钢纤维混凝土六桩双柱厚承台试验研究及理论分析  

Experimental study and theoretic analysis of steel fiber reinforced concrete six-pile thick caps with double-column

作　　者：李继祥[1,2] 张元元[3] 刘肖凡[1] 

机构地区：[1]武汉工业学院土木工程与建筑学院,湖北武汉430023 [2]中国地质大学工程学院,湖北武汉430074 [3]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《建筑结构学报》2009年第2期149-157,共9页Journal of Building Structures

基　　金：湖北省自然科学基金项目(2004ABA030);武汉市科技攻关计划项目(200810321150)

摘　　要：为了研究钢纤维混凝土六桩双柱厚承台受力模型和传力机理,对6个试件进行静力加载试验和非线性有限元分析,探讨了钢纤维混凝土六桩双柱厚承台开裂荷载、极限荷载、裂缝开展、承台内部应变分布、钢筋应力分布等力学性能。结果表明:钢纤维的掺入能有效提高混凝土承台的开裂荷载和极限荷载,延缓承台的开裂,阻裂效果明显;钢纤维混凝土双柱六桩厚承台破坏形态为冲切破坏,其传力模型符合空间拉压杆模型。提出了基于拉压杆模型的承载力设计计算公式,其计算值与试验值吻合较好;最后给出基于拉压杆模型的双柱承台的设计建议,便于实际工程中应用。In order to study the mechanics model and load-transferring pattern, 6 specimens were tested by static loading and analyzed by nonlinear finite element method. The mechanical behavior such as cracking load, limit load, distribution of strain inside caps and stress of the bars for steel fiber reinforced concrete （SFRC） double-column combined with six-pile caps （DCPC） are discussed. The results indicate that steel fiber could increase the cracking load and limit load for reinforced concrete caps, as the cracking and further growth cracks. The failure mode of SFRC double-column combined with six-pile caps as punching damage and the load-transfer can be explained by spatial strut- and-tie method （STM）. A bearing force formula based on the failure of the STM is presented, and the calculation results agrees with the experiments very well. Finally, some suggestions of DCPC design based on STM are given for the application of the STM in practice.

关 键 词：钢纤维混凝土 六桩双柱厚承台 静力试验 拉压杆模型 承载力 

分 类 号：TU473.1[建筑科学—结构工程] TU317.1[建筑科学—土工工程]