Research on seismic performance of shear walls with concrete filled steel tube columns and concealed steel trusses

In order to further improve the seismic performance of RC shear walls, a new composite shear wall with concrete filled steel tube (CFT) columns and concealed steel trusses is proposed. This new shear wall is a double composite shear wall; the first composite being the use of three different force systems, CFT, steel truss and shear wall, and the second the use of two different materials, steel and concrete. Three 1/5 scaled experimental specimens: a traditional RC shear wall, a shear wall with CFT columns, and a shear wall with CFT columns and concealed steel trusses, were tested under cyclic loading and the seismic performance indices of the shear walls were comparatively analyzed. Based on the data from these experiments, a thorough elastic-plastic finite element analysis and parametric analysis of the new shear walls were carried out using ABAQUS software. The finite element results of deformation, stress distribution, and the evolution of cracks in each phase were compared with the experimental results and showed good agreement. A mechanical model was also established for calculating the load-carrying capacity of the new composite shear walls. The results show that this new type of shear wall has improved seismic performance over the other two types of shear walls tested.     

环氧树脂/沸石纳米复合材料的制备及表征

提出了一种用原位插入法制取环氧树脂/沸石纳米复合材料的新方法, 详细探讨了钠化、有机化、环氧树脂插入、固化及制备环氧树脂/沸石纳米复合材料的条件, 在实验的基础上确定了最佳条件, 制成了纳米复合材料, 并用XRD和TEM对其结构进行了表征, 发现纳米复合材料的平均粒径在5 0~ 6 0nm之间, 同时力学性能有明显提高, 可用于高性能的工程塑料和高品质的粘合剂.      

Mg2B2O5晶须增强AZ91D镁基复合材料在Cl-溶液中腐蚀行为*

用电化学方法测量了Mg_2B_2O_5晶须增强AZ91D镁基复合材料在3.5%NaCl溶液中的开路电位、动电位极化曲线和交流阻抗,研究了晶须体积分数对镁合金基体耐腐蚀性能的影响,并利用SEM和XRD表征了腐蚀后复合材料表面的微观形貌和相组成。结果表明,随着Mg_2B_2O_5晶须体积分数的增加,AZ91D镁基复合材料的耐腐蚀性逐渐提高。当硼酸镁晶须的体积分数为35%时,材料的自腐蚀电位提高0.2V以上,自腐蚀流密度降低了1个数量级;SEM测试表明,复合材料表面生成了一层晶须增韧的腐蚀钝化膜,对基体起到保护作用。     

工业CT在复合材料孔隙率分析中的应用

目的：研究应用高分辨率工业CT系统对陶瓷基复合材料的孔隙率进行分析的方法，材料和方法：采用俄罗斯INDINTRO公司的BT－50高分辨工业CT系统对陶瓷基复合材料试样进行CT扫描，用自行编制的后处理软件对得到的CT图像进行分析，得出材料的孔隙率，结果：通过此方法得出的结果与超声检测结果相符，说明用高分辨率工业CT系统测定复合材料的孔隙率是可行的，同时对材料进行缺陷检测，密度分析等。     

凹凸棒石的材料矿物学实验研究

凹凸棒石对有机物,尤其对具有极性或极性基团的有机大分子有强烈的吸附作用,其机理在于它特殊的结构所导致的表面和沸石水孔道中的电性不饱和而产生的电吸附作用。凹凸棒石可以用作高分子PEK-C复合材料的填料,经过缩醛反应对凹凸棒石表面进行改性,可改善填料与基体之间内表面的粘结,提高复合材料的杨氏模量、抗张强度和断裂伸张。     

ASE复合桩技术设计及试验研究

针对吹填淤泥的超软土工程性质,提出了ASE桩的概念,即沉管投入复合材料再原位扩径搅拌的施工技术。以固化细料+骨架粗料为超软土提供基本强度及骨架支撑的原理,参考搅拌桩与CFG桩的施工工艺,制作专用双塔型施工设备,尝试形成一种新的施工工艺。进行了现场初步试验,固化细料与骨架粗料的配合比较理想时,可形成较为理想的桩体。成桩质量主要受固化细料影响,骨架粗料的效果发挥需要依赖一定配合比基础的固化细料。先沉管投料再扩径搅拌的工艺是可行的,环刀型叶片能够实现扩径的效果,且双向扩径搅拌的效果要好于单向扩径搅拌的效果。ASE桩的设计计算方法及理论还需做进一步研究,可参考CFG桩与搅拌桩的相关理论开展工作,为地基处理技术的发展提供了新的思路。     

Structural characteristics of zeolite/TiO2 composite and photocatalysis of toluene degradation

Zeolite/TiO2 composite photocatalysts were prepared by adding a certain amount of mordenite in TiO2, and degradation experiments on toluene through photocatalytic reactions were implemented. In this paper, these photocatalysts were characterized by using SEM, IR, RAMAN, XRD and UV-Vis to shed light on the microstructure and photocatalytic performance of the composite photocatalysts. The results indicated that the structural hydroxy of zeolite can participate in bonding reaction with TiO2, the addition of zeolite can greatly reduce the diameter of nanometer TiO2 particles in the composite photocatalysts, and enhance the ultraviolet light absorptance of the composite photocatalysts. When the percentage content of zeolite reached 20%, the photocatalytic performance of this catalyst would be highest, with the toluene conversion rate up to 94.58%.     

粘土矿物的层间域调控及其应用研究

粘土矿物的层间域调控及其应用研究戴劲草黄继泰肖子敬叶玲（华侨大学材料物理化学研究所，福建泉州３６２０１１）关键词粘土矿物层间域粘土复合材料粘土矿物是一类颗粒十分细微的层状铝硅酸盐，具有较大的残缺表面，层间结合力较弱，且存在着层内结构不饱和填充与扭曲等...