TIME-DEPENDENT BEHAVIOR OF CANTILEVER LIGHT WEIGHT CONCRETE BRIDGE BASED ON TENDON AND LIGHT WEIGHT CONCRETE TYPES
The balanced cantilever construction of pre-stressed concrete box-girder bridges has been recognized as one of the most efficient methods of bridge construction. This method has...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | fas |
| Published: |
Sharif University of Technology
2019-05-01
|
| Series: | مهندسی عمران شریف |
| Subjects: | |
| Online Access: | https://sjce.journals.sharif.edu/article_20856_d6496744846ed612a16faf79b2bab2c8.pdf |
| _version_ | 1797738709151383552 |
|---|---|
| author | A. Abasi A.R. Rahai Sh. Tahouni |
| author_facet | A. Abasi A.R. Rahai Sh. Tahouni |
| author_sort | A. Abasi |
| collection | DOAJ |
| description | The balanced cantilever construction of pre-stressed concrete box-girder bridges has been recognized as one of the most efficient methods of bridge construction. This method has great advantages over other methods, especially in urban areas where traffic may be interrupted, or over deep valleys or waterways where formwork could be expensive and hazardous. Time-dependent deformation of materials has adverse effects on balanced cantilever bridges. The time-dependent concrete creep and shrinkage effects on segmental bridges are more critical than other types of concrete bridges. An increase in time-dependent deformation of concrete leads to the reduction of pre-stressing force of cables and affecting the service ability of the balanced cantilever bridges. The combined effects of creep and shrinkage of concrete and relaxation of pre-stressing tendons cause gradual changes in the internal forces and deflections of span. Despite a wide range of applications of balanced cantilever light-weight concrete bridges with longer spans, there is no sufficient knowledge about the time-dependent behavior of light-weight concrete. In this study, time-dependent analyses of balanced cantilever light-weight concrete bridges are carried out by considering the creep and shrinkage of light-weight concrete and relaxation of pre-stressing cables. Stolma bridge field experimental results are used to verify the analysis method. ABAQUS software capabilities are utilized to consider the step-by-step construction procedure, so the suitable simulation of the bridge lifetime is achieved. The numerical study is performed for one, three, five and thirty years after the completion of construction procedure. A parametric study is conducted based on three types of concrete LC60, LC40, and LC25 as well as two types of behavior of steel, normal relaxation and low (TRB) relaxation. The results demonstrate that time-dependent deformations have considerable effect on lifetime behavior of light-weight concrete bridge. Most of the time-dependent deformation happened in early years after the completion of construction procedure of the bridge. The parametric study showed the identical
results of contribution of creep, shrinkage and relaxation effects on the deflection of the middle span for different types of concrete. The effect of relaxation on the deflection of the middle span is negligible for relaxation cables. |
| first_indexed | 2024-03-12T13:47:45Z |
| format | Article |
| id | doaj.art-1be963d0f5c24e1ab15553d42c4a60a7 |
| institution | Directory Open Access Journal |
| issn | 2676-4768 2676-4776 |
| language | fas |
| last_indexed | 2024-03-12T13:47:45Z |
| publishDate | 2019-05-01 |
| publisher | Sharif University of Technology |
| record_format | Article |
| series | مهندسی عمران شریف |
| spelling | doaj.art-1be963d0f5c24e1ab15553d42c4a60a72023-08-23T08:04:14ZfasSharif University of Technologyمهندسی عمران شریف2676-47682676-47762019-05-0135.21.110110910.24200/j30.2018.1908.201320856TIME-DEPENDENT BEHAVIOR OF CANTILEVER LIGHT WEIGHT CONCRETE BRIDGE BASED ON TENDON AND LIGHT WEIGHT CONCRETE TYPESA. Abasi0A.R. Rahai1Sh. Tahouni2Civil and Environmental Engineering Amirkabir University of TechnologyCivil and Environmental Engineering Amirkabir University of TechnologyCivil and Environmental Engineering Amirkabir University of TechnologyThe balanced cantilever construction of pre-stressed concrete box-girder bridges has been recognized as one of the most efficient methods of bridge construction. This method has great advantages over other methods, especially in urban areas where traffic may be interrupted, or over deep valleys or waterways where formwork could be expensive and hazardous. Time-dependent deformation of materials has adverse effects on balanced cantilever bridges. The time-dependent concrete creep and shrinkage effects on segmental bridges are more critical than other types of concrete bridges. An increase in time-dependent deformation of concrete leads to the reduction of pre-stressing force of cables and affecting the service ability of the balanced cantilever bridges. The combined effects of creep and shrinkage of concrete and relaxation of pre-stressing tendons cause gradual changes in the internal forces and deflections of span. Despite a wide range of applications of balanced cantilever light-weight concrete bridges with longer spans, there is no sufficient knowledge about the time-dependent behavior of light-weight concrete. In this study, time-dependent analyses of balanced cantilever light-weight concrete bridges are carried out by considering the creep and shrinkage of light-weight concrete and relaxation of pre-stressing cables. Stolma bridge field experimental results are used to verify the analysis method. ABAQUS software capabilities are utilized to consider the step-by-step construction procedure, so the suitable simulation of the bridge lifetime is achieved. The numerical study is performed for one, three, five and thirty years after the completion of construction procedure. A parametric study is conducted based on three types of concrete LC60, LC40, and LC25 as well as two types of behavior of steel, normal relaxation and low (TRB) relaxation. The results demonstrate that time-dependent deformations have considerable effect on lifetime behavior of light-weight concrete bridge. Most of the time-dependent deformation happened in early years after the completion of construction procedure of the bridge. The parametric study showed the identical results of contribution of creep, shrinkage and relaxation effects on the deflection of the middle span for different types of concrete. The effect of relaxation on the deflection of the middle span is negligible for relaxation cables.https://sjce.journals.sharif.edu/article_20856_d6496744846ed612a16faf79b2bab2c8.pdfbridgebalanced cantilever methodlight-weight concretetime-dependent behaviorcreepshrinkagerelaxation of pre-stressing cables and redistributed of force |
| spellingShingle | A. Abasi A.R. Rahai Sh. Tahouni TIME-DEPENDENT BEHAVIOR OF CANTILEVER LIGHT WEIGHT CONCRETE BRIDGE BASED ON TENDON AND LIGHT WEIGHT CONCRETE TYPES مهندسی عمران شریف bridge balanced cantilever method light-weight concrete time-dependent behavior creep shrinkage relaxation of pre-stressing cables and redistributed of force |
| title | TIME-DEPENDENT BEHAVIOR OF CANTILEVER LIGHT WEIGHT CONCRETE BRIDGE BASED ON TENDON AND LIGHT WEIGHT CONCRETE TYPES |
| title_full | TIME-DEPENDENT BEHAVIOR OF CANTILEVER LIGHT WEIGHT CONCRETE BRIDGE BASED ON TENDON AND LIGHT WEIGHT CONCRETE TYPES |
| title_fullStr | TIME-DEPENDENT BEHAVIOR OF CANTILEVER LIGHT WEIGHT CONCRETE BRIDGE BASED ON TENDON AND LIGHT WEIGHT CONCRETE TYPES |
| title_full_unstemmed | TIME-DEPENDENT BEHAVIOR OF CANTILEVER LIGHT WEIGHT CONCRETE BRIDGE BASED ON TENDON AND LIGHT WEIGHT CONCRETE TYPES |
| title_short | TIME-DEPENDENT BEHAVIOR OF CANTILEVER LIGHT WEIGHT CONCRETE BRIDGE BASED ON TENDON AND LIGHT WEIGHT CONCRETE TYPES |
| title_sort | time dependent behavior of cantilever light weight concrete bridge based on tendon and light weight concrete types |
| topic | bridge balanced cantilever method light-weight concrete time-dependent behavior creep shrinkage relaxation of pre-stressing cables and redistributed of force |
| url | https://sjce.journals.sharif.edu/article_20856_d6496744846ed612a16faf79b2bab2c8.pdf |
| work_keys_str_mv | AT aabasi timedependentbehaviorofcantileverlightweightconcretebridgebasedontendonandlightweightconcretetypes AT arrahai timedependentbehaviorofcantileverlightweightconcretebridgebasedontendonandlightweightconcretetypes AT shtahouni timedependentbehaviorofcantileverlightweightconcretebridgebasedontendonandlightweightconcretetypes |