土木建筑与环境工程
土木建築與環境工程
토목건축여배경공정
JOURNAL OF CIVIL, ARCHITECTURAL & ENVIRONMENTAL ENGINEERING
2014年
1期
33-37
,共5页
混杂纤维%高性能混凝土%深梁%正交试验%受剪承载力%计算方法
混雜纖維%高性能混凝土%深樑%正交試驗%受剪承載力%計算方法
혼잡섬유%고성능혼응토%심량%정교시험%수전승재력%계산방법
hybrid fiber%high performance concrete (HPC)%deep beam%orthogonal experiment%calculation method
采用正交试验法设计钢聚丙烯混杂纤维高性能混凝土（简称 H PC ）深梁试件，通过静力试验研究混杂纤维H PC深梁受剪承载力计算方法。正交试验中考虑的因素主要有钢纤维特征参数（类型、体积率、长径比）、聚丙烯纤维体积率、水平及竖向分布钢筋配筋率等。结果表明：混杂纤维能改变无腹筋H PC深梁的受剪破坏形态；混杂纤维的掺入使得 H PC深梁的剪切初裂强度和抗剪极限强度明显提高，其平均提高幅度分别为45．2％和25．6％。将塑性理论应用于混杂纤维 H PC深梁受剪承载力计算得到了很好的结果，分析表明水平及竖向分布钢筋配筋率的大小对混杂纤维H PC深梁抗剪强度的影响不显著，但水平分布钢筋的作用大于竖向分布钢筋。分析了混杂纤维的增强机理，提出了基于“拉杆拱”模型和劈裂破坏计算模式的混杂纤维 H PC深梁受剪承载力计算式。
採用正交試驗法設計鋼聚丙烯混雜纖維高性能混凝土（簡稱 H PC ）深樑試件，通過靜力試驗研究混雜纖維H PC深樑受剪承載力計算方法。正交試驗中攷慮的因素主要有鋼纖維特徵參數（類型、體積率、長徑比）、聚丙烯纖維體積率、水平及豎嚮分佈鋼觔配觔率等。結果錶明：混雜纖維能改變無腹觔H PC深樑的受剪破壞形態；混雜纖維的摻入使得 H PC深樑的剪切初裂彊度和抗剪極限彊度明顯提高，其平均提高幅度分彆為45．2％和25．6％。將塑性理論應用于混雜纖維 H PC深樑受剪承載力計算得到瞭很好的結果，分析錶明水平及豎嚮分佈鋼觔配觔率的大小對混雜纖維H PC深樑抗剪彊度的影響不顯著，但水平分佈鋼觔的作用大于豎嚮分佈鋼觔。分析瞭混雜纖維的增彊機理，提齣瞭基于“拉桿拱”模型和劈裂破壞計算模式的混雜纖維 H PC深樑受剪承載力計算式。
채용정교시험법설계강취병희혼잡섬유고성능혼응토（간칭 H PC ）심량시건，통과정력시험연구혼잡섬유H PC심량수전승재력계산방법。정교시험중고필적인소주요유강섬유특정삼수（류형、체적솔、장경비）、취병희섬유체적솔、수평급수향분포강근배근솔등。결과표명：혼잡섬유능개변무복근H PC심량적수전파배형태；혼잡섬유적참입사득 H PC심량적전절초렬강도화항전겁한강도명현제고，기평균제고폭도분별위45．2％화25．6％。장소성이론응용우혼잡섬유 H PC심량수전승재력계산득도료흔호적결과，분석표명수평급수향분포강근배근솔적대소대혼잡섬유H PC심량항전강도적영향불현저，단수평분포강근적작용대우수향분포강근。분석료혼잡섬유적증강궤리，제출료기우“랍간공”모형화벽렬파배계산모식적혼잡섬유 H PC심량수전승재력계산식。
T he static tests on hybrid fiber (steel fiber and polypropylene fiber ) reinforced high performance concrete deep beams according to the orthogonal experimental design were conducted .The shear capacity and calculation method of deep beams were discussed as well . The contributory factors such as the characteristic parameters of steel fiber (types , volume fraction , aspect ratio ) , the volume fraction of polypropylene fiber ,the ratio of web horizontal reinforcement and the ratio of web vertical reinforcement were analyzed .Results show that the shear failure mode of deep beams is changed with adding a reasonable volume of hybrid fibers ,and hybrid fiber can greatly increase the diagonal cracking strength and shear strength of HPC deep beams .The diagonal cracking strength is increased by 45 .2% averagely while the shear strength is increased by 25 .6% averagely .A satisfied result is obtained when the plasticity theory is used to analyze shear behavior of hybrid fiber reinforced HPC deep beams . The contribution of web horizontal reinforcement and web vertical reinforcement to shear strength of deep beams is not obvious but the former plays a major role .After analyzing the strengthening mechanism of hybrid fiber ,a formula to calculate the shear capacity of hybrid fiber reinforced HPC deep beams is presented based on spatial strut-and-tie mode and splitting failure .
