| Civil Engineering |
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| Calculation of long-term slippage for externally prestressing steel-concrete composite beam |
| XIANG Yi-qiang, HE Chao-chao, QIU Zheng |
1. Department of Civil Engineering, Zhejiang University,Hangzhou 310058, China；
2. Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University, Hangzhou 310058, China |
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Abstract
At present, the current design code for steel-concrete composite girder bridge has not considered the effect of the shrinkage and creep on the interface slippage in the slip calculation method. Under the assumption of linear slip and no debonding between steel girder and concrete, the expression of slippage was deduced by considering the long-term performance of concrete deck and prestressing effect for composite beam bridges with external prestressing. The slippage of a typical simply-supported composite beam was analyzed and the values were compared with the results by other methods. Results show that the proposed method and formulas are reasonable and valid. Further parameter study confirms that interface slippage between steel and concrete will increase with time when taking the long-term performance of concrete into consideration. The slippage of simply-supported composite beams increases gradually from the middle to the two ends of beam and is up to the maximum at the ends of the beam. When the prestressing steel-concrete composite beams are designed, in addition to considering the positive effect of prestressing on composite beam deflection, attention should pay to the negative influence on the slip of prestressing composite beam.
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Published: 25 April 2017
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Cite this article:
XIANG Yi-qiang, HE Chao-chao, QIU Zheng. Calculation of long-term slippage for externally prestressing steel-concrete composite beam. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(4): 739-744.
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体外预应力钢-混组合梁长期滑移计算
针对现行规范中钢-混组合梁桥设计时界面滑移未计入混凝土收缩徐变效应的影响,在线性滑移和混凝土钢梁之间无掀起的假定下,推导综合考虑桥面板混凝土长期性能和施加预应力影响的体外预应力钢-混组合梁桥的滑移计算公式.通过对某一典型简支钢-混组合小箱梁黏结滑移的计算及结果比较,证明提出的方法及推导公式的正确性.参数研究结果表明,当考虑混凝土收缩徐变长期性能的影响时,钢-混组合梁的界面滑移会随着时间和预应力的增加而不断增加；简支组合梁的滑移量一般由中间向梁两端逐渐增大,在梁两端滑移量达到最大值.在预应力钢-混组合梁的设计中,除考虑预应力对组合梁变形有利的方面外,还应注意和控制预应力对组合梁界面滑移不利的影响.
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