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- 저자 : Zhou-Dao Lu (검색결과 3 건)
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Kequan YU,Zhou-Dao Lu 사단법인 한국계산역학회 2015 Computers and Concrete, An International Journal Vol.15 No.2
The residual fracture toughness of post-fire normal-strength concrete subjected up to 600ºC is considered by the wedge splitting test. The initial fracture toughness KIini and the critical fracture toughness KIun could be calculated experimentally. Their difference is donated as the cohesive fracture toughness KIc which is caused by the distribution of cohesive stress on the fracture process zone. A comparative study on determining the residual fracture toughness associated with three bi-linear functions of the cohesive stress distribution, i.e. Peterson’s softening curve, CEB-FIP Model 1990 softening curve and Xu’s softening curve, using an analytical method is presented. It shows that different softening curves have no significant influence on the fracture toughness. Meanwhile, comparisons between the experimental and the analytical calculated critical fracture toughness values further prove the validation of the double-K fracture model to the post-fire concrete specimens.
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Flexural performance of fire damaged and rehabilitated two span reinforced concrete slabs and beams
Yu, Jiang-Tao,Liu, Yuan,Lu, Zhou-Dao,Xiang, Kai Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.6
Five two-span reinforced concrete (RC) slabs and seven two-span RC beams were tested under the ISO 834 standard fire with different durations. CFRP strengthening was then applied to some of the specimens after the damaged concrete was removed from the specimens and replaced with polymer mortar. All the specimens were loaded to failure to investigate the influence of fire-damage and the effectiveness of strengthening methods. Test results indicated that the flexural capacities of specimens decrease with the fire duration increases. Moreover, fire exposure had more significant effect on the flexural rigidity than on the bearing capacity of the specimens. After rehabilitation, the bearing capacities of specimens reached or even exceeded that of the reference RC specimen, and the strengthening methods seemed to have limited effect on flexural rigidity recovery. From the analysis of moment redistribution of tested beams, elevated temperature is found having different impacts on sagging moment region and hogging moment region. The damage of RC continuous member is definitely a comprehensive response of different regions.
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Flexural performance of fire damaged and rehabilitated two span reinforced concrete slabs and beams
Jiang-Tao Yu,Yuan Liu,Zhou-Dao Lu,Kai Xiang 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.42 No.6
Five two-span reinforced concrete (RC) slabs and seven two-span RC beams were tested under the ISO 834 standard fire with different durations. CFRP strengthening was then applied to some of the specimens after the damaged concrete was removed from the specimens and replaced with polymer mortar. All the specimens were loaded to failure to investigate the influence of fire-damage and the effectiveness of strengthening methods. Test results indicated that the flexural capacities of specimens decrease with the fire duration increases. Moreover, fire exposure had more significant effect on the flexural rigidity than on the bearing capacity of the specimens. After rehabilitation, the bearing capacities of specimens reached or even exceeded that of the reference RC specimen, and the strengthening methods seemed to have limited effect on flexural rigidity recovery. From the analysis of moment redistribution of tested beams, elevated temperature is found having different impacts on sagging moment region and hogging moment region. The damage of RC continuous member is definitely a comprehensive response of different regions.
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