预应力超高性能钢纤维混凝土受力性能与承载力的计算方法  

The Performance and Calculation Methods of Bearing Capacity of Prestressed Ultra High Performance Steel Fiber Reinforced Concrete

作　　者：谢晓杰 李文霞 

机构地区：[1]郑州工业应用技术学院建筑工程学院,河南新郑451150

出　　处：《公路工程》2016年第5期239-243,共5页Highway Engineering

摘　　要：在对预应力超高性能钢纤维混凝土受力性能研究的试验中，以5个超高性钢纤维混凝土桩承台试件为基础进行受弯试验，对承台有效厚度、钢筋配筋率、钢纤维体积率、钢筋以及混凝土应变特征等进行分析。结果表明：底部配筋率为0．5％≤ρs≤1．25％的钢纤维高强混凝土桩承台呈现受弯破坏形态，在挠度为0-1．7mm区间内，配筋率为0．8％的荷载最大。在挠度为0—0．7mm区间内，体积率为I．0％的荷载最大，斜率更大，会增加承台的变形能力和承载力，在增加钢纤维体积率的同时增加其承载力。根据研究结果提出了预应力超高性能钢纤维混凝土桩承台抗剪承载力计算模型，进行计算预应力超高性能钢纤维混凝土桩承台抗剪承载力方式的构建。构建公式来计算预应力超高性能钢纤维混凝土承台抗剪承载力，同时，结合计算超高性能钢筋混凝土承台的共识，在工程设计过程中可以运用该公式。The experiments of 5 specimens of ultra high performance steel fiber concrete mechanical properties, which have the plane dimensions were conducted. The crack distribution load-deflection curve, concrete strain and longitudinal reinforcement strain of pile caps were measured. The factors, such as the steel fiber volume ratio, effective thickness, reinforcement ratio and reinforcement layout, and the concrete strength of the pile caps were analyzed. The results show that bottom reinforcement rate is 0. 5% ≤ρs ≤ 1.25% of steel fiber high strength concrete pile caps presented by bending failure mode, the deflection 0 - 1.7 mm interval and reinforcement rate is the maximum load of 0.8%. In the range of 0 - 0.7 mm, the maximum load is 1% , the slope is steeper, the bearing capacity and deformation capacity of the platform are greatly improved, and with the increase of the volume ratio of steel fiber. According to the results of the study, the calculation model of anti shear capacity of prestressed super high performance steel fiber reinforced concrete pile is proposed, and the calculation method of the shear capacity of prestressed super high performance steel fiber reinforced concrete pile is established. The formula for calculating the shear bearing capacity of prestressed ultra - high performance steel fiber reinforced concrete bearing platform is presented, which can be used in practical engineering design.

关 键 词：钢纤维混凝土 抗剪承载力 超高性能 计算模型 受力性能 预应力 钢筋混凝土承台 钢筋配筋率 

分 类 号：TU317.1[建筑科学—结构工程]