Experimental and Numerical Study of Flexural Stiffness Performance of Ultra-Thin, Prefabricated, and Laminated Slab Base Slabs
Abstract
:1. Introduction
2. Experiment Overview
2.1. Specimen Design
2.2. Material Properties
2.3. Loading Scheme and Measurement Content
3. Experimental Results and Analysis
3.1. Experimental Phenomenon
3.2. Load-Deflection Curve and Stiffness Analysis
4. Finite Element Simulation Analysis
4.1. Model Building
4.2. Comparison of Load-Deflection Curves
4.3. Analysis of Different Parameters
4.3.1. Truss Height
4.3.2. Base Slab Thickness
4.3.3. Truss Spacing
5. Conclusions
- (1)
- The ultra-thin precast base slab can compensate for the loss of stiffness by reducing the truss spacing, and its short-term stiffness and cracking load are significantly higher than the conventional 60 mm thick laminated base slab.
- (2)
- Increasing the truss height and decreasing the truss spacing improve the force performance of the precast base slab in terms of short-term stiffness, cracking load, and ductility. The improvement effect decreases with increasing the truss height and decreasing the truss spacing, in which decreasing the truss spacing has the most excellent effect on the force performance of the base slab.
- (3)
- Considering the production cost and construction requirements of ultra-thin prefabricated base slab, it is recommended that the truss spacing should be 300~200 mm, and the truss height should be determined according to the total thickness of the floor slab.
- (4)
- The ultra-thin prefabricated laminated base slab with reduced spacing between the steel trusses meets the requirements of the project and provides more space for the placement of pipelines.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Specimen Number | Truss Spacing/mm | Truss Height/mm | Base Slab Thickness/mm |
---|---|---|---|
YZB1 | 300 | 65 | 30 |
YZB2 | 300 | 75 | 30 |
YZB3 | 300 | 110 | 30 |
YZB4 | 600 | 75 | 30 |
YZB5 | 600 | 75 | 60 |
Concrete | Measured Compressive Strength/Mpa | Average Value/Mpa | ||
---|---|---|---|---|
Test1 | Test2 | Test3 | ||
Specimen | 36.2 | 37.3 | 36.9 | 36.8 |
Rebar | Diameter/mm | Yield Strength/Mpa | Ultimate Tensile Strength/Mpa |
---|---|---|---|
Upper chord rebar | 12 | 460.33 | 605.04 |
Lower chord rebar | 8 | 431.12 | 561.36 |
Web bar rebar | 6 | 320.58 | 428.25 |
Distributed rebar | 6 | 422.20 | 543.79 |
Specimen Number | Short-Term Stiffness/(kN·m2) | Cracking Load/(kN/m2) | Cracking Deflection/mm |
---|---|---|---|
YZB1 | 149.56 | 1.60 | 5.16 |
YZB2 | 229.06 | 1.95 | 4.12 |
YZB3 | 558.59 | 3.37 | 3.21 |
YZB4 | 89.99 | 0.98 | 4.48 |
YZB5 | 121.49 | 1.06 | 2.46 |
Model | Truss Spacing/mm | Truss Height/mm | Base SLAB Thickness/mm |
---|---|---|---|
MX1 | 300 | 65 | 30 |
MX2 | 300 | 75 | 30 |
MX3 | 300 | 85 | 30 |
MX4 | 300 | 95 | 30 |
MX5 | 300 | 105 | 30 |
MX6 | 300 | 115 | 30 |
MX7 | 600 | 75 | 30 |
MX8 | 150 | 75 | 30 |
MX9 | 600 | 75 | 40 |
MX10 | 600 | 75 | 50 |
MX11 | 600 | 75 | 60 |
MX12 | 600 | 75 | 70 |
Truss Height/mm | Short-Term Stiffness/(kN·m2) | Increase | Cracking Load/(kN/m2) | Increase |
---|---|---|---|---|
65 | 164.96 | - | 1.90 | - |
75 | 226.39 | 37.24% | 2.30 | 21.05% |
85 | 299.98 | 32.51% | 2.70 | 17.39% |
95 | 365.49 | 21.84% | 3.06 | 13.33% |
105 | 431.49 | 18.06% | 3.40 | 11.11% |
115 | 502.00 | 16.34% | 3.74 | 10.00% |
Base Slab Thickness/mm | Short-Term Stiffness/(kN·m2) | Increase | Cracking Load/(kN/m2) | Increase |
---|---|---|---|---|
30 | 80.76 | - | 1.20 | - |
40 | 114.64 | 41.95% | 1.36 | 13.33% |
50 | 141.32 | 23.28% | 1.56 | 14.71% |
60 | 169.56 | 19.99% | 1.82 | 33.82% |
70 | 204.02 | 20.32% | 2.40 | 31.87% |
Truss Spacing/mm | Short-Term Stiffness/(kN·m2) | Increase | Cracking Load/(kN/m2) | Increase |
---|---|---|---|---|
600 | 80.76 | - | 1.20 | - |
300 | 226.39 | 180.32% | 2.30 | 91.67% |
200 | 306.20 | 35.25% | 2.70 | 17.39% |
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Chen, Y.; Chen, Y.; Lu, D.; Zhang, M.; Lu, P.; Chen, J. Experimental and Numerical Study of Flexural Stiffness Performance of Ultra-Thin, Prefabricated, and Laminated Slab Base Slabs. Sustainability 2022, 14, 13472. https://doi.org/10.3390/su142013472
Chen Y, Chen Y, Lu D, Zhang M, Lu P, Chen J. Experimental and Numerical Study of Flexural Stiffness Performance of Ultra-Thin, Prefabricated, and Laminated Slab Base Slabs. Sustainability. 2022; 14(20):13472. https://doi.org/10.3390/su142013472
Chicago/Turabian StyleChen, Yihu, Yiyan Chen, Dan Lu, Min Zhang, Pengyuan Lu, and Jingyi Chen. 2022. "Experimental and Numerical Study of Flexural Stiffness Performance of Ultra-Thin, Prefabricated, and Laminated Slab Base Slabs" Sustainability 14, no. 20: 13472. https://doi.org/10.3390/su142013472