钢管混凝土叠合柱屈曲分析及施工技术研究  

Buckling Analysis and Construction Technique Study for Concrete-Filled Steel Tubes and Reinforced Concrete Composite Columns

作　　者：王毅 程波[2] 谢波[2] 周松国 

机构地区：[1]浙江省长兴县交通运输局,浙江长兴313100 [2]浙江工业大学建筑工程学院,浙江杭州310014 [3]温州路港集团有限公司,浙江温州325014

出　　处：《世界桥梁》2014年第4期74-78,共5页World Bridges

基　　金：国家自然科学基金项目资助(50908211);浙江省交通厅资助项目(2010H17);浙江省自然科学基金资助(LY13E080014)

摘　　要：腊八斤特大桥主桥为连续刚构,采用钢管混凝土叠合柱桥墩(由4根外侧包裹钢筋混凝土的钢管混凝土柱组成,柱之间采用钢筋混凝土腹板连接,桥墩为内部空心结构),最高桥墩高182.64m。为给高墩的施工及质量控制提供理论依据,采用ABAQUS和MIDAS软件对高墩进行屈曲和受力分析,研究墩顶施工偏差和支撑对高墩极限承载力的影响。结果表明:桥墩极限承载力随墩顶施工偏差的增大而不断减小;横撑和斜撑对高墩的整体稳定极限承载力影响较小。为减少施工过程对桥墩极限承载力的影响,保证墩身线形和施工质量满足要求,研究了高墩施工技术,即采用全站仪和激光垂准仪开展高墩中心、垂直度及高程监测,采用高抛免振捣、对角线对称浇筑混凝土和钢结构高空吊装等施工技术。实桥应用表明,实际累计施工偏差约为0.072m,满足施工过程中高墩线形及其它质量控制要求。The main bridge of Labajin Bridge is a continuous rigid-frame structure ,the piers a-dopt the concrete-filled steel tubes and reinforced concrete composite columns （a column is formed of four concrete-filled steel tubes that are externally encased with reinforced concrete ,the four steel tubes are linked to each other by reinforced concrete webs and the overall column is hollow in-side .） ,with the highest pier rising to 182 .64 m .To provide theoretical reference for the construc-tion and quality control of high-rise piers ,the ABAQUS and MIDAS software were used to analyze the buckling and load bearing condition of the concrete-filled steel tubular composite columns to study the impact of pier-top construction difference and supporting on the ultimate load bearing ca-pacity of high-rise piers .The results of the study showed that the ultimate load bearing capacity of piers gradually reduced as the construction deviation on pier tops increased .T ransverse struts and oblique struts had minor effect on the overall stability and the ultimate load bearing capacity of concrete-filled steel tubular composite column piers .To reduce the impact of construction process on the ultimate load bearing capacity of piers and ensure that the geometrical shape of pier shafts and the construction quality meet the requirements ,the construction techniques for high-rise piers were studied .The total station and laser vertical collimator were applied to monitor the center , verticality and elevation of the high-rise piers .T he construction techniques of high dropping vibra-tion-free concreting ,symmetrical diagonal concreting and overhead hoisting and erection of steel structures were used .The engineering experience proves that the measured accumulated construc-tion deviation is about 0 .072 m ,w hich can meet the geometry and other quality control require-ments for high-rise piers during construction .

关 键 词：连续刚构桥 桥墩 钢管混凝土叠合柱 屈曲分析 施工偏差 应力 有限元法 高空吊装 高抛免振混凝土 

分 类 号：TU398.9[建筑科学—结构工程]