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15 December 2003, Volume 22 Issue 4 Previous Issue    Next Issue

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Fuzzy comprehensive evaluation in optimal selection of old bridge's reinforcement project ZHENG Xiao-gang，XIAO Sheng-xie 2003, 22(4): 1-3.  Abstract ( )   PDF (241KB) ( )   Because the influence factors in the selection of old bridge's reinforcement porposals is fuzzy,the comprehensive evaluation method is proposed in decision making of reinforcement project.The paper introduce the math model and process of this methoh in detail along with some example for test.The result shows that method is simple and useful,worthy of referring. References | Related Articles | Metrics

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The calculation of the lofting coordinate of the ring segments for the CFST arch bridges ZHANG Min 2003, 22(4): 4-6.  Abstract ( )   PDF (202KB) ( )   It's the important work for calculating the lofting coordinate of the ring segment for the concrete filled steel tubular arch bridges.The original method,which enlarged the model,took not only long time and many works,but also need a ladge field.The directly method on lofting coordinate by means of plane gemrtry relation may calculating heavily simply the procedure and improve the lofting precise.The formula can also apply to the reinforced concrete arch.Aflow chart was given in this paper for computer program.This method has been successfully introduced in many CFST arch bridges. References | Related Articles | Metrics

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Numerical simlation of dynamic emulation on construction process in Yangzong expressway tunnel ZHANG Peng-yong，XU Lin-sheng，WANG Xin-ping 2003, 22(4): 7-10.  Abstract ( )   PDF (325KB) ( )   On the bassis of S5optimized design drawing of 皿 surrounding rock masses and measured data in site in Yangzong expressway tunnel, obtaning Eand K of surrounding rock masses by back analysis ;the dynamic emulation simulatation of construction process has been conducted with FEM methods, feedback controlling design is realized and the construction is controlled. References | Related Articles | Metrics

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Simulating influence of soft rock on channel structure by using finite element method He Bing 2003, 22(4): 11-13.  Abstract ( )   PDF (347KB) ( )   This papre establishes the Finite Element model of soft rock channel by selecting proper creep model of soft rock.Taking a highway channel as an example ,influence of construction time of anchor rod and supproting structure on deformation and stress of channel structure is analyzed.The model of this paper can be used on other underground structures at soft rock region. References | Related Articles | Metrics

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Excavating tunnel construction plan analysis for mountain ridge highway tunnel XIONG Si-hua，FAN Cao-yuan 2003, 22(4): 14-16.  Abstract ( )   PDF (252KB) ( )   Excavating and exiting tunnel are the most complicated sites in the tunnel construction condiuons , while they are also the site of the most hidden dangerous in quality and safety . If we properly choose the plan of excavating tunnel , have the aid of some subsidiary construction measures and excavate naturally tunnel , we can effectively avoil the unstability of the mountain slope evoked by brushing slope arid pulling slot . consumedly decrease the engineering construction cost of turuiel protection protect ecosystem environment . References | Related Articles | Metrics

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Discussion of the forming mechanism of reflective cracks in pavement from the angle of deformation compatibility YI Zhi-jian 2003, 22(4): 17-19.  Abstract ( )   PDF (555KB) ( )   After the asphalt pavement is added on to the base or old pavement with existing creeks , the cracks will reflect into the paveirient. In the paper the forming mechanism of the reflective cracks is analyzed fnxu the angle of defommtion compatibility relation , and the prevention way of re0ective cracks discussed. References | Related Articles | Metrics

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Closed-traverse method of center-center lines of circles in horizqnt alignment design of road interchange WU Guo-xiong，CHEN-dou 2003, 22(4): 20-24.  Abstract ( )   PDF (360KB) ( )   The piper puts forward closed-traverse method of the lines of osculation and the closed-traverse method of the center-center lines of the circles . Based on the parameter equation of the track of the instantaneous center of the circle of the easement, its characters can be obtained, and then the lines of osculation and two through lines known commented to form the closed-traverse .According the arious compound styles ,corresponding methods can be found . Atlast ,design and calculation of horizontal alignment of interchange can be accomplished by using the calculating methods of easement alignment The design methods has been approed by examples . References | Related Articles | Metrics

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The research of englneeriiig database in Integrated CAD system of hlghway YANG Hong-zhi，XU Jin-hang，YANC Thao-wei 2003, 22(4): 25-28.  Abstract ( )   PDF (399KB) ( )   Based on the analysis of the data requirements and following in the highway design ,this discusses the character of engineering databased and plans the architecture structure of highway engineering database. This paper emphasizes on the expanding research of Relational Data Model. Further more ,it constructs the relationship-OOP model as the data model of engineering database. Based on those theorise and the special requests of data marupulation in highway design process, this paper has constructed the standard data query classes, plane engineering classes etc. And by enclosing these classes, the functions of database are expannded effectively and the highway engineering database and high standard database with the functions of real-time query, real-time modification, real-time storage and supporting distributing design has been constructed. References | Related Articles | Metrics

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A method to simulate elastoplastic beam HE Bing，WANG Xiao-yi 2003, 22(4): 29-32.  Abstract ( )   PDF (232KB) ( )   According to the requirement of bridge engineering , a equivalent element group model of elastoplastic beam is presented . This equivalent eminent group is composed of a beam element and a truss element group. The formulas are deduced according to the load-deformation curve of the elastoplastic beam . This equivalent element group model of elastoplastic beam is used on the piers of a bridge ,and the seismic responses are calculated out. References | Related Articles | Metrics

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Vehicle dynamic loads caused by the surface evenness YU Qing，CAO YUAN-wen 2003, 22(4): 32-34.  Abstract ( )   PDF (218KB) ( )   In this paper , 4-degree-of-freedom's vehicle model is developed, with the comideration of the influences of vehicle roll on dynamic loads caused by pavement roughness . By using this model , the vehicle dynamic loixle under different vehicle speeds and wave-lengths but the saw wave-highs pavement roughness. References | Related Articles | Metrics

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Creep buckling of braid composite cylindrical shell HE Huang，TANG Guo-jin，JIANG Zhi-gang，WANG Ke-sheng 2003, 22(4): 35-38.  Abstract ( )   PDF (270KB) ( )   A creep buckling armlysis of braid comjxsile cylindrical shell ie given in this papre by means of theoretical armlyeis ,the instantaneous cnncal load and dumble cntilcal load of viscoelastic braid conipceite cylindrical shell are calculated. References | Related Articles | Metrics

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Study on pavement performance of different types of asphalt mixtures LIU Hong-ying 2003, 22(4): 39-42.  Abstract ( )   PDF (330KB) ( )   The different gradabon asphalt niixlurie have great influence on pavement performance . The paper uniBzed wheel tracking tist at high temperature, the bend test at low temperture and bend fatigue test to study pavement performance of SMA and large size asphalt mixture (LSM) , and then it is compared with dense gardation asphalt mixture. The results show that modified asphalt can impmve significantly technical performance, SMA and LSM have super pavement performance , the resistance to deformation in high temperture and resistance to fatigue of LSM is bettr than that of SMA , but the performance resistance to crack of SMA at low temperture is better than LSM . References |