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Bond Performance of Structural Members of High Strength Lightweight Concrete Reinforced by Frp Rods

玻璃钢棒增强高强轻质混凝土结构构件的粘结性能

基本信息

批准号：
01460189
负责人：
SONOBE Yasuhisa
金额：
$ 3.2万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

1. ObjectiveObjective of this study is emphasized on bond performance between continuous FRP rods, which are substitute reinforcement for steel bars, and concrete. Used materials were high-strength light-weight concrete of specified compressive strength of 360kgf/cm^2 and carbon, aramid and glass continuous fiber rods. To make a comparison with ordinary RC, normal concrete and steel bars for longitudinal reinforcement were also used.2. ExperimentsTotal of cantilever type specimens was 43, i. e., 29 of light-weight concrete and 14 of normal one. Their size was 20cm wide and 35cm deep. Bond splitting test was carried out by pulling independently out their top and bottom longitudinal reinforcement of diameter of about 13mm with bonding length of 30cm. Test results were referred to those derived from test of 6 beam type specimens, which failed in bond splitting, under cyclic and antisymmetric loading.3. ConclusionEmpirical formulae, in which bond splitting strength was expresed as the sum of those due to concrete and lateral reinforcement, were established by recurrent analysis, by which relationships of top to bottom reinforcement were also determined. Other leading results were as follows. Strengths due to concrete had hardly relation to its kind. In case of steel longitudinal reinforcement strengths due to fiber lateral reinforcement could be evaluated by multiplying values of steel case by ratios of Young's modulus of it to steel to the third power. In case of fiber reinforcement only, strengths due to concrete varied with shape and stiffness of longitudinal reinforcement and generally speaking, the lower stiffness was, the lower strength was. As to effect of lateral reinforcement ratios of contribution of corner longitudinal bars to middle ones were about 2 : 1.6, while they were 2 : 1 in case of steel longnal bars. Ultimate strength of beam specimens could be predicted from analysis of results of cantilever test.

1.目的本研究的目的是研究代替钢筋的连续FRP筋与混凝土之间的粘结性能。所用材料为规定抗压强度为360kgf/cm2的高强轻质混凝土，以及碳纤维、芳纶和玻璃纤维连续棒。为了与普通钢筋混凝土进行对比，还采用普通混凝土和钢筋进行纵向配筋。悬臂式试件共43个，其中轻骨料混凝土29个，普通混凝土14个。它们的大小是20厘米宽，35厘米深。粘结劈裂试验是通过独立拔出直径约13 mm、粘结长度为30 cm的上下纵向钢筋进行的。试验结果参考了6个梁式试件的试验结果，这些试件在循环荷载和反对称荷载作用下的粘结劈裂失败。结论通过回归分析，建立了混凝土与侧向配筋的粘结劈裂强度之和的经验公式，并由此确定了顶底配筋的关系。其他领先成果如下。混凝土的强度与其种类几乎没有关系。对于钢纵筋，由纤维横向加固引起的强度可以用钢壳的值乘以钢与钢的杨氏模量值的三次方来评估。在纤维加固的情况下，混凝土的强度随纵向钢筋的形状和刚度的不同而不同，一般来说，刚度越低，强度越低。对于侧向配筋的影响，角部纵筋与中部纵筋的贡献比约为2：1.6，而对于钢筋纵筋的贡献约为2：1。通过对悬臂试验结果的分析，可以预测梁试件的极限强度。