文档介绍：预应力连续箱梁桥开裂状态受力性能试验研究李克忠(湖南大学设计研究院,湖南长沙410082) 摘要:在桥梁的日常养护过程中,如何对开裂桥梁的承载能力进行简单快速的初步估算,一直是困扰桥梁养护工作者的一大难题。本文以一个l:4的三跨预应力连续梁模型试验结果为基础,;通过各级荷载作用下模型裂缝宽度Wl与极限状态时裂缝最大宽度WR的比值(Wl八Vft)和对应的截面弯矩承载率(Ml/M。)之间的关系,得出了裂缝宽度比值与承载率的函数关系。本文得出的结论可对桥梁的实际受力状态、承载潜力和安全性进行初步估算和评估,有一定的应用价值。关键词:预应力混凝土连续箱梁;开裂状态;修正系数;截面承载率中图分类号: 文献标识码: 文章编号: Experimental study on thebehavior ofprestressed concrete continuous boxgirder withcracks LiKezhong (Desigen and reascrach ofHunan Univisersity,Changsha 410082,Huriah) Abstract:It’S always been adifficultproblem forthebridge maintenance en咖'crs onh嗍to make apreliminary estimate within theleasttime On thebearing capacity ofbridges withcracksduring thedaily maintenance paper was based on themodel results ofa three—span PC continuous girder withthescale I: was made paring the value fiI赋to alculating value and thenthenonlinear calculating value respectively which deduced theadjustment coefficient forestimating theload ofthe structures with cracks on thebasis ofthe alculating value according parison ,the function between thecrack width ratioand thebearing capacity ratiowasobtai∞dby applying thestep loads themodel get theratioofthemodel crackwidth Wl tlndcl"each loadstep tothemodel crack maximum widthWn under thelimitstate(Wl,Wn)and thecorresponding relationship ofthesectional mo