活性粉末混凝土(RPC)预应力叠合梁受弯性能研究  

Study on the Bending Performance of Reactive Powder Concrete Prestressed Composite Beams

作　　者：廖莎[1] 马远荣[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2005年第1期57-62,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50478052)

摘　　要：为研究活性粉末混凝土(RPC)材料的结构性能,设计了三根活性粉末混凝土无粘结预应力叠合梁,对其受弯性能进行了研究,得到了关于截面应变分布、钢绞线应力增量、中点挠度等有效的试验数据以及试验梁的裂缝分布和破坏特征.试验结果表明,RPC叠合梁的截面应变符合平截面假定;裂缝分布仍然具有明显的纯无粘结预应力梁的裂缝分布特征;荷载 挠度曲线为两直线段形状,且有效预应力越大,试验梁延性越差,破坏时挠度越小.荷载 预应力增量曲线形状与荷载 挠度曲线形状相似,呈两直线段.文中还建立了试验梁的开裂弯矩和刚度计算公式,理论计算结果与试验结果吻合良好.In order to find out the structural performance of reactive powder concrete, three unbonded prestressed composite beams were made. The bending performance of these beams was studied, and the data of the strain of section , the stress increment of the unbonded steel, and the deflection at the middle-span were obtained. The experimental results indicated that the strain distribution along the section height conformed to the hypothesis of plane section, and the crack distribution had the feature of unbonded prestressed beam without bars. The curves of load-deflection and load-stress increment were similar, and the larger the prestress, the worse the ductility and the smaller the deflection. The formula of cracking moment and stiffness were established, and calculation results agreed well with the experimental data.

关 键 词：活性粉末 混凝土 叠合梁 受弯性能 刚度 

分 类 号：TU387[建筑科学—结构工程]