钢筋HPFRCC/混凝土复合梁受弯性能试验研究  

Influence factor on flexural behavior of reinforced HPFRCC/concrete composite beams

作　　者：李艳[1] 陈卫峰[1] 苗宽宽 潘燕秋[1] 

机构地区：[1]河南理工大学土木工程学院,河南焦作454003

出　　处：《混凝土》2018年第2期1-5,共5页Concrete

基　　金：国家自然科学基金资助项目(51208183);河南省科技攻关项目(132102310312);河南省高等学校青年骨干教师资助项目(2014GGJS-043);河南省高等学校重点科研项目(17A560005)

摘　　要：基于钢筋HPFRCC/混凝土复合梁的四点弯曲试验,主要研究了纵筋配筋率、HPFRCC层厚度和HPFRCC/混凝土强度对复合梁受弯性能影响,研究结果表明,受拉区的HPFRCC层能有效抑制裂缝的扩展,使复合梁中的裂缝变得更加细密;随着纵筋配筋率、HPFRCC层厚度和HPFRCC/混凝土强度的提高,复合梁的各特征荷载均有所提高,且受拉纵筋与压区混凝土的应变值也减小,其中,HPFRCC/混凝土强度对复合梁的影响最不明显,且当HPFRCC层厚度超过40 mm后,厚度的增加对复合梁的影响不再明显。Based on the four-point bending test of high performance fiber reinforced cement composite （HPFRCC）/concrete composite beam,it mainly studied the effect of longitudinal reinforcement ratio, the thickness of HPFRCC and the strength of HPFRCC/concrete on flexural performance of composite beam.The results show that the HPFRCC layer in the tensile zone can restrain the cracks propagation effectively and make the cracks of the composite beam become more closely.With the increase of longitudinal reinforcement ratio,the thickness of HPFRCC and the strength of HPFRCC/concrete, the characteristic loads of composite beam are all increased and the strains of tension reinforcement and compression concrete are decreased.The effect of HPFRCC/concrete strength on composite beam is not obvious. When the thickness of HPFRCC layer is more than 40mm, the influence of thickness on composite beams is no longer obvious.

关 键 词：高性能纤维增强水泥基复合材料 复合梁 受弯性能 裂缝 特征荷载 

分 类 号：TU528.01[建筑科学—建筑技术科学]