圆钢套管-钢纤维水泥砂浆加固预损RC柱轴压性能研究  

Axial compression performance of pre-cracked RC columns strengthened by round steel casing and steel fiber cement mortar

作　　者：李哲[1] 冯学伟 吕鑫 邢乐阳 雷家奇 LI Zhe;FENG Xuewei;LÜXin;XING Leyang;LEI Jiaqi(School of Civil Engineering and Architecture,Xi'an University of Technology,710048 Xi'an,China)

机构地区：[1]西安理工大学土木建筑工程学院,西安710048

出　　处：《应用力学学报》2022年第2期336-341,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(No.51608441);陕西省自然科基金资助项目(No.2019JM-193)。

摘　　要：圆钢套管-钢纤维水泥砂浆外包加固RC柱是一种新型的加固技术。钢纤维水泥砂浆比普通混凝土砂浆在韧性、抗裂性和延性方面都有明显的提高,并且钢套管加固混凝土柱的强度和延性有很大程度的提高。以预加载普通钢筋混凝土柱峰值荷载的百分比作为柱子受损程度指标:加载极限荷载的60%为一级损伤、80%为二级损伤、100%为三级损伤。总共设计了7根试件,分别以钢套管径厚比、RC损伤程度、预损柱离散性作为影响因素进行轴心受压性能研究。在试验研究的基础上,建立了复合加固钢筋混凝土圆形截面短柱轴压承载力计算公式,计算结果与试验结果吻合良好。Round steel casing-steel fiber cement mortar outsourcing reinforcement RC column is a new type of reinforcement technology.Steel fiber cement mortar has a significant improvement in toughness,crack resistance and ductility over ordinary concrete mortar,and the strength and ductility of steel casing reinforced concrete columns has been improved to a large extent.At present,domestic and international research on this method mainly focuses on the performance of unpre-damaged components after reinforcement,while research on the reinforcement of components with different degrees of damage is still relatively lacking.In this paper,the percentage of the peak load of the pre-loaded ordinary reinforced concrete column is mainly used as the damage index of the column:60%of the ultimate load is primary damage,80%is secondary damage,and 100%is tertiary damage.A total of seven specimens were designed,and the axial compression test of the damaged columns strengthened with steel casing steel fiber cement mortar was carried out with steel casing diameter-thickness ratio,damage degree of RC,and dispersion of the pre-damaged columns as the influencing factors.Based on the experimental study,a formula for calculating the axial bearing capacity of reinforced concrete short circular cross-section columns reinforced by steel fiber cement mortar is established.

关 键 词：圆钢套管 钢纤维水泥砂浆 预损RC圆柱 复合加固 轴压性能 

分 类 号：TU398.9[建筑科学—结构工程]