摘要
目前国内外尚未提出纤维增强树脂复合材料(FRP)筋超高性能混凝土(UHPC)梁受弯承载力的显式计算公式。基于ABAQUS中的塑性损伤模型,建立了FRP筋UHPC梁的受弯性能非线性有限元分析模型,通过已有试验结果验证了该模型的有效性。开展了40根UHPC梁的参数分析,重点研究了截面尺寸、UHPC强度、FRP筋抗拉强度和配筋率等因素对梁受弯性能的影响规律。基于目前国际上最常用的法国NF P 18-710规范,对UHPC受拉本构模型进行了简化,推导了UHPC受压区和受拉区等效矩形应力图块系数,提出了FRP筋UHPC梁平衡配筋率的计算方法,建立了受压破坏和受拉破坏模式下梁截面受弯承载力的理论计算公式。该公式计算值与试验结果、有限元分析结果和条带法计算结果均吻合良好。
Till now,no closed-form theoretical equation of flexural capacity of ultra-high performance concrete(UHPC)beams reinforced with fiber reinforced polymer(FRP)rebars has been proposed worldwide.Based on the concrete damage plasticity model in ABAQUS,a nonlinear finite element analysis model was developed to simulate the flexural performance of UHPC beams reinforced with FRP rebars.The model was verified with available test results.A parametric analysis of 40 UHPC beams was performed and the influence of parameters including cross section dimension,strength of UHPC,tensile strength of FRP rebars and reinforcement ratio on flexural performance were studied.Based on the most widely used standard worldwide French NF P 18-710,the constitutive model of UHPC was simplified and the parameters for equivalent rectangular stress block in compression zone and tension zone were deducted,then the calculation method of balanced reinforcement ratio and the theoretical equations for flexural capacity under compression failure and tension failure were developed for UHPC beams reinforced with FRP rebars.The calculated results from the theoretical equations are in a good agreement with results from tests,finite element analysis and strip method.
作者
薛文远
胡翔
薛伟辰
XUE Wenyuan;HU Xiang;XUE Weichen(Department of Structural Engineering,Tongji University,Shanghai 200092,China;Civil and Environmental Engineering Department,Stanford University,Calilfornia 94305,United States)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2022年第11期5109-5121,共13页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51878478,52130806)
宁波市科技创新2025重大专项(2020Z034)。
关键词
FRP筋
超高性能混凝土
梁受弯性能
有限元分析
破坏模式
平衡配筋率
受弯承载力计算
FRP rebar
ultra-high-performance concrete
beam flexural behavior
finite element analysis
failure mode
balanced reinforcement ratio
flexural capacity calculation
