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15 October 2006, Volume 25 Issue 5 Previous Issue    Next Issue

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The design research on raising the bearing capacity of long-span stone Two-way Curved Arch Bridges MU Chang-chun，ZHANG Hui-li，MENG Yun 2006, 25(5): 1-4.  Abstract ( )   PDF (176KB) ( )   The Youdu River bridge, which was built in 1972 with the longest span, is a two-way curved arch bridge. During its construction it became dangero us because the arch frame was washed away due to the flood, and the arch to psagged 51.7cm.In 1985 it was reinfo rced with Bolt Anchored Concrete, and then it can bear the car-15, gua-80 load. But after 20 years, it must bear the qi-20, gua-100 load due to the traffic development. In this paper the reinforced method is introduced. This can be referenced by the following project. References | Related Articles | Metrics

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The application of gray system theory to construction control for Jialingjiang river bridge in baiguodu YANG Lei，ZHANG Yong，hui，GAO Jian 2006, 25(5): 5-8.  Abstract ( )   PDF (202KB) ( )   The grey systems theory applied in continuous rigid frame bridge construction control is discussed in this article. The auther makes the practice of the construction control for Jialing jiang river bridge in Baiguodu as an example. Combined with the construction control, this paper introduces the basic principle, specific execution procedures and the application validity of this gray predictive control system. This conclusion can be extended to be used in the construction of the continuous beam bridge,the arch bridge, the cable-stayed bridge etc, which constructed by cantilever erection. References | Related Articles | Metrics

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Application and development of prestressing technique in prestressed concrete bridge LIU Shan-hong 2006, 25(5): 9-12.  Abstract ( )   PDF (193KB) ( )   Improvement of prestressing technique is needed by development of concrete performance used in long span concrete bridge engineering.Deficiencies of prestressing technique used in construction are presented now adays. Several common schemes and capabilities of primary sensors used in new types of prest ressing equipments controlled by digital computers are also described. It can be used as improvement references of construction techniques by now . References | Related Articles | Metrics

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FEA analysis of geometry nonlinear reinforced concrete rigid-frame arch bridge CHEN Gui-mei，WU Jin-liang，SHEN gang 2006, 25(5): 13-16.  Abstract ( )   PDF (1284KB) ( )   In this paper, the constitutive models, as well as the properties of their element and the models of FEA are discussed. No nlinear analysis for reinfor ced concrete rigid-frame arch bridge containing carried out by using the lar gegeneral structural analysis softw are ANSYS. Geometric nonlinearity and material nonlinearity of members are also considered. The effects of different load dist ributions on the ultimate load-carrying capacity of the bridge are investigated. References | Related Articles | Metrics

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Accuracy analysis about pier shaft construction survey of sutong bridge ZHOU Xi-zhen，CAO Cao 2006, 25(5): 17-20.  Abstract ( )   PDF (155KB) ( )   In the construction of big type bridge. require higher precision of pier shaft construction survey. the paper about precision of polar coordinates method setting out pier shaft mould board and precision of the EDM trigonometric leveling method carry through pier tip height control and positioning pr ecision of pier axis as well as needed precision of pass control point of bridge axis carry through accuracy analysis and discuss. References | Related Articles | Metrics

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Key technological study of the construction of the joints of simply-supported girder bridges SHEN Jian-liang 2006, 25(5): 21-23.  Abstract ( )   PDF (422KB) ( )   The constr uction of the joints of simply-suppor ted girder bridges used in extension projects of expressways and the construction technology of the commonly used joints of both simply-supported plate girders and simply-supported T-beams will be studied. The technical requirements of joint design will be analyzed first. Then according to the requirements, the key technological study of the construction of the joints will be carried out. At the conclusion, the corresponding construction measures and proposals will be put forward. References | Related Articles | Metrics

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The theory analysis of two kinds of bridge rubber bearing for isolated function GUO Xiang-ming，XIAO Sheng-xie 2006, 25(5): 24-27.  Abstract ( )   PDF (189KB) ( )   In this paper , The normal rubber bearing(RB) and lead rubber bearing(LRB) are analyzed by applying designing principle of isolation on the basis of linar-elastic model. After pointing out the defect of normal rubber bearing(RB) , the authors mainly analyze key parameters, for example, primate stiffness、yield rigid、lead diameter and talk over the effects by key parameters on Isolated Function. In the end, we point out the advantage of lead rubber bearing(LRB) and how it overcomes the defect of normal rubber bearing(RB) . References | Related Articles | Metrics

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How to layout the south-north approach of lijiaotuo Changjiang River bridge Chongqing ZHAO Li-jie，CHEN Kun-lin，LIU Jun，CHEN Zuo-ming 2006, 25(5): 28-31.  Abstract ( )   PDF (194KB) ( )   The South-north Approach of Lijiatuo Changjiang River Bridge, Chongqing, is the main access co nnecting District Ba'nan with District Jiulong.However, the service level of this road is so bad that the frequency of traffic accident is very high,which influence the economic development of the district around the road. It's time to lay out it now.The author suggests a comparatively overall lay out plan from the seven aspects, subgrade, bridge deck,draining and soon. References | Related Articles | Metrics

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3-D numerical analysis of the flow pattern in the opening area of extra-long highway tunnel WEN Yu-hui，XIE Yong-li，LI Ning-jun 2006, 25(5): 32-36.  Abstract ( )   PDF (270KB) ( )   Based on the design of Qinling separ ated ex tra-long highway tunnel, this article mainly used CFD to analyze the flow pattern in the tunnel's opening area with the purpose to determine the character of the flow pattern and also this article raised some methods to reduce the cross infection in the tunnel's opening area. References | Related Articles | Metrics

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Avalanche control technology in fanjialing tunnel project DENG Ren-qing 2006, 25(5): 37-39.  Abstract ( )   PDF (186KB) ( )   Avalanche often appears in mountain tunnel excavation under the complex geological conditions. It could lead to heavy damage. The general situation of Fanjialing tunnel is introduced at first. Further the factors those affect avalanche are analyzed. According to these factors the treatment principle and scheme are both presented in paper. It obtain a good affect in Fanjialing tunnel project. References | Related Articles | Metrics

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Cartoon simulation analysis of illusion caused by highway alignment and roadside environments GUO Qian，WU Guo-xiong，WANG Fu-jian 2006, 25(5): 40-44.  Abstract ( )   PDF (925KB) ( )   The illusion sections on a highway are the most dangerous parts to cause traffic accidents. At first the dangerous highway sections of the illusion of the road are sorted. Meanwhile the main reasons that lead to all kinds of illusions are analyzed. Then the scenes of simple and living instances are chosen for demonstrating purposes. Based on that, the influences of the illusions on traffic safeties are analyzed. Finally basic steps and methods of making cartoons with 3dsmax are introduced———the scene modeling and fix ing, picture pasting,orbit movement controlling,image render ng and formatting and so on. References | Related Articles | Metrics

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Research on modulus determination of granular base of asphalt pavement ZHU Hong-hou，ZHENG He-ping，HE Zhao-yi，WU Guo-xiong 2006, 25(5): 45-48.  Abstract ( )   PDF (164KB) ( )   Resilient modulus of unbound granular mat erials is influenced str ongly by stress level. So pavement structure parameters must be taken into account in modulus det ermination. In this paper,the pavement structure parameters which influence the stress level and modulus of granular base were analyzed with orthogonal method. The results show that the module of subgrade and the thickness of asphalt face layer have important influence on modulus of granular base. Moreover, a modulus determination method of granular base according to structure parameters was developed by multiple regression, which is more rationally than experiential method. References | Related Articles | Metrics

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Design method of mother-asphalt-mixture for semi-flexible pavement HU Ling-ling，LIU Zhu-guo，ZHANG Da-ke，CHENG Chang-qing，WU Guo-xiong，FAN Tong-jiang 2006, 25(5): 49-53.  Abstract ( )   PDF (235KB) ( )   Semi-flexible pavement is generally described as a composition pavement that possess the cha racteristic of asphalt concrete and Portland cement concrete, which is filled with Portland cement grout in open??graded basic-asphalt-mixture. It is a void-closed framework structure. However, its basic-asphalt-mixture is framework-void texture. To make the basic-asphalt-mixture have good volume character and performance, based on the local condition of China and referring to the domestic-overseas study, the design method of basic-asphalt-mixture based on the orthogonal test design method is presented, which uses the void 19%~ 21%, Maxshell stability > 3MPa and fluid 40~ 55 as the design target value, through which the best range of mixture grade and asphalt contents have been acquired, and the validity of the design method has been validated by means of the test. References | Related Articles | Metrics