严重开裂PC箱梁桥加固  

Strengthening of a PC Box Girder Bridge with Severe Cracks

作　　者：杨琪[1] 李卫明[2] 黄建跃[2] 石雪飞[3] 

机构地区：[1]广东省佛开高速公路有限公司,广东佛山528051 [2]广东省交通集团有限公司,广东广州510101 [3]同济大学桥梁工程系,上海200092

出　　处：《世界桥梁》2010年第2期59-62,共4页World Bridges

基　　金：广东省交通厅科技项目(2007-17);国家高技术研究发展计划(863计划)(2007AA11Z103)

摘　　要：以某高速公路上一座运营超过12年、主梁严重开裂的预应力混凝土等截面连续箱梁桥为例,分析箱梁底板、腹板的"U"形、"L"形裂缝成因,并评估加固前结构技术状态,采用箱梁跨中正弯矩区腹板加厚并在加厚段内增设有粘结预应力束、底板粘贴钢板条,墩顶负弯矩区增设扁锚式无粘结预应力钢束和桥面铺装"黑改白"(由沥青混凝土改造成钢筋混凝土)等综合加固方案对该桥加固试验段进行加固。加固前、后进行3次荷载试验,评估桥梁结构技术状态。理论计算和荷载试验结果表明,加固效果良好,加固方案可行,桥梁实际承载能力大幅提高。A bridge on an expressway is a prestressed concrete(PC) constant section continuous box girder bridge that has been in operation over 12 years and whose main girder has severe cracks.The formation causes of the U-shape and L-shape cracks in the bottom slab and webs of the box girder of the bridge were analyzed and the structural conditions of the bridge before it was strengthened were evaluated.A trial strengthening section of the bridge was late strengthened by the comprehensive strengthening schemes of th...

关 键 词：连续梁桥 PC箱梁 裂缝 加固 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]