Crack Resistance of the Normal Section in Lightweight UHPC Ribbed Panels
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摘要: 为研究超高性能混凝土(UHPC)轻型肋板的抗裂性能,设计了4个UHPC带肋板模型并进行加载试验,分析了试件的裂缝开展规律与破坏模式。在此基础采用有限元软件对试验进行模拟,分析了配筋率、纵向受拉钢筋屈服强度、肋板尺寸、UHPC抗压强度与UHPC抗拉强度对开裂弯矩的影响。结合现有规范,推导了轻型UHPC肋板的开裂弯矩计算方法。结果表明:开裂荷载受配筋率、肋高尺寸、肋宽尺寸、UHPC抗拉强度的影响较大,其中肋高尺寸的增加对开裂荷载的提升率最高,配筋率次之,而UHPC抗压强度和钢筋屈服强度对抗裂性能几乎没有影响。基于平截面假定,得到轻型UHPC肋板的开裂弯矩,其计算值与试验实测值、有限元计算值吻合度较好,可靠性较高。Abstract: In order to study the crack resistance of lightweight ultra-high perfor mance concrete(UHPC) ribbed panels, four UHPC ribbed panel models were designed and subjected to loading tests. The crack development patterns and failure modes of the specimens were analyzed. On this basis, finite element software was used to simulate the tests, and the effects of reinforcement ratio, yield strength of longitudinal tensile reinforcement, rib dimensions, UHPC compressive strength, and UHPC tensile strength on the cracking moment were analyzed. Combined with existing specifications, a calculation method for the cracking moment of lightweight UHPC ribbed panels was derived. The results showed that the cracking load was significantly affected by the reinforcement ratio, rib height, rib width, and UHPC tensile strength. A mong these factors, increasing the rib height had the greatest effect on improving the cracking load, followed by the reinforcement ratio, whereas the UHPC compressive strength and the yield strength of the reinforcement had almost no effect on the crack resistance. Based on the plane section assumption, the cracking moment of the lightweight UHPC ribbed panels was determined. The calculated values agreed well with the experimental measurements and finite element simulations, demonstrating high reliability, which can provide a reference for design and engineering applications.
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[1] 邵旭东,樊伟,黄政宇.超高性能混凝土在结构中的应用[J].土木工程学报,2021,54(1):1-13. [2] 马熙伦,杨简,陈宝春,等.截面形式对R-UHPC梁抗弯承载力的影响[J].福州大学学报(自然科学版),2021,49(1):80-86. [3] 苏家战,傅元方,黄卿维,等.钢筋超高性能混凝土梁受弯试验和有限元分析研究[J].中外公路,2017,37(6):99-105. [4] 高辰.30 m预应力UHPC-T形梁设计及抗弯性能研究[D].长沙:长沙理工大学,2019. [5] 舒阳.粗骨料UHPC梁斜截面抗剪性能试验研究[J].四川建筑科学研究,2020,40(4):302-305. [6] 徐海宾,邓宗才.UHPC梁开裂剪力和斜裂缝宽度计算[J].四川建筑科学研究,2017,43(4):12-15. [7] 晏凯.HRB500钢筋LC40高性能钢纤维全轻混凝土T形梁受弯性能试验研究[D].郑州:华北水利水电大学,2019. [8] 费腾.HRB400钢筋CF30钢纤维全轻混凝土T形梁受弯性能试验研究[D].郑州:华北水利水电大学,2019. [9] 王成志.超高性能混凝土结构抗弯性能试验研究[D].成都:西南交通大学,2017. [10] QIU M,SHAO X,WILLE K,et al.Experimental investigation on flexural behavior of reinforced ultra-high performance concrete low-profile T-beams[J].International Journal of Concrete Structures and Materials,2020,14(1):1-20. [11] 曹霞,常婧,王艳俊.高强钢筋RPC梁受弯构件正截面承载力试验研究[J].河南理工大学学报(自然科学版),2015,34(1):109-115. [12] 何金春,罗立权,刘健.钢筋混凝土T形梁优化设计研究[J].建筑技术开发,2019,46(13):5-6. [13] 胡磊,宁怀明.预应力CFRP加固混凝土T型梁抗弯性能分析[J].混凝土,2011(6):33-34. [14] 李立峰,齐瑞,石雄伟,等.UHPC-T形梁斜截面抗裂性能试验[J].中国公路学报,2023,36(4):100-111. [15] 马啸.UHPC肋板结构力学性能研究[D].北京:北京交通大学,2018. [16] 刘述虹.典型综合管廊体系地震响应分析[D].哈尔滨:中国地震局工程力学研究所,2016. [17] American Concrete Institute.Design considerations for steel reinforced concrete:441.R1-98[S].Farmington Hills:American Concrete Institute,1998:1-18. -
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