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  

Experimental study on seismic behavior of FR-RAC beam-column joints

作　　者：杜园芳[1] 王社良[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《建筑结构学报》2016年第4期40-46,共7页Journal of Building Structures

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)

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。Aiming at the shortcomings of ordinary concrete,the composite reinforced material was used to improve the seismic performance of the recycled concrete joint. The material is mainly composed of recycled hybrid fiber and silica powder. The low-cyclic reversed loading tests were carried out for three interior beam-column joints made by the composite fiber reinforced recycled aggregate concrete（ FR-RAC）. The failure pattern,bearing mechanism and capacity were studied. The test results show that： by adding a performance enhancing materials,FR-RAC joints can overcome the RAC joint deficiency that the stress and damage concentrate along the new and old recycled aggregate mortar interface and presents a loose form damage. Under the same condition,the FR-RAC joints crack can be delayed,the bearing capacity is improved, the deformation capacity is enhanced and the beam longitudinal reinforcement bond slip is effectively restrained. Compared with the ordinary RAC joint,the ductility coefficient of FR-RAC joint is increased by 18. 91%. The strain of longitudinal reinforcement and stirrup at joints reach 2. 0 × 10^（-3）and 2. 5 × 10^（-3）. This indicates that the concrete and the steel bar have better working performance after the addition of hybrid fiber.

关 键 词：再生混凝土 框架中节点 复合增强 拟静力试验 承载力 

分 类 号：TU375.4[建筑科学—结构工程] TU317.1