疲劳荷载作用下部分预应力混凝土梁的挠度研究

Study on Deflection of Partially Prestressed Concrete Beams Under Fatigue Loading

通过对2根先张折线形配筋部分预应力混凝土梁与1根后张有黏结部分预应力混凝土梁的疲劳试验,进行了疲劳荷载作用下平截面假定的验证,分析了其挠度随着疲劳循环次数增加的变化规律,探讨了部分预应力混凝土梁在疲劳荷载作用下挠度的计算方法和计算公式.结果表明,按本文提出的公式计算的结果与试验结果符合较好.

Through the fatigue test on deflection of 3 partial prestressed concrete beams,2 fold -line pre -tension prestressed beams and 1 post - tensioned pre - stressed concrete beam,the paper validates the assumption of the flat section under fatigue load, and describes the law that deflection changes with increasing load circle degrees. It also discusses the calculation methods and formulae of deflection of partially prestressed concrete beams under fatigue load. The calculation results are in good agreement with the experimental results.