- 摘 要
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（東南大學交通學院 南京 210096）
【提要】 基于CB殼單元，采用層狀模型模擬預(yù)應(yīng)力混凝土結(jié)構(gòu)，考慮材料和幾何雙重非線性效應(yīng)，有效地模擬了三跨連續(xù)斜交箱梁的開裂、屈服和失效的全過程。結(jié)果表明，CB殼單元模型對于預(yù)應(yīng)力混凝土箱梁的非線性分析有良好的適應(yīng)性，對箱梁開裂后的使用性能評估有實際應(yīng)用價值?；诜蔷€性計算分析了箱梁在開裂后的剛度及裂縫的位置和發(fā)展情況，探討了混凝土和預(yù)應(yīng)力鋼筋在斜交箱梁開裂后的應(yīng)力發(fā)展規(guī)律，得出了若干有益的結(jié)論。
【關(guān)鍵詞】 預(yù)應(yīng)力混凝土 斜交箱梁 開裂 非線性 CB殼單元 層狀模型
Nonlinear Analysis on Prestressed Concrete Continuous Skew Box Girder/Zhang Feng，Ye Jianshu （Transportation College，Southeast University，Nanjing 210096，China）
Abstract:Using CB shell element and layered model，the behaviors of cracking，yielding and destroying procedures of a threespan PC continuous skew box girder are analyzed considering the material and the geometry nonlinearity. The results show that the CB shell element could describe the nonlinear behavior of box girders well and be valuable to evaluate the serviceability of the cracked box girder. The stiffness and the stress redistribution of the box girder are researched based on the computation.The developing rule of the stress of the concrete and the rule of the steel are researched after the skew box girder cracking are researched. Some useful conclusion are drawn based on the analysis.
Keywords:prestressed concrete； skew box girder； crack； nonlinearity； CB shell element； layered model
*江蘇交通科學研究項目（04Y051）。
