预应力钢骨混凝土梁裂缝控制试验研究与理论分析  

EXPERIMENTAL STUDY AND THEORETICAL ANALYSIS ON CRACK CONTROL THEORY OF PRESTRESSED STEEL REINFORCED CONCRETE(PSRC) BEAM

作　　者：徐杰[1] 戴航[1] 赵国栋[1] 傅传国[2] 周晓娜[2] 

机构地区：[1]东南大学,江苏南京210096 [2]山东建筑大学,山东济南250014

出　　处：《工业建筑》2008年第5期88-92,共5页Industrial Construction

基　　金：山东省教育厅科技计划重点项目(03L05)。

摘　　要：预应力钢骨混凝土梁(PSRCB)是在钢骨混凝土梁(SRCB)基础上采用预应力技术的一种新型组合结构,利用钢骨混凝土技术提高混凝土结构的承载能力,利用预应力技术改善钢骨混凝土结构在正常使用极限状态下的性能,从而发挥更好的结构综合效能。对8根PSRCB和6根对比SRCB进行了全过程载荷试验,并对PSRCB裂缝发生、开展和分布进行了详细的观测。在试验研究基础上,对PSRCB的裂缝控制标准、最大裂缝宽度计算、裂缝闭合性能等进行了理论分析。研究表明:PSRCB具有良好的抗裂性能;其裂缝向上延伸高度和受拉钢筋应力大大减小从而使裂缝的宽度变小;裂缝闭合性能良好;正常使用性能得到明显的改善。PSRCB is a new type prestressed composite beam which uses prestressing technology in SRCB . The H-section steel inside increases its flexural strength and prestressing technique improves its working performance. Eight PSRC beams and six SRC beams have been done and the development and distribution of cracks have been observed carefully. On the basis of the experiment, criterion of crack control and computation of maximum crack width of PSRC beam, and crack closing are discussed. Research indicates that PSRC beam has a better serviceable performance by contrast to SRC beam： better resistance to crack ; smaller strain of tensile rebar and crack width; better crack closing performance.

关 键 词：钢骨混凝土 预应力 梁 裂缝宽度 裂缝闭合 

分 类 号：TU398.9[建筑科学—结构工程]