite element model was ... For the longitudinally coupled baUastless turnout on Leida bridge on Wuhan-Guangzhou passenger dedicated line (PDL) in China, a turnout (cross over)-track slab-bridge deck-pier integrated finite element model was established, in which two No. 18 jointless turnouts with movable frogs in form of crossover, longitudinally coupled ballastless track, bridges and piers were regarded as one system. Based on this model, the additional forces and displacement regularities of turnouts, track slab, bridges and piers under occasional loading were analyzed, and the effect of occasional loading position was researched. The results show that slab breaking is more influential on the longitudinal force and deformation of the whole system than rail breaking, that slab breaking on one line could deteriorate both the slab force on another line and the forces exerted on the piers and fastener components, and that a great slab force at the left end of the continuous bridge expansion joint should be particularly avoided in design. 展开更多
关键词 jointless turnout on bridge Longitudinally coupled ballastless track Occasional force Longitudinal displacement
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Force Path Analysis of Ballasted Jointless Bridge Turnout
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作者 张瑶 杨冠岭 +1 位作者 宋杨 王平 《Journal of Southwest Jiaotong University(English Edition)》 2010年第4期309-313,共5页
The action between bridge and ballasted jointless turnout on bridge is reversible. To locate the force path between them,the model of a jointless turnout on a 4×32 m continuous beam were calculated and analyzed. ... The action between bridge and ballasted jointless turnout on bridge is reversible. To locate the force path between them,the model of a jointless turnout on a 4×32 m continuous beam were calculated and analyzed. Also analyzed were factors of influence,such as:temperature increment,longitudinal pier stiffness,ballast resistances,and turnout and bridge layouts. 展开更多
关键词 Ballasted jointless bridge switch Force path Temperature increment
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Design and field tests of a deck-extension bridge with small box girder 被引量:9
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作者 Junqing Xue Bruno Briseghella +2 位作者 Jianhui Lin Fuyun Huang Baochun Chen 《Journal of Traffic and Transportation Engineering(English Edition)》 2018年第6期467-479,共13页
A jointless bridge could fundamentally eliminate vulnerable deck joints, thereby meeting the need for sustainable development of bridges, especially for an expressway with highspeed traffic. In this paper, one jointle... A jointless bridge could fundamentally eliminate vulnerable deck joints, thereby meeting the need for sustainable development of bridges, especially for an expressway with highspeed traffic. In this paper, one jointless bridge(deck-extension bridge) with a small box girder in an expressway was chosen as a case study to examine the structural design,construction and field test. The field tests of the bridge indicated that the designed and constructed structures can satisfy the requirement for service performance of the deckextension bridge. Some key technologies, such as the position of longitudinal reinforcements in the superstructure-approach slab connections and the arrangement of the sliding material layers, were introduced. The longitudinal thermal movement of the superstructure in the deck-extension bridge with a small box girder could be predicted accurately by using the average temperature of the cross section of a small box girder. The finite element model, built by using the MIDAS program, was used to analyze the temperature distribution on the cross section of a small box girder, the accuracy of which could be verified by comparing with the measured values. The maximum longitudinal thermal movement of the superstructure in deck-extension bridges with a small box girder under historically extreme temperature conditions was predicted. 展开更多
关键词 jointless bridge Deck-extension bridge Small box girder Longitudinal thermal movement Temperature distribution Average temperature
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