Subjects: Mechanics >> Solid Mechanics submitted time 2024-04-19 Cooperative journals: 《应用力学学报》
Abstract：
The autoclaved aerated concrete block developed by desert sand is a new type of masonry material.A pseudo-static test considering the different vertical compressive stresses and constraints of structural columns is carried out on four pieces of desert sand wall made of autoclaved aerated concrete block in order to study the application of this new block in village buildings.The failure characteristics i.e.,force-displacement curve,skeleton curve,stiffness degradation curve and ductility of the four walls under low cyclic loading arecompared and analyzed. The test results show:1)The wall is mainly shear failure.The main crack of the wall without structural columns runs through the entire wall is about 45°,and the main crack of the wall with structural columns is in the shape of “inverted eight”.And when the vertical compressive stress increases,the seismic capacity of the wall increases,the lateral stiffness improves,but the ductility decreases. 2)Under the same vertical compressive stress,comparative analysis shows that the ultimate bearing capacity of the wall with structural columns is increased by about 2.22 times that of plain wall,ductility increased by about 60%,and the stiffness is also improved. 3)Based on the principal tensile stress theory and Coulomb failure theory,the calculation formulas for the seismic bearing capacity of the new block wall are established, and the calculation formula of seismic bearing capacity established by Coulomb failure theory is more reasonable in application. 4)The skeleton curve of the established restoring force model can reflect the experimental characteristics of the desert sand autoclaved aerated concrete block wall well.
Subjects: Materials Science >> Materials Science (General) submitted time 2017-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract：管网腐蚀问题是影响供水管网安全输配的最重要问题之一。管材的腐蚀与管网微生物生命活动密切相关。大量研究表明管壁表面普遍存在的生物膜是影响水相，生物膜与管材基质界面腐蚀作用的关键因素。深入分析生物膜微环境的结构、成分、微生物群落结构的动态变化规律是揭示管网腐蚀机理和防护管网腐蚀的重要手段。本文简介了近些年在生物膜微环境分析领域迅速发展的显微镜观测技术，表面分析技术和微电极技术，分析对比多种技术的优势和不足，简要介绍其在腐蚀研究中的应用，并探讨了生物膜微环境分析技术在供水管网腐蚀问题中的研究方向。
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