预应力碳纤维板加固二次受力受弯构件的试验研究

以往的预应力碳纤维板加固受弯试验大多建立在结构“一次受力”的基础上,本文从加固工程中结构大多为“二次受力”的实际情况出发,试验研究预应力碳纤维板加固“二次受力”钢筋混凝土受弯结构。作者利用柳州欧维姆机械股份有限公司开发的预应力碳纤维板专用锚具的基础上,完成了2根预应力碳纤维板加固的试验梁、1根非预应力碳纤维板加固的试验梁受弯构件的模型试验。研究了预应力碳纤维板加固的试验梁的受力性能。研究了预应力碳纤维加固对试件承载力、使用阶段变形、碳纤维应用效率及延性的影响。试验结果表明：预应力碳纤维板加固可显著提高受弯构件开裂及屈服荷载,减小构件使用阶段内的变形,充分利用碳纤维材料性能,对延性下降趋势加强设计。

Experimental study on the reinforcement of secondary flexural members with prestressed carbon fiber plates

In the past, prestressed carbon fiber plate reinforcement bending tests were mostly based on the "first load" of the structure. In this paper, prestressed carbon fiber plate reinforcement "second load" of the reinforced concrete bending structure is studied experimentally from the actual situation that the structure is mostly "second load" in the reinforcement engineering. On the basis of the special anchorage for prestressed carbon fiber plate developed by Liuzhou Overwem Machinery Co., LTD., the author completed the model test of the flexural members of 2 test beams reinforced by prestressed carbon fiber plate and 1 test beam reinforced by non-prestressed carbon fiber plate. The mechanical properties of test beams reinforced by prestressed carbon fiber plates are studied. The effects of prestressed carbon fiber reinforcement on the bearing capacity, deformation, application efficiency and ductility of the specimens were studied. The test results show that the prestressed carbon fiber plate reinforcement can significantly increase the cracking and yield load of the flexural members, reduce the deformation of the members during the use stage, make full use of the properties of carbon fiber materials, and strengthen the design against the decreasing trend of ductility.