| 摘要: |
| 通过对大跨预应力混凝土渡槽结构上拱度的分析认为，预应力、恒载、弹性模量、混凝土的收缩和徐变等是影响卜拱度的主要因素，而上拱度的预测主要取决于对混凝土徐变的合理估算；为了防止上拱度过大对结构使用性能的影响，提出对上拱度的控制应采用降低预应力和减小徐变相结合的措施。 |
| 关键词: 预应力混凝土 梁式渡槽 上拱度 |
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| Analysis and control on the deflection upwards of large prestressed concrete aqueduct |
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| Abstract: |
| The main factors influencing the deflection upwards are prestressed force,dead load,concrete elasticity modulus,shrinkage and creep through analysis of the deflection upwards of large prestressed concrete aqueduct.The prediction of the deflection upwards lies on rational estimate of concrete creep.The measures to control deflection upward are brought forward in order to prevent deflection upwards excessively and causing failure of service.The countermeasure is the combination of reducing prestressed force and creep of concrete. |
| Key words: prestressed concrete aqueduct deflection upwards |
