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本文以我国现存的大量的钢筋混凝土组合梁桥为研究对象,结合国内外研究资料,进行了组合T梁的室内试验。分析了其受力机理,提出了该类梁在开裂后,卸载并再次加载时的组合面粘结-滑移曲线的计算方法,编制了分析组合结构的RCCT程序。该程序能较好地反映此类梁开裂后的非线性受力状态,其计算结果与试验结果符合良好。应用本文方法可以分析和研究现存公路钢筋混凝土组合梁桥的实际承载能力。
In this paper, a large number of existing reinforced concrete composite beam bridges in our country are taken as research objects. Combined with the research data at home and abroad, indoor tests of combined T-beams are carried out. The force mechanism of the composite beam is analyzed. The calculation method for the bond-slip curve of the composite surface when the beam is unloaded and reloaded is proposed and the RCCT program for analyzing the composite structure is proposed. The program can well reflect the non-linear force state after cracking of beams, and the calculated results are in good agreement with the experimental results. This method can be used to analyze and study the actual carrying capacity of the existing highway reinforced concrete composite beam bridge.