1 Introduction
2 RSS Joint Bending Resistance Evaluation
2.1 Test Introduction
No. | Details | Joint reinforcement connection form | ρc (%) | ρi |
---|---|---|---|---|
V-1 | Complete beam without joint | – | 1.64 | 1.64% L |
V-2 | Joint beam without waist reinforcement | Lap | 3.28 | 1.64% L + 1.26% V |
V-3 | Joint beam with waist reinforcement | Lap | 3.91 | 2.27% L + 2.09% V |
V-4 | Joint beam with waist reinforcement | Weld | 4.41 | 2.52% L + 0.84% V |
UHPC type | fcu/MPa | fr/MPa | ft/MPa | Ec/GPa |
---|---|---|---|---|
UHPC150 | 160.7 | 26.5 | 8.12 | 50.3 |
UHPC 150’ | 142.4 | 16.6 | 3.53 | 46 |
2.2 Test Results and Discussion
2.2.1 Failure Mode
2.2.2 Load–Displacement Curve and Crack Development
No. | Failure/kN | Interface cracking/kN | Matrix cracking/kN | FV-i/FV-1 | F0.05mm/kN | F0.1mm/kN | F0.2mm/kN |
---|---|---|---|---|---|---|---|
V-1 | 286.1 | – | 87.6 | 1 | 147.94 | 184.46 | 253.90 |
V-2 | 197.4 | 53.4 | 48.4 | 0.69 | 92.62 | 133.23 | 173.38 |
V-3 | 225.4 | 73.5 | 43.4 | 0.79 | 93.55 | 103.83 | 182.47 |
V-4 | 256.2 | 47.9 | 68.7 | 0.90 | 109.13 | 167.81 | – |
2.2.3 Durability-Based Cracking Stress
No. | σ0.05/MPa | σO-i/σO-1 | Crack location |
---|---|---|---|
V-1 | 20.71 | 1 | Matrix |
V-2 | 12.97 | 0.63 | Interface |
V-3 | 13.10 | 0.63 | Joint matrix |
V-4 | 15.28 | 0.74 | Joint matrix |
2.3 The Preliminary Summary of the Test
2.4 Ultimate Flexural Capacity of RSS Jointed Beam
3 RSS Joint Shear Performance Evaluation
3.1 Test Introduction
No. | Joint location | Span/m | Shear-to-span ratio | Effective height/m |
---|---|---|---|---|
B-1 | Complete beam | 3.5 | 3.14 | 470 |
B-2 | Flexural–shear section | 3.5 | 3.14 | 470 |
B-3 | Flexural–shear section | 1.85 | 1.41 | 470 |
B-4 | Flexural–shear section | 2.5 | 2.09 | 470 |
B-5 | Flexural–shear section | 3.5 | 3.14 | 470 |
3.2 Test Results and Discussion
3.2.1 Load–Displacement Curve and Crack Propagation
3.2.2 Discussion
3.3 Theoretical Formula of the Shear-Resistance Capacity
3.3.1 CECS38: 2004 (CECS, 2004; Chengkui & Guofan, 2004)
3.3.2 SETRA-AFGC2016 (AFNOR, 2016)
3.3.3 Upper Bound Theory of Plasticity (Nielsen, 1963, 1967)
3.3.4 Modified Compression Field Theory (Vecchio & Collins, 1986)
3.3.5 Truss–Arch Model (Kim et al., 1998; Leondardt, 1965)
3.3.6 Calculating Results
No. | B-3 | B-4 | B-5 | Average | Standard deviation | Variation coefficient |
---|---|---|---|---|---|---|
Ex | 667 | 723 | 806 | 732 | – | – |
Pr.1 | 1018.8 | 849 | 636.8 | 834.9 | 0.25 | 27.56% |
Ex./Pr.1 | 0.65 | 0.85 | 1.27 | 0.92 | ||
Pr.2 | 883.8 | 736.5 | 552.4 | 724.2 | 0.29 | 27.56% |
Ex./Pr.2 | 0.75 | 0.98 | 1.46 | 1.07 | ||
Pr.3 | 997.6 | 733.1 | 512.7 | 747.8 | 0.37 | 34.79% |
Ex./Pr.3 | 0.67 | 0.99 | 1.57 | 1.08 | ||
Pr.4 | 883.5 | 842.8 | 704.8 | 810.4 | 0.16 | 17.89% |
Ex./Pr.4 | 0.75 | 0.86 | 1.14 | 0.92 | ||
Pr.5 | 907.8 | 687.2 | 499 | 698 | 0.36 | 32.11% |
Ex./Pr. 5 | 0.73 | 1.05 | 1.62 | 1.13 |