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面对近年来出现的许多注浆新工艺、新材料、新技术,通过分析注浆加固的技术特点,分别对高压旋喷注浆法、静压注浆法的关键技术与应用问题进行了探讨,以积累建筑物地基加固经验。 相似文献
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随着经济全球化发展,大都市区或全球城市区域越来越成为世界政治、经济和社会发展的战略空间单元。早在20世纪50年代,美国就已经出现了许多跨越州界的大都市区,并形成了一些卓有成效的跨界治理方法与策略。本文主要对美国跨州大都市区的跨界治理举措与经验进行了梳理和总结,以便对我国长三角、京津唐、珠三角三大都市圈跨界治理提供有益的经验借鉴。 相似文献
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《Planning》2016,(19)
近年来,各地小型农村水利改革蓬勃发展,创造了许多新的经验,取得了一定成效。如何推动改革深入健康进行,使农村水利建设与管理的政策逐步完善,走上正规化、法制化轨道,需要对改革思路和深层次政策问题进行认真研究。本文对此进行了相关的分析研究。 相似文献
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以呼铁佳园住宅楼为例,对大模板的设计与实施进行了论述,并总结了大模板应用经验,提出了许多细节问题的处理方法和有价值的指导意见,为大钢模板的进一步推广应用奠定了基础。 相似文献
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《Planning》2014,(12)
当今,养殖小区在我国许多地区如雨后春笋出现,因此,对其的科学管理与防控疫病便有着举足轻重的地位。本文结合了实际工作经验与相关资料,对目前养殖小区疫病防控与管理中存在的问题进行了分析,针对问题提出了相关完善对策。 相似文献
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FRP约束混凝土柱强度承载力计算 总被引:29,自引:4,他引:25
FRP复合材料由于具有高强、轻质、抗腐蚀和耐疲劳、温度作用下稳定性好等特点 ,因而受到土木工程界的关注 ,正被越来越广泛地应用于柱结构的修复加固中 ,取得了良好的经济效益和建筑效果。为此 ,简要介绍了目前已提出的对FRP约束混凝土柱承载力的典型计算方法 ,并进行了分析 ,在此基础上 ,提出了一种承载力简化计算方法 ,计算结果和大量试验结果吻合良好 ,研究成果可供工程界参考。 相似文献
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连续纤维复合材料及其发展历程 总被引:1,自引:0,他引:1
介绍了连续纤维复合材料 (FRP)的诞生和发展 ,日、美、欧等发达国家和地区已投入了大量的人力和物力进行其在土木工程中的研究开发 ,并取得了不少成功的可借鉴的经验。 相似文献
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This paper describes a series of laboratory tests investigating the behaviour of a large model masonry arch bridge repaired with externally bonded fibre-reinforced polymer (FRP) on its intrados. Many similar masonry arch bridges form critical links in the world’s transport infrastructure, but they are often not suited to the increased demands of modern traffic loading, especially in ageing arch structures that have suffered structural deterioration. FRP plates, adhesively bonded to the intrados of the masonry arch are a convenient method for strengthening arch bridges. The tests described in this paper demonstrated that FRP strengthening is an effective technique for improving the structural performance of a masonry arch bridge.A two-span, single-ring semi-circular brick arch bridge was tested in this study, complete with fill material. Each of the spans was initially loaded to investigate their response and to establish a four-hinge collapse mechanism, simulating damage prior to strengthening. FRP strengthening was then applied to the two arches, and each of the spans was again tested separately until the failure of the strengthening system. The global (load and deflection) and local (crack width and FRP strain) response of the structure was recorded. The FRP strengthening resisted flexural crack opening in the masonry, and hence prevented a four-hinge mechanism collapse. Failure instead occurred when the FRP strengthening debonded from the masonry adjacent to an existing intrados hinge crack. As well as shear debonding adjacent to flexural cracks in the masonry, peel debonding occurred where shear deformation occurred across a masonry crack. Catastrophic collapse did not occur, as the FRP continued to contribute to the load capacity by acting as a tie after the ultimate load had been reached. 相似文献
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通过对钢筋混凝土管加固有限元分析,得出其内水压力-应变变化规律,并对粘钢、粘贴玻璃纤维和粘贴碳纤维三种粘贴方式的加固效果进行了比较。分析表明,粘贴碳纤维和玻璃纤维比粘贴钢板有明显的优势。 相似文献
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FRP在工程结构中的应用与发展 总被引:86,自引:0,他引:86
FRP(纤维增强复合材料)近年来在混凝土结构加固中得到广泛的应用,并作为一种新型高性能结构材料受到结构工程界的广泛关注,国内外有关研究和工程单位开展了大量的研究和实践应用。本文介绍了结构工程中常用的FRP材料性能和形式,分析了其优点与不足,并介绍了FRP加固结构、FRP配筋和预应力FRP筋混凝土结构、FRP结构与FRP组合结构以及FRP在桥梁结构、大跨空间结构和智能结构中的应用与发展,以期促进我国土建结构工程中对这一新型高性能材料应用和研究工作的开展。 相似文献
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《钢结构》2012,(10):84
在过去的20年中,纤维增强复合材料凭借其高强重比和良好的抗腐蚀性等独特优势,逐渐获得在实际土木工程应用中的广泛认可。特别是对使用纤维增强复合材料在加固混凝土结构方面进行了广泛研究。最近,使用纤维增强复合材料来加固现有的钢结构的方法引起了关注。文章首先对合理开发使用纤维增强复合材料来加固钢结构的方法进行讨论。之后对现有的运用纤维增强复合材料加固的钢结构的研究进行评论和阐述。评论涵盖的论题包括钢材表面粘合剂处理、粘合剂的挑选、纤维增强塑料和钢材之间的粘结性能及其合适的建模、钢梁抗弯加固、钢结构抗疲劳加固、薄壁钢结构的抗局部屈曲的加固、以及通过外部纤维增强塑料对中空管或混凝土填充钢管进行加固。文章最后对未来需进一步研究的问题进行了展望。 相似文献
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Over the past two decades, fiber-reinforced polymer (FRP) composites have gradually gained wide acceptance in civil engineering applications due to their unique advantages including their high strength-to-weight ratio and excellent corrosion resistance. In particular, many possibilities of using FRP in the strengthening and construction of concrete structures have been explored. More recently, the use of FRP to strengthen existing steel structures has received much attention. This paper starts with a critical discussion of the use of FRP in the strengthening of steel structures where the advantages of FRP are appropriately exploited. The paper then provides a critical review and interpretation of existing research on FRP-strengthened steel structures. Topics covered by the review include steel surface preparation for adhesive bonding, selection of a suitable adhesive, bond behavior between FRP and steel and its appropriate modeling, flexural strengthening of steel beams, fatigue strengthening of steel structures, strengthening of thin-walled steel structures against local buckling, and strengthening of hollow or concrete-filled steel tubes through external FRP confinement. The paper concludes with comments on future research needs. 相似文献