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
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.
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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