型钢-钢纤维高强混凝土柱抗震性能试验研究  

Experimental Study on Seismic Behavior of Steel Reinforced High-strength Concrete Column with Steel Fiber

作　　者：张海坤 高志杰 孔炯 丁伟 陶清林[1] ZHANG Haikun;GAO Zhijie;KONG Jiong;DING Wei;TAO Qinglin(School of Civil Engineering,Anhui University of Technology,Maanshan 243032,China;Technology Center,China MCC 17 Group Co.,Ltd,Maanshan 243000,China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243032 [2]中国十七冶集团有限公司技术中心,安徽马鞍山243000

出　　处：《安徽工业大学学报（自然科学版）》2023年第2期205-212,共8页Journal of Anhui University of Technology（Natural Science）

基　　金：安徽省高校重点科研项目(2022AH050342);国家自然科学基金项目(51408003)。

摘　　要：为改善高强混凝土的脆性,提升型钢高强混凝土柱的抗震性能,采用钢纤维混凝土制备型钢高强混凝土柱试件,开展型钢-钢纤维高强混凝土柱的低周往复加载试验,观察试件的破坏过程和形态,基于荷载-位移滞回曲线、骨架曲线及强度衰减分析钢纤维掺量对试件变形能力、承载力、延性等抗震性能的影响。结果表明:钢纤维体积分数在0~2.0%范围内,不同钢纤维掺量的试件均发生弯曲破坏,但钢纤维的掺入可延缓裂缝发展,有效防止混凝土大面积脱落;加入钢纤维,试件的滞回曲线更饱满,耗能能力显著提升,承载力提高了13%~21%,钢纤维体积分数为1.0%时提高最明显;随钢纤维掺量的增加,试件的延性和变形能力得到改善,钢纤维体积分数为2.0%时延性系数达5.34,强度衰减缓慢,控制位移增大,在变形较大的情况下,试件的强度衰减从28%降为16%。钢纤维的增韧效果能显著提升型钢混凝土组合结构的抗震性能。In order to improve the brittleness of high-strength concrete and promote the seismic performance of steel reinforced high-strength concrete columns,steel fiber was used to prepare reinforced high-strength concrete column specimens,and low cycle cyclic loading tests were carried out to observe the failure process and shape of the specimens.Based on load-displacement hysteresis curve,skeleton curve and strength attenuation,the influence of steel fiber content on the seismic performance of the specimen was studied.The results show that when the volume fraction of steel fiber is in the range of 0−2.0%,the specimens with different content of steel fiber undergo bending failure,but the addition of steel fiber can delay the crack development and effectively prevent the concrete from falling off in a large area.After adding steel fiber,the hysteretic curve is fuller,and the energy dissipation capacity is significantly improved,the bearing capacity is increased by 13%−21%,and the increase is most obvious when the volume fraction of steel fiber is 1.0%.With the increase of steel fiber content,the deformation ability and ductility of the specimen are improved,and the ductility coefficient of the specimen reaches 5.34 when the volume fraction of steel fiber content is 2.0%.The intensity attenuation is slow,and the control displacement increases with the addition of steel fiber.In the case of large deformation,the intensity attenuation of the specimen decreases from 28%to 16%in condition of large deformation.The toughening effect of steel fiber can significantly improve the seismic performance of steel reinforced concrete composite structures.

关 键 词：高强混凝土柱 钢纤维 抗震性能 滞回耗能 延性 

分 类 号：TU398.9[建筑科学—结构工程]