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23 June 1997, Volume 16 Issue 3 Previous Issue    Next Issue

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Semiactive Control of Damp in Automobile Suspension System Han Xi, Zhong Li 1997, 16(3): 1-4.  Abstract ( )   PDF (145KB) ( )   This paper studies on semiactive control algorithm in automobile suspension.A full-car model with suspension travel and tire deflection is presented, and the result is compared with passive sy stem.It is observed that the on-off dampers reduce mean square of car body acceleration but exaggerate mean square tire deflections and suspension travels. Related Articles | Metrics

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Basic Methods, Revisions and Applications of Identifying Seepage Free Surface Chen Hongkai, Tang Hongmei, Zhang Lukun 1997, 16(3): 5-10.  Abstract ( )   PDF (183KB) ( )   On the basis of analyses in detail on identifying seepage free surface methods including residual discharge method, initial discharge method, imaginary knote discharge method and imaginary element method, global composite element iteration method, one revised one is given in this paper.And seepage free surface of rockmass slope of permanent shiplocks on the Three Gorges Project is researched by the method, which tallies quite well with both overflow zones and ground water level insitu. Related Articles | Metrics

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Experiment Investigation of Manting Waterway Improvement on Lanchang River Shu Yuqing, Xu Guangxiang, Tong Sicheng 1997, 16(3): 11-17.  Abstract ( )   PDF (218KB) ( )   Manting large sadbar warterw ay of Lanchang-Mekon River is stuated near by Jinhong city in Yunnan of P.R.China and Burma.This reach composes of three different at Characteristics about selecting which engineering plan when control the reachs.This paper analysed comprehensively the data of flow, sediment and geology condition of Manting chaannel.Last it is suggested that the control flow tendency when control. Related Articles | Metrics

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Negative Shear Lag in Box Girder with Varying Depth Luo Qizhi, Yu Jianli 1997, 16(3): 18-25.  Abstract ( )   PDF (250KB) ( )   A finite segment model has been established and applied to analyse the negative shear lag in box girder with varying depth.This paper discusses the influence of the main factors, including the girder-height ratio, the width to length ratio and any loading arrangement, on the negative shear lag in variable-depth simple-, cantilever-, and continuous box girders.The features of the negative shear lag phenomena are described and some important conclusions are drawn about calculating the negative shear lag for box girders with varying depth. Related Articles | Metrics

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Current Status & Development Trends of Highway Bridge CAD Zhou Shuixing, Gu Anbang 1997, 16(3): 26-28,34.  Abstract ( )   PDF (120KB) ( )   This paper discusses current status and development trends of highw ay bridge CAD. Related Articles | Metrics

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Study on the Effects of Prestress on the Stability of Members Li Kefei, Du Guohua 1997, 16(3): 29-34.  Abstract ( )   PDF (183KB) ( )   In this paper, based on the principle of virtual work of finite displacement theory, the critical loads of members with prestress are developed by the analysis of several typical structures. These results make clear the influence of prestress on the critical loads.Meanwhile, a method of dealing with prestress is given, with its application to the stability analysis of structural engineering. Related Articles | Metrics

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The Study of Shearing Strength in Inclined Section of GFRP/RC Beams Fang Mingshan, Wang Shijie 1997, 16(3): 35-40,48.  Abstract ( )   PDF (204KB) ( )   Although studies of reinforcing RC beams with GFRP plates have been done over the passing years, most of them were limited to the reinforcing flexural strength of beams.In this paper, a comparative testing is performed.There are five pieces of simple-supported beams with 4 meter spans, one is RC beam without GFRP reinforcing and the others are reinforced both in the tension zone and inclined section with GFRP plates.At first, the structural behaviours of tested beams are described, such as stiffness, strength and ductility.Next, an analytical model for shearing strength in the inclined section of GFRP/RC beams is established, and a formula of shearing strength is derived according to the static balance method.A remarkable agreement between theory and experiment is found.Furthermore, as to the problem of crack controlling, a simplified and effective formula for calculating crackwidth is developed and verfied with the test. Finally, it is pointed out that the bridge repairing method can be applied widely in the future. Related Articles | Metrics

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Meso-mechanical Analysis to Tension Proportional Limit and Interficial Damage of Steel Fiber Reinforced Concrete Meng Yun, Tang Yu 1997, 16(3): 41-48.  Abstract ( )   PDF (291KB) ( )   Adding steel fiber to traditional concrete improves its tension strength and crack resistance to a great extent.By the meso-mechanical analysis presented in the paper, it reveals that the fiber's physical properties, geometrical conditions and the interficial bonding state have a marked effect on the macroscopic tension behavior of the composite.Theoretical formula of the tension proportional limit derived here gives a good agreement to the testing results. Related Articles | Metrics

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The Social and Economical Benefits Analysis of Developing SFRC Road Surface Meng Yun, Zhai Wuquan 1997, 16(3): 49-55,63.  Abstract ( )   PDF (211KB) ( )   In this paper, Supposing the life expectancy of road surface is 30 years, the social and economical benefits of kinds of road surface are analysed with the same measure by considering their different volume of traffic, maintaining cost, discount rate and synthetic expense.The result indicates that the social and economical benefits of SFRC road surface is more than those of common concrete and bituminous concrete. Related Articles | Metrics

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Fatigue Properties and Applications of Rubberized Asphalt Emulsion Modified Cement Concrete Li Guoqiang, Huang Wei, Deng Xuejun, Xiang Yanyan 1997, 16(3): 56-63.  Abstract ( )   PDF (229KB) ( )   Rubberized asphalt emulsion modified cement concrete (ERACC)is a new kind of organic-inorganic semi-rigid pavement composite.This paper reports the flexural fatigue test results and the fatigue equations obtained by using dual-parameter Welbull distribution.The safety factor for flexural fatigue is developed by the modification of specimen fatigue life.With the help of test road, this paper conducts initial studies on the structure analyzing method and the cost of ERACC pavement. Related Articles | Metrics

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The Concept and Analysis of Point-symmetry Structures Yang Decan 1997, 16(3): 64-67.  Abstract ( )   PDF (126KB) ( )   The concept of point-symmetry structures is proposed in this paper.Through studying the sy mmetrical characteristic of these special structures, it is discovered that point-symmetry structures can be simplified to half-structures to make the analysis as simple as axis-symmetry structures can, but the boundary conditio ns of their half-structures are different. Related Articles | Metrics

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Selection & Application of Curing Compound in the Mechanical Construction of Cement Concrete Pavement Hu Junxiong, Liu Tao 1997, 16(3): 68-72.  Abstract ( )   PDF (145KB) ( )   This article combines the practice of pavement curing in Fokai & Shenshan Expressways, introduces the characteristics of curing compound commonly used in our country with the focus on the application of the concrete curing compound Type SC-90 in the construction of the above-mentioned two projects. Related Articles | Metrics

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The Regulation and Research on Sediment in the Reservoir Rear of the Three Gorges Project Cheng Changhua, Wang Shiyi 1997, 16(3): 73-78.  Abstract ( )   PDF (197KB) ( )   According to the related model test achievement and the level control of the three gorges reservoir region, the present paper expounds the variation of sedimentation law and the harmfulness to the port and waterway of Chongqing reach after the construction of the reservoir.In the view of this situation, the comprehensive regulation measurements in many aspects should be adopted to solve this problem.The regulation work that solves sediment problem is approached in particular.The basic regulation principles, methods, forms of the reg ulation structures and layout of regulation scheme are advanced according to the different situation of sedimentation. Related Articles | Metrics

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An Approach to Commonsense Knowledge Representation in Mechanical Designing Expert Systems Miao Yi 1997, 16(3): 79-83,88.  Abstract ( )   PDF (185KB) ( )   An important problem in know ledge engineering, particularly in mechanical designing expert systems, is commonsense knowledge representation.In general, commonsense knowledge may be regarded as a collection of propositions.For the reason that the implicit quantifiers in propositions are usually fuzzy, the restrained variables are induced in this paper to represent the meaning of proposition by testing the score of an elastic restraint on the proposition.As the restrained variables are dependent only upon the original desig ning parameters, the decisions made in designing process can be denimished.Based on the idea that the random demarcation points between a proposition and its negation have a Gaussian distribution, an approach to test-score is presented in this paper. Related Articles | Metrics

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The Study of the Basic Risk Domain of Construction Project Zhou Zhi, Yu Yonghe, Fu Hua 1997, 16(3): 84-88.  Abstract ( )   PDF (154KB) ( )   The paper proposes the basic risk domain in three dimensions on the princple of risk developing, which not only reflect the develpment but also accords with the acquisition way to project risk.Then the paper researches general expression in mathematics of the domain in three dimensions for risk indentification and risk evaluation.The paper also studies the applications of the methed in risk analysis with project construction. Related Articles | Metrics

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Measurement of Rubber-refiner Vibration and Analysis of Vibration-seperating Result Shi Shangwei 1997, 16(3): 89-94.  Abstract ( )   PDF (189KB) ( )   This paper evaluates the vibration intensity of rubber-refiner and its affecting extent to nearby enviroment through vibration field-testing in the 2nd-floor rubber-refiner workshop of Chongqing tyre union factory.It mainly concerns about the theoretical analysis of vibrationseperating system and field-testing of vibration-seperating effect, and also analyses the functions of vibration-seperation system.Based on the work done, useful scientific basis has been provided for safe proceding of rubber-refiner and optimized design of industry technological process. Related Articles | Metrics

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Quality Control in Highway Construction Supervision Deng Heping, Cheng Houchang 1997, 16(3): 95-100.  Abstract ( )   PDF (189KB) ( )   The quality control is the most important one in progress and investment controls in highway construction, which is to benefit for later generations.The construction quality control is focal and difficulty point in the supervision work.The paper deals with the prog ramme, characteristics, methods basis and measures of quality control.Which are useful for the engineers and the supervisors. Related Articles | Metrics

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Some Focal Points and Measures of Structure Supenision in Highway Construction Cheng Houchang, Deng Heping 1997, 16(3): 101-105.  Abstract ( )   PDF (168KB) ( )   Based on the characteristics of concreting in air and in water, the paper discusses the rising seepage velocity (>6 mm/min)in hole while pile excavated in place is built in highway construction.The half range-concrete method is adopled to settle the transversal deflection in I-shaped beam with less transversal rigidity.Some measures are taken in the layered conerete of massive wall and the strip honeycomb with rough surface due to cement mortar seeped in construction joint. Related Articles | Metrics

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Problems and Countermeasures of Introducing Foreign Funds Wang Shuyun 1997, 16(3): 106-110,116.  Abstract ( )   PDF (167KB) ( )   This article devotes a discussion to the problems of introducing foreign funds and reasons incurred therein as weel as some countermeasures. Related Articles | Metrics

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Looking for Visual Best Path in the Graph of Communication Network Zhou Jianli, Tan Bin, He Xiaohong 1997, 16(3): 111-116.  Abstract ( )   PDF (178KB) ( )   In the graph of communication network, vertexes indicate cities, and edges indicate the highw ays between cities.It is important for communication to find out the shortest path from one vertex to another.There are many algorithms for looking for the shortest path.But, they just give out the vertex sequences of the shortest path.In this paper, we shall show how to give the visual shortest path.This shall be helpful for automobiles guiding. Related Articles | Metrics

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Permissible Velocity Correction Factors Yu Yuliang 1997, 16(3): 117-120.  Abstract ( )   PDF (119KB) ( )   This paper recommends a method about how to calculate the permissible velocity correction factors.This method brings on the formula of calculating the correction factors.It can directily calculate the value of permissible velocity correction factors according to the hydraulic radius of the trench and the scabrous factors, instead of the traditional method of estimating the value in a certain range.The example shows the method is easy to do. Related Articles | Metrics