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通过对9根不同纵筋配筋率的钢筋混凝土试验梁进行加载试验,研究了纵筋配筋率对钢筋混凝土框架梁拱效应的影响以及拱效应条件下钢筋混凝土框架梁的极限承载力。试验结果和理论分析表明,钢筋混凝土框架梁中的拱效应可以使构件的极限承载力提高1倍左右;纵筋配筋率越低,极限承载力提高的幅度越显著。为提高拱效应的作用,宜将钢筋混凝土框架梁的纵筋配筋率控制在1.5%以内。
Through the loading tests of nine reinforced concrete test beams with different longitudinal reinforcement ratio, the effect of longitudinal reinforcement ratio on the arched effect of reinforced concrete frame and the ultimate bearing capacity of reinforced concrete frame beam under arch effect were studied. The test results and theoretical analysis show that the arch effect in the RC frame beam can increase the ultimate bearing capacity of the members about one time. The lower the longitudinal reinforcement ratio, the more significant the ultimate bearing capacity increases. In order to improve the effect of arch effect, the longitudinal reinforcement ratio should be controlled within 1.5% of the reinforced concrete frame beam.