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19 February 1993, Volume 12 Issue 1 Previous Issue    Next Issue

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Investigation on the Stress State in Non-Presstressed Steel in Prestressed Concrete Beams Zhong Mingquan, Che Huimin, Shao Xiaokang 1993, 12(1): 1-6.  Abstract ( )   PDF (442KB) ( )   The tests have shown that flexuval fatigue failure in partially prestressed concrete beams often results from the fracture of non-prestressed steel. A good knowledge of the stress state of non-prestressed steel in the beams is essential. based on the measured results of the load-induced strain and the residual strain in non-prestressed steel in seventeen beams, a high compression stress state due to shrinkage and creep prior to the test was verified, and the empirical formulae for predicting the residual strains in non-prestressed steel under static and repeated loadings were presented. Moreover, the effects of repeated loading on the stress state and fatigue strength of non-prestressed steel are also analyzed and discussed. Related Articles | Metrics

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Statistical Analysis for Normal Berthing Velocity of Inland Fleet Wu Songren, Yang Chengyu, Yang Yingyun 1993, 12(1): 7-18.  Abstract ( )   PDF (741KB) ( )   Based on the serial site measured data of normal berthing velocities for different inland fleets,the statistical analysis has been made in this paper,which shows that the probability distribution at any time point for normal berthing velocity of inland fleet tends to have extremum I type distribution. Adoption the filtered poisson proccess as the probability model, the statistical characteristics of the berthing velocity of inland fleets in the design reference periods have been obtained and compared with the sugggestion value by the current Tentative Specification of Harbor Work(1987). Related Articles | Metrics

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A Simple Estimatiion of the Hydrrodynamic Forces on large Vertical Cylinders During Earthquakes Miao Guoping, Ji Chunqun 1993, 12(1): 19-31.  Abstract ( )   PDF (699KB) ( )   Some offshore and hydraulic structures have configurations as unifform vertical cylinders of equal section. The hydrodynamic forces acting on them during earthquakes must be rationally estimated in the anti-seismic design. Based on the strict potential theory, a series of tables is given in the paper, which can be used to simply estimate the hydrodynamic forces on large vertical cylinders with several commonly used sections rigidly or elastically vibrating during earthquakes. The tables and estimation procedure are of practical signficance to the engineerng design and the formulating of the rrelated regulations. Related Articles | Metrics

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Dynamic Analysis of GRP/COM Sandwich Beam Kuang Shi 1993, 12(1): 32-40.  Abstract ( )   PDF (500KB) ( )   In this paper,the finite element analysis techique is applied to study the dynamic characteristics of the GRP/COM sandwich beams.and the experimental modal analysis method is used to verify the rightness of the finite element models and to make an optimization comparison with the effect to dynamic parameters of the beams at different FACE/CORE ratio and different density in experiments. Related Articles | Metrics

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Experimental Study on Application of Wide-Type Precast Hollow Slab in Pier Engineering Zhu Xiufeng, Yang Yingyun, WU Songren 1993, 12(1): 41-49.  Abstract ( )   PDF (525KB) ( )   Based on the experimental results of wide-type precast hollow slab in Zhenhing harbor, the transverse load distribution patterns of wide-type precast hollow slab groups are described and a computation method for predicting the transverse distribution of the ball joint wide-type slabs is recommended in this paper. Related Articles | Metrics

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Division Approach of Environment of Highway Waste by Water in Sichuan Province Bai Zipei, Chen Hongkai, Zhang Zhihong 1993, 12(1): 50-55.  Abstract ( )   PDF (416KB) ( )   Highway waste by water is a strongly restricted factor for the regional economic devel opment, which is an incoordinate result of environmental factors of waste by water. On the basis of field investigations this paper divides the environment of waste by water into 6 big zones, including 3-4 small zones in any big zone in Dephel values of geology, landform and climate, etc. It is found that the division is reasonable after our examinations of the economic losses of highway waste by water between 1976~1990 and of the distribution of the waste. Related Articles | Metrics

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The Effectiveness And Forecast of Vehicle Movement State Yang Lei 1993, 12(1): 56-63.  Abstract ( )   PDF (474KB) ( )   The artificial factor is important for effectiveness, reliability and mean life of the stable state of the transport system. The differemtial equation of the state transition has been created in this pqper based on the homogeneous Markov process. The system state probability and measure of reliability has been solved with Iaplace transform. At the end of the paper, we estimate the mean time to failure of the vehicle. Related Articles | Metrics

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Introduction to the Design and Construction of Dabaoshan Tunnel Luo Min 1993, 12(1): 64-70.  Abstract ( )   PDF (380KB) ( )   Dabaoshan Tunnel is located within the boundary of Shaoguan City, Guanydong Province. It is 431 meters long and 9 meters in clear width. Three-centered-circle arched wall is adopted in lining,and I-steel welded with stceel centering is used in the most complicared geologival zones to reinforce the lin-ing of the tunnel. In construction, special methods are used to treat the bad geological areas, shch as concrete spraying to seal the cracks, pressure grouting to consolidate the fracture zones, concrete pumping to packfill the lava tunnel, and building-in steel vail cover plate to span the lava channels. Now the tunnelruns effectively as a whole. Related Articles | Metrics

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On the Relation Between Alignment Velocity and Traffic Accidents Li Shuqing 1993, 12(1): 71-79.  Abstract ( )   PDF (601KB) ( )   According to the traffic safety conditions in main roads of Chingqing City, this qualitatively and quantitatively analyses the relation between alignment, velocity and traffic accidents. From the viewpoint of reactions on a travelling automobile, it derives the formula for several elements of the road with gradient and curve in an alignment vertically and horvizontally coordinated, and points out the defects of the existing highway deesign standard to the road. Finally, it discusses highway speed limit and proposes four basic principles to determine the value of speed limit. Related Articles | Metrics

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The Compensation of Temperture and Pressure Form Hot-Wire Anemometer Output Signals Liang Xiongyao 1993, 12(1): 80-88.  Abstract ( )   PDF (536KB) ( )   This paper presents the influence on the heat loss to hot-wire supports from temperature and ptrssure of gas. Considering the heat loss to the hot-wire supports, A revised formula is estabilished. On the basis of experiments. A semi-experienced formula is presented to easily calculate the heat loss to the hot-wire supports. It has been proved that these formulae are correct and of important value in theory and practice. Related Articles | Metrics

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Application of Constrained Concrete Filled Tube to Low-Height Girder Yin Dingan 1993, 12(1): 89-95.  Abstract ( )   PDF (403KB) ( )   This paper introduces the mechanism of the compressive concrete filled tube, calculates and analyses the formula of the ultimate bearing capacity of concrete filled tube considering the effect of concrete which is bound on the outside. Finauy, it illustrates that concrete filled tube is effective for reducing the height of girder and shows that the excellent charateristic of concrete filled tube can be transplanted to shallow girder to develop the field of achieving the low-height girder extensively. Related Articles | Metrics

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An Experimental Research on the Hydraulic Property of Navigation Lock Valve of Culvert Shape Liu Pingchang, Liu Debang, Xiang Wenying 1993, 12(1): 96-101.  Abstract ( )   PDF (431KB) ( )   This paper introduces an experimental research and calculates the results of the analyses of two sorts of culvert shape behind the navigation lock valve (top expansion, sudden expansion). It compares two sorts of the flow state, the drag coefficient in valve, the lowest pressure and the decrease of pressure, the cavitation resistance characleristic at the bottom of the valve, etc. It also analyses the reasons why they are different. At the end of this paper, it recommends the instantly-expanded gallery which can keep valve cavitation off for the reference of the designers concerned. Related Articles | Metrics

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A New Greedoid in Diagraphs Chi Jie 1993, 12(1): 102-105.  Abstract ( )   PDF (237KB) ( )   In this paper, a new greediod in diagraphs is formed. Related Articles | Metrics

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Discussion of the Calculation in Water Force About the Water-Transportion System in a Short Iressure Pipeline of a Chamberlock Liu Hua 1993, 12(1): 106-111.  Abstract ( )   PDF (364KB) ( )   This article deals with the calculation of flow coefficient which is in a water-transporting system of the short pressure pipeline of a chamberlock. On the basis of the linear assumption and the computation looking up tables, the assumption of secondary curve is used to make the theoretical value of flow coefficient near an actual condition all the more. And a series of calculative formulas of water force is induded, and the theoretical analysis is provided for the design of the water-transporting system in a chamberlock. Related Articles | Metrics

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Sewage Dilutuin Metering and Analysis in Sibao Reach of Qiantang River Chen Yongjuan 1993, 12(1): 112-118.  Abstract ( )   PDF (459KB) ( )   This paper describes the site metering and analysis of water quality in the sewage drain reach of Sibao sewage treatment plant, Hangzhou. The river pattern and hydrology of sewage drain reach, the methods and instruments of water quality sampling and water discharge measurement are briefly introduced. For the water quality metering, the index of COD, DO, pH, SS and water temperature is analysed and discussed. The results of the numerical model of COD distribution is also introduced. Finally, the summary value of the engineering benefit of the sewage drain work and the effect of the sewage dilution are made. Related Articles | Metrics