纤维复合增强再生混凝土框架节点抗震承载性能试验研究

发布时间：2018-10-24 21:30

【摘要】：针对普通再生混凝土性能普遍较差的问题,将再生混杂纤维与硅粉组成的纤维复合增强材料掺入再生混凝土,达到提高再生混凝土框架节点抗震承载能力的作用。通过3个纤维复合增强再生混凝土框架梁柱中节点试件的低周反复加载试验,对其破坏形态、承载机理及承载能力等进行了研究。结果表明:通过添加纤维复合增强材料,克服了再生混凝土节点受力和破坏多沿再生骨料新老砂浆界面呈酥松状破坏,即脆性破坏的弊端。在与普通再生混凝土节点配筋相同的条件下,纤维复合增强再生混凝土框架节点开裂较晚,节点裂缝开展延缓,有效抑制梁端纵筋黏结滑移,承载力提高,变形能力增强,纤维复合增强再生混凝土框架节点较普通再生混凝土框架节点的转角延性系数提高18.91%。节点区纵筋和箍筋应变分别达到2.0×10-3及2.5×10-3,表明添加纤维复合增强材料后混凝土与钢筋具有更好的协同工作性能。
[Abstract]:Aiming at the problem of poor performance of ordinary recycled concrete, the composite fiber reinforced material composed of recycled hybrid fiber and silica fume is mixed into recycled concrete to improve the seismic bearing capacity of recycled concrete frame joint. The failure mode, bearing mechanism and bearing capacity of three specimens of recycled concrete frame Liang Zhu under low cycle loading were studied. The results show that by adding fiber composite reinforced material, the defects of joint stress and damage along the interface of recycled aggregate, new and old mortar, which is brittle failure, are overcome. Under the same condition as the common recycled concrete joints, the fiber reinforced recycled concrete frame joints crack later, the joint crack development is delayed, effectively restrain the slippage of longitudinal tendons at the end of the beam, improve the bearing capacity, and enhance the deformation ability. The angle ductility coefficient of fiber composite reinforced recycled concrete frame joints is 18.91 higher than that of ordinary recycled concrete frame joints. The strain of longitudinal reinforcement and stirrups are 2.0 脳 10 ~ (-3) and 2.5 脳 10 ~ (-3), respectively, which indicates that concrete and reinforcement have better synergistic working performance after adding fiber reinforced material.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金重大研究计划(90715003);国家自然科学基金项目(51178388)
【分类号】：TU377.9;TU352.11

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