CFRP-钢管混凝土轴压构件试验研究  

Experimental Study on Concentrically Compressed Concrete Filled Cir cular CFRP-Steel Tubular Members

作　　者：王庆利[1] 李宁[2] 韩佛[1] 朱贺飞[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]沈阳市开发建设管理办公室,辽宁沈阳110013

出　　处：《沈阳建筑大学学报（自然科学版）》2006年第5期709-712,725,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金(50408032);辽宁省自然科学基金(20031001);辽宁省教育厅科研项目计划青年基金(2004F107)

摘　　要：目的了解圆截面CFRP-钢管混凝土轴压构件的静力性能,分析长径比和弯曲增强系数对该类构件极限承载力和承载力提高率的影响.方法对12根构件开展静力试验并对试验结果进行分析.结果对于长径比较大的试件,纵向受拉区柱中截面纵向CFRP先于纵向受压区柱中截面环向CFRP断裂;对于长径比较小的试件,纵向受压区柱中截面环向CFRP先于纵向受拉区柱中截面纵向CFRP断裂.试件的载荷-柱中挠度曲线可以分为弹性阶段、弹塑性阶段、塑性阶段和下降段;笔者研究对象的延性优于FRP筒内填混凝土轴压构件.结论在长径比相同的条件下,随着弯曲增强系数的增加,极限承载力提高;在弯曲增强系数相同的条件下,随着长径比的增加,极限承载力降低.在长径比相同的条件下,承载力提高率近似随着弯曲增强系数的增加而线性提高;在弯曲增强系数相同的条件下,纵向CFRP对于较大长径比试件的极限承载力提高效果比较显著.Twelve concentrically compressed concrete filled circular CFRP - steel tubular members are experimentally investigated and the test results are analyzed as well in order to understand their static performances and the influences of slenderness ratio and bending strengthening factor on the ultimate load bearing capacity and the load bearing capacity enhancement ratio. It was found that for specimens with larger slenderness ratio, longitudinal CFRP breaking at specimen middle cross- section of longitudinal tension region is earlier than circumferential CFRP breaking at specimen middle cross - section of longitudinal press region, and for specimens with smaller slenderness ratio, circumferential CFRP breaking at specimen middle cross-section of longitudinal press region is earlier than longitudinal CFRP breaking at specimen middle cross- section of longitudinal tension region. Within the factors scope of this test, the P （load） - （δ middle point deflection of the specimens） curves can be defined as the following stages： elastic stage, elasto- plastic stage, plastic stage and softening stage. The ductility of the members investigated here is better than that of the concentrically compressed concrete filled circular FRP tubular members. Under the condition that other factors are the same, the larger the bending strengthening factor, the larger the ultimate load bearing capaci- ty, and the larger the slenderness ratio, the smaller the ultimate load bearing capacity. Load bearing capacity enhancement ratio increases nearly linearly with that of bending strengthening factor for members with the same slenderness ratio, and longitudinal CFRP has more significant affect on load bearing capacity enhancement for members with larger slenderness ratio.

关 键 词：圆截面CFRP-钢管 内填混凝土 轴压构件 试验研究 长径比 弯曲增强系数 承载力 承载力提高率 

分 类 号：TU393[建筑科学—结构工程]