摘要
本文通过五根外伸梁及一根二跨连续的组合梁负弯区抗剪试验,解释了负弯区截面抗剪强度比塑性计算值有所提高的原因。并通过力比、剪力比的参数变化分析了负弯区截面的强度破坏情况及极限荷载、使用荷载限值。同时,还提出了负弯区强度破坏与局部屈曲破坏间的界线,连续梁负弯区极限抗剪能力对弯距调幅的影响等问题作了初步分析。
Based on the experimental results of five cantilever composite beams of different force ratios and shear ratios and one continuous composite beam, a study on the shear strength under negative bending is conducted.The boundary line between the strength failure and the local buckling is given. The reason for which the shear strength under negative bending is higher than that carried by the web of steel beam in composite beam is analysed The influence of shear strength of sections at intermediate supports of continuous beams on the moment redistribution is also dicussed.
关键词
抗剪强度
连续组合梁
试验
shear strength
continuous composite beams
force ratio
shear ratio
