轴压比对竖向荷载下预应力混凝土框架的影响

The Effect of Axial Compression on the Prestressed Concrete Frame under Vertical load

在预应力框架中轴压比除对结构的延性性能产生影响外,还将对框架内力产生影响。通过四组共24榀预应力框架的电算并结合已有的参考文献,分别从二阶效应、框架柱的轴向变形及与普通混凝土框架比较三个方面研究和探讨了轴压比对只承受竖向荷载作用的预应力框架的影响。研究表明,轴压比对只承受竖向荷载作用的预应力框架的影响与普通混凝土框架基本一致,但也存在一些自身特点。总体上来说,轴压比对预应力框架的影响较普通混凝土框架显著,但通常情况下影响仍较小。

For prestressed frames, the axial compression ratio will affect not only the ductility of structures but also the structural internal force.Based on the computer-calculation for four groups of 24 prestressed frames combined with the references, in this paper, the effects of axial compression ratio on the prestressed frames are studied and discussed through three aspects: the second-order effect, the axial deformation of frame-columns and the comparison with ordinary concrete frames.The study results show that the effects of axial compression ratio on the prestressed frames and the ordinary concrete frames are basically consistent, but there are some self-born characteristics.As a whole, the effect of axial compression ratio on the prestressed frames is more notable than that on the ordinary concrete frames, but under common situation the effect is small.