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15 December 2013, Volume 32 Issue 6 Previous Issue    Next Issue

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Influence of Ratio of Side-Span to Mid-Span and Length of Unsupported Deck on Static and Dynamic Performance of Single Pylon Cable-Stayed Bridges PU Qianhui,Zhao Hu 2013, 32(6): 1101-1105.  DOI: 10.3969/j.issn.1674-0696.2013.06.01 Abstract ( )   Based on the constructed single pylon cable-stayed main bridge o[ Shangzhongba Jialingjiang Bridge in Nanchong , finite element calculation models were estab!ished. Comparative calculation was carried out to tell the influence on the structure' s static and dynamic performance caused by two main factors , the ratio of side叩an to mid叩an and the length of unsupported deck. Bolh of them were analyzed separately to study the independent effect on the structure' s static and dynamic performance. Calculation results show that changes of the ratio of side-span to mid-span and the length of unsupported deck make an apparent contribution to the change of structure ' s static performance; however , the same changes make a !ittle contribution to inherent vibration characteristics. Conclusions are drawn to optimize the structure design of the cable-stayed bridge. References | Related Articles | Metrics

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Influence of Ratio of Side-Span to Mid-Span and Length of Unsupported Deck on Static and Dynamic Performance of Single Pylon Cable-Stayed Bridges PU Qianhui,Zhao Hu 2013, 32(6): 1101-1105.  DOI: 10.3969/j.issn.1674-0696.2013.06.01 Abstract ( )   PDF (339KB) ( )   Based on the constructed single pylon cable-stayed main bridge o[ Shangzhongba Jialingjiang Bridge in Nanchong , finite element calculation models were estab!ished. Comparative calculation was carried out to tell the influence on the structure' s static and dynamic performance caused by two main factors , the ratio of side叩an to mid叩an and the length of unsupported deck. Bolh of them were analyzed separately to study the independent effect on the structure' s static and dynamic performance. Calculation results show that changes of the ratio of side-span to mid-span and the length of unsupported deck make an apparent contribution to the change of structure ' s static performance; however , the same changes make a !ittle contribution to inherent vibration characteristics. Conclusions are drawn to optimize the structure design of the cable-stayed bridge. References | Related Articles | Metrics

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Environmental Effects on Modal Frequency of Long-Span Cable-Stayed Bridges Sun Limin , Zhou Yi , Xie Daqi 2013, 32(6): 1106-1110.  DOI: 10.3969/j.issn.1674-0696.2013.06.02 Abstract ( )   Based on the data of anemometer , thermometer and accelerometer accumulated from the Donghai Bridge Structural Health Monitoring System (DBSHMS) since 2007 , the correlation between the environmental or loading factors and the lower order modal frequencies of the main navigational channel blidge (MNCB) of Donghai Bridge was investigated. The results show that the strong wind , traffic loading and structural temperature have significant effects on the frequency variation , and these three factors dominate in different time scales. Compared with traffic and temperature factors , wind effects on frequency happen in a much shorter period , i. e. only during the strong wind process. Traffic load affects the frequency mainly in such cycles as 1 week , 1 day and maybe also 12 hours , while temperature dominates in the cycles like 1 year and 1 day. Traffic and wind loading may inf1uence the frequency in an indirect way by changing the vibration amplitude , and the explicit mechanism needs to be further studied. References | Related Articles | Metrics

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Environmental Effects on Modal Frequency of Long-Span Cable-Stayed Bridges Sun Limin , Zhou Yi , Xie Daqi 2013, 32(6): 1106-1110.  DOI: 10.3969/j.issn.1674-0696.2013.06.02 Abstract ( )   PDF (378KB) ( )   Based on the data of anemometer , thermometer and accelerometer accumulated from the Donghai Bridge Structural Health Monitoring System (DBSHMS) since 2007 , the correlation between the environmental or loading factors and the lower order modal frequencies of the main navigational channel blidge (MNCB) of Donghai Bridge was investigated. The results show that the strong wind , traffic loading and structural temperature have significant effects on the frequency variation , and these three factors dominate in different time scales. Compared with traffic and temperature factors , wind effects on frequency happen in a much shorter period , i. e. only during the strong wind process. Traffic load affects the frequency mainly in such cycles as 1 week , 1 day and maybe also 12 hours , while temperature dominates in the cycles like 1 year and 1 day. Traffic and wind loading may inf1uence the frequency in an indirect way by changing the vibration amplitude , and the explicit mechanism needs to be further studied. References | Related Articles | Metrics

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Optimization of Cable Forces of Cable-Stayed Bridges Based on MATLAB and ANSYS Software under Dead Loads Liu Yiming , Liu Dayang , Liu Shanhong 2013, 32(6): 1111-1114.  DOI: 10.3969/j.issn.1674-0696.2013.06.03 Abstract ( )   There were some defects in the optimization algorithm , when ANSYS software was applied in the optimization of initial cable forces of cable-stayed bridges under dead loads. Based on the condition mentioned above , a new optimization method of initial cable forces of cable-stayed bridges , which combined MATLAB with ANSYS , was proposed. Genetic algorithm in MATLAB optimization toolbox was used as the main optimization program to make ANSYS carry out the optimization calculation , which could improve the defects of ANSYS in the optimization of initial cable forces of cable-stayed bridges under dead loads. Eventually , the proposed method was applied to the optimization of initial cable forces of one cable-stayed bridge. Comparing the results with those of ANSYS first-order optimization method , the results show that the proposed method is effective and practical. References | Related Articles | Metrics

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Optimization of Cable Forces of Cable-Stayed Bridges Based on MATLAB and ANSYS Software under Dead Loads Liu Yiming , Liu Dayang , Liu Shanhong 2013, 32(6): 1111-1114.  DOI: 10.3969/j.issn.1674-0696.2013.06.03 Abstract ( )   PDF (367KB) ( )   There were some defects in the optimization algorithm , when ANSYS software was applied in the optimization of initial cable forces of cable-stayed bridges under dead loads. Based on the condition mentioned above , a new optimization method of initial cable forces of cable-stayed bridges , which combined MATLAB with ANSYS , was proposed. Genetic algorithm in MATLAB optimization toolbox was used as the main optimization program to make ANSYS carry out the optimization calculation , which could improve the defects of ANSYS in the optimization of initial cable forces of cable-stayed bridges under dead loads. Eventually , the proposed method was applied to the optimization of initial cable forces of one cable-stayed bridge. Comparing the results with those of ANSYS first-order optimization method , the results show that the proposed method is effective and practical. References | Related Articles | Metrics

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Spatial Analysis on Mechanical Behavior of Half-Bridge and Slope Base Composite Embankment Structures Cui Xuechang，Zhang Jiangtao，Zheng Wen 2013, 32(6): 1115-1118.  DOI: 10.3969/j.issn.1674-0696.2013.06.04 Abstract ( )   At steep mountainous area，to avoid the serious damage of the ecological environment in road widening and reconstruction， a kind of half-bridge and slope base composite embankment structure was proposed，which consisted of the reinforced concrete frame structure leaning upon the inner road embankment and superstructure for traffic． By establishing the spatial FFM entity model of half-bridge and slope base composite embankment structure，the force transmission mechanism of this kind of structure under the loading was investigated． And the mechanical behavior of composite structure under different geological conditions were also studied． Ｒesults show that when the half-bridge and slope base composite embankment structure strengthens the lateral road， the inner slope is also strengthened at the same time． References | Related Articles | Metrics

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Spatial Analysis on Mechanical Behavior of Half-Bridge and Slope Base Composite Embankment Structures Cui Xuechang，Zhang Jiangtao，Zheng Wen 2013, 32(6): 1115-1118.  DOI: 10.3969/j.issn.1674-0696.2013.06.04 Abstract ( )   PDF (337KB) ( )   At steep mountainous area，to avoid the serious damage of the ecological environment in road widening and reconstruction， a kind of half-bridge and slope base composite embankment structure was proposed，which consisted of the reinforced concrete frame structure leaning upon the inner road embankment and superstructure for traffic． By establishing the spatial FFM entity model of half-bridge and slope base composite embankment structure，the force transmission mechanism of this kind of structure under the loading was investigated． And the mechanical behavior of composite structure under different geological conditions were also studied． Ｒesults show that when the half-bridge and slope base composite embankment structure strengthens the lateral road， the inner slope is also strengthened at the same time． References | Related Articles | Metrics

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Application of the Improved Hilbert-Huang Transformation to CFST Cavity Detection Han Xi，Wang Ji, Zhong Li, Xiang Li 2013, 32(6): 1119-1121.  DOI: 10.3969/j.issn.1674-0696.2013.06.05 Abstract ( )   In CFST cavity detection test , Hilbert-Huang transformation was used to collect and analyze the sound , which was nonlinear and non-stationary signal. Empirical mode of the original signal was decomposed into the intrinsic mode function (IMF) components , and then Hilbert Transformation of IMF component was carried out. However , IMF components decomposed from the empirical mode decomposition may include a portion of false components. So Kolmogorov-Smimov fiuing goodness inspection test method was used to distinguish the similar probabilities of each IMF component and the original signal after decomposition. Furthermore , false components were got rid of. Finally , IMF components , whose similar probability was relatively high , were applied to get a reasonable Hilbert marginal spectrum. IMF components accurately reflect the local characteristics of the structure , and effectively realize CFST cavity detection. References | Related Articles | Metrics

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Application of the Improved Hilbert-Huang Transformation to CFST Cavity Detection Han Xi，Wang Ji, Zhong Li, Xiang Li 2013, 32(6): 1119-1121.  DOI: 10.3969/j.issn.1674-0696.2013.06.05 Abstract ( )   PDF (349KB) ( )   In CFST cavity detection test , Hilbert-Huang transformation was used to collect and analyze the sound , which was nonlinear and non-stationary signal. Empirical mode of the original signal was decomposed into the intrinsic mode function (IMF) components , and then Hilbert Transformation of IMF component was carried out. However , IMF components decomposed from the empirical mode decomposition may include a portion of false components. So Kolmogorov-Smimov fiuing goodness inspection test method was used to distinguish the similar probabilities of each IMF component and the original signal after decomposition. Furthermore , false components were got rid of. Finally , IMF components , whose similar probability was relatively high , were applied to get a reasonable Hilbert marginal spectrum. IMF components accurately reflect the local characteristics of the structure , and effectively realize CFST cavity detection. References | Related Articles | Metrics

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Degradation Mechanism , Reliability Assessment and Multi-Objective Optimization of Maintenance Strategies of Existing Reinforced Concrete Bridge Zhang Jianren , Hu Shouwang , Peng Jianxin 2013, 32(6): 1123-1127.  DOI: 10.3969/j.issn.1674-0696.2013.06.06 Abstract ( )   The rapid corrosion of components , real bridge component bearing capacity test and destructive test of bridge were used to reveal the degradation mechanism of the RC bridge under corrosive environment by means of surface detection , def1ection test and so on. Considering the randomness and time-varying of corrosion parameters , RC bridge model was established in the time-varying reliability of corrosive environment , and the failure probability and the corrosive cracking ratio of RC bridge in the atmosphere environment of were calculated. On this basis , with the consideration of maintenance cost model , RC bridge maintenance and reinforcement of multi-objective optimization objective function and constraint conditions were constructed. The bridge deck' s maintenance practice was used to prove the rationality of the proposed method. References | Related Articles | Metrics

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Degradation Mechanism , Reliability Assessment and Multi-Objective Optimization of Maintenance Strategies of Existing Reinforced Concrete Bridge Zhang Jianren , Hu Shouwang , Peng Jianxin 2013, 32(6): 1123-1127.  DOI: 10.3969/j.issn.1674-0696.2013.06.06 Abstract ( )   PDF (401KB) ( )   The rapid corrosion of components , real bridge component bearing capacity test and destructive test of bridge were used to reveal the degradation mechanism of the RC bridge under corrosive environment by means of surface detection , def1ection test and so on. Considering the randomness and time-varying of corrosion parameters , RC bridge model was established in the time-varying reliability of corrosive environment , and the failure probability and the corrosive cracking ratio of RC bridge in the atmosphere environment of were calculated. On this basis , with the consideration of maintenance cost model , RC bridge maintenance and reinforcement of multi-objective optimization objective function and constraint conditions were constructed. The bridge deck' s maintenance practice was used to prove the rationality of the proposed method. References | Related Articles |