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针对GIS平台难以共享图形软件符号的问题,该文以AI符号为研究对象,提出了GIS共享AI图形系统点状符号方法。通过研究两类系统地图符号模型差异,分析AI图形符号与基于路径的点状符号结构,对比两类符号模型的几何结构与样式类型,验证了基于路径点状符号结构的通用性;通过设计AI图形符号数据向基于路径点状符号数据的映射方法,提出了GIS共享AI图形系统点状符号方法,实现了GIS平台对AI图形系统符号的共享。实验结果表明,利用基于路径的点状符号能够共享存在于AI图形软件的图形符号,实现GIS平台共享图形符号资源。 相似文献
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西北地区古代生土建筑物冻融风蚀机理的实验研究 总被引：11，自引：0，他引：11
西北地区独特的旱寒条件, 一方面使古代生土建筑物得以建筑和保存, 另一方面, 强烈的冻融风蚀作用致使许多生土建筑坍塌殆尽, 导致这一不可再生资源的破坏. 通过对古代生土建筑物冻融风蚀的模拟实验, 研究发现, 冻融风蚀是古代生土建筑物毁坏的主要因素. 当冻融次数相同, 随含水量增加, 风蚀强度增大, 尤其是当含水量相同条件下, 随冻融次数的增加, 风蚀量显著增大. 因此, 反复冻融循环作用所引起的土体微结构破坏是古代生土建筑物毁坏的主要原因, 而风蚀又是其主要动力机制. 风洞模拟实验结果表明 , 5%LS和10%PS耐冻材料具有良好的抗蚀性, 因此, 在自然条件严酷的西北地区, 采用该防护材料是对古代生土建筑物进行科学保护的一种重要途径. 相似文献
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Analysis of the in‐plane response of earthen masonry infill panels partitioned by sliding joints 
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下载免费PDF全文 Marco Preti Nicola Bettini Laura Migliorati Valentino Bolis Andreas Stavridis Giovanni A. Plizzari 《地震工程与结构动力学》2016,45(8):1209-1232
The vulnerability of infilled frames represents a critical issue in many regions with high seismicity around the world where infills are typically made of heavy masonry as they are used for thermal control of the buildings because of their thermal inertia. In this context, the use of earthen masonry infills can give a superior performance because of their ability to regulate thermal‐hygrometric performance of the building and sustainability of its life‐cycle. This paper presents a numerical study on the seismic behaviour of infill walls made of earthen masonry and partitioned with horizontal wooden planks that allow the relative sliding of the partitions. The combination of the deformability of earthen masonry and the sliding mechanism occurring along the wooden planks gives a high ductility capacity to the in‐plane response of the infill and, at the same time, significantly reduces its stiffness and strength, as compared with traditional solid infills made of fired clay units. As a result, the detrimental interaction with the frame and the damage in the infill when subjected to in‐plane loading can be minimized. The numerical model is validated with results from an experimental study and is used to perform a parametric analysis to examine the influence of variations in the geometry and mechanical properties of the infill walls, as well as the configuration of the sliding joints. Based on the findings of this study, design guidelines for practical applications are provided, together with simple formulation for evaluating their performance. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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针对我国村镇地区仍广泛存在生土结构房屋,且其结构整体性及抗震性能较差的现状,提出一种可有效提高其抗震性能、具有施工便捷性和装配属性的新型钢节点木构架-生土墙结构形式。进行了新型钢节点木构架-生土墙与农房中常见的素生土墙、上土坯下砖砌体混砌墙、传统榫接木构架-生土墙的拟静力对比试验,比较了4个墙体试件的破坏形态、滞回曲线和骨架曲线特征,以及延性系数、耗能能力、极限层间位移角等抗震性能指标。研究表明:素生土墙和上土坯下砖砌体混砌墙抗震性能较差,木构架的约束作用可有效提升生土墙的抗剪承载力和延性,新型钢节点连接的木构架-生土墙抗震性能优于榫接形式,具备一定的推广应用价值。 相似文献
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This paper presents the results of an experimental work in order to evaluate the performance of a novel proposed retrofitting technique on a typical dome‐roof adobe building by shaking table tests. For this purpose, two specimens, scaled 2:3, were subjected to a total of nine shaking table tests. The unretrofitted specimen, constructed by common practice, is designed to evaluate seismic performance and vulnerability of dome‐roof adobe houses. The retrofitted specimen, exactly duplicating the first specimen, is retrofitted based on the results obtained from unretrofitted specimen tests, and the improvement in seismic behavior of the structure is investigated. Zarand earthquake (2005) Chatrood Station is selected as the input ground motion that was applied consecutively at 25, 100, 125, 150 and 175% of the design‐level excitation. At 125% excitation level, the roof of the unretofitted specimen collapsed due to the walls' out‐of‐plane action and imbalanced forces. The retrofitting elements consist of eight horizontal steel rods drilled into the walls, passed through the specimen and bolted on the opposite wall surfaces. To improve walls in‐plane seismic performance, welded steel mesh without using mortar, covered less than half area of walls on the external face of the walls, is used. In addition to strain gauges for recording steel rod responses, several instrumentations including acceleration and displacement transducers are implemented to capture response time histories of different parts of the specimens. The corresponding full‐scaled retrofitted prototype tolerated peak acceleration of 0.62 g almost without any serious damage. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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敦煌莫高窟古代生土建筑物风蚀机理与防护对策的研究* 总被引：1，自引：1，他引：1
利用低温冻融实验和风洞模拟实验研究古代生土建筑的风蚀机理,结果表明:挟沙风风蚀速率明显大于净风的风蚀速率,其风蚀率是净风的130倍,冻融是风蚀速率增大的一个重要因素,偏西风的降水和风蚀是造成莫高窟古代生土建筑风蚀毁坏的方要原因.实验表明,采取5%LS和10%PS防护材料是防止风蚀的一条重要途径. 相似文献
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