基于正交试验分析影响透水混凝土性能的主要因素

透水混凝土作为一种环保型材料,在水利工程和道路工程等方面得到越来越广泛的应用。影响其性能的主要因素有：水灰比、骨灰比和骨料粒径。采用正交试验方法[L9（3^4）],以28d抗压强度和透水系数为性能指标,分析研究了3个因素及其不同的水平对透水混凝土性能的影响,并通过回归分析和极差方差分析确定抗压强度和透水系数影响因素的显著性大小,得出了骨料粒径和骨灰比对透水混凝土性能的影响较为显著,水灰比影响较小的结论。     

简述钢管混凝土

介绍了钢管混凝土结构的特点、研究现状及其工程应用。     

Correlation Analysis on the Fineness and Single Fiber Strength of Alpaca Wool Fiber

In this study,321 samples were tested to evaluate the correlation between fineness and single fiber strength of alpaca fiber. The results showed that fineness average of lateral part was 24.30 μm,subject range was from 18.01 to 27.00 μm,accounted for 72% of the total samples;The strength average was 8.31 cN,subject range was from 5.01 to 11.00 cN, accounted for 88% of the total samples, it showed that the overall fineness of alpaca wool fiber was fine,the strength could satisfy the textile technology. The correlation results showed that the fineness of different parts (neck, shoulder, thigh, abdomen, lateral and back) in different groups (sex, age) all reflected that the wool fiber of the back was the finest,the strength was the minimal;And that of abdomen was the thickest,the strength was the maximum. On the other hand, we knew the greater the strength, the fineness was thicker; The smaller the strength, the fineness was finer from the distribution of different fineness range corresponded to the strength. In addition, there was also a positive correlation between them in differernt groups (sex,age),the fineness of adult alpaca was thicker than yearling alpaca, the male alpaca was thicker than female alpaca; The strength of adult alpaca was stronger than yearling alpaca, the male alpaca was stronger than female alpaca. The above results showed that the fineness of alpaca wool fiber was positively correlated with the single fiber strength.     

Experimental Study on Shear Strength of High Strength Concrete Columns

On basis of the experiment on sixteen high strength concrete columns, their shear behaviors are analysed. The effects of shear-span ratio and axial compression ratio on failure behavior, cracking shear and shear strength are analysed. The authors have discussed the suitability of the design equations for shear strength in the code. This experimental study on shear strength of high strength concrete frame columns is the first one in this field at home and the results can be served as reference for the code of high strength concrete design.     

Wolf公式在乳品礼盒箱结构设计中的应用

为研究Wolf公式在乳品礼盒箱结构设计中的应用,以350 mL莫斯利安为例,根据内装物的数量、排列方式预设计5种礼盒箱,依据Wolf公式对各规格礼盒箱进行理论抗压计算,并运用抗压公式对相同贮存环境中、堆码10层的条件下计算礼盒箱最低应达到的抗压值,综合长宽比、周边长等礼盒结构设计元素对二者的结果进行了比较和分析研究,同时对礼盒箱进行抗压实验验证,进而得出最适合350 mL莫斯利安结构设计的礼盒箱.结果表明:350 mI礼盒箱在纸箱材质、高度一致的条件下,排列为3×3、长宽比为1、周边长为74 mm时,礼盒箱4的抗压强度提供的市场价值最优.     

Experiment Research of Adhesive and Shearing Strength between the Concrete Member Poured with Special-shaped Steel Form and the Cement Mortar on its Surface

This paper systematically presents the experiment about the adhesive and shearing strengthbetween the concrete member poured with two kinds of steel form and the cement mortar on the membersurface. By the comparison of three groups of experiments, this paper draws a conlusion tha the adhesive and shearing strentgh between concrete member and cement mortar could be considerably increased if the special-shaped steel form was applied.     

测试胶合板胶合强度的研究

通过对有关胶合强度测试的几个试验结果的分析,表明我国胶合板国家标准对胶合强度试验方法的规定具有先进性、合理性和可行性。