世界桥梁
世界橋樑
세계교량
World Bridges
2015年
6期
68-72
,共5页
位东升%彭旭民%邹力%杨宏印
位東升%彭旭民%鄒力%楊宏印
위동승%팽욱민%추력%양굉인
箱梁桥%混凝土箱梁%顶板%斜裂纹%抗弯承载力%模型试验
箱樑橋%混凝土箱樑%頂闆%斜裂紋%抗彎承載力%模型試驗
상량교%혼응토상량%정판%사렬문%항만승재력%모형시험
box girder bridge%concrete box girder%top slab%oblique crack%anti-bending per-formance%model test
为了解斜裂纹对混凝土箱梁顶板抗弯承载能力的影响情况，采用局部结构缩尺模型试验方法，制作了长1117 m m、宽600 mm、高140 mm的箱梁顶板模型，通过弯剪加载实现混凝土箱梁顶板裂纹，对开裂试件进行化学灌浆，将试件分为完好、开裂、修补3种类型进行抗弯承载力试验。通过测试不同类型试件的加载力、位移和混凝土应变，分析斜裂纹对混凝土板的抗弯刚度及承载性能的影响，为该类病害处治提供试验依据。试验结果表明：3种试件竖向加载力与跨中位移、混凝土应变的变化关系基本一致，且极限承载力基本一致，斜裂纹对试件抗弯刚度、内力分布、抗弯极限承载力影响很小；3种试件的斜裂纹两侧未发现试件沿裂纹方向斜向错位现象，试件跨中底面横向开裂，斜裂纹对试件抗弯极限承载力的破坏形态影响很小。对此类病害，在桥面板承载能力验算满足规范要求的前提下，进行耐久性修复即可。
為瞭解斜裂紋對混凝土箱樑頂闆抗彎承載能力的影響情況，採用跼部結構縮呎模型試驗方法，製作瞭長1117 m m、寬600 mm、高140 mm的箱樑頂闆模型，通過彎剪加載實現混凝土箱樑頂闆裂紋，對開裂試件進行化學灌漿，將試件分為完好、開裂、脩補3種類型進行抗彎承載力試驗。通過測試不同類型試件的加載力、位移和混凝土應變，分析斜裂紋對混凝土闆的抗彎剛度及承載性能的影響，為該類病害處治提供試驗依據。試驗結果錶明：3種試件豎嚮加載力與跨中位移、混凝土應變的變化關繫基本一緻，且極限承載力基本一緻，斜裂紋對試件抗彎剛度、內力分佈、抗彎極限承載力影響很小；3種試件的斜裂紋兩側未髮現試件沿裂紋方嚮斜嚮錯位現象，試件跨中底麵橫嚮開裂，斜裂紋對試件抗彎極限承載力的破壞形態影響很小。對此類病害，在橋麵闆承載能力驗算滿足規範要求的前提下，進行耐久性脩複即可。
위료해사렬문대혼응토상량정판항만승재능력적영향정황，채용국부결구축척모형시험방법，제작료장1117 m m、관600 mm、고140 mm적상량정판모형，통과만전가재실현혼응토상량정판렬문，대개렬시건진행화학관장，장시건분위완호、개렬、수보3충류형진행항만승재력시험。통과측시불동류형시건적가재력、위이화혼응토응변，분석사렬문대혼응토판적항만강도급승재성능적영향，위해류병해처치제공시험의거。시험결과표명：3충시건수향가재력여과중위이、혼응토응변적변화관계기본일치，차겁한승재력기본일치，사렬문대시건항만강도、내력분포、항만겁한승재력영향흔소；3충시건적사렬문량측미발현시건연렬문방향사향착위현상，시건과중저면횡향개렬，사렬문대시건항만겁한승재력적파배형태영향흔소。대차류병해，재교면판승재능력험산만족규범요구적전제하，진행내구성수복즉가。
To examine the influence of oblique cracks on the anti‐bending performance of top slabs of concrete box girder ,the scale‐down model experimental method for local structures was employed and a top slab model of box girder with dimension of 1 117 mm by 600 mm ,140 mm high was prepared .Under the condition of applying bending and shearing loads ,cracks were found on the top slabs of concrete box girder .Then the samples with cracks were chemically grouted ,and the samples were classified into three groups of being undamaged ,cracked and remedied in the an‐ti‐bending performance tests .By testing the loads applied to different types of samples and their displacement and the concrete strains ,the influence of oblique cracks on the anti‐bending stiffness and load bearing capacity of concrete slabs was analyzed ,to provide testing references for deterio‐rations of such type . T he results of the testing indicate that the variation of the vertical loading forces for the three groups of samples is approximate to the variation of midspan displacement and concrete strain , and the ultimate load bearing capacity is also the same , showing that oblique cracks have minimal influence on the anti‐bending stiffness ,internal force distribution and the anti‐bending ultimate load bearing capacity of the samples .Along the two sides of oblique cracks of the three types of samples ,no inclined dislocation along the direction of cracking was found .The un‐derside of sample midspan transversely cracked ,and oblique cracks have slight influence on the damaging modes of the anti‐bending load bearing capacity of the samples .For such kind of deterio‐ration ,the remedy of durability can be carried out on the premise that the checking calculation of the load bearing capacity of the slabs meets the code requirements .
