预应力钢箱高强混凝土组合箱梁抗弯承载能力研究  

Study of the bending capacity of prestressed Steel-HSC composite box beams

作　　者：胡少伟[1] 陈亮[1] 胡汉林[1,2] 

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]广东省水利水电科学研究院,广东广州510610

出　　处：《土木工程学报》2011年第6期26-33,共8页China Civil Engineering Journal

基　　金：江苏省自然科学基金项目<预应力高强组合箱梁桥复合受力性能分析与设计>(BK2007010);人事部留学人员回国科技项目<钢-高强混凝土组合桥梁复合受力性能>(Q40502);南京水利科学研究院中央级公益性科研院所重大项目<预应力组合箱梁桥复合受力性能与设计理论研究>(Y40705)

摘　　要：预应力钢箱高强混凝土组合梁将组合梁技术、现代预应力技术与高强混凝土有机结合在一起,已在工程中广泛使用,其抗弯能力是工程上最为基本也是最重要的要求。为掌握预应力钢箱高强混凝土组合梁的受弯性能,得到其极限抗弯承载能力,设计足尺试验梁。试验在自行研制的试验装置上进行;得到试验梁的弯矩挠度曲线、滑移特征曲线、预应力筋应力力增量及截面高度应变分布等重要参数,描述其破坏形态。后根据内力平衡和弯矩平衡分析,得到预应力钢箱高强混凝土组合梁极限抗弯承载力计算公式。并选取众多文献的组合梁试验结果,进行计算值和实测值对比分析,结果吻合良好。提出的极限抗弯承载力计算方法适用于采用普通钢的组合梁和预应力组合梁。而对于高强钢预应力组合梁采用简化塑性理论计算结果稍大。总体而言,预应力筋的存在能提高组合梁的弹性工作范围和极限抗弯承载力,减少结构变形,使普通钢-高强混凝土组合梁具有更好的工作性能。The prestressed Steel-HSC（high strength concrete） composite box beams embody combined composite beam technology and prestressed high strength concrete techniques,and are widely used in civil engineering,with its bending capacity as one of the most fundamental characteristics.Full-scale specimens were designed and tested with a self-manufactured bending system.The bending-deflection relationship,slip distribution,incremental stress and strain development were measured,and the failure modes were analyzed.Based on the internal forces and moment equilibrium,the ultimate bending capacity formula was derived.The calculated values are in general agreement with the test data.The calculation methods for the ultimate bending capacity are suitable for composite beams and prestressed composite beams with common steel.By using simplified plastic theory,the calculated results are a little larger than the test data for prestressed composite beams with high strength steel.

关 键 词：预应力钢箱高强混凝土组合梁 抗弯试验 内力增量 抗弯承载力计算公式 

分 类 号：TU317.1[建筑科学—结构工程] TU398