钢筋砼现浇箱梁腹板裂缝成因分析.pdf

* 丁 勇 赵启林 马方圆 段金辉 (, 210007) : 88 23 , , , : , : ; ; ; ; ANALYSIS OF VERTICAL WEB CRACKS OF ORDINARY REINFORCED CONCRETE BOX-GIRDER BRIDGE ing Yong Zhao Qilin Ma Fangyuan uan Jinhui (Engineer Institute of Engineering Corps, PLA Univ1 of Sci1 Tech1 , Nanjing 210007, China) Abstract: uring 23 detection statistics of 88 ordinary reinforced concrete box-girder bridges in Jiangsu Province, vertical web cracks were found to be the commonest hazard of this type of bridge1 Based on detecting and related experimental data on a specific bridge, taking hydration, difference in temperature for sunshine, relative humidity increment and self-shrinkage increment all into consideration, the stress state of web is calculated with FEM1 The results of analysis and calculation show that hydration is a major factor of web cracks during molding board dismantlement, the latter expansion of cracks is mainly because of shrinkage increment of web and reinforced binding when concrete shrinkage as a whole1 Keywor s:vertical cracks; box-girder; web; shrinkage; cracks ) , 15) () , 16) , 17) 0 () , 18) ( , ) , 19) () , 20) , () , 21) ( ) ,22) , ,23) , , : 1) , , L /4 23 , : 1) () ,2) () ,3) 2) , () ,4) () ,5) , 6) ,7) (- 3) , ) , 8) ,9) ( ) , 10) () , 11) * 863 ( 2007AA11Z120) () , 12) ( : , , 19858 , : 2008- 12- 10 ) , 13) () , 14) Industrial Construction Vol1 39, Supplement, 2009