缓粘结预应力混凝土结构试验研究.pdf

第24卷第2期铁道学报Vol.24No.22002年4月JOURNALOFTHECHINARAILWAYSOCIETYApril2002文章编号:100128360(2002)0220095205缓粘结预应力混凝土结构试验研究赵建昌王起才(兰州铁道学院土木建筑学院甘肃兰州730070)摘要:通过缓粘结预应力混凝土受弯构件实验研究给出了不同龄期下张拉预应力筋所需克服的摩阻力范围从开裂弯矩、极限弯矩、裂缝形式和荷载2挠度曲线等各个方面把缓粘结预应力构件与传统的后张法(有粘结、无粘结)预应力构件进行了对比分析得出缓粘结预应力构件在张拉两个月后其工作性能可等同于有粘结预应力构件的结论为缓粘结预应力体系设计提供了依据。关键词:缓粘结;预应力混凝土梁;实验研究;张拉摩阻力;工作性能中图分类号:TU378.2文献标识码:AExperimentstudyonprestressedconcretebeamsofpostponingcondensationZHAOJian2changWANGQi2cai(SchoolofCivilandArchitecturalEngineeringLanzhouRailwayUniversityLanzhou730070China)Abstract:Onthebasisoftheexperimentofprestressedconcretebeambyplacingmaterialofpostponingcon2densationbetweenconcreteandprestressed2bartherangeoffrictionresistancewhichneedstobeovercomewhenprestressedbarsaretensionedispresented.Throughcomparingtheprestressedconcretebeamwiththetraditionalpost2tensionedprestressedconcretebeamintheaspectssuchascrackmomentsultimatemomentscrackformsload2deflectiongraphandsoontheconclusionhasbeengainedthattheperformanceofthepre2stressedconcretebeamisalmostassameasthetraditionalpost2tensionedprestressedconcretebeamwhichhasstickyforcebetweenconcreteandprestressed2bar.Theconclusionofthispapercanprovidereferencesforthedesigneroftheprestressedconcretesystem.Keywords:pos