1 Introduction
2 Experimental program
2.1 Test parameters and details of specimens
Specimen | Size (Length × height × thickness) (mm) | Aspect ratio (hw/lw) | Failure mode (Flexural reinforcement) | Heated area |
---|---|---|---|---|
LFC | 960 × 2400 × 200 (LF) | 2.5 | Weak at Flexure (D10) | None |
LFH1 | Weak at Flexure (D10) | Half face | ||
LFH2 | Weak at Flexure (D10) | Single face | ||
LSC | 960 × 2400 × 200 (LS) | 2.5 | Weak at Shear (D29-D10) | None |
LSH1 | Weak at Shear (D29-D10) | Half face | ||
LSH2 | Weak at Shear (D29-D10) | Single face | ||
QFC | 1600 × 2400 × 200 (QF) | 1.5 | Weak at Flexure (D10) | None |
QFH2 | Weak at Flexure (D10) | Single face | ||
QSC | 1600 × 2400 × 200 (QS) | 1.5 | Weak at Shear (D25-D10) | None |
QSH2 | Weak at Shear (D25-D10) | Single face |
2.2 Materials
Design strength (MPa) | 28-day compressive strength (MPa) | W/C (%) | Weight per unit volume (kg/m3) | |||||||
---|---|---|---|---|---|---|---|---|---|---|
W | C | S | G | FA | Slag | pp fiber | ||||
60 | 60.8 | 27.9 | 160 | 401 | 715 | 883 | 57 | 115 | 0.8 |
Type | fy (MPa) | Es (GPa) |
---|---|---|
D10 | 600 | 194 |
D13 | 747 | 195 |
D25 | 542 | 211 |
D29 | 551 | 204 |
2.3 Fire test setup
2.4 Cyclic loading test setup
3 Fire Test Results
3.1 Observation After Fire Test
3.2 Temperature Distribution
4 Cyclic Loading Test Results
4.1 Crack Patterns And Failure Mode
4.2 Hysteretic Curves
4.3 Maximum Lateral Load
Specimen | Fmax+ (kN) | Fmax- (kN) | Fmax, avg (kN) | Drift at Fmax (%) |
---|---|---|---|---|
LFC | 267.9 | −263.1 | 265.5 | + 1.25/− 1.25 |
LFH1 | 254.6 | −247.6 | 251.2 | + 1.25/− 2.00 |
LFH2 | 240.6 | −241.38 | 241.0 | + 1.60/− 2.00 |
LSC | 576.6 | −579.4 | 578.0 | + 2.00/− 2.00 |
LSH1 | 552.2 | −540.5 | 546.3 | + 2.00/− 2.50 |
LSH2 | 522.4 | −577.9 | 550.2 | + 2.50/− 2.50 |
QFC | 632.61 | −591.3 | 611.9 | + 0.75/1.00 |
QFH2 | 560.6 | −571.7 | 566.2 | + 1.25/− 1.25 |
QSC | 946.9 | −964.6 | 955.8 | + 1.00/− 1.00 |
QSH2 | 945.9 | −929.3 | 937.6 | + 1.60/− 1.60 |
Specimen | Fmax, exp (kN) | Reduction rate of Fmax, exp | Ftheory (kN) | Reduction rate of Ftheory |
---|---|---|---|---|
LFC | 265.475 | 1.000 | 232.64 | 1.000 |
LFH2 | 240.98 | 0.908 | 208.72 | 0.897 |
LSC | 578.025 | 1.000 | 499.42 | 1.000 |
LSH2 | 550.15 | 0.952 | 472.15 | 0.956 |
4.4 Stiffness
4.5 The Envelopes Curves
Specimen | Fy (kN) | δy (mm) | δu (mm) | Ductility index,\(\mu \) |
---|---|---|---|---|
LFC | 231 | 14.7 | 53.0 | 3.6 |
LFH1 | 204 | 21.2 | 53.0 | 2.5 |
LFH2 | 197 | 22.3 | 53.0 | 2.4 |
LSC | 495 | 28.8 | 53.0 | 1.8 |
LSH1 | 477 | 35.6 | 53.0 | 1.5 |
LSH2 | 485 | 43.3 | 66.3 | 1.5 |
QFC | 525 | 9.2 | 33.1 | 3.6 |
QFH2 | 478 | 17.8 | 33.1 | 1.9 |
QSC | 797 | 15.8 | 33.1 | 2.1 |
QSH2 | 790 | 26.0 | 42.4 | 1.6 |