钢筋增强超高韧性水泥基复合材料梁的弯曲承载力及延性分析  

ANALYSIS ON FLEXURAL CAPACITY AND DUCTILITY OF STEEL REINFORCED ULTRAHIGH TOUGHNESS CEMENTITIOUS COMPOSITE BEAMS

作　　者：张秀芳[1] 徐世烺[1] 

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024

出　　处：《工程力学》2009年第12期133-141,149,共10页Engineering Mechanics

基　　金：国家自然科学基金重点项目(50438010);南水北调工程建设重大关键技术研究及应用项目(JGZXJJ2006-13)

摘　　要：采用国内新近研究的具有应变硬化特征的超高韧性水泥基复合材料(UHTCC)代替普通混凝土材料,进行了4组不同配筋率共12个钢筋增强超高韧性水泥基复合材料(RUHTCC)梁的弯曲试验,根据梁理论计算了RUHTCC受弯梁在起裂、屈服以及极限破坏时对应的弯曲承载力,并以跨中挠度、曲率及能量为表征参数计算了构件的延性。与试验结果的比较表明:理论与试验结果吻合较好;RUHTCC梁可提高普通钢筋混凝土梁的承载力和延性,减少钢筋用量。因此,在箍筋配置过密或对结构延性要求较高的结构关键部位如预应力锚索区和梁柱节点等,UHTCC有着更为广泛的推广应用前景。Ultrahigh toughness cementitious composites material with strain-hardening characteristic （UHTCC） was recently developed in China. In this paper, 12 steel reinforce UHTCC （RUHTCC） beams with different reinforcement ratios are categorized into 4 groups and tested under four-point bending loading. The flexural load-carrying capacity at initial cracking, yielding and ultimate failure is calculated based on beam theory and the ductility of RUHTCC beams is calculated in terms of middle-span displacement, curvature and energy, respectively. A comparison between the theoretical and experimental results demonstrates well agreement, and it is found that RUHTCC beam can enhance the ultimate flexural capacity and ductility of ordinary reinforced concrete beam and save the amount of steel reinforcement. These observations suggest that UHTCC is a promising alternative material to conventional plain concrete material for some parts where either heavily reinforced stirrups are in need or high ductility is desired, i.e, anchorage zone in pre-stressed structures and beam-column joint.

关 键 词：水泥基复合材料 四点弯曲试验 RUHTCC梁弯曲承载力 延性 钢筋混凝土梁 

分 类 号：TU375.1[建筑科学—结构工程] TU528.572