INFLUENCE FROM STIFFNESS OF LONGITUDINAL RESTRAINT ON STRUCTURAL BEHAVIOURS OF CONCRETE BRIDGE DECK SLABS REINFORCED WITH GFRP BARS WITH ARCHING ACTION

Abstract

Abstract: When concrete bridge deck slabs were restrained by components aside,arching action existed and restraint force acted at arching feet in longitudinal direction of slabs. In order to investigate the influence from various stiffness of restraint on slabs' structural behaviours,six slabs with rotational restraint and longitudinal restraint at both ends were loaded until failed. It showed that as stiffness of restraint rose,restraint force increased,which enhanced the compressive area and reduced strains of GFRP bars. As a result,development of deflection at central span and cracks was slowed down,and serviceability and ultimate bearing capacity of slabs were both improved.Base on the former research,influence from longitudinal restraint on height of compressive area was quantified and restraint force was deduced. The estimated restraint forces were close to test results. And the conclusion was drawn that when proportion of restraint stiffness to compressive stiffness of slab in longitudinal direction was 0. 25 to 2. 00,longitudinal restraint would obviously improve structural behaviours of slab.

Key words: arching action, GFRP bars, concrete bridge deck slabs, stiffness of restraint

CLC Number:

LI Chun-hong, ZHENG Yu, WEI De-min. INFLUENCE FROM STIFFNESS OF LONGITUDINAL RESTRAINT ON STRUCTURAL BEHAVIOURS OF CONCRETE BRIDGE DECK SLABS REINFORCED WITH GFRP BARS WITH ARCHING ACTION[J]. COMPOSITES SCIENCE AND ENGINEERING, 2013, 0(3): 47-52.

References

[1] JTG D62-2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[2] ACI440. 1-06,Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars[S].
[3] 王作虎,杜修力,詹界东,邓宗才. FRP 筋混凝土梁抗剪性能的研究进展[J]. 玻璃钢/复合材料, 2010,(1): 82-88.
[4] 邓宇,张鹏,李冰. FRP 筋混凝土梁正截面承载力计算方法的研究[J]. 玻璃钢/复合材料, 2009,(3): 6-7.
[5] Brahim Benmokrane,EhabEl-Salakawy and AmrEl-Ragaby,et al. Designing and Testing of Concrete Bridge Decks[J]. American Society of Civil Engineers Journal of Bridge Engineering,2006,11(2): 217-229.
[6] Brahim Benmokrane,Ehab El-Salakawy and Sherif El-Gamal,et al. Construction and Testing of An Innovative Concrete Bridge Deck Totally Reinforced with Glass FRP Bars: Val-Alain Bridge On Highway 20 East[J]. American Society of Civil Engineers Journal of Bridge Engineering,2007, 12(5): 632-645.
[7] 潘云锋,郑愚,于国友. 对FRP 筋混凝土桥梁面板承载力性能的非线性有限元分析[J]. 玻璃钢/复合材料, 2011,(3): 13-19.
[8] 李春红,魏德敏,郑愚. GFRP 筋混凝土板在拱效应下的挠度计算[J]. 江苏大学学报,2012,33(4): 474-479.
[9] E. L. McDowell,K. E. MvKeeand andE. Sevin. Arching Action Theory of Restrained Masonry Walls[J]. American Society of Civil Engineers Journal of Structural Engineering,1956,82 (ST2 ): 915-1-915-18.
[10] G. I. B. Rankin and A. E. Long. Arching Action Strength Enhancement in Laterally Restrained Slab Strips[J]. Institution of Civil Engineers Proceedings-Structures and Buildings,1997,122:461-467.
[11] SherifEl-Gamal,Ehab El-Salakawy and Brahim Benmokrane. Influence of Reinforcement on the Behavior of Concrete Bridgedeck Slabs Reinforced with FRP Bars[J]. American Society of Civil Engineers Journal of Composites for construction,2007, 11(5): 449-458.
[12] O. Shervan Khanna,Aftab A. Mufti,and Baidar Bakht. Experimental Investigation of the Role of Reinforcement in the Strength of Concrete Deck Slabs[J]. Canadian Journal of Civil Engineering,2000,27: 475-480.
[13] S. E. Taylor,G. I. B. Rankin and D. J. Cleland. Arching Action in High Strength Concrete Slabs[J]. Institution of Civil Engineers Proceedings-Structures and Buildings,2001,146(4): 353-362.
[14] S. E. Taylor,G. I. B. Rankin and D. J. Cleland. Real Strength of High-Performance Concrete Bridge Deck Slabs[J]. Institution of Civil Engineers Proceedings-Bridge Engineering,2003, 156(BE2):81-90.
[15] Zheng Yu,Su Taylor and Des Robinson, et al. Investigation of Ultimate Strength of Deck Slabs in Steel-Concrete Bridges[J]. ACI Structural Journal,2010,107(1): 82-91.