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首页> 外文期刊>Materials and structures >Crack behavior of concrete beam in flexure strengthened with NSM prestressing screw-thread steel bars
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Crack behavior of concrete beam in flexure strengthened with NSM prestressing screw-thread steel bars

机译：NSM预应力螺纹钢筋强化混凝土梁的裂纹行为

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摘要

The cracking of concrete plays a vital important role for the serviceability and durability of reinforced concrete (RC) structures in terms of the structural behavior. To investigate the crack behavior of concrete structure with additional strengthening, monotonic four-point bending test was carried out for RC beams which strengthened with near surface mounted (NSM) prestressing screw-thread steel bars (PSB). Detailed description of the strengthened beams was presented, particularly on the crack initiation and propagation, the distribution, even the crack width and length, based on the deformation fields obtained from the non-contact digital image correlation (DIC) method. In addition, the relationship between the crack width and the damage level was discussed, and based on the results a crack-based damage assessment method for NSM strengthened members was proposed. The results reveal that the beam strengthened with NSM PSB steel bars demonstrated higher load carrying capacity than the reference beam. The prestressing application could significantly increase the cracking load thus delaying the initiation of cracks. The beams NSM strengthened with prestressed bars exhibited more flexural cracks in the constant moment region with a smaller crack width and spacing compared to the specimen without prestress. Furthermore, the crack-based damage assessment method proposed in this paper was demonstrated to be feasible to NSM strengthened beam for determining the damage status and repairability with simple operation.
机译：混凝土的开裂在结构行为方面对钢筋混凝土（RC）结构的可用性和耐久性起着至关重要的重要作用。为了研究混凝土结构的裂缝行为与额外的强化，对RC梁进行了单调的四点弯曲试验，该RC横梁进行了近表面安装（NSM）预应力螺纹钢筋（PSB）。提出了强化光束的详细描述，特别是基于从非接触数字图像相关（DIC）方法获得的变形场的裂纹启动和传播，分布，即使是裂缝宽度和长度。此外，讨论了裂缝宽度与损伤水平之间的关系，提出了一种基于结果，提出了NSM加强成员的裂缝损伤评估方法。结果表明，利用NSM PSB钢筋加强的光束显示比参考光束更高的负载承载力。预应力应用可以显着增加裂缝负荷，从而延迟裂缝的启动。通过预应力条加强的光束NSM在恒定的瞬间区域中表现出更多的弯曲裂缝，与没有预应力的样品相比，具有较小的裂缝宽度和间隔。此外，本文提出的基于裂缝的损伤评估方法是对NSM加强光束可行的，用于确定损坏状态和操作简单。

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