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15 June 2004, Volume 23 Issue 3 Previous Issue    Next Issue

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Research on reinforcing and repairing of a long-span bi-curved arch bridge ZHOU Zhi-xiang, HE Peng, ZHAO Chan-hui 2004, 23(3): 1-4.  Abstract ( )   PDF (161KB) ( )   A method to strengthen a bi- curved arch bridge is presented according to the damage situation of the bridge. Three measures of enlarging the local sections, strengthning the bracings and changing the form of super-structure are used to avoid the trouble of repairing the whole main-arch. The method has been successfully applied in the rehabilitation of Daning River bridge and presented remarkable social and economic benefits References | Related Articles | Metrics

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Mechanism and factor analysis of concrete carbonation and resulted reduction of RC bridge service lives ZHANG Guang-shan, ZHAO Hua, MENG Yun 2004, 23(3): 5-9.  Abstract ( )   PDF (171KB) ( )   More and more scholars and states are paying intensive attention to the study of service lives of reinforced concrete (RC) bridges.The factors affecting the service life are diverse. According to the latest research progress home and aboard, the paper discusses the main factors affecting the service life-concrete carbonation ,and synthetizes the factors affecting carbonation in 3 aspects: material,enviormental actions and construction, at last, gives some effective advices and measures References | Related Articles | Metrics

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Evaluation of the effect of collapse in top area of a double-arched tunnel on its the secondary lining WANG Sheng-hui, DU Xiao-ping, YUAN Yong, ZHANG Yong-wu, DU Guo-ping 2004, 23(3): 10-12.  Abstract ( )   PDF (170KB) ( )   Based on the analysis of the reason of the collapse in top area of a double-archde tunnel,FEM means is taken to study the bad effect of collapse loads and some other facotrs on the secondary lining,then some good advices are suggested for tunnel design and construct References | Related Articles | Metrics

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The treatments of trickling water after secondary lining of biconnected arch tunnels TANG Liang, PAN Chen-hai 2004, 23(3): 13-17.  Abstract ( )   PDF (177KB) ( )   Trickling water frequently occurs in the outside appearance of biconnected arch tunnels after the secondary lining, influencing their construction quality and operating. In the construction of biconnected arch tunnels in Tongyou Mountain Tunnel, Yinzi Mountain Tunnel No.1, Yinzi Mountain Tunnel No.2 in South Second Ring Road in city of Liouzhou in Guangxi Zhuangzu Autonomous Region, in the light of comprehensive treatments "combining blinding with draining, couple rigidity with flexibility, mult References | Related Articles | Metrics

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Analysis of the causes for uneven settlement of intermediate piers of multi-span simple bridges TANG Lin, ZHONG Chuan-jian 2004, 23(3): 18-20.  Abstract ( )   PDF (111KB) ( )   Through the investigation of such factors relating to the settlement of intermediate piers of simple beam bridges as structural self-weight,vehicle loads, pier deformation, foundation settlement and soil compaction,the paper points out, the main causes for the uneven settlement of intermediate piers,providing useful referencd for the intensifying attention to the pier groundwork References | Related Articles | Metrics

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A new simplified method of calculating pier′s crack width under eccentric load GAO Yan-mei, LIU Dong, ZHOU Zhi-xiang 2004, 23(3): 21-23.  Abstract ( )   PDF (153KB) ( )   Based on discussing the method of calculating cylinder pier′s crack width under eccentric load in the new Specifications for Design of Reinforced Concrete′s and Prestressed Concrete′s Highway Bridge and Culverts,and the method of using traditional nominal tension stress to calculating it indirectly, we have first brought forth a new simplified method to calculate cylinder pier′s crack width directly by using nominal tension stress, and then verified the data frequently used in engineering. The p References | Related Articles | Metrics

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The study on impact performance of flexible fibers concrete YANG Qing-guo 2004, 23(3): 24-26.  Abstract ( )   PDF (125KB) ( )   There is not uniform criterion to study the impact performance of concrete materials nowadays. In order to investigate the performance of flexible fibers concrete, pendulum-hammer impact experiment and fall-weight impact experiment were carried out in laboratory. The experimental results show that flexible fibers concrete has more excellent impact performance than traditional concrete, and the application of flexible fibers concrete in pavement can improve the pavement capacity to resist the imp References | Related Articles | Metrics

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The relationship between the construction thickness of surface and the maximum particle-size of asphalt concrete LI Jian, HAO Pen-wen, YIN Jing-ze, LI li 2004, 23(3): 27-31.  Abstract ( )   PDF (1556KB) ( )   The relationship between the construction thickness of structure course and the maximum particle-size of asphalt concrete is one of the factors that affected the compaction capacity of mixture. Based on the compaction capacity and performance, the laboratory tests on the proper ratio were carried on. The results showed that when the proper ratio is 2.5,the asphalt pavement has better performance References | Related Articles | Metrics

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Calculation and application of effective temperature of asphalt mixture LI Jing, DAI Jing-liang 2004, 23(3): 32-36.  Abstract ( )   PDF (184KB) ( )   According to the two main defects of fatigue and rutting of asphalt pavement, the paper analyzes the effect of temperature on asphalt mixture and pavement design. Based on the fatigue and rutting tests of asphalt mixture, the principle of equivalent damage and weather data of Shanxi Province, the paper calculates the fatigue and rut effective temperature of asphalt mixture for typical regions in Shanxi, and makes a reference for asphalt pavement design References | Related Articles | Metrics

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SASW used in quality assurance for performance of highway subgrade LU Ming-kang, GU Xiao-an, TEN Yu-min, SHI Ming-lei 2004, 23(3): 37-40.  Abstract ( )   PDF (164KB) ( )   The spectral analysis of surface waves system on site testing for performance of highways subgrade is discussed in this paper. On the basis of the modulus of resilience tested on site, the mechanical performance of highways subgrade was investigated in a systematical way by the Rayleigh Wave test, bending test, field CBR and loading plate test. Using statistics, an empirical relation between Rayleigh Wave velocity and modulus of resilience for highways subgrades is established, and the validity References | Related Articles | Metrics

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simplified strength criterion for concrete under biaxial stresses XU Yong, ZHOU Zhi-xiang, ZHOU Rui, GAO Yan-mei 2004, 23(3): 41-44.  Abstract ( )   PDF (145KB) ( )   In the analyses of concrete structures, the strength criterion for concrete under biaxial stresses is applied frequently. But in fact, there is some discordance in accuracy among some existing strength criteria and their expressions are relatively fussy. Refering to code for design of concrete structures (GB50010-2002), the paper gains a unilateral Bernoulli’s lemniscate through fitting of a curve on the basis of analysis of document .In comparison with other strength criteria for concrete under References | Related Articles | Metrics

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An improved multi-factor equation of concrte carbonation CHEN Wei, ZHOU Zhi-xiang, XIANG Yang-kai 2004, 23(3): 45-47.  Abstract ( )   PDF (136KB) ( )   Some main carbonation models of concrete with multi-factors are analyzed comparatively. Through combination of the recent research and the existent models, an improved model involing the environment factors and the density of CO2 is presented. The results of it match the tested engineering data better. Further more, some conclusions and suggestions are made in the end References | Related Articles | Metrics

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Analysis applying 3D damage FEM on the formation mechanism of RC box-culvert cracks(1) WANG Kai, CHEN Hong-kai, LI Li, ZHOU Xiao-liang, WANG Yi-jun 2004, 23(3): 49-52.  Abstract ( )   PDF (141KB) ( )   The paper tried to couple Damage theory with 3D FEM(ie. Damage FEM), and applied to analysis of whole structure’s damage. Define new Degree of Damage with strain as varies of damage. On the basis of this, modify the equation of J.Mazars and build the new damage equation. Ulteriorly form a checkout method. Using the method to analyse mechanism of box-culvert’s cracks formation in Shabin Road in Chongqing. Developing the method is significant for damage theory being applied to engineering practice References | Related Articles | Metrics

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Analysis appling 3D damage FEM on the formation mechanism of RC box-culvert cracks(2) WANG Kai, CHEN Hong-kai, LI Li, WANG Yi-jun, ZHOU Xiao-linag 2004, 23(3): 53-56.  Abstract ( )   PDF (198KB) (