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| 动力荷载作用下预应力混凝土靠船桩变形性能理论及数值分析 |
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涂忠仁1,尹健2,荣耀3
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1. 清华大学,水沙科学与水利水电工程国家重点实验室,北京,100084;重庆交通大学,河海学院,重庆400074
2. 重庆交通大学,河海学院,重庆400074
3. 江西交通工程质量监督站,江西,南昌,330008
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| 摘要: |
| 结合靠船桩工作特点,提出了考虑内外阻尼效应的靠船桩动力理论分析方法,并采用数值分析手段,分析了动力荷载作用下混凝土强度、初始预应力及荷载作用位置对预应力混凝土靠船桩变形、抗裂性能的影响.结果表明,高强度混凝土靠船桩受预应力水平影响大,但当高初始预应力与低荷载作用位置组合时,混凝土等级变化对靠船桩极限变形能力影响较小;预应力混凝土靠船桩开裂荷载与荷载作用位置关系密切,当荷载作用位置较高时,桩身开裂后很快就丧失承载能力而发生破坏;初始预应力水平对低强度混凝土(C50)靠船桩的极限变形能力影响小,而对等级较高混凝土(C60、C70)靠船桩极限变形能力影响较大. |
| 关键词: 动力荷载 靠船桩 瑞利阻尼 多自由度 变形性能 |
| DOI： |
| 分类号:U641.36 |
| 基金项目: |
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| Theoretical and numarical analyses of deformation property of prestressed berthing pile under dynamic load |
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TU Zhong-ren1,YIN Jian2,RONG Yao3
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TU Zhong-ren1,2,YIN Jian2,RONG Yao3(1.State Key Laboratory of Hydroscience , Engineering,Tsinghua University,Beijing 100084,China,2.School of River , Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,3.Jiangxi Quality Supervising Station of Transportation Engineering,Nanchang 330008,China)
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| Abstract: |
| Considering berthing pile working characteristic,a theoretical analysis equation including interior and exterior damp effects is proposed in this paper.Influence of concrete strength together with initial prestress and load-location on the deformation property and anti-crack property is studied by use of numerical calculation method.Research results show that the deformation property of the berthing pile with high concrete strength can be more easily influenced by initial prestress,and that concrete strengt... |
| Key words: dynamic load berthing pile Rayleigh damping multi-degree-of-freedom(MDOF) deformation property |
