不同施工方法下预应力混凝土连续梁弯曲性能试验研究

为研究不同施工方法下预应力混凝土连续梁的弯曲性能、极限受力状态及内力重分布规律,进行了3根连续梁模型试验,分别考虑一次落架、简支变连续和悬臂施工3种施工方法。通过试验数据分析,得到混凝土应变、钢筋应变和梁的内力重分布随荷载的变化规律。结果表明:不同施工方法会影响内力重分布的模式,但不影响结构的破坏模式,最终结构的延性将使不同施工方法梁的极限承载力趋近一致。

Experimental Study of Flexural Behavior of Prestressed Concrete Continuous Beams Cast by Different Construction Methods

To study the flexural behavior,ultimate bearing state and laws of internal force redistribution of prestressed concrete continuous beams cast by different construction methods,the model tests for three pieces of the continuous beams were carride out,in which three kinds of the construction methods,such as those of lowering formwork supports at one time,transferring simply-supported structure into the continuous one and casting the beam by cantilever construction,were considered.Based on the analysis of data of the tsests,the strain of concrete and reinforcement and laws of the internal force redistribution of the beams varying with different loads have been obtained.The results indicate that the different construction methods will have influence on the mode of the internal force redistribution,however,the methods will not cause influence on the mode of structure failure,and the ductility of the final structure will make the ultimate bearing capacity of the beams cast by the different methods get close to an identity.