形状记忆合金丝加固古塔墙体抗震性能试验研究

针对砖石古塔墙体抗震性能差的问题,提出采用形状记忆合金丝(SMA丝)对古塔墙体进行抗震加固的新技术.为研究其加固效果,对SMA丝进行了力学性能测试,分析应变幅值对其耗能的影响,并通过SMA丝加卸载训练使其保持稳定的完全超弹性状态;通过2片SMA丝加固古塔墙体模型(1片完好墙体和1片损伤墙体)和1片未加固古塔墙体模型的拟...     

浅谈冷却塔塔体结构的分类与特点

在水资源和环境问题日益突出的今天,在工农业生产和人民生活中广泛应用的冷却设备——冷却塔对于节省水资源和保护环境发挥了重要的作用.从冷却塔塔体结构材料的角度对不同塔体结构的特点进行了阐述和分析,并对其进行了比较,以供在冷却塔选型、设计时参考.     

Effect of shear deformation on interfacial stresses in plated beams subjected to arbitrary loading

Bonding a fibre reinforced polymer (FRP) composite or metallic plate to the soffit of a reinforced concrete (RC), timber or metallic beam can significantly increase its strength and other aspects of structural performance. These hybrid beams are often found to fail due to premature debonding of the plate from the original beam in a brittle manner. This has led to the development of many analytical solutions over the last two decades to quantify the interfacial shear and normal stresses between the adherends. The adherends are subjected to axial, bending and shear deformations. However, most analytical solutions have neglected the influence of shear deformation of the adherends. For the few solutions which consider this effect in an approximate manner, their applicability is limited to one or two specific load cases. This paper presents a general analytical solution for the interfacial stresses in plated beams under an arbitrary loading with the shear deformation of the adherends duly considered. The shear stress distribution is assumed to be parabolic through the depth of the adherends in predicting the interfacial shear stress and Timoshenko's beam theory is adopted in predicting interfacial normal stress to account for the shear deformation. The solution is applicable to a beam of arbitrary prismatic cross-section bonded symmetrically or asymmetrically with a thin or thick plate, both having linear elastic material properties. The effect of shear deformation is illustrated through an example beam. The influence of material and geometric parameters of the adherends and adhesive on the interfacial stress concentrations at the plate end is discussed.     

硼酸测定中强化试剂效果比较

考察了几种不同的多元醇作为强化试剂,对硼酸强化后进行对比测试,从中筛选出较为合适的强化试剂和合理的用量,结果表明,几种多元醇均可很好地强化硼酸,滴定终点颜色变化灵敏,结果准确,该方法操作简单、快速、测定重现性好,获得了满意的结果,为拓宽硼酸测定的方法提供了可靠的理论依据.     

FRP梁结构的工程设计

本文提出了梁受到弯曲、剪切载荷时其挠度、应力应变以及局部和整体屈曲载荷、失效载荷的简单的设计公式.并用试验对其精确度和正确性进行了验证.     

玻璃钢管在核电站淡水输水工程中的应用

本文阐述了玻璃钢管在淡水输水工程中球墨铸铁管相比有比较明显的技术及经济优势，以及安装施工中应重视的几个问题。     

PAM·FRP供液管汇的研制及其应用

本文介绍了PAM·FRP供液管汇的研制过程及其在油田注聚合物工程中的应用。     

高压玻璃钢管道的研制及在油田中的应用

本文介绍了高压玻璃钢管道的特性及在我国油田的应用情况。     

聚丙烯酰胺系纸张干强剂的研究进展

本文就近几十年来聚丙烯酰胺系纸张干强剂的品种、合成方法、应用及发展趋势作一综述，同时讨论各种不同类型聚丙烯酰胺的性能指标、增强机理和其效果。     

纳米碳酸钙粒子增韧增强不饱和树脂的研究

报道了纳米级碳酸钙填充不饱和树脂的性能研究，探讨了碳酸钙含量和钛酸酯偶联处理对不饱和树脂性能的影响，用扫描电镜（SEM）观察了试样的断裂口形貌，结果表明，用偶联剂处理的纳米碳酸钙粒子含量在4份左右时对复合材料的综合性能最佳，比未加纳米粒子的和未处理的材料冲击强度分别提高了370％和170％，拉伸强度分别提高了170％和150％，SEM分析说明未处理粒子增韧不饱和树脂的机理是粒子的“钉扎”效应和钝化裂纹，而偶联剂处理的纳米粒子增韧不饱和树脂的机理主要是料子导致基体产生了塑性变形。