作　　者： ; ; ; ;

机构地区： 北京工业大学建筑工程学院工程抗震与结构诊治北京市重点实验室

出　　处： 《中国公路学报》 2011年第4期33-38,共6页

摘　　要： 为了探讨大尺寸钢管混凝土柱的初始偏心和开洞插管初始缺陷对其承载力的影响规律,以某钢管混凝土拱桥主拱肋Φ1 200×24 mm钢管为原型,采用1∶2.4,1∶4.8两种几何比例尺分别制作了长径比为3∶1的钢管混凝土柱试件,进行了轴压和偏压试验,并将承载力试验结果与中国现行相关规范的承载力计算结果进行了对比。结果表明:钢管混凝土柱的承载力试验值均大于规范计算值,大尺寸试件和小尺寸试件轴压承载力与规范的比值相差不大,但是大尺寸试件的屈服应力较高,开洞插管的试件由于内插钢管的屈服失效而导致整体试件屈服应力较低;CECS 28:90规范对承载力的规定与试验值较为接近,DL/T 5085—1999规范对承载力的规定安全系数最高;偏心受压和开洞插管均会导致钢管混凝土柱承载力降低,降幅分别达22%和15%。 In order to study the bearing capacity of large size concrete filled steel tubular（CFST） columns and the influence of initial eccentricity and imperfection of opening hole and insertion pipe on the column,taking a main arch rib Φ1 200×24 mm of a CFST arch bridge as research prototype,authors designed ten CFST column specimens whose draw ratios are 3∶1.According to different scales of 1∶2.4 and 1∶4.8,the axial and eccentric compression tests were carried out,and comparisons on test values and calculated values by several domestic codes for bearing capacity were made.Result shows that test values are all larger than the calculated values for bearing capacity of CFST column,and the ratio of bearing capacity of large size specimen and calculated value is almost same to the ratio of bearing capacity of small size specimen and calculated value.However,yield stress of the large size specimen is larger than that of the small size specimen,and the specimen with opening hole has the smaller yield stress because of the smaller yield stress of the insertion pipe.The calculated values of bearing capacity according to the code CECS 28：90 is closer to the test value,while the safety factor of the bearing capacity calculated by the code DL/T 5085—1999 is the largest.Eccentric compression,opening hole and insertion pipe can induce to the decrease of bearing capacity,its decreasing amplitude can reach 22% and 15% separately.

关 键 词： 桥梁工程 大尺寸钢管混凝土柱 承载力试验 偏压 初始缺陷 开洞插管

领　　域： [建筑科学] [交通运输工程]