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20 February 2008, Volume 27 Issue 1 Previous Issue    Next Issue

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Analysis of Cracks in Reinforced Concrete Block of Curved Girders WU Xuan-tao, ZHOU Zhi-xiang, ZENG Fan-jiang 2008, 27(1): 1-4.  Abstract ( )   PDF (265KB) ( )   The reasons for the cracks in the reinforced concrete block of curved girders were analyzed, and the formula for calculating the stress of reinforced concrete block under the effect of centrifugal force of cars was provided through the finite element software ANSYS. The measures to avoid the reinforced concrete block from cracking were discussed, which could provide the baseline for the design and construction of the reinforced concrete block. Related Articles | Metrics

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Damage Identification of Existed Multi-Girders Highway Bridges SHAN De-shan, LI Qiao, WANG Yu-jue 2008, 27(1): 5-8,16.  Abstract ( )   PDF (391KB) ( )   The damage identification method using the dynamically measured flexibility matrix to locate damages was studied. The changes in flexibility and flexibility curvature methods are adopted to identify damage. The qualitative analysis of testing noise on the detected result was also carried out. The multi -girder model that matches the real configuration of bridge structure was adopted to simulate the bridge damage. One numerical example analysis of a simplesupported multi-girders bridge was presented to demonstrate the effectiveness of the proposed methods. It is shown that the proposed approach has the potential of being a practical tool for a damage detection methodology applied to smart civil structures due to its excellent capability in dealing with the few measured mode shapes and frequencies. Related Articles | Metrics

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Creep Simulation Analysis of Baiguodu Jialing River Bridge WANG Wei-hong, WANG Yun-tao, CHEN Yu-feng, XU Zhen 2008, 27(1): 9-12.  Abstract ( )   PDF (273KB) ( )   The theory of metal creep is used to infer to the creep calculation of the concrete structure. Under the second development of the ANSYS programme, the concrete creep was replaced by the metal creep, and creep calculative procedure was worked out.The creep simulation analysis of the Baiguodu Jialing River Bridge for 30 years after completion has been realiz ed successfully, and the method and conclusions reached can be as reference. Related Articles | Metrics

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Analysis and Application of Grillage Method to Curved Girder Bridge ZHANG Fa-chun, YANG Chang-zheng 2008, 27(1): 13-16.  Abstract ( )   PDF (248KB) ( )   The grillage method is an analytical method of space structure which can simulate the original structure well, and it owns characteristics of clear basic conception and low computing cost. Therefore, it is often applied to the design of the wider, skew, curved girder bridges. The basic theory of the grillage of boxing section was introduced in detail and the solid element of ANSYS was used to verify the practicability, with the hope to supply useful reference on the grillage theory and application to designers. Related Articles | Metrics

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Completing Design Calculation and Charting for Arch Bridge by VBA LIU Guo-dong, ZHANG Min, LUO Dong 2008, 27(1): 17-19,104.  Abstract ( )   PDF (305KB) ( )   AutoCAD is widely applicated to bridge designs and auxiliary model establishment of structure analysis. Some definitions and creation methods of AutoCAD drawing objectives are introduced. Using the VBA procedure, an arch bridge design program which was composed of design, internal force calculation and drawing was developed. Finally, the environment and the operation procedure needed by VBA are described. Related Articles | Metrics

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Minimum Thickness of Reinforcing Layer of Stone Arch Bridge Strengthened by Section Enlargement Method LIU Qing-yang, ZHOU Jian-ting, WANG Ling, ZHU Xiao-long 2008, 27(1): 20-23.  Abstract ( )   PDF (280KB) ( )   Based on the allowable stress theory, considering the stress characteristics of reinforcing layer before and after reinforcement, and guaranteeing the reinforcing layer and the original structure distortion coordination as a premise, a equation about reinforcing layer thickness section destruction was established before reinforcement to determine the reasonable thickness of reinforcing layer. It provides the theory basis to guarantee the reinforcement structure works, reduces the trial calculation and the checking calculation work load, and promotes the theory development of stone arch bridge structure reinforcement. Related Articles | Metrics

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Research and Analysis of Reinforced Method for Box Ribbed Arch Bridge LI Li-feng, SHAO Xu-dong, ZHANG Yang, LI Xian-chao 2008, 27(1): 24-27.  Abstract ( )   PDF (271KB) ( )   Many cracks appear in a deck type box arch bridge, and the load test reveals that the rigidity is a little lower and dynamic response coefficient is a little higher for the bridge. A reinforced method of setting cross bracing between arches was suggested in order to enhance the transverse rigidity and structural integrality. The internal forces were analyzed pre and after reinforcement with the spatial grillage method. The analytical results reveal that about 20 percents of internal forces under the action of live load are reduced after cross bracing placed. The effect is obviously. This technique can be used in the same kind of bridges. Related Articles | Metrics

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Construction Control of Caiyuanba B Ramp Continuous Rigid Frame Bridge CHEN Si-tian, WANG Zhi-peng, LIU Peng, YUAN Yuan 2008, 27(1): 28-31,36.  Abstract ( )   PDF (300KB) ( )   The construction control of continuous rigid frame bridges which were constructed by the segmental cantilever method were studied in the light of engineering practice-Caiyuanba B Ramp Bridge, and the feasible control methods were proposed. Furthermore, influences on shrinkage and creep of the large-span bridge during its service was specially analyzed. An additional camber is considered and advised. The better connecting precision is reached, and the smooth linetype of the bridge can be formed. Related Articles | Metrics

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Method to Determine Construction Cable Tension Force of Cable-Stayed Bridge YANG Xuan, ZHOU Shui-xing 2008, 27(1): 32-36.  Abstract ( )   PDF (324KB) ( )   A practical method named as differential method to determine construction cable tension force of cable-stayed bridge was proposed. It only applies to the forward-calculation according to the construction steps. By eliminating the gap between the aimed optimum cable tension force and the cable tension force which have been calculated through the construction steps, the construction cable tension force will be got. The disadvantages often appearing in the traditional back-analysis method such as concrete shrinkage, creep and geometric non-linearity can be avoided easily. Meanwhile,an approximate law to accelerate convergence was given, and a comparison between differential method and influence matrix method was made. This method has been applied in an actual bridge structural analysis. The results show that it is feasible and effective. Related Articles | Metrics

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Study on Calculation Theory of Tunnel System Bolt Design WANG Cheng 2008, 27(1): 37-39.  Abstract ( )   PDF (184KB) ( )   Most of tunnel system bolt design are analogical between each other without any consideration of the effect of surrounding rock. Taking tunnel surrounding rock and supporting as an unifier,a surrounding rock -support system was built up to join in work. Through bearing-load arch theory, and calculation theory study of tunnel system bolt, the certain parameters were ascertained to reduce the cost of construction. Related Articles | Metrics

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Study on Minimum Longitudinal Distance of Jet Fan in Ventilation of Highway Tunnel YANG Xiu-jun, WANG Xiao-wen, CHEN Jian-zhong 2008, 27(1): 40-43,164.  Abstract ( )   PDF (331KB) ( )   The minimum horizontal distance of jet fan is important for jet fan to operate properly and economically. Through the analysis of work principle of jet fan and the air flow in the tunnel based on jet mechanics, the approach of the minimum horizontal distance of jet fan was got. Through the engineering analogy and numerical simulation of the CFD, this method for making sure the minimum longitudinal distance are accordant with the real situation. It can be reference to make sure the minimum longitudinall distance of jet fan. Related Articles | Metrics

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Application of NATM Principle to Deformation Monitoring of Shilongshan Tunnel Surrounding Rock LIU Shan-hong, LIU Yi, LI Fang 2008, 27(1): 44-48,156.  Abstract ( )   PDF (405KB) ( )   New Austrian Tunneling Method (NATM) has been widely used in dynamic monitoring and controlling of Tunnel construction. Taking Shilongshan Tunnel construction as an example, the processes applying NATM to monitoring the surrounding rock deformation stability, stress variations and shoring control were detailedly presented. Some adjustment based on the analyses of measured data was maken. The results of the application indicates that the method is efficient in controlling the stability of the surrounding rock during the tunnel construction, and it cost effectively with improved construction safety. Related Articles | Metrics

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Study on Geometric Design of Left-Turn Lane in Grade Intersection ZHANG Lan-fang, MAO Ying-ping, FANG Shou-en 2008, 27(1): 49-52,117.  Abstract ( )   PDF (353KB) ( )   Aming at the design method of left-turn lane in highway intersection, referring to the design guides in developed countries, the deficiencies in the design guide of our country were analyzed. The layout designing, width and length defining and transitional section designing of the left-turn lane were studied in detail. The geometric design method of le ft-turn lane in the highway intersection is suggested. Related Articles | Metrics

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Structural Response on Superelevation Sections of Asphalt Pavement XIAO Xing-qiang, ZHANG Li-hong, AI Chang-fa, QIU Yan-jun 2008, 27(1): 53-56.  Abstract ( )   PDF (279KB) ( )   Centrifugal force, which is ignored in general design procedures, exists and affects pavement when vehicles pass by the superelevation sections of asphalt pavement. The mechanical characteristics of superelevation sections and equations of unequal load distribution were deduced. To illustrate the influences, a typical highway pavement was modeled by finite element method. Then quantificational analyses of structural response under different velocity were conducted. Analyses in dicate that structural responses are serious when the influence of centrifugal force is taken into consider. The higher velocity, the more influences. So, both the influences of centrifugal force and the insufficiency of general design procedures are responsi