纵筋率对高强钢筋RPC简支梁受剪性能的影响  

Influence of longitudinal reinforcement ratio on shear resistance of high strength reinforced RPC beams

作　　者：曹霞[1] 唐婷[1] 彭金成[1] 金凌志[1] 

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《广西大学学报（自然科学版）》2015年第4期831-837,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51368013);广西岩土力学与工程重点实验室项目(11-CX-04)

摘　　要：为了研究纵筋率对高强钢筋活性粉末混凝土梁的斜向开裂荷载、斜裂缝宽度及抗剪承载力的影响,通过对3根纵筋率不同的高强钢筋活性粉末混凝土梁抗剪试验,分析梁在集中荷载作用下的破坏形态,研究纵筋率对斜向开裂荷载、斜裂缝宽度及抗剪承载力的影响。运用桁架—拱模型公式对试验数据进行了分析,并将试验值与《混凝土结构设计规范》(GB50010-2010)公式计算值进行比对研究。结果表明:试验梁的抗剪承载力与纵筋率之间呈现一定的线性关系,随着纵筋率的提高而提高,纵筋率由4.43%提高到6.39%和8.04%时,极限荷载提高了18.6%和19.3%;纵筋率对开裂荷载的影响较小,纵筋处裂缝宽度明显减小;按现行规范公式计算的高强钢筋活性粉末混凝土(RPC)梁抗剪承载力与试验实测值存在较大差异。In order to study the effect of longitudinal reinforcement ratio on the diagonal cracking load, diagonal crack width and shear capacity of high strength reinforced Reactive Powder Concrete （ RPC） beams, a shear test was carried out on three simply supported beams of different longitudinal reinforcement ratios, and the failure patterns of the beams under concentrated load were analyzed. The formula of truss arch model was used to analyze the test data, and the test values were compared with the calculated values given by the formula of Code for Design of Concrete Structures （ GB50010-2010 ） . The results show that the shear capacity of the test beams has a certain linear relationship with the longitudinal reinforcement ratio, and it increases with the increase of the longitudinal rein-forcement ratio. When the longitudinal reinforcement ratio is increased from 4. 43% to 6. 39% and 8. 04%, the ultimate load is increased by 18. 6% and 19. 3%, respectively. The influence of longitu-dinal reinforcement ratio on the cracking load is small, and the crack width decreased obviously near the longitudinal reinforcement. There is a large difference between the calculated value of shear ca-pacity which is obtained according to the formula of current specification and the experimental value.

关 键 词：高强钢筋 活性粉末混凝土 纵筋率 抗剪承载力 

分 类 号：TU375.1[建筑科学—结构工程]