RC梁正截面设计的进一步研究

Further research on normal section design of RC beams

对 RC梁正截面设计公式进行了深入的研究 ,根据平截面假定推出了受压区高度很小时梁配筋量计算的公式 ,并与规范公式进行了比较 .指出了当受压区高度很小时梁的破坏并非所谓传统的适筋破坏 ,而是因受拉纵筋变形过大所致 ,从理论上澄清了梁在此情况下的破坏机理 .

The formula of the normal section design for RC beams is deeply studied.Based on the plane hypothesis,a set of formulas were derived for the design of RC beams with very small depth of compression zone.Comparison was made between the proposed formulas and those in the code.It is pointed out that when the depth of compression zone is very small,the failure of RC beam is not the so called traditional break under reinforced failure,instead,the excessive deformation of longitudinal reinforcement,hence the failure mechanism of RC beams in this case has been clarified.