预应力度对预应力混凝土框架梁抗震性能的影响

Effect of partial prestressing ratio on seismic behavior of prestressed concrete frame beam

论述了预应力度在预应力混凝土框架梁抗震概念设计中的易混淆之处,强调了相对受压区高度与预应力度在设计中的主次关系,提出了预应力混凝土框架梁抗震设计的新思路。建议设计时,以相对受压区高度为主要控制指标,并放松预应力度限制。

This paper discusses the misunderstanding of partial prestressing ratio in the seismic conceptual design of the prestressed concrete frame beam.It emphasizes the primary and secondary relationship between the relative height of compression zone and partial prestressing ratio in the design.A new idea of seismic design of the prestressed concrete frame beam is put forward.It is suggested that the relative height of compression zone should be taken as the main control index and partial prestressing ratio should be loosened.