Abstract
A partial connection–prestressing (PCP) method is proposed in this paper to decrease the prestress that was transferred to steel girders in the negative moment region of steel–concrete composite bridges. The partial connection is achieved by the application of rubber-sleeved studs (RSS) in the prestressed concrete slab in the negative moment region. Since there is no experimental research on the PCP method in continuous composite girders, to the best of the authors’ knowledge, two continuous composite girders were tested under a four-point static load to evaluate their mechanical performance. The test results showed that without decreasing the ultimate strength and overall stiffness of the steel–concrete composite girders, the PCP method enhanced the cracking load (Pcr) 3.1 times. In addition, 12.5% of the prestressing force was transferred into the steel girder at the internal support section with the PCP method, and the girder without the PCP reached 25.9%. Then, to elucidate the partial interaction effect and prestressing effect on continuous girders’ mechanical behavior, numerical models were developed and calibrated with the test results. From the numerical analysis, compared with normal composite girders, the application of RSS or prestressing could improve Pcr by 11.8% and 157.0%, respectively, and the value increases to 234.3% when RSS and prestressing are applied at the same time. The results indicate that the application of RSS in the negative moment region could effectively increase the prestressing efficiency in the concrete slab and enhance the bridge's durability.
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Acknowledgments
This research is sponsored by the National Natural Science Foundation of China (No. 51978501) and the Major Research and Development Project of Jiangxi Province (No. 20165ABC2800).
Notation
The following symbols are used in this paper:
- Ac, As
- area of concrete slab and steel girder;
- Ap
- area of prestressed tendons;
- Ec and Es
- elasticity modulus of concrete slab and steel girder;
- ft,r and fc,r
- ultimate tensile and compressive strength of the concrete;
- fy and fu
- yielding stress and ultimate stress of steel plates’ coupon test;
- hs
- height of steel girder;
- Is and I0
- inertia moments of steel girder and steel–concrete composite section;
- kt and η
- tensile stiffness of studs and effective coefficient of prestress application;
- Mcr,exp and Mcr,the
- experimental and theoretical cracking moment of concrete slab;
- Ml,test, Ms,test, and Mmid,test
- measured bending moments of the midspan at longer span, shorter span, and internal support section;
- Ml,e, Ms,e, and Mmid,e
- elastic calculated bending moments of the midspan at longer span, midspan at shorter span, and internal support section;
- Mu
- ultimate moment at the internal support section;
- Nc and Ns
- axial force in concrete and steel girder after prestressed;
- Pcr and Pu
- cracking load and ultimate load of specimens;
- Py and My
- yielding load and yielding moment of bottom steel plate at internal support section;
- Q
- shear force at the steel–concrete interface;
- Rm, Rl, and Ra
- reactive force of internal support, end support of longer span, end support of shorter span;
- ycomp
- distance between composite neutral axis and steel top flange (varied with external load);
- y0
- distance between composite neutral axis and steel bottom flange;
- α
- bending moment modulation factor;
- αt and αc
- regulation coefficient of the descending part in concrete constitution curve;
- δu-l and δu-s
- deflection of midspan at the longer span and shorter span recorded at ultimate load;
- ɛt,r and ɛc,r
- strain that corresponds to the ultimate tensile and compressive strengths of the concrete;
- σp
- concrete stress caused by prestress; and
- σtop and σbot
- measured stress of steel top and bottom flange at the section of internal support.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 28 • Issue 3 • March 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jul 16, 2022
Accepted: Oct 29, 2022
Published online: Dec 26, 2022
Published in print: Mar 1, 2023
Discussion open until: May 26, 2023
ASCE Technical Topics:
- Analysis (by type)
- Bridge engineering
- Bridges
- Bridges (by material)
- Chemicals
- Chemistry
- Composite bridges
- Composite materials
- Engineering fundamentals
- Engineering materials (by type)
- Environmental engineering
- Girders
- Materials engineering
- Materials processing
- Numerical analysis
- Organic compounds
- PCP
- Plate girders
- Prestressing
- Steel bridges
- Structural engineering
- Structural members
- Structural systems
- Wood bridges
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