预应力超高强混凝土简支梁抗弯性能分析  

Study on flexural behavior of prestressed ultra-high strength concrete beams

作　　者：孟刚[1] 贾金青[1] 王吉忠[1] 

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

出　　处：《哈尔滨工程大学学报》2013年第5期575-580,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(51078059)

摘　　要：为探讨预应力超高强混凝土梁的抗弯性能,进行了4根后张法有粘结预应力超高强混凝土简支梁在竖向静力荷载作用下的受力性能试验,分析了试件受力过程、破坏形态、短期最大裂缝宽度以及跨中挠度等相关试验数据.结果表明:预应力超高强混凝土梁受弯破坏形态和挠曲模式与预应力混凝土梁基本相同;试验梁跨中控制截面基本符合平截面假定,极限承载力按照规范正截面抗弯理论计算可行.通过分析试验数据,在现行规范的基础上修正了裂缝宽度及挠度计算公式.研究结果可为超高强混凝土梁的设计以及相关规范的修订提供理论依据.Four post-tensioned bonded prestressed ultra-high strength concrete beams that were simply supported have been tested under vertical static load to investigate the flexural performance of the prestressed ultra-high strength concrete beams. The performances such as failure pattern, failure mechanism, short-term maximum crack width and span deflection of test specimen were examined. The test results indicate that the failure pattern and load- displacement curve mode of pre-stressed ultra-high strength concrete beams were basically the same as prestressed concrete beams; the control section of the tested beam span were basically in accordance with the plane section as- sumption; thus, calculating the ultimate bearing capacity was feasible with the norms of ultimate flexural theory. The authors fixed the maximum crack width and deflection formula on the basis of existing norms by examining test data. The present research provides a theoretical basis for the design of ultra-high strength concrete beams and revi- sion correlative specifications.

关 键 词：超高强混凝土 抗弯性能 承载力 裂缝宽度 挠度 

分 类 号：TU378.2[建筑科学—结构工程]