| 大跨度无碴轨道连续梁桥后期变形控制方法 |
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| 引用本文： | 侯文崎,叶梅新,曹建安. 大跨度无碴轨道连续梁桥后期变形控制方法[J]. 华中科技大学学报(自然科学版), 2011, 0(7): 109-112,127 |
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| 作者姓名： | 侯文崎 叶梅新 曹建安 |
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| 作者单位： | 中南大学土木建筑学院; |
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| 基金项目： | 铁道部科技研究开发计划资助项目(2006G009-C-2) |
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| 摘 要： | 预应力混凝土连续梁后期变形将影响无碴轨道线路平顺性,针对这一问题,以某新建高速铁路大跨度无碴轨道预应力混凝土连续刚构桥为例,通过有限元分析,对比研究了不同后期变形控制方法的控制效果,提出了后期变形联合控制措施.结果表明:延长铺轨时间、预留后张索、设计体外索等方法均可有效减小桥梁的后期变形.铺轨时间以延长0.5a为宜,后张索和体外索可根据桥梁实际变形情况分批张拉.应用联合控制措施,成桥铺轨20a后,桥梁中跨和边跨的后期变形分别被控制在21.9mm和12.8mm内,远小于规范限值.
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| 关 键 词： | 无碴轨道 后期变形 变形控制 预应力混凝土连续梁桥 体外索 后张钢束 |
Control method for long term-deformations of long-span continuous bridges with ballastless tracks |
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| Affiliation: | Hou Wenqi Ye Meixin Cao Jian′an(School of Civil Engineering and Architecture,Central South University,Changsha 410075,China) |
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| Abstract: | Long term-deformation of pre-stressed concrete continuous girders affect the smoothness of non-ballast tracks.Taking an example,a newly-built high speed railway long-span pre-stressed concrete continuous rigid frame bridge with ballastless track was studied,and the effects of different methods on the later-stage deformation control were compared through FEA(finie element analysis).Then,a set of coordinate control measures was put forward.Results show that extending track laying time,reserving post-tensioned... |
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| Keywords: | ballastless track long term-deformation deformation control pre-stressed concrete continuous bridge external tendons post-tensioned cables |
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