偏心荷载作用下FRP约束钢筋混凝土短柱的特性研究  

A STUDY ON THE PROPERTIES OF A FRP-CONFINED SHORT REINFORCED CONCRETE COLUMN SUBJECTED TO ECCENTRIC LOADING

作　　者：潘景龙[1] 王威[1] 金熙男[1] 王陈远[1] 

机构地区：[1]哈尔滨工业大学土木工程学院

出　　处：《土木工程学报》2005年第2期46-50,共5页China Civil Engineering Journal

摘　　要：作者根据 13个FRP约束钢筋混凝土偏压短柱的试验 ,证实当约束比 ξj 较大时 ,短柱表现出良好的延性破坏特征 ,其抗力与同规格普通钢筋混凝土柱相比 ,亦有不同程度的提高 ,但随初始偏心矩的增大而提高幅度降低。文章着重讨论了偏压短柱的Nu-Mu 相关曲线 ,指出由于FRP对混凝土的约束作用 ,极大地改善了混凝土的极限压应变εcu c,导致二阶矩效应和相对界限受压区高度的增大 ,致使短柱Nu-Mu 相关曲线上的任一点不再仅取决于初始偏心距 ,尚与构件长细比有关 ;相关曲线的界限点 (平衡点 )与Mu 峰值点不再重合 。Based on the test results of 13 FRP-confined short concrete columns under eccentric loadings, the columns with a higher confinement ratio ξ j demonstrated sood ductile-property at failure, and their bearing capacities were variably increased when compared with the same sized RC columns.The increase of bearing capacity was amplified with the reduction of the initial-eccentricity. The paper focuses on the discussion of bending moment-axial load interaction curve of the eccentrically loaded columns. It has been pointed out that the ultimate compressive strain of the FRP-constrained concrete may be greatly improved than that of RC column,and therefore, leading to the increase of the second-order moment effect and the depth of the relative limit compressive zone. Any point on the correlation curve is dependent not only on the initial-eccentricity, but also on the length-diameter ratio. The peak moment point on the interaction curve no longer overlaps the limit point of the correlation curve,and the length of the compressive failure zone on the correlation curve is shortened.

关 键 词：纤维增强塑料 约束混凝土 偏心受压短柱 相关曲线 

分 类 号：TU377.4[建筑科学—结构工程]