1 Introduction
2 Description of GFRP and Deformed Steel Hybrid Bar
3 Experimental Program
3.1 Test Specimens
Specimen no. | Specimen ID | Nominal diameter (core diameter) (mm) | Pitch space of fiber ribs (mm) | Number of samples |
---|---|---|---|---|
1 | D13 | 12.7 | 12.8 | 6 |
2 | D13 (D10) | 12.7 (9.53) | 12.8 | 6 |
3 | D16 (D10) | 15.9 (9.53) | 15.9 | 6 |
4 | D16 (D13) | 15.9 (12.7) | 15.9 | 6 |
5 | D19 | 19.1 | 19.1 | 6 |
6 | D19 (D10) | 19.1 (9.53) | 19.1 | 6 |
7 | D19 (D13) | 19.1 (12.7) | 19.1 | 6 |
8 | D19 (D16) | 19.1 (16.1) | 19.1 | 6 |
3.2 Test Setup and Strain Measurement
4 Results and Discussions
4.1 Load-Slip Relationship
4.2 Tensile Stress–Strain Relationship
D13 | D13 (D10) | D16 (D10) | D16 (D13) | D19 | D19 (D10) | D19 (D13) | D19 (D16) | |
---|---|---|---|---|---|---|---|---|
1 | 1108.5 | 649.7 | 768.3 | 591.5 | 957.0 | 893.1 | 561.2 | 483.0 |
2 | 1125.1 | 704.0 | 818.8 | 611.0 | 872.6 | 910.2 | 576.0 | 498.4 |
3 | 1112.8 | 680.0 | 794.3 | 613.1 | 924.7 | 845.2 | 534.7 | 438.4 |
4 | 1174.9 | – | 805.6 | 611.6 | 858.2 | 854.6 | 535.3 | 490.9 |
5 | 1091.6 | – | 799.9 | 606.2 | 942.2 | 922.1 | 413.5 | 473.6 |
6 | 1108.5 | – | 805.8 | 634.1 | 865.7 | 970.0 | 536.7 | 472.7 |
Average tensile strength (MPa) | 1120.2 | 677.9 | 798.8 | 611.3 | 903.4 | 899.2 | 526.2 | 476.2 |
Standard deviation (MPa) | 24.4 | 22.2 | 15.5 | 12.5 | 39.3 | 42.0 | 52.7 | 19.2 |
4.3 Investigation of Tensile Strength, Modulus of Elasticity and Cross Sectional Ratio
D13(D10) | D16(D10) | D16(D13) | D19(D10) | D19(D13) | D19(D16) | |
---|---|---|---|---|---|---|
Average modulus of elasticity | ||||||
Average E (GPa) | 123.0 | 104.4 | 145.5 | 87.8 | 126.2 | 139.1 |
Standard deviation (GPa) | 12.7 | 3.8 | 12.7 | 4.4 | 10.2 | 26.5 |
Tangent modulus of elasticity | ||||||
1 | 25.0 | 52.3 | 18.5 | 40.1 | 22.5 | 10.9 |
2 | 22.2 | 34.0 | 57.1 | 42.8 | 16.9 | 10.6 |
3 | 23.0 | 65.0 | 14.1 | 41.9 | 37.1 | 5.2 |
4 | 15.7 | 57.1 | 19.9 | 40.7 | 46.8 | 8.5 |
5 | 26.3 | 34.6 | 17.6 | 44.8 | 25.3 | 5.0 |
6 | 22.0 | 31.1 | 17.8 | 42.2 | 49.7 | – |
Average E
T (GPa) | 23.3 | 45.7 | 30.2 | 42.1 | 33.0 | 8.1 |
Standard deviation (GPa) | 3.4 | 13.0 | 14.1 | 1.5 | 12.4 | 2.8 |