Li Liren , Zhang Laiyi , Fan Xingyi , Xiao Yunhui Department of Civil Engineering
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.001
Abstract:How to select automatically the disposition of steel bar in a computer aided design(CAD)system for reinforced concrete frame structure is aproblem relatedt ot he practicality and increasing capacity of the CAD system.This paper suggests a practical method for selecting steel bar of beam in framestructure with the application of knowledge and experience of the experts forreasoning and judging.The method is convenient for calculation.The results ofcalculation are in agreement with detailing requirement and usual engineeringpractice.The method has great practical value.
Chen Zhonglin Department of Architecture
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.002
Abstract:Under the condition of average sky model,this paper studies the luminous flux arriving at the window and suggests the modified daylightingcoefficient method for estimating the area of the window.The method is simpleand easy to be carried out.And according to average sky luminance model,this paper has carried out the calculation of average sky lighting with a computer.The method described above is verified reasonable and applicable in engineering.
Li Baizhan , Tian Shengyuan Department of Urban Construction
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.003
Abstract:It is necessary to input the hourly meteorological data in order to analyze building annual energy consumption and to simulate dynamically air-conditioning systems.The hourly outdoor temperature constituted by cubic splineinterpolation when forming meteorological data is used for building energy anal-ysis.This paper analyzes the theory of spline function interpolation errors affe-cted by boundary conditions and introduces the methods to decrease interpolationerror.
Cai Yongtai Xiamen Building Scientific InstituteXu Jiabao Chongqing Institute of Architecture , Engineering
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.005
Abstract:本文研究了砂浆受酸液侵蚀的过程,并在数学上加以描述,建立了包括砂浆碱密度、侵蚀作用时间、氢离子浓度以及氢离子扩散系数等因素在内的砂浆酸蚀深度预测定量式.实验结果证实该定量式的计算值能较好地与实验值相吻合;同时表明,当侵蚀介质的酸度为pH2.0和pH3.0时,氢离子在砂浆酸化层中的扩散系数是在水溶液(9.1×10~(-9)m~2/s)中的8.9%和25.6%.
Li Huifeng Chongqing Institute of Architecture , EngineeringLiu Jianguo Southwest Municipal Engineering Design Institute of China
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.006
Abstract:本文分析探讨了高效肋片的强化传热机理,设计了一种新型肋片——带弧状凸起波纹人字条缝肋片,并制作了样机.通过正交试验设计,对试验工况作了安排;采用单纯形法,在微机上对试验数据进行了处理,拟合出了采用此肋片制作的空气表冷器性能试验关系式.结果表明:本研究表冷器较条缝型表冷器在迎面风速2.0~2.5m/s,水流速0.8~1.5m/s的最佳运行范围内,由于传热性能提高,改进换热器结构设计,外形体积缩小47~88%,材料减少15%.本研究的表冷器达到了节省有色金属耗量、紧凑小型化的目的,有推广应用价值.
Liu Zijian Department of Civil Engineering
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.007
Abstract:On the basis of comparing with usual methods,a method for interfacing AUTOCAD with high-level language by LSP file is proposed in thispaper.It solves the problem that a large number of graphics are drawn continuallywhile DXF and SCR file are not in a condition to use.This method is simple andconvenient to make good use of AUTOCAD graphic functions.
Liu Xianying Department of Urban ConstructionLi Xiaoqing Guangzhou Huatai Guesthouse
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.008
Abstract:本文对三种窝形翅片管——单面球形窝、单面柱形窝、双面球形窝与普通光滑平板式翅片管在吸风式直流风洞上进行了性能对比实验研究.采用微机对实验数据进行整理,得出了各种翅片的性能曲线和计算公式,并与平翅片进行了比较.研究结果表明:在迎面风速为1.7m/s~5.5m/s,雷诺数为840
Xiao Qinxue , Zhu Jingmin , zhang Siping Department of Civil Engineering
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.009
Abstract:on the basis of the experimental studies of mechanical properties in brittle rock,the generalized elastic modulus,generalized elastic Poisson ratio,irreversible deformation Poisson ratio and damage deformation characteristic arediscussed.And then,a new damage variable is defined.A new nonlinear elastic-damage constitutive equation is built and the damage evolution equation is proposed.The nonlinear elastic-damage constitutive equation is verified in the uniaxialcompression test of quartz sandstone in Chongqing.The results show that reasonableagreement exists between the theoretical analysis and the experimental data.
Peng Taihua , Zhou Yuqin Department of Natural Science
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.010
Abstract:This paper introduces new concepts of graceful matrix and har-monic matrix,and proves that a graph is graceful or harmonic iff there exists agraceful or harmonic matrix which is a P-adjacent matrix of a graph.This paperalso introduces a new concept of harmonic interlaced graph,and proves that agraph is interlaced iff it is also harmonic interlaced.
Liu Longquan Department of Civil EngineeringYu Zhigang Department of Mechanical , Elecrical Engineering
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.011
Abstract:In this paper,the penalty element stiffness matrix of linkage of plates and shells is deduced accrding to the principle of the penalty elementmethod.This stiffness matrix can be also used for a linkage between shells andsolids.It is of some practical value in the finite element calculations of engineeringstructure.
Tong Mingfang Department of Natural Science
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.012
Abstract:This paper studies a class of singular Cauchy problem for aquasilinear hyperbolic equation and shows that there exists a uniquely stablesolution by quasi-differential operators.
Jiang Qingming Department of Mechanical , Electronical Engineering
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.013
Abstract:In this paper,the error caused by the resistance of theMOSFET switch in the transmission of AC signals is straightforwardly derivedin combination with MOSFET physical model.The method ot decreasing transm-issiv eerror is presented.
Zou Jianbo Department of Natural Science
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.014
Abstract:In this paper,the concept of bifunction is introduced for the linear programming defined on the locally convex topological linear space.Theexistence of the solutions of the primal problem and its dual problem is discussed.And the relation between the primal problem and its dual problem is given.
Lai Xinchang The Computer Center
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.015
Abstract:This paper discusses dual-graph representations and Smith-diagram representations in the geometric description of building.These twomethods are quoted from Computer-Aided Architectural Design by Mitchell W.J.In this paper,they are discussed in combination with practical examples ofbuilding.In view of the fact that the references of CAAD is not enough inChina,this paper gives some help to people who engage in CAD.
Yu Zhigang , Wang Bingle , Song Liquan , Zhou Shouguang Department of Mechanical , Electronical Engineering
1990, 12(2). DOI: 10.11835/j.issn.1674-4764.1990.02.016
Abstract: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.
You are the visitor
ContactAddress:重庆市沙坪坝区沙正街174号,重庆大学A区
Postcode:400045 Fax:
ServiceTel:023-65111322 E-mail:xuebao@cqu.edu.cn
Copyright: ® 2024 All Rights Reserved