| 后浇UHTCC加固既有混凝土复合梁的弯曲控裂性能 |
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| 引用本文： | 徐世烺,王楠.后浇UHTCC加固既有混凝土复合梁的弯曲控裂性能[J].中国公路学报,2011(3). |
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| 作者姓名： | 徐世烺 王楠 |
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| 作者单位： | 大连理工大学海岸和近海工程国家重点实验室;大连市建筑科学研究设计院股份有限公司; |
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| 基金项目： | 国家自然科学基金重点项目(50438010) |
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| 摘 要： | 对不同厚度的既有普通混凝土梁体受弯一侧浇筑超高韧性水泥基复合材料(UHTCC)制成定截面复合梁,通过四点弯曲试验对2种材料结合后的整体工作性能,以及UHTCC层作为外浇层对表面裂缝的分散和限制能力进行试验研究。通过平截面假定法和平衡方程,采用受约束的混凝土受拉本构模型,推导计算了复合梁整体受力过程中不同阶段的极限承载力。结果表明:通过纤维的桥联和应力传递作用,UHTCC层能有效控制裂缝的生成和扩展,并将上层混凝土中出现的单条宽裂缝分散成多条细密裂缝;UHTCC层的加入提高了复合梁的承载能力,限制了混凝土裂缝的开展,增强了整体延性;受拉一侧UHTCC所占的比例越大,复合梁中点挠度越大,极限弯曲强度越高;混凝土强度等级越高,UHTCC层对复合梁前期强度影响越小,但后期整体韧性改善依旧显著;极限承载力计算值与实测值符合较好。
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| 关 键 词： | 桥梁工程 复合梁 弯曲试验 裂缝控制 |
Flexural Crack Control Performance of Existing Concrete Composite Beam Reinforced by Post-poured UHTCC |
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| XU Shi-lang,WANG Nan.Flexural Crack Control Performance of Existing Concrete Composite Beam Reinforced by Post-poured UHTCC[J].China Journal of Highway and Transport,2011(3). |
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| Authors: | XU Shi-lang WANG Nan |
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| Institution: | XU Shi-lang1,WANG Nan2(1.State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China,2.Dalian Research & Design Institute of Building Science Stock Co.,Ltd,Dalian 116021,China) |
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| Abstract: | Through pouring ultra high toughness cementitious composite(UHTCC) at flexural side of existing conventional concrete beam with different depths,fixed cross section composite beams were made.Integral working performance combined with two materials by four-point bending test and capacities of UHTCC layer for separating cracks and restricting crack propagation were studied.Using restricted concrete tensile constitutive model,the ultimate bearing capacities in process of integral force of composite beam with d... |
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| Keywords: | bridge engineering composite beam flexural test crack control |
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