纤维增强复材筋增强工程用水泥基复合材料-混凝土复合梁受弯性能试验研究

发布时间：2018-05-06 03:30

本文选题：FRP + ECC　；参考：《工业建筑》2017年11期

【摘要】：为解决纤维增强复材(FRP)筋混凝土梁裂缝宽度和变形均较大的问题,采用受拉性能优良的工程用水泥基复合材料(ECC)取代FRP筋周围受拉混凝土形成FRP筋ECC-混凝土复合梁。通过对2组FRP筋ECC-混凝土复合梁、1组钢筋ECC-混凝土复合梁(每组5种不同ECC替代高度)的受弯试验,分析试件的开裂、屈服、极限荷载以及各级荷载下试件的挠度、裂缝、纵筋应变、混凝土平均应变。研究表明:钢筋/FRP筋与混凝土/ECC有较好的协同变形能力,ECC与混凝土也有较好的黏结性能;复合梁截面的平均应变均符合平截面假定;复合梁在正常使用状态下,受拉区ECC能充分发挥其应变硬化特性,形成较多细而密的裂缝;FRP筋ECC-混凝土复合梁可有效控制梁的变形值,提高梁的抗弯承载能力。
[Abstract]:In order to solve the problem of large crack width and deformation of reinforced concrete beams reinforced with fiber reinforced composite beams (FRP) beams, ECC-RC beams with FRP tendons were formed by replacing the tensile concrete around FRP tendons with cement matrix composites with good tensile properties. Based on the flexural tests of two groups of reinforced ECC-concrete composite beams with FRP bars (5 different ECC substitution heights for each group), the cracking, yield, ultimate load, deflection and crack of the specimens under various loads are analyzed. Longitudinal strain, average strain of concrete. The results show that the RC / FRP bars and concrete / ECC have good synergistic deformation capacity and the average strain of the composite beams conforms to the assumption of the plane section, and the composite beams are in normal service, and the average strain of the composite beams is in accordance with the assumption of the plane section. In tensile zone, ECC can give full play to its strain-hardening characteristics and form a number of fine and dense cracks. ECC-concrete composite beams can effectively control the deformation value of the beams and improve the flexural bearing capacity of the beams.
【作者单位】：扬州大学建筑科学与工程学院;
【基金】：国家自然科学基金资助项目(51678514,51308490) 江苏省自然科学基金(BK20130450) 江苏省六大人才高峰项目(JZ-038,2016) 2014江苏省政府留学奖学金项目江苏省研究生实践创新计划项目(SJCX17-0625)
【分类号】：TU37

【相似文献】