钢纤维混凝土厚承台承载力影响因素分析

The Experimental Research on Affecting Factors on Bearing Capacity of Steel Fiber Reinforced Concrete Thick Cap With Two Piles

在完成 3 0个缩尺模型为 1∶5的二桩混凝土和钢纤维混凝土承台试件的试验研究中 ,通过改变混凝土强度、钢纤维体积率、承台有效厚度、配筋量及配筋方式 ,观察和记录了不同条件下桩承台裂缝的开展与分布 ,承台底部中点挠度、侧边混凝土应变和底部受拉钢筋应变 ,并系统地分析了影响钢纤维混凝土二桩厚承台极限承载力的主要因素。分析结果为进一步研究钢纤维混凝土二桩承台的抗冲切、抗剪及配筋计算提供了试验基础 ,并为《钢纤维混凝土结构技术规程》

An experimental research is carried out on thirty specimens of steel reinforced concrete and steel fiber reinforced concrete (SFRC) two-pile thick cap of 1∶5 model ratio with different concrete strength, volume ratio of steel fiber, effective thickness of cap, reinforcement steel ratio and method. On the basis of experimental records, such parameters as the crack distribution and extending, the deformation at the mid-point on the bottom of specimens and the strain of concrete and tension bearing steel bar, the main factors which affect the ultimate bearing capacity of SFRC two-pile thick cap are analyzed systematically in this paper, which provide reliable data for further research on punch strength, shear strength and calculation on steel of SFRC cap with twopile. Meanwhile an available and reasonable reference is provided for revising the norm.