纤维增强塑料筋混凝土梁抗弯设计数值分析

Numerical analysis of flexural design of concrete beams reinforced with FRP bars

为预测纤维增强塑料筋(FRP筋)混凝土梁在受弯工作过程中弯矩和挠度的发展情况,从而为FRP筋混凝土梁的抗弯设计提供依据,采用对构件正截面进行分层的方法,根据极限强度理论、应变协调条件和内力平衡条件,对构件的弯矩-曲率关系和荷载-挠度关系进行了数值计算,并编写计算代码,设计图形用户界面(GUI)。理论计算结果与试验结果的比较说明,采用极限强度理论可以较好地预测FRP筋混凝土梁的极限弯矩,对于FRP筋混凝土梁短期挠度的计算,ACI模型的计算结果过小,Faza&GangaRao模型可以较好地预测构件在正常使用极限状态下的短期挠度,所采用的数值计算方法则可以较好地预测构件在短期荷载作用下的极限挠度。各种挠度计算方法之间的对比表明,所采用的数值计算方法更加适合于FRP筋混凝土梁短期挠度的求解。

For predicting the development of moments and deflections so as to get a good flexural design,the strip method was used in the force analysis.The ultimate strength theory,the equilibrium and compatibility conditions were adopted,and the moment-curvature and load-deflection relationship were solved using a numerical method,and the computation codes as well as a GUI program were proposed for the solutions.The comparison between theoretical results and experimental results shows that the ultimate strength theory is well applicable to the prediction of flexural strength of concrete beams reinforced with FRP bars,for the calculation of short-term deflections of concrete beams reinforced with FRP bars,the result of ACI model is too small compared to experimental results,the FazaGangaRao model is more suitable under service loads.The numerical method is more suitable under ultimate loads,and the comparison among these methods indicates that the numerical method is more suitable for the solution of short-term deflections of concrete beams reinforced with FRP bars.3 tabs,5 figs,16 refs.