Strengthening an in-service reinforcement concrete bridge with prestressed CFRP bars

Carbon fiber reinforced polymer(CFRP)bars were prestressed for the structural strengthening of 8 T-shaped rein-forced concrete (RC)beams of a 21-year-old bridge in China.The ultimate bearing capacity of the existing bridge after retrofit was discussed on the basis of concrete structures theory.The flexural strengths of RC beams strengthened with CFRP bars were controlled by the failure of concrete in compression and a prestressing method was applied in the retrofit.The field construction processes of strengthening with CFRP bars-including grouting cracks,cutting groove,grouting epoxy and embedding CFRP bars,surface treating,banding with the U-type CFRP sheets,releasing external prestressed steel tendons-were introduced in detail.In order to evaluate the effectiveness of this strengthening method,field tests using vehicles as live load were applied before and after the retrofit.The test results of deflection and concrete strain of the T-shaped beams with and without strengthening show that the capacity of the repaired bridge,including the bending strength and stiffness,is enhanced.The measurements of crack width also indicate that this strengthening method can enhance the durability of bridges.Therefore,the proposed strengthening technology is feasible and effective.     

高分子专业课程设计的教学探究

针对以往高分子专业课程设计教学过程中存在的时间紧迫、学生理解不透、考核不严等问题,进行了教学改革探索,实施了提前准备、模型教学、多媒体讲解、答辩考核等方面的教学改革,有效地提高了课程设计的教学质量。     

促蛋白复性高分子及其作用机制

概述近年来蛋白复性中所使用的高分子添加剂及各自的作用机制,为相关领域的研究者对促蛋白用高分子的选择以及新型材料的研制,提供一定的研究基础和理论依据.     

2-(4-羧基苯基)-苯并咪唑和铜(Ⅱ)二元配位聚合物的合成及晶体结构

采用溶剂挥发法,选择2-(4-羧基苯基)苯并咪唑为有机配体成功地合成了一种三维层状结构的铜(Ⅱ)配位聚合物,通过X射线单晶衍射仪对结构进行了表征,结果表明,该配合物属于单斜晶系,空间群P21/c,晶胞参数a=0.9939(2)nm,b/=1.0633(2)nm,c=1.5193(3)nm,α=90.00°,β=92.719(4)°,γ=90.00°,Z=2.中心铜原子通过2-(4-羧基苯基)-苯并咪唑配体的两个氧原子和两个氮原子形成平行四边形的配位环境.     

茶碱分子印迹PDVB/PAAIPN的合成及其吸附性能

将工业丙烯酸和致孔剂溶胀到聚二乙烯基苯树脂球中,通过悬浮聚合合成了茶碱分子印迹和非分子印迹的大孔聚二乙烯基苯/聚丙烯酸互穿聚合物网络(PDVB/PAA 1PN)珠体,测定了两种IPN的结构及其对茶碱的吸附性能.结果表明,两种IPN的物理和化学结构相近,但分子印迹IPN对印迹分子具有较好吸附作用,从而实现了以较简单的方法合成分子印迹效果好的大孔交联聚合物.     

Strengthening an in-service reinforcement concrete bridge with prestressed CFRP bar

Carbon fiber reinforced polymer （CFRP） bars were prestressed for the structural strengthening of 8 T-shaped reinforced concrete （RC） beams of a 21-year-old bridge in China. The ultimate bearing capacity of the existing bridge after retrofit was discussed on the basis of concrete structures theory. The flexural strengths of RC beams strengthened with CFRP bars were controlled by the failure of concrete in compression and a prestressing method was applied in the retrofit. The field construction processes of strengthening with CFRP bars including grouting cracks, cutting groove, grouting epoxy and embedding CFRP bars, surface treating, banding with the U-type CFRP sheets, releasing external prestressed steel tendons-were introduced in detail. In order to evaluate the effectiveness of this strengthening method, field tests using vehicles as live load were applied before and after the retrofit. The test results of deflection and concrete strain of the T-shaped beams with and without strengthening show that the capacity of the repaired bridge, including the bending strength and stiffness, is enhanced. The measurements of crack width also indicate that this strengthening method can enhance the durability of bridges. Therefore, the proposed strengthening technology is feasible and effective.     

酰胺型杯[6]芳烃聚合物合成及阳离子吸附性能

通过杯[6]芳烃六乙酸乙酯与多乙烯多胺进行氨解反应,合成了系列酰胺型杯[6]芳烃聚合物,它们对软金属离子具有较高的吸附容量,其吸附能力与聚合物中杯芳烃的含量成正比,在吸附过程中杯芳烃单元起决定性作用．     

分子印迹技术的原理与应用进展

介绍分子印迹技术的原理以及分子印迹聚合物制备的基本方法,并对其在色谱分析、传感器、抗体和受体模拟物以及模拟酶催化方面的应用进行了综述,对该领域未来的发展方向作出展望.     

《天然高分子材料》实施课程思政教学的探索

新形势下,对大学生开展思想政治教育的要求也在变化,其中对专业课程实施课程思政教学正在逐渐成为高校教育工作者的共识。《天然高分子材料》课程的重要性日益凸显,且蕴含丰富的思政元素,非常适合进行课程思政教学。该课程的专业课教师应当深入发掘其中蕴含的思政元素,并不断创新教学方法,才能更好地对《天然高分子材料》开展课程思政教学。     

稀土高分子发光材料研究的现状和展望

介绍了稀土高分子发光材料的发光原理和基本类型，重点介绍了光致发光和电致发光稀土高分子材料，阐述了稀土高分子材料研究的发展历程和现状，分析了各种稀土高分子发光材料研究的可能发展方向和应用前景。