| 桥上CRTSⅡ型板式无砟轨道纵连底座板受力计算模型比较 |
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| 作者单位： | ;1.成都大学建筑与土木工程学院;2.西南交通大学高速铁路线路工程教育部重点实验室 |
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| 摘 要： | 桥上CRTSⅡ型板式无砟轨道设计时采用"线-板-桥-墩"空间一体化模型计算纵向力,模型中轨道板与纵连底座板简化为一层复合结构。建立一种桥上CRTSⅡ型板式无砟轨道"线-板-板-桥-墩"空间一体化模型,将轨道板与纵连底座板分别模拟,并通过砂浆阻力相互作用,模型采用有限单元法求解。采用两种模型对一座大跨连续梁桥上纵连底座板的制动力和伸缩力进行对比计算。结果表明,纵连底座板的制动力和伸缩力采用"线-板-板-桥-墩"空间一体化模型的计算结果更小,纵连底座板配筋设计采用"线-板-桥-墩"空间一体化模型具有更高的可靠性。
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| 关 键 词： | CRTSⅡ型板式无砟轨道 底座板 受力模型 铁路桥梁 |
Comparison of Mechanical Model for Calculation of Longitudinally Connected Concrete Base Board |
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| Institution: | ,School of Civil Architecture & Engineering,Chengdu University,MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University |
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| Abstract: | Longitudinal forces are calculated by ‘rail-slab-beam-pier' three-dimensional mechanical model to design CRTS Ⅱ slab track on the bridge,and the slab and longitudinally connected concrete base board( LCCBB) are simplified to a composite layer in the model. In this paper,a ‘rail-slab-boardbeam-pier' three-dimensional mechanical model of CRTSⅡ slab track on bridge is established,in which slab and LCCBB are simulated respectively and interacted by resistance of mortar. The solution of the model is obtained with the finite element method. Based on two mechanical models,forces of LCCBB on a continuous beam bridge caused by train brake or bridge expansion are calculated contrastively. The results show that longitudinal forces of LCCBB caused by train brake or bridge expansion are smaller by using ‘rail-slab-board-beam-pier' three-dimensional mechanical model. The design of the reinforcement of LCCBB is much more reliable by using ‘rail-slab-beam-pier' three-dimensional mechanical. |
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| Keywords: | CRTSⅡslab ballastless track Base board Force model Railway bridge |
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