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26 August 1991, Volume 10 Issue 4 Previous Issue    Next Issue

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A New Type of Plate-Beam Spline Strip Elements Liu Zhong 1991, 10(4): 1-14.  Abstract ( )   PDF (707KB) ( )   In this paper, applying the principle of stationary potential, the author developed a plate-beam spline element, worked out the stiffness matrix and load matrix, and programmed this method. It is found that this spline strip method is more efficent in the analysis of T-beams, spline girder and other bridges. Related Articles | Metrics

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The Solution of Nonlinear Calculation Models for the Laterally Loaded Pile Wu Hengli 1991, 10(4): 15-19.  Abstract ( )   PDF (323KB) ( )   On the basis of analysing nonlinear passing force mechanism for the laterally loaded pile, this paper proposes a series of calculation models which describe the nonlinear procedures of pile-soil action. Some actual examples show that the main calculated engineering indexes, i. e. the deflection and the slopes of elastic curve of a pile at the ground surface, the maximum bending moment and its position,are in good agreement with those of the field measurement.Furthermore, according to the studies on the models of nonlinear subgrade reaction coefficients, we know more about the main characteristics of the pile-soil reaction throughout the whole loading process, that is, composite stiffness of pile-soil action will decrease nonlinearly with the increase of the lateral load, while the biparameter increases nonlinearly. Related Articles | Metrics

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On the Solutions of Congruence Equations with Even Number Degree for Prime Number Module P=3,5 Zou Zhaonan 1991, 10(4): 20-26.  Abstract ( )   PDF (427KB) ( )   In this paper,we prove that(1) for the Congruence Equation x2n+(x+1)2n+…+(x+h)2n≡(x+h+1)2n (mod 3)there are solutions if and only if h2, 4 (mod 9);(2) for the Congruence Equation x2n+(x+1)+…+(x+h)2n≡(x+h+1)2n (mod 5)there are solutions if and only if(i) if n≡0 (mod 2),then h2, 3,4,8, 9,10,14, 35,16,18,21,22 (mod 25);(ii) if n≡1 (mod 2),then h≠2 (mod 5). Related Articles | Metrics

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The Practice and Understanding of REFLEX Beams Yin Dingan 1991, 10(4): 27-33.  Abstract ( )   PDF (544KB) ( )   The preflex beam is composed of a preflexed steel beam with a high yield point, the tensioned part of which is encased in high-quality precompressed concrete.It obtains various advantages and special characteristics in structural field.The following items are narrated and discussed in this paper.1. The test results and analyses of actual dimension of PREFLEX beams.2. The discussion on the design of section, the effect of restraint at supports, the factor influencing the precompression, the standard of section stress on the whole load stage, etc.Finally, the research and production on the PREFLEX beams in our country are discussed and stressed for the future use. Related Articles | Metrics

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On the Shear Strength of Reinforced Concrete T-Beams Zhong Shengbin, Cheng Xiangyun 1991, 10(4): 34-43.  Abstract ( )   PDF (1242KB) ( )   Using the experimental data of our 50 T-Beams and the material obtained from other countries, this paper analysed the formulas about shear strength in inclined section of reinforced concrete beams for the Current Highway Bridge Code for Design in China.Then we obtained the statistical parameter and probabi listic distribution of the calculation model indeterminateness in shear strength of inclined section for simply supported reinforced concrete T-beams. Related Articles | Metrics

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Diagonal Crack Width of Partially Prestressed Concrete Beams With Unbonded Tendons Zhou Zhixiang, Jiang Bingzhang 1991, 10(4): 44-51.  Abstract ( )   PDF (571KB) ( )   Based on the shear test data of 50 beams with bonded tendons and 25 beams with unbonded tendons, this paper studies the influences of shear force, degree of prestress, shear span-depth ratio, stirrup, content and curved tendon on the development of diagonal cracks of P.P.C. beams with unbonded tendons. It is proposed that the calculation of the diagonal crack width under the influences of the above factors be transferred into determining the equation of the curve in shear-crack width coordinate system. Combined with the statistical analysis on the test data, a formula with a simple form is obtained to predict diagonal crack widths of P.P.C. beams with unbonded tendons. Related Articles | Metrics

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Experiment and Analysis on the Behaviours of the Cold Drawn and Spiral Low Carbon Wire Xu Xibin, Zheng Jianhua 1991, 10(4): 52-59.  Abstract ( )   PDF (581KB) ( )   Cold drawn and spiral low carbon wire is a new type of cold drawn low carbon wire.The behaviours for its material and bond are studied by experiment.It is used as the main reinforcement of prestressed concrete hollow-coreslabs.It is shown by the experiment on and the analysis of the behaviours of nine specimens that the new type of wire performs well to improve the failure form of the prestressed concrete hollow-core slabs in this paper. Related Articles | Metrics

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An Algebraic Theory on Modular Programming Li Junxiong 1991, 10(4): 60-64.  Abstract ( )   PDF (334KB) ( )   To formalize the process of the stepwise refinement in programming, the concept of refinement implement was defined in paper[1]. In this paper, we propose the modular implement as the formal description of modular programming. It is proved that the modular implement is horizonally and vertically composable. The refinement implement is really a special instance of the modular implement in this paper. Related Articles | Metrics

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The Approach to the Formative Arts for Urban Pedestrian Bridges Yang Shijin 1991, 10(4): 65-77.  Abstract ( )   PDF (5672KB) ( )   In this paper, the plane composition and the design of the. building facade and space for urban pedestrian bridges are discussed based on the formation condition for the bridges, and through the analysis of actual examples the formation theory and design technique of the bridge are inquired. Related Articles | Metrics

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Microcomputer Control System for Flow and Water Level of Model Test Ding Shengqi 1991, 10(4): 78-84.  Abstract ( )   PDF (521KB) ( )   The microcomputer control system for flow and water level on the model by the standards of navigation water technology of the Yangtze River between two dams is presented in this paper. The composition of this system, computer hardware and software, and P. I. D. control calculation was used in this system and the result is proposed. Related Articles | Metrics

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Calculations of the Slabs in the Slab Design of the High Pile Warfs of the Beam-Slab Structure Zhang Zhihong 1991, 10(4): 85-95.  Abstract ( )   PDF (743KB) ( )   In the design of the slabs for the high pile warfs of the beam-slab structure, the slabs are divided into the single and double acting slabs in the standard specifications of the harbor engineering, and the bending moment occurs in one or two directions of the axe center when the slabs are acted on by the loading, and an idea of the width of the efficient range of loading is introduced into the single acting slabs to simplify the calculation.In this paper, on the basis of the elastic theory and the present tests the idea is discussed for the slabs,the problems in the use of the standard specification are pointed out, and suggestions about different load, width-span ratio, and the kinds of the slabs are made when the slabs of the high pile warfs are designed, which have some technic economic worth for the design of the high pile warf slabs. Related Articles | Metrics

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Finite Element Analysis of Jointed Concrete Pavements Zhao Jiajun, Huang Xiaoming, Deng Xuejun 1991, 10(4): 96-103.  Abstract ( )   PDF (605KB) ( )   In this paper, the shortcomings of the present load-transfer models of concrete pavements are analyzed and a new analytical model which can transfer shear and moment through steel dowels is presented.The steel dowels are modeled as thick short beams resting on an elastic concrete medium. A computer program denoted as FEAJCP which is based on the new model and finite element theory is presented. It can analyse stresses, deflections and joint efficiencies of concrete pavements with keyed, aggregate interlock, flat or dowel joints. It has been proved correct compared with the results of the computer program named JSLAB of PCA. The model and the computer program may be used as a basis for theory research of concrete pavements designs. Related Articles | Metrics

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The Measure Principle and Method of Bending Damage for Concrete Pavement Yu Jianrong 1991, 10(4): 104-109.  Abstract ( )   PDF (347KB) ( )   The basic principle and method of measure of bending damage is discussed. Analysis of test results of concrete beams which are subject to static and fatigue load is formulated. Finally, the differential method which estimates the bending damage of old concrete pavement is presented. Related Articles | Metrics

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Calculation of Transverse Load Distribution of the Girder Bridges with Inequal Web-Distance Using G-M Method Jiang Zhigang, Hu Zhengyi 1991, 10(4): 110-114.  Abstract ( )   PDF (294KB) ( )   In this paper,the general formulation for calculating the transverse load distribution influence lines of the girder bridges is presented, based on the G-M method. The method for computing the transverse load distribution influence lines of the girder bridges with inequal web-distance is proposed and illustrated with an actual engineering example. Related Articles | Metrics

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An Economic Study of Motor Transport industry Wang Jian 1991, 10(4): 115-122.  Abstract ( )   PDF (575KB) ( )   The motor transport system performance is the interactions between resource consumed and service levels.In this paper, we deal with the policy of motor transport industry through the cost functions and vehicle cycles. Related Articles | Metrics

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Coloring Method of Using Dyes for Ornannentai Faces of the concrete Bridge Liu Wanzhen, Jiang Yihua 1991, 10(4): 123-130.  Abstract ( )   PDF (627KB) ( )   This method advances the coloring use of dyes to replace pigments for of the concrete bridge various ornamental faces, for example, banister, baffle plate, bridge-end building, signplate, safety fence, building of divided road, etc. It is suited to the coloring of any wall cladding. Related Articles | Metrics