FPR-混凝土粘结界面的规律

根据试验数据，研究了FRP与混凝土粘结的非线性模型Ⅱ界面规律。所提出的界面规律基于差分方程，并考虑了高剪应力下粘性剂和混凝土保护层的非线性作用。模型中的参数均在拉—拉剥离试验下校准，同时采用了不同荷载水平、不同粘结长度、沿FRP板方向的最大传递荷载与应变。通过有限粘结长度决定的最大传递荷载的估计值来确定界面规律中的断裂能，同时根据应变确定剪切－滑移关系。并通过一系列文献的试验结果验证参数优化程序。在粘结－滑移模型中采用所提出的界面定律进行数值模拟计算，得出粘结区域中FRP的应变、剪应力和滑移与试验结果很吻合。

An Experimental Study of the Mechanical Properties of Fibre Reinforced Polymer (FRP) and Steel Reinforcing Bars at Elevated Temperatures

This paper presents the results of an experimental study of the mechanical properties of FRP reinforcement bars, used as internal reinforcement in concrete structures, at elevated temperatures. Two types of FRP bars namely: carbon fibre reinforced polyester (CFRP) bars of 9.5 mm diameter and glass fibre reinforced polyester (GFRP) bars of 9.5 mm and 12.7 mm diameter were used in the study. For comparison, conventional steel reinforcement bars of 10 mm and 15 mm diameter were also tested. Results from the ex...