摘要
通过3根不同预应力值的外包钢组合梁抗弯性能的试验研究,分析了其在预应力内荷载和外荷载作用下试件的挠度和截面应变的变化规律及预应力对组合梁抗弯性能的影响.研究表明预应力外包钢组合梁各组合材料能够变形协调,使组合材料能够发挥各自的力学性能共同工作.根据直接内载法的原理,把预应力筋应力划分为主动应力和被动应力两部分,分阶段研究预应力筋应力对结构作用效应.根据试验结果和预应力筋应力分类的结果,依据变形协调原理建立了组合梁抗弯计算理论模型,分析了预应力外包钢组合梁在受荷各阶段抗弯承载力.在理论模型计算中,采用了逐步搜索试位法,确定组合梁截面受压区高度.其理论结果表明合理有效.
Based on experimental study of three prestressed reinforced concrete encased in steel plate composite beams, the law of deflection and sectional strains in midspan of samples is presented. Bending resistance per- formance of composite beams is improved by prestressing force. Mechanical performance of the composite materi- al can be completely utilized. By principle of prestressed internal load, the stress of tendons is divided into active stress and passive stress. According to deformation compatibility theory, the bending resistance model is pro- posed and the regular falsi method of searching step by step is used in calculating the height of compression on composite beams section. Theoretical results show that the proposed model is valid and effective.
出处
《江苏科技大学学报（自然科学版）》
CAS
北大核心
2011年第6期540-545,共6页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
辽宁省自然科学基金资助项目(03023685)
关键词
预应力
试位法
外包钢
抗弯性能
pretressing force
regular falsi method
reinforced concrete encased in steel plate
bending resist-ance performance
