大地网三类设计的应变分析法     

隋立芬 《测绘学院学报》1992,(3)

本文针对大地网三类设计的质量标准问题,提出了一种新方法:应变分析法。它可以根据区域性的尺度、旋转、变形三个应变参数的变化,来发现网的局部区域性系统差或粗差;并能较明晰地反映出新增观测值对原网的局部改进或细节改进。  相似文献   

3-D shell analysis of cylindrical underground structures under seismic shear (S) wave action   总被引：1，自引：1，他引：1  

George P. Kouretzis  George D. Bouckovalas  Charis J. Gantes 《Soil Dynamics and Earthquake Engineering》2006,26(10):909-921

The 3-D shell theory is employed in order to provide a new perspective to earthquake-induced strains in long cylindrical underground structures, when soil-structure interaction can be ignored. In this way, it is possible to derive analytical expressions for the distribution along the cross-section of axial, hoop and shear strains and also proceed to their consistent superposition in order to obtain the corresponding principal and von Mises strains. The resulting analytical solutions are verified against the results of 3-D dynamic FEM analyses. Seismic design strains are consequently established after optimization of the analytical solutions against the random angles which define the direction of wave propagation relative to the longitudinal structure axis, the direction of particle motion and the location on the structure cross-section. The basic approach is demonstrated herein for harmonic shear (S) waves with plane front, propagating in a homogeneous half-space or in a two layer profile, where soft soil overlays the bedrock.  相似文献   

地下水浮力对建筑工程设计施工的影响     

朱宝宏 《云南地质》2006,25(1):76-79

地下水的浮力对结构设计和施工有不容忽视的影响。结构抗浮验算与地下水的性状、水压力和浮力、地下水位变化及意外补水有关。提出设计水位计算浮力的概念，以及抗浮设计的方案及措施。  相似文献   

土体原位测试法在岩土工程中的应用     

尹康华 《云南地质》2006,25(1):96-99

土体原位测试是工程勘察和检测的有效手段，通过统计其数据可以得出有效的经验公式，在工程中有一定的实用性。  相似文献   

A comparative study of the design spectra defined by Eurocode 8, UBC, IBC and Turkish Earthquake Code on R/C sample buildings     

Adem Doğangün  Ramazan Livaoğlu 《Journal of Seismology》2006,10(3):335-351

Earthquake codes have been revised and updated depending on the improvements in the representation of ground motions, soils and structures. These revisions have been more frequently seen in recent years. One of the key changes in earthquake codes has been performed on the design spectra. In this paper, the design spectra recommended by Turkish Earthquake Code and three other well known codes (Uniform Building Code, Eurocode 8, and International Building Code) are considered for comparison. The main purpose of this study is to investigate the differences caused by the use of different codes in the dynamic analysis and seismic verification of given types of buildings located at code defined different sites. The differences in expressions and some important points for elastic and inelastic spectra defined by the codes are briefly illustrated in tables and figures. Periods, base shears, lateral displacements and interstory drifts for the analyzed buildings located at code defined ground type are comparatively presented.  相似文献   

Site Response and Earthquake Design Spectra for Central Khartoum, Sudan     

Y. E-A. Mohamedzein  J. A. Abdalla  A. Abdelwahab 《Bulletin of Earthquake Engineering》2006,4(3):277-293

Khartoum, the capital of Sudan, is located at the confluence of White and Blue Niles. The city is heavily populated. Central Khartoum with its high-rise buildings is the center of governmental and business activities and is located on a strip adjacent to the Blue Nile. Geological and geotechnical data indicate that the subsoil conditions at Central Khartoum are characterized by alluvial deposits underlain by Nubian Sandstone at a depth of 25 m. The alluvial deposits, locally known as Gezira formations, consist of clays grading into silt and sand with depth. Macro seismic zonation of Sudan and its vicinities, developed by the authors, gave the ground acceleration at the bedrock surface. The effect of alluvial deposits in Central Khartoum on propagation of seismic motion parameters to the ground surface is investigated in this study. Correlations are proposed for pertinent cyclic soil properties such as shear modulus, damping, and shear wave velocity. The Equivalent-Linear Earthquake Response Analyses (EERA) Model was used to study the effect of local soil conditions on ground-motion parameters. In the absence of strong-motion records in Khartoum, available worldwide strong-motion records are used. Plots showing the time histories of ground motion parameters at the ground surface are obtained. The results indicate amplification of ground motion of up to 4.93. The predicted fundamental period of soils is about 0.5 s which is typical for these types of soils. The maximum spectral acceleration varied from 0.76 to 0.95 g. For design purposes, a response spectrum curve is proposed.  相似文献   

欧美的小规模建筑设计事务所     

卫更太 《中国勘察设计》2006,(4):28-30

2006年是我国承诺对WTO成员国实行全面开放的最后一年。为提升竞争力，国内上万家中小型建筑设计单位面临着改制的任务。未来的设计机构应以什么模式为主导，值得大家探讨。本文提供欧美一些小规模设计事务所的运作模式和经营状况，供参考。  相似文献   

夏热冬暖地区建筑节能设计分析     

丘建明 《中国勘察设计》2006,(5):22-25

本文根据夏热冬暖地区的气候特点，针对目前建筑节能设计存在的薄弱环节，分析了建筑围护结构的构造措施及其热工性能，提出在节能设计中应注意的问题。  相似文献   

基于融媒体技术的地震专业知识服务系统设计与应用     

崔满丰  张晋辉 《震灾防御技术》2020,15(4):828-835

基于融媒体技术的地震专业知识服务系统是服务社会工程科技、地震及相关行业的专业信息平台，具有信息集成、科学技术创新、集管理与决策于一体的特点。本文论述了该服务系统的设计模式特点、服务内容及对象、系统技术架构和功能，并对其未来应用及发展方向进行讨论。  相似文献   

监测网顾及灵敏度准则的解析二类设计     

周世健  陈永奇 《测绘工程》1998,7(3):23-28,33

变形体的变形模式确定的情况下,应用灵敏度准则进行监测网的设计;根据Ｔａｙｏｒ展式,导出了监测网顾及灵敏度准则的二类设计模型,并对其解算及模拟算例加以说明。  相似文献