[1]胡庆安,丛慧敏,齐明芹.连续梁、连续刚构桥施工中腹板产生裂缝的机理及对策[J].西安建筑科技大学学报:自然科学版,2011,43(03):353-355.[doi:DOI :10.15986/j .1006-7930.2011.03.011]
　HU Qing-an,CON G Hui-min,QI Ming-qin.The mechanism and countermeasure of cracks in webs duringcontinuous beam and continuous rigid frame bridge constructing[J].J.Xi’an Univ. of Arch. & Tech.:Natural Science Edition,2011,43(03):353-355.[doi:DOI :10.15986/j .1006-7930.2011.03.011]
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连续梁、连续刚构桥施工中腹板产生裂缝的机理及对策()
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西安建筑科技大学学报:自然科学版[ISSN:1006-7930/CN:61-1295/TU]

卷:
43
期数:
2011年03期
页码:
353-355
栏目:
出版日期:
2011-06-30

文章信息/Info

Title:
The mechanism and countermeasure of cracks in webs during
continuous beam and continuous rigid frame bridge constructing
文章编号:
1006-7930(2011)03-0353-03
作者:
胡庆安;  丛慧敏;  齐明芹
(长安大学公路学院, 陕西西安710064)
Author(s):
HU Qing-an ;  CON G Hui-min ; QI Ming-qin
(Scho ol of Highw ay , Chang’ an Univer sity , Xi′an 710064)
关键词:
连续梁; 连续刚构; 腹板裂缝; 主拉应力; 施工顺序
Keywords:
continuous beam ; continuous rigid f rame ; webs crack s ; max imum principal tensile stress ; sequence o f construction.
分类号:
U44;U45
DOI:
DOI :10.15986/j .1006-7930.2011.03.011
文献标志码:
A
摘要:
要:随着连续梁和连续刚构桥的广泛应用, 一些桥梁在施工过程中腹板出现裂缝.本文以弹性力学为依
据, 运用Ansy s 建立连续梁、连续刚构桥三维实体模型, 计算混凝土腹板三向受力情况下的主拉应力, 并对比
腹板内最大主拉应力与混凝土抗拉强度的关系, 由此说明腹板产生裂缝的原因.结合实际桥梁, 计算悬臂现浇
法施工时四种工况下混凝土腹板应力, 得出最大主拉应力为:0 .67 MPa 、0.32 MPa 、2 .76 MPa 和0 .98 MPa .
由此说明竖向预应力能有效控制腹板混凝土的主拉应力, 即为了预防混凝土腹板内部主拉应力超过混凝土
抗拉强度, 应在施工时先张拉竖向预应力, 再张拉纵向预应力钢筋.
Abstract:
With the w ide application o f continuous beam and co ntinuous rig id fr ame bridge s, cracks in webs w as found in
some bridges during the construction .This essay is ba sed on Elastic Mecha nics , utilizing Ansys to e stablish the three-dimensional
mo del of continuous beam and continuous rig id frame bridge s, calculating the maximum principal tensile stress
of concrete webs which is str essed from th ree directions , and compa ring the relatio nship be tween the ma ximum principal
tensile stress in w ebs and the tensile streng th of concrete .Therefo re , the reaso n of the c racks appear on webs can be co ncluded
.Combined with an actual bridge , adopting the method o f Cantilever cast-in-place during constructio n with ma ste r
stress o f concrete in four conditions , the ma ximum principal tensile stress can be ca lculated as 0.67 MPa 、0 .32 MPa 、2.76
MPa and 0.98 MPa .Consequently , it is illustrated that ver tical prestre ss co uld contr ol tension stress o f w ebs effectively .
That is to say , in o rde r to pr ev ent inter nal tensio n stress in webs fr om exceeding the tensile strength of co ncrete , one
should str etch the ver tical pre st ress firstly and then stretch the v ertical prestress .

参考文献/References:

参考文献　References
[ 1] 　兰晓红.现浇箱梁桥预应力钢束顶板张拉和腹板张拉方案比较[ J] .福建建设科技, 2010(05):27-29 .
LAN Xiao-hong .Tensioning Scheme Compa rison of the Cast- in- site Pre-st ressed Concrete Continuous Bo x Girde r
Bridge[ J] .Fujian Construction Science & Technolog y , 2010(05):27-29 .
[ 2] 　徐　晨, 吴　冲, 潘　蕾, 等.拖拉施工锚固系统对多跨连续槽形钢梁腹板局部受力的影响[ J] .结构工程师, 2009,
25 (1):30-33 , 40 .
XU Chen, WU Chong , PAN Leim , et a l.Influences of Anchor Sy stem on W eb Stre ss of Multi.S pan Co ntinuous
Steel Tub-Girders During Hauling Constructio n[ J] .Str uctural Eng ineers , 2009, 25(1):30-33, 40 .

备注/Memo

备注/Memo:
＊收稿日期:2010-07-26 　　修改稿日期:2011-04-12
作者简介:胡庆安(1956-), 男,江苏南京人, 教授, 硕士研究生导师, 主要从事桥梁结构分析、桥梁抗风及抗震控制研究
更新日期/Last Update: 2015-11-02