Qingfeng Xu_Experimental study on fire resistance and post fire performance of engineered bamboo components
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1) Fire resistance tests were conducted on engineered bamboo beam and column components to evaluate their fire performance. 2) The fire resistance of laminated bamboo beams decreased as the load ratio increased but increased with larger cross sections, with failures from flexural cracking. 3) Post-fire tests found that initial stiffness and strength of exposed bamboo members decreased as exposure time increased.
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Qingfeng Xu_Experimental study on fire resistance and post fire performance of engineered bamboo components
- 1. Shanghai Research Institute of Building Sciences Dr. Qingfeng Xu Shanghai Research Institute of Building Sciences 2018-6-26 Experimental study on fire performance of engineered bamboo components 上海市建筑科学研究院 Shanghai Research Institute of Building Sciences
- 2. Shanghai Research Institute of Building Sciences Outlines p Introduction p Experimental Program p Results and Discussion p Conclusions
- 3. Shanghai Research Institute of Building Sciences Introduction Glue Compress Mechanical performance Geometry Connections Repeatability unstable Industrial Standard Modern stable limited unlimited complicated simple low high Round bamboo Laminated bamboo Bamboo scrimber Engineered bamboo p Bamboo is combustible, fire performance is one of the main concerns in bamboo building constructions p Few studies are available on fire performance of engineered bamboo members p Fire resistance tests and post fire performance tests were conducted
- 4. Shanghai Research Institute of Building Sciences Experimental Program p Fire resistance tests on engineered bamboo members Specimen design Measurements Member type Specimen No. Geometry（mm） Exposed Load ratio Beam LGB-1 100×225×2630 - - LGB-2 100×225×2630 Three-side fire 0.20 LGB-3 100×225×2630 Three-side fire 0.35 LGB-4 100×225×2630 Three-side fire 0.50 LGB-5 220×450×2630 Three-side fire 0.20 Test process
- 5. Shanghai Research Institute of Building Sciences Experimental Program p Fire resistance tests on engineered bamboo members Specimen design Measurements Test process • Temperature measurement DL-1 DL-2 DL-3 L/2 L/2 L • Displacement measurement 870 1660 1 1 2 2 100 100 225 225 1-1 T1 T2 T3 T4 50 25 100 25 50 25 100 220 450 450 T1 T2 T3 T4 110 25 220 50 100 25 225 T5 50 225 T5 25 100 2-2 1-1 2-2 100 225 225 1-1 T1 T2 T3 T4 50 25 100 25 50 25 100 220 450 450 T1 T2 T3 T4 110 25 220 50 10025 225 T5 50 225 T5 25 100 2-2 1-1 2-2 100 225 225 1-1 T1 T2 T3 T4 50 25 100 25 50 25 100 220 450 450 T1 T2 T3 T4 110 25 220 50 100 25 225 T5 50 225 T5 25 100 2-2 1-1 2-2 100 225 225 1-1 T1 T2 T3 T4 50 25 100 25 50 25 100 220 450 450 T1 T2 T3 T4 110 25 220 50 100 25 225 T5 50 225 T5 25 100 2-2 1-1 2-2
- 6. Shanghai Research Institute of Building Sciences Experimental Program p Fire resistance tests on engineered bamboo members Specimen design Measurements Test process Install specimen and seal furnace Apply load and keep constant for 10min Start the fire follow ISO 834 standard fire curve, keep load constant Stop the fire if load cannot keep constant or beam failure or flame burst out furnace wall reaction frame load jack distribute beam specimen L/3 L/3 L/3 L
- 7. Shanghai Research Institute of Building Sciences Experimental Program p Post fire performance tests on engineered bamboo members Specimen design Member type Specimen No. Geometry（mm） Material Fire time t （min） Fire exposure surfaces Column LGCS-1-t 100×100×450 Laminated bamboo 0, 10, 20 4 LGCS-2-t 200×225×450 0, 20 4 SGCS-1-t 100×100×450 Bamboo scrimber 0, 10, 20 4 SGCS-2-t 140×140×450 0, 20 4 Beam LGBA-1,2 100×225×2630 Laminated bamboo 0, 10, 25 3 SGB, SGBA-1,2 100×140×2430 Bamboo scrimber 0, 10, 25 3 SGBA-3 70×140×2430 10 3 Test processMeasurements
- 8. Shanghai Research Institute of Building Sciences Experimental Program p Post fire performance tests on engineered bamboo members Specimen design Test processMeasurements • Strain measurement DL-1 DL-2 DL-3 L/2 L/2 L • Displacement measurement Beams Columns b h h/2 b/2 1 2 3 4 b/2b/2 b/2b/2 d 6×d/6=d 1 2 3 4 5 6 7
- 9. Shanghai Research Institute of Building Sciences Start the fire follow ISO 834 standard fire curve Experimental Program p Post fire performance tests on engineered bamboo members Specimen design Measurements Test process Install specimen and seal furnace Static loading tests Stop the fire at predefined time, put out and cooling down with water reaction frame load jack distribute beam specimen L/3 L/3 L/3 L Column Load Base Beam Column
- 10. Shanghai Research Institute of Building Sciences Results and Discussion p Fire resistance tests on engineered bamboo members Specimen No. Load ratio Fire resistance/min LGB-2 0.20 30 LGB-3 0.35 22 LGB-4 0.50 10 LGB-5 0.20 50 LGB-3 LGB-4
- 11. Shanghai Research Institute of Building Sciences Results and Discussion p Post fire performance tests on engineered bamboo beams
- 12. Shanghai Research Institute of Building Sciences Results and Discussion p Post fire performance tests on engineered bamboo columns
- 13. Shanghai Research Institute of Building Sciences Results and Discussion p Post fire performance tests on engineered bamboo beams Laminated bamboo Bamboo scrimber
- 14. Shanghai Research Institute of Building Sciences Results and Discussion p Post fire performance tests on engineered bamboo columns Laminated bamboo Bamboo scrimber
- 15. Shanghai Research Institute of Building Sciences Results and Discussion p Post fire performance tests on engineered bamboo members Specimen Exposed time (min) Ultimate load (kN) Laminated bamboo LGB 0 190.0 LGBA-1 10 100.3 LGBA-2 25 43.3 Bamboo Scrimber SGB 0 68.1 SGBA-1 10 45.5 SGBA-2 25 16.4 SGBA-3 10 22.5 Specimen Exposed time (min) Ultimate load (kN) Laminated Bamboo LGCS-1 0 624.0 LGCS-1-10 10 392.5 LGCS-1-20 20 105.6 LGCS-2 0 2042.5 LGCS-2-20 20 1192.0 Bamboo Scrimber SGCS-1 0 798.7 SGCS-1-10 10 567.2 SGCS-1-20 20 307.3 SGCS-2 0 1401.9 SGCS-2-20 20 649.8 Beams Columns
- 16. Shanghai Research Institute of Building Sciences Conclusions l Fire resistance of laminated bamboo beams decreased with increased load ratio, increased with increased cross section. l All beams exhibited flexural failure triggered by tensile fracture of the extreme tension fibres, and laminated bamboo and bamboo scrimber columns failed by cracking between the layers and fibres. l Initial stiffness and ultimate loads of the exposed engineered bamboo members decreased with increased exposed time, The strain distribution at the mid-span cross-section was essentially linear for all beams.
- 17. Shanghai Research Institute of Building Sciences