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测绘地理信息的具体应用及其方法
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作者 张同 《中文科技期刊数据库(引文版)工程技术》 2023年第4期115-118,共4页
当今,随着科技的迅速发展,测绘 GIS技术也得到了极大的进展,并被广泛地运用于人们的日常工作生活之中,这既能提高测绘工作的效率,又能大大增强测绘工作的质量。目前,测绘地理信息技术已经成为了测绘行业中的核心技术,并广泛应用于城市... 当今,随着科技的迅速发展,测绘 GIS技术也得到了极大的进展,并被广泛地运用于人们的日常工作生活之中,这既能提高测绘工作的效率,又能大大增强测绘工作的质量。目前,测绘地理信息技术已经成为了测绘行业中的核心技术,并广泛应用于城市规划、土地管理、矿产资源开发等诸多领域。本文主要对测绘地理信息技术的具体应用及其方法进行了探讨和分析。 展开更多
关键词 测绘地理信息 具体应用 有关方法
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建筑工程预算及结算方法之我见
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作者 赵文霞 《经济视野》 2016年第8期105-105,共1页
建筑工程的预算与其结算之间的关系相当紧密,这两者对于整个建筑工程也有着极大的影响。在对建筑工程进行预算之前,有关人员一定要对施工作业有较为深入的了解,以防在实际的施工作业当中出现资金偏差过大现象的出现。科学合理的预算... 建筑工程的预算与其结算之间的关系相当紧密,这两者对于整个建筑工程也有着极大的影响。在对建筑工程进行预算之前,有关人员一定要对施工作业有较为深入的了解,以防在实际的施工作业当中出现资金偏差过大现象的出现。科学合理的预算将给工程的结算工作带来极大的帮助,在有关工作中,我们要对两者之间的关系进行正确的看待,以便之后工作的顺利开展。 展开更多
关键词 建筑工程预算 建筑工程结算 有关方法
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Bending behaviour of lightweight aggregate concrete-filled steel tube spatial truss beam 被引量:3
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作者 傅中秋 吉伯海 +1 位作者 朱伟 葛汉彬 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第8期2110-2117,共8页
A lightweight aggregate concrete-filled steel tube(LACFST) spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. Accor... A lightweight aggregate concrete-filled steel tube(LACFST) spatial truss beam was tested under bending load. The performance was studied by the analysis of the beam deflection and strains in its chords and webs. According to the test results, several assumptions were made to deduce the bearing capacity calculation method based on the force balance of the whole section. An optimal dimension relationship for the truss beam chords was proposed and verified by finite element analysis. Results show that the LACFST spatial truss beam failed after excessive deflection. The strain distribution agreed with Bernoulli-Euler theoretical prediction. The truss beam flexural bearing capacity calculation results matched test evidence with only a 3% difference between the two. Finite element analyses with different chord dimensions show that the ultimate bearing capacity increases as the chord dimensions increase when the chords have a diameter smaller than optimal one; otherwise, it remains almost unchanged as the chord dimensions increase. 展开更多
关键词 lightweight aggregate concrete-filled steel tube spatial truss beam bending behaviour bearing capacity
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Nonlinear finite-element-based structural system failure probability analysis methodology for gravity dams considering correlated failure modes 被引量:4
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作者 胡江 马福恒 吴素华 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第1期178-189,共12页
The structural system failure probability(SFP) is a valuable tool for evaluating the global safety level of concrete gravity dams.Traditional methods for estimating the failure probabilities are based on defined mathe... The structural system failure probability(SFP) is a valuable tool for evaluating the global safety level of concrete gravity dams.Traditional methods for estimating the failure probabilities are based on defined mathematical descriptions,namely,limit state functions of failure modes.Several problems are to be solved in the use of traditional methods for gravity dams.One is how to define the limit state function really reflecting the mechanical mechanism of the failure mode;another is how to understand the relationship among failure modes and enable the probability of the whole structure to be determined.Performing SFP analysis for a gravity dam system is a challenging task.This work proposes a novel nonlinear finite-element-based SFP analysis method for gravity dams.Firstly,reasonable nonlinear constitutive modes for dam concrete,concrete/rock interface and rock foundation are respectively introduced according to corresponding mechanical mechanisms.Meanwhile the response surface(RS) method is used to model limit state functions of main failure modes through the Monte Carlo(MC) simulation results of the dam-interface-foundation interaction finite element(FE) analysis.Secondly,a numerical SFP method is studied to compute the probabilities of several failure modes efficiently by simple matrix integration operations.Then,the nonlinear FE-based SFP analysis methodology for gravity dams considering correlated failure modes with the additional sensitivity analysis is proposed.Finally,a comprehensive computational platform for interfacing the proposed method with the open source FE code Code Aster is developed via a freely available MATLAB software tool(FERUM).This methodology is demonstrated by a case study of an existing gravity dam analysis,in which the dominant failure modes are identified,and the corresponding performance functions are established.Then,the dam failure probability of the structural system is obtained by the proposed method considering the correlation relationship of main failure modes on the basis of the mechanical mechanism analysis with the MC-FE simulations. 展开更多
关键词 gravity dam structural system failure probability nonlinear finite element response surface method computational platform
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Directivity Effect on PGV Attenuation Relationships in Silakhor Earthquake (2006, Mw6.1)
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作者 Katayoun Behzadafshar Abbas Abbaszadeh Shahri 《Journal of Civil Engineering and Architecture》 2011年第12期1117-1125,共9页
Rupture directivity effect causes spatial variation in strong ground motion parameters. It causes difference between the strike- normal (V.) and strike-parallel (Vp) components of horizontal ground motion amplitud... Rupture directivity effect causes spatial variation in strong ground motion parameters. It causes difference between the strike- normal (V.) and strike-parallel (Vp) components of horizontal ground motion amplitudes. These variations become significant for strong ground motion velocity and the authors have developed a modification to define directivity effect factor to account for the effect of rupture directivity in empirical velocity attenuation relations which are based on modeling Silakhor earthquake, using finite element method by ANSYS. The ground motion parameters that are modified include ratio of Vn/Vp component of horizontal velocity and Vn component to average horizontal velocity (V). The ratio of Vn to Vp is large in both the forward directivity direction, where velocity is larger, and in the backward directivity direction, where velocity is smaller. Therefore the authors expected that the Vn/Vp was mainly controlled by directivity angle. Also the variation of fault normal velocity to average horizontal velocity ratio by directivity angle (0) is defined from earthquake modeling. It shows Vn/V is controlled by directivity angle, distance between the site, epicenter and rupture length. This ratio has the same trend in Silakhor earthquake strong ground velocity data. In this paper the equation for Vn/Vp variations by directivity angle is recommended. The authors used Somervill et al. (1997) directivity model parameters as (R/L) cos2 ~ to define directivity effect on Vn/V ratio and therefore directivity factor is determined to account in near field empirical strong ground velocity attenuation relationships. 展开更多
关键词 DIRECTIVITY Silakhor earthquake velocity attenuation relationships
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浅谈纸质档案保管的方法
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作者 时升来 《科学中国人》 2016年第6X期105-,共1页
在全国提倡实行电子化档案的同时我们也要做好保护纸质档案的工作。电子化档案在虽然在先进程度上超过纸质档案,但确保纸质档案的完整性不仅有利于今后工作的顺利开展,更能够为各个企业和事业单位留下珍贵材料,这是电子档案无法完全替... 在全国提倡实行电子化档案的同时我们也要做好保护纸质档案的工作。电子化档案在虽然在先进程度上超过纸质档案,但确保纸质档案的完整性不仅有利于今后工作的顺利开展,更能够为各个企业和事业单位留下珍贵材料,这是电子档案无法完全替代的。由此可见纸质档案管理者的责任重大。因此,在进行纸质档案记录后将档案完善地保存起来,对我国稳定发展有着重要作用。 展开更多
关键词 纸质档案 保存管理 有关方法 简单分析
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Asymptotic Energy Expansion for Rational Power Polynomial Potentials
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作者 Asiri Nanayakkara 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第11期645-648,共4页
Asymptotic energy expansion method is extended for polynomial potentials having rational powers. New types of recurrence relations are derived for the potentials of the form rig, mN are positive integers while coeffic... Asymptotic energy expansion method is extended for polynomial potentials having rational powers. New types of recurrence relations are derived for the potentials of the form rig, mN are positive integers while coefficients bk ∈ C. As in the case of even degree polynomial potentials with integer powers, all the integrals in the expansion can be evaluated analytically in terms of F functions. With the help of two examples, we demonstrate the usefulness of these expansions in getting analytic insight into the quantum systems having rational power polynomial potentials. 展开更多
关键词 asymptotic expansion eigen energies SEMICLASSICAL
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