共查询到20条相似文献，搜索用时 15 毫秒
1.
Zhang Deshan 《保鲜与加工》1988,(2)
This paper suggests a calculation formula for eccentrically loaded brickwork or column with biaxial bending in terms of ultimate strength design method. The coefficients of the formula, are compiled as design charts so that the formula can be directly used for design of this kind of structural members. 相似文献
2.
Mao Zhengxiang 《保鲜与加工》1991,(1)
The desending lifclinc is a new type of lifesaving device used in high buildings.Based on the principlc of opcration and structure,the mathematical model for the optimum design of one-stage desending lifeline is cstablished in this paper.A practical de-riga example is calculated with a mcthod of discrete variablc optimum design.Some prob-lems in design arc discussed briefly. 相似文献
3.
Liu Longquan Liu Dong Dept.of Civil EngineeringChen Chunyi Chongqing Logistic Engineering Institute 《保鲜与加工》1992,(2)
In this paper,a beam-column design problem is formu-lated into an optimization problem The modern optimization technique,sequential unconstrained minimization technique(SUMT),is used toselect the design vesiables at points.The optimum designs obtained arereasonable and verifiable.This procedure may be used in the design ofbeam-columns.Considerable savings can be achieved due to the effectiveuse of material through the best proportion of the shape of beamcolumns. 相似文献
4.
In this paper,the structure of assembly foundation oferosion protection,its design and construction procedure are studied.Itis the development of double wall steel open caisson and reinforcedconcrete open caisson.Based on the data collected in tests,some difficultproblems about the principle of expanding foundation erosion prote-ction in deep water and construction methods are resolved.Comparedwith other foundations,the assembly foundation narated in this papercan decrease the time limit and construction cost of a project.Themethod may de better for solving the problem of bridge foundation indeep water. 相似文献
5.
Wang Hongtu Xian Xuefu 《保鲜与加工》1988,(5)
This paper is aimed at investigating the acoustic properties of rock mass under the three-dimentional different stress states, and is presented to discuss emphatically the characteristics of the acoustic wave propagation and the stress-velocity relation in both rocks (sandstone and limestone) under uniaxial and true triaxial compression. The results indicate three regions in which the acoustic velocities and the strains change with the stresses are approximately similar under different stress states; and the acoustic velocity-stress relations for elastic rocks may be represented by different interdependence coefficients under uniaxial compression. At a time, The acoustic measurement method of rock mass stresses and the horizontal tectonic stress are discussed. 相似文献
6.
This paper introduces synthetically that the grade standard and relative indexes of hotel architecture formulation after 1978 in our country. As compared with the standard of hotel design of foreign country and measuring the practices of hotel building of late years in our country,the paper discusses the suitability of standard and indexes hotel design and consummates them further still for our country. 相似文献
7.
Chen Zhonglin 《保鲜与加工》1988,(1)
Starting from the optical factors of Climate and on the basis of CIE formulasof brightness distribution for clear and overcast sky,this paper suggests a kindof formula which can be used to compute brightness distribution on average skybrightness.Besides,it proposes a simple method by which it is easy to carryout the design of natural lighting under the condition of average sky brightnessmodel. 相似文献
8.
从储粮生态系统控制的角度阐述了粮仓保温隔热性能的重要性和实用性,突出粮仓设计和使用的协调统一;针对新建粮食储备房式仓使用中多数出现仓顶隔热性差、门窗洞口气密性差、仓内粮面温度过高的问题,结合实践经验,对房式仓朝南墙面门窗的设计、保温隔热屋面的设计、仓内地坪适当下挖装粮的设计等进行了探讨,提出了实用性设计方法和"半地下储粮房式仓"新仓型的设计思路. 相似文献
9.
Kuang Ping 《保鲜与加工》1993,(2)
The urbanizing environmental diruption seriously results from ignoring ecological factors by planners and designers. This paper discusses the important functions of ecological factors for improving the urban environment through ecological landscape design,and prensents the basic ecdogical principle of urban landscape design for the urban environment. 相似文献
10.
In this paper, it is pointed out that some kind of mixed pattern for knowledge representation should be needed in CAD systems, and prototype is just one of this kind of pattern, which is most suitable to representing the relative design knowledge.The paper particularly elaborates the notion of prototype and introduces how to represent a design prototype.Operations on prototypes are also demonstrated in order to conceive the reasoning mechanism in a prototype-based design system. 相似文献
11.
Wang Caihua Wang Chengliang 《保鲜与加工》1990,(6):9-18
In this paper the section sizes of box expansion arm of crane truck are optimized in order that the weight of the arm will be the lightest on conditions that strength, rigidity, stability and size constraints are satisfactory. The fuzzy factors which influence design and the fuzziness of constraint conditions are considered. The unsymmetry mode of fuzzy optimization is established and solved by the method of optimal level cut set. Examples show that the effect is notable. 相似文献
12.
Zhang Peiyuan Yan Bo 《保鲜与加工》1989,(6):15-20
With the background of composite materials, this paper approaches the theory of the equivalencn heat conduction coefficients in multiphase solids and the method that concerns weth the prediction formula for design. The equivalence heat conduction coefficients of fiber reinforced and hollow sphere filled composite materials would be particularly proposed. 相似文献
13.
In this paper, the superposition and compensation theorems are employed to calculate the electric values under the unsymmetrical open conductor states in the three-phase power systems without modifying the bus admittance or the impedance matrices of the original networks. In cotrast with conventional algorithms, the method proposed here is highly accurate, fast, convenient and flexible. It can be applied to the unsymmetrical open conductor calculations which offered in power systems for its design and operation, to determine the settings of relay and automatic deyices, as well as accident analysis. 相似文献
14.
WANG Xue-song 《保鲜与加工》2004,(2):13-17
Introduced by a seminar about minimalism in art and architecture, and based on the comparative research under multi-dimension, in this paper, the genesis of minimalism in architecture is retraced, its design principles are deeply explored and its design features as well as inspirations for architecture design in China are summarized through some cases study related to minimalism. At the end, it points out that the minimalism in architecture is a feasible way in the multi-direction architecture designs. 相似文献
15.
Wang Bingle Zhou Shouguang Song Liquan Yu Zhigang Dept.of Mechanical Electrical Engineering 《保鲜与加工》1992,(1)
This paper is one of the achievements of the researchitem for computer-aided design of tower crane's steel structure.In thepaper,taking the well-base structure as an example,first the method establishing the mechanical model is explained for the base structure ofa movable tower crane.Then the math model of its optimal design andthe N-S figures for the computer program is described and calculatedusing discrete optimal technology.Finally the problems related to thedesign for the base structure of a movable tower crane are briefly illu-strated. 相似文献
16.
Li Shirong 《保鲜与加工》1993,(1)
This paper discusses the evaluation method of building design plan with the view of systematization and presents factors concerning building design plan. According to characteristics of multifactor, multipurpose, multifunction and multi-administrative levels in building design system, this comprehensive evaluation method provides a scientific basis for policymakers. 相似文献
17.
Aiming at the problem of machining quenched internal helical gears, a method and its equipment are discussed and designed, which is used for machining quenched internal helical gears by EDM. Its characteristic and principle are proposed. The modifying design of the electrode gear and the calculating method of its modification coefficients is presented. Analyzing for the error of the machining equipment is done. The results show that this problem can be solved by EDM, the electrode gear is the modification gear of machined gear and the machining accuracy can be improved by controlling errors. 相似文献
18.
Yu Zhigang Wang Bingle Song Liquan Zhou Shouguang Department of Mechanical Electronical Engineering 《保鲜与加工》1990,(2)
This paper introduces the main structure and function,the theor-etical basis and the main features of the computer aided design software system QT-SCAD for the steel structure of tower crane.The QT-SCAD is suitable for allkinds of movable or fixable tower crane with level arm which rotates above thecrane body,and has single or double hanging points.It can be used for the stre-ngth,stiffness and stability analyses of the structure,the vibrative and dynamiccalculation of mechanisms and structure,and the optimal design of the structureof tower crane or its components. 相似文献
19.
Xiao Dichen Liang Xichang 《保鲜与加工》1990,(1):13-22
In this paper, a calculation method of forming cutter contour of involute helical with arbitrary easement is presented, the segmantal arcs of the best uniform approximation and tolerance to fit smoothly the cutter contour points are used the profile on the cross section of the helical is calculated and the design of the cutter is examined. The method can be used to design precision forming cutter of involute helical with the arbitrary easement. It is valuable in engineering application. 相似文献