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外贴钢板及碳纤维布加固钢筋混凝土梁正截面试验与数值分析(刘海祥)

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(BI `H`:]\0【作者】刘海祥 【导师】洪晓林; 陆采荣水利论文 y4W$^6s ?1R1H6Q~
【作者基本信息】南京水利科学研究院,水工结构工程,2002年,硕士

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XP})x8O0【中文摘要】 我国有大量的钢筋混凝土结构,由于各种原因,结构承载力不足,影响正常使用和安全运行,只有采取除险加固措施,才能保证结构安全。外贴钢板和碳纤维布(简称CFRP)加固钢筋混凝土结构是方便、快捷、有效的加固方法,尤其是碳纤维布加固是近年新兴的加固方法。加固后,钢筋混凝土结构为多相复合结构,结构受力机理复杂,仍有许多内容需要分析及研究。本文采用数值分析和钢筋混凝土梁试验相结合的方法,对外贴钢板和碳纤维布加固梁进行分析及研究。 通过外贴钢板及碳纤维布加固钢筋混凝土梁试验,得到了不同加固形式下梁荷载-挠度关系曲线,钢板(碳纤维布)应变,梁裂缝分布。结果表明,外贴钢板和碳纤维布是加固钢筋混凝土梁正截面,提高梁抗弯承载力的有效办法。 引用整体式钢筋混凝土单元模拟钢筋混凝土梁,采用节理单元模拟胶结层界面力学行为,一维杆单元模拟碳纤维布和钢板力学行为,对加固梁整体性能及胶结层性能进行非线性数值模拟分析。表明在碳纤维端部采用一定的过渡段,可以缓和碳纤维布端部胶结层应力集中现象。 结合韩庄闸公路桥钢筋混凝土T梁加固工程结构二次受力问题,提出了在加固结构非线性有限元分析中采用分组分级加载方法,分析了T梁加固的必要...更多性及可行性。  还原水利论文 ]8N _+S1?S

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【英文摘要】 Changing social needs, upgrading of design standards, increased safety requirements, and deterioration result in existing reinforced concrete structures such as bridges and buildings that need to be strengthened. Externally bonding Carbon Fiber Reinforced Polymer (CFRP) and steel plate to reinforce RC structures are new methods. Since strengthened structures become multiphase, the interfacial bonding mechanism is complex.The interfacial bonding mechanism of the reinforced beams are researched theoretically by NFEM and experimentally by beams experiments. The displacement of beams, strain of steel plates, the cracks distributing on the beams and bending capability are observed, which indicates that externally bonding CFRP and steel plate is an efficient method to improve the beam bending capacity.The layer element is adopted to simulate and analyze the adhesive layer, and the truss element is taken to simulate and analyze the CFRP and steel plate. The strengthened beams' and the adhesiv...更多e layer's performance are discovered.Grouping and grading the load to analyze the reinforced structure was brought forward to analyzed several T-beams by CFRP was which was a second forced structure. It is indicated that the stress concentration at the end of the CFRP can be reduce in a certain degree when there is a decrement.  还原

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【中文关键词】 钢筋混凝土梁; 加固; 钢板; 碳纤维; 数值分析; 试验; 界面应力
#?F#eV f.rsBx?0【英文关键词】 reinforced concrete; strengthen; bonding; steel plate; carbon fiber reinforced polymer; finite element method; bonding mechanism

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TAG: 数值分析 梁正 钢筋混凝土 碳纤维 截面
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