研究目的:在连续梁桥悬臂施工中，墩顶临时固结一般视为刚性体，计算原理较为简单，方法比较成熟。而对于墩旁临时固结，应当视为弹性体而非刚性体，目前虽然有多种简化计算方法，但这些方法均存有诸多不足之处。本文通过对墩旁临时固结的力学分析，提出一套能适合各类工况、满足工程施工精度要求且较为简单的计算方法。研究结论:(1)把墩旁临时固结简化为弹性三支点计算模型是与其实际受力状态相一致的；(2)基于弹性三支点计算模型所提出的简化计算方法，能够满足各种工况的计算需要；(3)墩旁临时固结轴力的计算与其拉压刚度是否相同密切相关，应根据临时支撑拉压刚度的大小和实际受力状态选取相应的计算公式；(4)本文给出的计算方法可为我国PC悬浇梁墩旁临时固结的设计提供方法和依据。
Abstract
Research purposes:The temporary consolidation at top piers is regarded as rigid body in continuous girder cantilever construction. And the calculation theory and method are mature. Whereas, temporary consolidation beside piers should be regarded as elastic body. And the calculation methods about it are insufficient. Through the mechanical analysis of temporary consolidation beside piers, a simple calculation method is proposed and can be applied in various construction conditions.Research conclusions:(1) Simplify the temporary consolidation beside piers as elastic three fulcrums model which is consistent with practical force-baring conditions. (2) Calculation method based on elastic three fulcrums model can be well applied in various construction conditions. (3) Calculation of axial forces temporary consolidation beside piers is well related to their tension-compression stiffness, and we should choose calculation formula based on their tension-compression stiffness and force-baring conditions. (4) The calculation method proposed can be the base and accordance for design of temporary consolidation beside piers in PC cantilever casting girders.
关键词
墩旁 /
临时固结 /
悬臂
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Key words
beside piers /
temporary consolidation /
cantilever
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中图分类号：
U45
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参考文献
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