Experimental investigation on shear behavior of FRP post-tensioned concrete beams without stirrups
Experimental investigation on shear behavior of FRP post-tensioned concrete beams without stirrups
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DOI：
10.1016/j.engstruct.2021.112835
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发表时间：
2021-10
影响因子：
5.5
通讯作者：
Fei Peng;Weichen Xue
中科院分区：
文献类型：
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作者：
Fei Peng;Weichen Xue
为了研究纵向纤维增强聚合物（FRP）钢筋和无箍筋后张混凝土梁的抗剪性能，7个大型梁，剪跨有效高度比约为3.0，进行了试验。试验变量包括预应力水平、抗弯钢筋类型和钢筋束剖面。利用数字图像相关技术对剪切裂纹宽度和滑移进行了跟踪。结果表明，后张预应力混凝土梁破坏形式为剪压或剪拉，非预应力混凝土梁破坏形式为斜拉。后张梁的设计具有大致相同的纵向钢筋刚度，表现出类似的剪切强度。FRP筋的搭接使混凝土的抗剪开裂强度提高了8.8%，但对混凝土的最大抗剪强度影响不大。在这项研究中，它被证明，在FRP后张梁的抗剪承载力的作用，而骨料联锁的贡献可以忽略不计。
To investigate the shear behavior of post-tensioned concrete beams with longitudinal fiber-reinforced polymer (FRP) reinforcements and without stirrups, seven large-scale beams, with a shear span-to-effective depth ratio of approximately 3.0, were tested. The test variables included the prestressing level, type of flexural reinforcement, and tendon profile. The shear crack width and slip were tracked using digital image correlation technique. It was found that the post-tensioned concrete beams failed in shear-compression or shear-tension, while the nonprestressed concrete beam failed in diagonal tension. The post-tensioned beams designed to have approximately the same longitudinal reinforcement stiffness, exhibited similar shear strength. Draping FRP tendons resulted in an increase of 8.8% in shear cracking strength, while it had slight effect on the maximum shear strength. In this study, it was demonstrated that arching action played a major role in the shear resistance of FRP post-tensioned beams, while the contribution of aggregate interlock was negligible.