Improved Analytical Method for Interfacial-Slip Control Design of Steel–Concrete Composite Structures
Abstract
:1. Introduction
2. Interfacial Interaction of the Composite Structures
2.1. Model Description and Assumption
- (1)
- The interfacial shear stress is proportional to the slip, which gives
- (2)
- The steel beam and the concrete slab have the equivalent curvature, and both follow the plane cross-section hypothesis. Thus, the relationship between the curvature and the strain can be established. An infinitesimal element of the composite beam, , is selected to be approximately equivalent to an arc segment. When the micro-arc section has an angle, , (i.e., the tangent angle corresponding to the micro-arc section), as shown in Figure 3, the tensile strain at the bottom of the concrete slab can be obtained from the geometric relationship:
2.2. Theoretical Modeling
2.3. Discussions on the Analytical Solution
3. Analytical Model Validation Based on Testing Results
4. Improved Interfacial Design Based on Parametric Analysis
5. Slip-Induced Deformation Properties of Composite Structures
5.1. Deflection of the Composite Beam without the Slip Effect
5.2. Slip-Induced Additional Deflection of the Composite Beam
6. Conclusions
- (1)
- The analytical solution of the interfacial slip of the composite beam can be illustrated with Equations (23) and (33), and the interfacial strain can be described by Equations (34a) and (34b). The case of composite beams under uniform loads or other kinds of loads can be solved in a similar way. The study, for the first time, provides the closed-form solution for straightforwardly describing the interfacial interaction.
- (2)
- The comparison analysis with the results of experimental tests, numerical study and energy method performed by Fabbrocino et al. in Ref. [15] and Jiang et al. in Ref. [20], validates the predictions obtained by the proposed analytical model. This means the proposed model can be used for describing the interfacial interaction and structural performance of the composite beam.
- (3)
- Priority should be given to the design of interfacial shear stiffness and the longitudinal spacing of shear studs to achieve the optimal interfacial strength of the composite beam. The ultimate load and the width of concrete slab can be considered in turn to obtain the best interfacial connection performance and avoid the occurrence and propagation of interfacial slip.
- (4)
- The interfacial slip effect should be carefully considered for composite beams with relatively short spans (i.e., beams with about 8 m span). In general, the slip-induced deflection should be considered to judge the deformation and bearing capacity of the composite beam, since the slip-induced additional deflection can have a weight in the global deflection that cannot be ignored.
- (5)
- The analytical model describing the interfacial shear stress between the concrete slab and the top flange of the steel beam can be used to develop a constitutive model for the case of a composite beam subjected to bending. The latter model can be used to determine the effect of the interfacial slip on the load-carrying capacity and stiffness of the beam considered.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Content | Label | Value | Unit |
---|---|---|---|
Elastic modulus of concrete slab | Ec | 30,000 | N/mm2 |
Elastic modulus of steel beam | Es | 206,000 | N/mm2 |
Height of concrete slab | hc | 90 | mm |
Height of steel beam | hs | 125 | mm |
Height of the composite beam | h | 215 | mm |
Width of concrete slab | bc | 1200 | mm |
Width of steel beam | bs | 125 | mm |
Cross-section area of concrete slab | Ac | 108,000 | mm2 |
Cross-section area of steel beam | As | 2892 | mm2 |
Inertial moment of concrete slab | Ic | 72,900,000 | mm4 |
Inertial moment of steel beam | Is | 8,196,709 | mm2 |
Longitudinal spacing of shear studs | p | 100 | mm |
Shear stiffness of shear studs | K | 33,000 | N/mm |
Span of the composite beam | l | 8 | m |
Central point load applied on the beam | p | 80 | kN |
Span l (m) | 8 | 6 | 4 | |
---|---|---|---|---|
Deflection (mm) | ||||
Slip-induced additional deflection at midspan Δf | 8.71 | 5.61 | 2.70 | |
Deflection at midspan of the composite beam without slip effect f | 88.06 | 37.15 | 11.01 | |
Deflection at midspan of the composite beam with slip effect f + Δf | 96.77 | 42.76 | 13.71 | |
Δf/f (%) | 10 | 15 | 24 |
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Wang, H.-P.; Song, T.; Yan, J.-W.; Xiang, P.; Feng, S.-Y.; Hui, D. Improved Analytical Method for Interfacial-Slip Control Design of Steel–Concrete Composite Structures. Symmetry 2021, 13, 1225. https://doi.org/10.3390/sym13071225
Wang H-P, Song T, Yan J-W, Xiang P, Feng S-Y, Hui D. Improved Analytical Method for Interfacial-Slip Control Design of Steel–Concrete Composite Structures. Symmetry. 2021; 13(7):1225. https://doi.org/10.3390/sym13071225
Chicago/Turabian StyleWang, Hua-Ping, Tao Song, Jian-Wei Yan, Ping Xiang, Si-Yuan Feng, and David Hui. 2021. "Improved Analytical Method for Interfacial-Slip Control Design of Steel–Concrete Composite Structures" Symmetry 13, no. 7: 1225. https://doi.org/10.3390/sym13071225
APA StyleWang, H.-P., Song, T., Yan, J.-W., Xiang, P., Feng, S.-Y., & Hui, D. (2021). Improved Analytical Method for Interfacial-Slip Control Design of Steel–Concrete Composite Structures. Symmetry, 13(7), 1225. https://doi.org/10.3390/sym13071225