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20 April 1992, Volume 11 Issue 2 Previous Issue    Next Issue

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Some Results on the Finite Complete Set of the Multi Valued Logic and Fuzzy Logic Functions Li Junxiong 1992, 11(2): 1-7.  Abstract ( )   PDF (466KB) ( )   Given any set A whoso elements are functions,if there exists a finite set C,C≡A,such that each function in set A can be implemented by a combinatorial network of the functions in set C,it is said that C is a finite complete set of the functions in A.For example,the function set (x∧x,x∨x,x) is just a finite complete set of the two-valued logic functions.In this paper,a set consisting of 4 functions is given and proved to be a finite complete.set of the α-valued logic functions (α≥2).It is aiso proved that no finite complete set exists for the fuzzy logic functions.In addition to the above results,a formal inference system FUNCc is created and it is proved that each combinatorial network of the functions in C is equivalent to a theorem of the FUNCc. Related Articles | Metrics

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Study of the Lateral Stability of the Deck Type Ribbed Arch Bridge Xiang Zhongfu, Gu Anbang 1992, 11(2): 8-13.  Abstract ( )   PDF (357KB) ( )   The lateral stability of the deck-type ribbed arch bridge is analyzed based on the model tost and energy approach,and a formula to determine the critical load is given. Related Articles | Metrics

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Concept of Critical Bimoment and Its Use Li Kaixi, Cui Jia 1992, 11(2): 14-22.  Abstract ( )   PDF (519KB) ( )   This paper derives the concept that bimoment has critical value.According to the concept,an interaction formula that shows the relationship of various critical forces and a torsion angle amplification factor of members is obtained.A new modification of the formula is proposed to solve the problem that the formulas used in the plane and out the plane are disjointed in the present specifjcation.The initial imperfection and elastic-plastic property of the member are presented by an equivalent eccentric ratio.Finally,the formula is illustrated by several examples,e.g.columns and beams. Related Articles | Metrics

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Appraisement of Design Theories on Cantilever Deck of Highway Bridges Zhang Shiduo 1992, 11(2): 23-35.  Abstract ( )   PDF (651KB) ( )   The cantilever slab designed by Chinese highway bridge specification (JTJ-023-85) shows unrationality and unadaptability in the case of long cantilever side slab.In this paper,Sawko's and Bahkt's practical formulae which give up the concept of effective width of slab are introduced.From the calculation and comparison in the illustrative example,it shows that the value of the moment existing at the root of the long cantilever side slab,is on the unsafe side.Some experimental results and spline finite strip analysis are presented.Finally a formula with A'values is given to improve Bahkt's results. Related Articles | Metrics

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Analysis of Steel Fibre Reinforced Concrete Beams Lin Changqing, Peng Shaomin 1992, 11(2): 36-41.  Abstract ( )   PDF (414KB) ( )   Based on a large number of experiments on the ultimate flexural strength of steel fibre reinforced concrete beams (SFRCB),the reinforcing mechanism of flexural strength of SFRCB and the rationality of several strength-calculating formulas are discussed in this paper.By the analysis of the experimental data,an ideal formula is proposed. Related Articles | Metrics

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The Effects of Water-Gasoline Mixturer on the Combustion Process of Gasoline Engine Shao Yiming, Dai Guanjun 1992, 11(2): 42-49.  Abstract ( )   PDF (621KB) ( )   In this paper,the authors mainly deal with the experimental results of the effects of the propotion of water in mixture on the mixture temperature in the inlet port of gasoline engine,on the emission of engine combustion,on mixture ignition,delay,and on the rate of combustion heat. Related Articles | Metrics

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Inquiry into the Strength of Partially Prestressed Concrete Beams Zhou Zhixiang, Jiang Bingzhang 1992, 11(2): 50-55.  Abstract ( )   PDF (405KB) ( )   Stresses of concrete in shear compression zone are analysed when a shear compression failure takes place in a partially prestrcssed concrete beam.A new model is proposed on the basis of Coulomb-Mohr's failure theory and static equilibrium conditions.The calculative parameters in the model are determined by a statistical analysis on lots of test data according to the model.The formula obtained for predicting the shear strength of beams can be conveniently used in designs for its simple form,wide applicability and good accuracy. Related Articles | Metrics

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Application of Out-Region Method to the Analysis of Plate on Elastic Foundation Wang Kai, Xia Yongxu, Hu Qingan 1992, 11(2): 56-64.  Abstract ( )   PDF (586KB) ( )   The out-region method (ORM) is another powerful numerical analysis technique following FEM and BEM,In this paper,the analysis and calculation of the thin plate with free edge on winkler foundation or elastic semispace foundation is presented,using the ORM.The results show that ORM has not only well-known merits of BEM,but also an advantage over BEM. Related Articles | Metrics

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The Relative Efficiency of Automotive Transportation Enterprises and Its Measures Yang Lei 1992, 11(2): 65-75.  Abstract ( )   PDF (672KB) ( )   This paper deals with the measure of efficiency of scope and technology of auto-motive transportation enterprises (ATE) by using data envelopment analysis (DEA).It gives the I/O target system,sets up two models-C2R model for the efficiency of scope and technology,C2GS2 model for the efficiency of technology,and analyses the economic implication of the relative efficiency of DEA.At last,applying the C2R model and C2GS2 model it gives an example of application of DEA methods and models for the measure of the relative efficiency of 23 ATE. Related Articles | Metrics

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Numerical Analysis of Flow over Camel Hump Weirs Yu Huaqian 1992, 11(2): 76-80.  Abstract ( )   PDF (313KB) ( )   Using the ideal irrolational flow model,the flow over camel hump weirs issimulated with the velocity potential function which is a fundamental unknownfunction.The data of the discharge coefficient,water-surface profile and pressuredistribution on weir surface,etc.are obtained. Related Articles | Metrics

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The AHP-Fuzzy Method of Comprehensively Evaluating the Condition of Flexible Pavement Distress Lu Yaxing 1992, 11(2): 81-88.  Abstract ( )   PDF (456KB) ( )   The evaluation of the condition of flexible pavement distress is an important part of pavement management system,by which the strategies of flexible pavement maintenance are made.In this paper,the author sets forth a set of indices for evaluating the condition of flexible pavement distress by analysing the research results of the past about flexible pavement evaluation,and adopt the AHP method to construct hierarchy analysis model for determining the weight of each index in the evaluation of the condition of flexible pavement distress.Finally,the author presents a fuzzy mathematics model for comprehensively evaluating the condition of flexible pavement distress. Related Articles | Metrics

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Differential Analysis of Shrinkage and Creep in Steel-Concrete Composite Sections Sun Baojun 1992, 11(2): 89-95.  Abstract ( )   PDF (473KB) ( )   In this paper,time-dependent stresses and deformations of steel-concrete composite sections may be calculated with the age-adjusted effective modulus and the concept of differential shrinkage and creep.The non-elastic time-effective questions on long actions can be turned into elastic questions.The effects of both shrinkage and creep of concrete on the behavior of the cross section are determined and discussed.The procedures can be berformed manually,but are best suited to microcomputer.An example is illustrated in detail. Related Articles | Metrics

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The Mechanical Analysis and Principles of Strengthening Design by Sticking Steel Bars Chen Zhongyang, Yie Jianshu, Shao Rongguang 1992, 11(2): 96-102.  Abstract ( )   PDF (455KB) ( )   The strengthening mechod by sticking steel bars on the bottoms of bridges has a lot of merits.It is used more and more in engineering.Many experiments have been made and some materials have been got.But we still lack the theoretic analysis and studies.This paper gives the analysis of the mechanical characteristics in the design method.It also presents the basic hypothesis and design theories according to the experimental materials in Ref.l. Related Articles | Metrics

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The Microstructure and the Wear Resistance of 45-Steel after Laser Transformation Hardening Zheng Ling 1992, 11(2): 103-107.  Abstract ( )   PDF (1211KB) ( )   This paper deals with the microstructure and the wear resistance of 45-steel after laser transformation hardening.The experimental results show that the hardened zone is composed of three layers:the hardened layer,the partially hardened layer,the transition layer.The hardened layer consists of fine martensites.The partially hardened layer consists of fine martensites and a few bainites.The transition layer consists of martensites and a few carbide-free bainites and some undissociated ferrites.The hardened zone has better plastic deformation resistance and adhesive wear resistance properties that come from the contribution of martensite to strength and hardness of the hardened zone,and the contribution of residual austenite and bainite to toughening of the hardened znoe. Related Articles | Metrics

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Computer Simulation of the Earth Pressure on Conduit Buried in Fill She Xuesen 1992, 11(2): 108-114.  Abstract ( )   PDF (512KB) ( )   By means of computer simulation,in this paper,the influence of topography and the conduit structure on the earth pressure is studied,the influence of fill construction by layers is also taken into consideration.A computer program is compiled,which has the advantages of dividing the elements automatically and of simulating the topography,the conduit structure and the properties of every tier of fill.It needs less data-input and takes less computer storage. Related Articles | Metrics

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The Finite Element SOR Parallel Algorithm with Color Line Dissction Hu Ning 1992, 11(2): 115-117.  Abstract ( )   PDF (766KB) ( )   In this paper,by utilizing the color line partitioning,the renumbering of nodes is carried out.So the form of stiffness matrix is suitable for the SOR algorithm and the parallel steps can be introduced into it very easily.The concurrent operational results illustrate that this algorithm can save computational time effectively and is an effective parallel iterative method. Related Articles | Metrics