玻璃纤维加固桥梁结构的试验与应用

根据室内试验数据分析，提出高强复合纤维材料进行混凝土抗弯加固、修复的计算方法，并结合工程实际予以应用，总结出该加固法的施工工艺以及技术关键，进一步推广这种新材料用于桥梁结构加固。     

碳纤维复合材料在桥梁加固中的应用研究

就碳纤维复合材料在桥梁加固中的工艺进行了阐述,提出了加固技术的质量保证措施。     

高强纤维在混凝土结构改造加固工程中的应用

本文从材料性能、试验制作到实际应用三方面,论述了高强纤维在混凝土结构改造加固工程中具有强度高、重量轻、耐久性能好等优点。     

纤维复合材料加固桥梁技术研究

对纤维复合材料（FRP）加固技术的技术原理、研究现状、施工工艺及要求、技术特点及适用范围进行总结。FRP加固技术具有施工便捷、不受构件形状限制、不改变截面尺寸、对原结构不产生损伤、优异的耐久性能、不增加自重、不减小净空及具有良好的适应性等优势。给出一些纤维复合材料加固技术在桥梁加固工程中的应用实例及加固思路,FRP加固可适用于桥梁工程中的抗弯加固、抗剪加固、约束加固及耐久性加固等不同加固情况。     

碳纤维材料加固桥梁结构新技术

本对该项技术的特点、使用材料、施工工艺及国内外研究开发作了介绍，同时对市场前景及存在问题做了分析。     

锚喷法加固旧桥的设计与施工

本文详细介绍了采用锚喷法加固旧桥时设计的原则和施工工艺,指出了施工中常见问题,并提出了解决措施,对工程实践有一定的指导意义。     

浅谈碳纤维在桥梁加固中的应用

随着我国经济社会的不断发展,人民生活水平的不断提高,对交通的需要越来越强烈,桥梁作为跨河、跨海、跨沟的一种有效工具,其质量也显得尤为重要。为了减轻桥梁的重量,降低桥梁的维护成本,延长桥梁的使用时间,碳纤维是一种很好的材料。下面介绍碳纤维在桥梁加固中的应用。     

玻璃纤维布在钢筋混凝土柱加固中的应用

本文结合具体的工程概况,针对钢筋混凝土柱施工强度等级不足问题,详细介绍了采用玻璃纤维布加固的方案和方法,并通过对比试验证明了方案的可行性,从而确保工程质量。     

高强复合纤维加固钢筋混凝土受弯构件的研究

分析研究了粘贴高强复合纤维加固受弯构件的受力过程，探讨了加固后钢筋混凝土梁正截面的破坏特征、受力特点以及影响因素，并提出正截面强度计算公式。试验结果表明：钢筋的配筋率与复合纤维的粘贴量对加固效果影响较大；实施桥梁构件加固时，要考虑加固前混凝土和钢筋已存的应力应变；复合玻璃纤维能有效地抑制裂缝的开展与延伸，为今后研究提供了参考。     

自平衡体系在预应力桥梁加固中的应用

针对颍河大桥的确定的加固方案,拆除原有部分结构时,引入自平衡体系,同步增加等重、设置配重以平衡主梁肋的负弯矩,防止因主梁反挠破坏或失稳。     

速生材增强处理技术研究进展及发展趋势

本文阐述了人工林速生材木材增强处理的机理、方法和国内外研究进展,分析了木材增强处理技术在产业化应用中存在的问题和未来发展趋势。     

Effect of carbon nanotube on physical and mechanical properties of natural fiber/glass fiber/cement composites

The objective of this investigation was to introduce a cement-based composite of higher quality. For this purpose new hybrid nanocomposite from bagasse fiber,glass fiber and multi-wall carbon nanotubes(MWCNTs)were manufactured. The physical and mechanical properties of the manufactured composites were measured according to standard methods. The properties of the manufactured hybrid nanocomposites were dramatically better than traditional composites. Also all the reinforced composites with carbon nanotube, glass fiber or bagasse fiber exhibited better properties rather than neat cement.The results indicated that bagasse fiber proved suitable for substitution of glass fiber as a reinforcing agent in the cement composites. The hybrid nanocomposite containing10 % glass fiber, 10 % bagasse fiber and 1.5 % MWCNTs was selected as the best compound.     

基于专利的我国竹木复合材发展分析

以国家知识产权局中国专利数据库为数据源,检索了1985—2013年我国申请的有关竹木复合材专利信息,对竹木复合材专利的年度发展趋势、申请地区、专利权人、IPC分布和重点专利技术进行定量分析。结果表明:目前,竹木复合技术处于快速成长阶段;浙江、湖南、江苏为专利技术分布的主要区域;高校、科研机构和企业都是技术研发的主力;竹木复合材专利涉及到的领域集中在B部(交通运输)、E部(固定建筑物)和A部(人类生活必需),复合技术是竹木复合材的核心技术。     

Mechanical properties of natural fiber composites produced using dynamic sheet former

ABSTRACT

Composites formed from wood fibers and man-made cellulosic fibers in PLA (polylactic acid) matrix, manufactured using sheet forming technique and hot pressing, are studied. The composites have very low density (due to high porosity) and rather good elastic modulus and tensile strength. As expected, these properties for the four types of wood fiber composites studied here improve with increasing weight fraction of fibers, even if porosity is also increasing. On the contrary, for man-made cellulosic fiber composites with circular fiber cross-section, the increasing fiber weight fraction (accompanied by increasing void content) has detrimental effect on stiffness and strength. The differences in behavior are discussed attributing them to fiber/ fiber interaction in wood fiber composites which does not happen in man-made fiber composites, and by rather weak fiber/matrix interface for man-made fibers leading to macro-crack formation in large porosity regions.     

Effects of fiber length and orientation on elasticity of fiber-reinforced plywood

Short carbon fibers, a reinforced material in wood veneer composites, were used to investigate the effects of fiber length and orientation of fibers on the elasticity of plywood. The technical feasibility, elasticity, and strength of the reinforced plywood with short carbon fiber were evaluated. In a short fiber reinforcement system, the fiber length does not directly influence the reinforcement in Cox's theory when the fiber length exceeded a certain length. When the length of short carbon fiber is beyond 3 mm, the high reinforced result was obtained in the experiment. However, if fiber length was too long, the reinforced result was less owing to the bridge between fibers and the increase of holes. The optimum fiber length must be considered. The orientation of fibers has a strong influence on the reinforcement. Unidirectional, perpendicular, and random orientation displayed different influence on the elasticity. Experimental results were discussed with Cox's method. Reinforced plywood with short carbon fibers in random orientation has a higher shear modulus and bending strength than the controls, in addition to other mechanical properties.     

MA-SEBS对木纤维/聚丙烯复合材料冲击断裂行为的影响(英文)

马来酸酐接枝苯乙烯-乙烯-丁烯-苯乙烯(MA-SEBS)用作聚丙烯/木纤维复合体系的界面相容剂及冲击改性剂,来提高其界面粘接及冲击强度。研究了MA-SEBS含量对PP/WF复合材料冲击断裂行为的影响,当MA-SEBS含量达到8%时,冲击性能达到了最大值,进一步增加到10%并未提高其断裂韧性,但动态热机械分析(DMA)表明复合材料刚性的提高,这归因于PP/WF界面的改善,当MA-SEBS超过8%,聚丙烯与木纤维分子间的相互作用增强。扫描电子显微镜(SEM)分析了样品的断裂表面,表明木纤维与聚丙烯表面强烈的界面粘结。图5表1参11。     

Effect of maleic anhydride grafted styrene-ethylene-butylene-styrene （MA-SEBS） on impact fracture behavior of polypropylene / wood fiber composites

MA-SEBS as compatibilizer and impact modifier was incorporated into Polypropylene/Wood Fiber （PP/WF） to enhance interface adhesion and impact strength of the composite. The effect of MA-SEBS content on the impact fracture behavior of PP/WF composites was studied. The impact properties of composites with 8% MA-SEBS reached the maximum value. And further increasing of MA-SEBS content to 10% did not improve the fracture toughness, but improved the stiffness of composites by DMA analysis. This was attributed to the improved PP/WF adhesion. As the MA-SEBS content is more than 8%, the molecule interaction of PP and WF was expected to much stronger than lower MA-SEBS. Scanning electron microscopy （SEM） was performed to analyze the impact fracture surface and showed a stronger affinity for the wood surfaces.     

高强度螺栓连接支架的应用

本文提出将索道支架在工厂内分段焊成 ,然后在现场用高强度螺栓分段安装的方法 ,为索道设计施工提出了一条有效方法和建议。     

木塑复合材料研究进展的刍议

简述了木塑复合材料的特点及开发术塑复合材料的意义，论述了该领域的国内外研究现状、应用前景和发展趋势。     

土包砂路基施工技术应用分析

土包砂路基是指路基的中部用砂填筑，两侧用具有一定宽度和顶面一定厚度的定塑性指数的土包围填筑而成型的路基。结合哈尔滨绕城公路东北段土包砂路基施工的现场资料，按照施工规范要求和规定，对哈尔滨绕城公路东北段土包砂路基施工技术中影响压实度因素进行了比较分析，通过分析发现：（1）随着碾压编数的增多，压实度提高不明显；（2）松铺高度对压实度有很大的影响，当松铺高度接近28em时，压实度最大；（3）压实度随着含水量的增加而增大，当达到13％时，压实度随含水量的增加趋于平稳。