FRP加固钢筋混凝土梁实用刚度模型

AN APPLICABLE STIFFNESS MODEL OF RC BEAMS STRENGTHENED WITH FRP SHEETS

为了解决正常使用荷载下FRP加固钢筋混凝土梁的变形预测问题,本文基于刚度解析法建立了该类构件的实用刚度解析模型,模型中引入了β和λ两个参数分别用以考虑FRP使受拉钢筋和受压混凝土变形减小从而对构件刚度的影响。然后利用该模型预测了加固构件的跨中挠度,并与实测结果进行了比较,两者之间吻合很好。研究表明,加固梁的刚度随FRP用量的增加而提高;所提出的刚度模型简单实用并具有较高的预测精度,可以作为工程设计的参考。

In order to predict the deformability of RC beams strengthened with FRP sheets, an applicable stiff- ness model is drawn based on stiffness analysis method. In this model, the contributions of FRP to stiffness are con- sidered by introducing two parameters/3 and A which denote the reduction of steel strain in tension and concrete strain in crush due to the application of FRP, respectively. The midspan deflections given by this proposed model are compared and shown to agree well with the results from the experimental study. The results show that the stiffness of beam is improved with the increase of FRP amount, and that the proposed stiffness model is simple and practical and has satisfying precision, so it can work as a reference for engineering design.