摘要
在高强混凝土结构中,配置高强箍筋可以有效地提高构件的承载力和变形性能。通过6根小剪跨比的高强箍筋高强混凝土简支梁的抗剪性能试验,研究了该类构件的破坏过程、破坏形态,分析了箍筋间距、箍筋强度以及平均约束应力等对其受剪承载力的影响。同时,结合国内外大量试验数据,将试验值与采用我国《混凝土结构设计规范》(GB 50010—2002)及日本高强箍筋钢筋混凝土设计指南中的计算值进行了对比。结果表明:高强箍筋和高强混凝土组合更加合理;当平均约束应力小于4时,高强箍筋高强混凝土梁受剪承载力可按我国现行规范公式计算;当平均约束应力大于4时,我国规范计算值偏于不安全,而日本设计指南公式计算值安全储备高,但过于保守;当混凝土等级较低时,配置高强箍筋的混凝土梁按我国现行规范公式计算安全度较低。
High-strength stirrups can be used in high-strength concrete members to improve the capacity and deformation performance of the member.Based on experiments of 6 reinforced concrete beams with high-strength stirrups,which were simply supported and had small shear span-to-depth ratio,the failure mechanism of the beams were studied,and the influences of the stirrup spacing,the yield strength of stirrup and the average restraining stress on the shear capacity were analyzed.Other researcher's test data of concrete beams with high-strength stirrups were also incorporated,and the experimental results were compared with the calculation values in Chinese Code and Japanese Code for the design of concrete structures.It is shown that: when the average restraining stress is less than 4,the shear capacity of concrete beams with high-strength stirrups can be estimated using current Chinese Code;when the average restraining stress is greater than or equal to 4,the current Chinese Code will overestimate the shear capacity,and the Japanese Code is conservative;the safety level of the shear design approach in Chinese Code is low for the design of normal strength concrete beams with high-strength stirrups.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2009年第S2期98-103,共6页
Journal of Building Structures
基金
国家自然科学基金项目(50978215)
关键词
高强箍筋
高强混凝土
平均约束应力
静力试验
受剪承载力
high-strength stirrups
high-strength concrete
average restraining stress
static test
shear capacity
