浅谈混凝土抗压强度试验中环箍效应对试件影响范围的确定

利用静态应变仪及分析软件在混凝土抗压强度试验时对混凝土试件产生的横向变形数据进行采集和分析,得出沿混凝土试件高度范围内,距压板越远,环箍效应对试件的影响越小,反之亦然。环箍效应对混凝土试件的影响集中在距压板范围内。     

修正的抗剪强度参数可靠度分析方法

在抗剪强度参数可靠度分析中,针对摩尔库仑强度准则方程表现出的非线性,给出了修正的可靠度分析方法.首次选取泰勒级数的部分二次项,用一个距原点最近点处拟合的超低维曲面近似极限状态面.推导了修正的可靠度计算公式,较原有的可靠分析方法(JC法),计算精度得到进一步的提高.     

超声回弹综合法检测修正的必要性分析

使用超声回弹综合法检测建筑实体混凝土强度,当混凝土构件检测值和测强曲线有较大差异时,采用钻芯修正能更真实地反映建筑实体质量。     

对主成分分析在搅拌桩质量检测的评判研究

简述了桩身质量检测的常用方法及评判标准,采用主成分分析原理与关联度分析原理,结合搅拌桩检测资料,对影响桩身质量的因素进行了分析研究,得出了一些有价值的结论,对搅拌桩检测方法及评判标准的改进与完善具有参考意义.     

重载包装木箱端板结构分析

比较重载包装木箱端板的原有设计与加入斜挡的改进设计的端板结构受力分析,通过计算,改进后的端板结构端梁抗弯强度提高12倍,端面角立柱的抗压强度提高3倍,有效提高了重载包装木箱承载能力.     

Effect of particle size distribution on green properties during high velocity compaction

Iron powders with two different particle size distributions were compacted by high velocity compaction. The influences of particle size distribution and impact velocity on green properties, including green density, springback, tensile strength and bending strength etc., were studied with scanning electron microscopy (SEM) and a computer controlled universal testing machine. The results show that the particle size distribution and the impact velocity strongly affect its properties. Wider size distribution results in green compact with higher density and better strength. Furthermore, springback of compacts is lower produced by the powder with wider size distribution, especially for radial springback. As impact velocity increases, its green density and green strength gradually increases, but the increasing rate of density decreases gradually. No special relation is found between springback and impact velocity. In addition, the axial springback and the bending strength are higher than the radial springback and the tensile strength, respectively.     

复合包装材料剥离强度的检测方法

本文介绍了包装复合材料的分类、包装复合包装材料剥离强度的定义、检测方法及注意事项。     

Application of material strength reserve method to the stability analysis of earth dam of feilaixia multipurpose project

The material strength reserve method is practical in the study of the stability and failure mechanism of earth dam by analysing the development of failure zone of different shear strength parameters of the earth mass of the dam. The stability in the concrete dam and ensemble architecture has got general application while analysing. In combination with Feilaixia Multipurpose Project, application of this method to earth dam stability analysis was studied by plane Finite Element Method（FEM） for the first time. Through plane FEM, we can get the failure mechanism of earth dam and appraise to the security, for operating and managing put forward some reference suggestions.