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Evaluation and Strengthening of the Flexural Behavior of 45-Year-Old Precast PC Hollow-Core Slabs
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Guolin WANG1, Nan YE1, Yulin MIAO1, Yuhua Tang2, Rong ZHANG3
Industrial Construction | 2026, 56(5) : 141 - 147
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Industrial Construction | 2026, 56(5): 141-147
Evaluation and Strengthening of the Flexural Behavior of 45-Year-Old Precast PC Hollow-Core Slabs
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Guolin WANG1, Nan YE1, Yulin MIAO1, Yuhua Tang2, Rong ZHANG3
Affiliations
  • 1Faculty of Urban Construction and Ecological Technology，Shanghai Institute of Technology， Shanghai201418， China
  • 2Shanghai Construction and Management Commission， Shanghai201499， China
  • 3Shanghai Tangyi Construction Engineering Management Co.， Ltd.， Shanghai201400， China
Published: 2026-05-20 doi: 10.3724/j.gyjzG26031503
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Many existing rural houses face structural safety hazards due to material performance degradation. This study investigated the residual bearing capacity and the strengthening effect of carbon fiber reinforced polymer （CFRP） sheets on old precast prestressed concrete （PC） hollow-core slabs， using specimens obtained from a demolished 45-year-old rural house in Shanghai. The test involved two PC slabs： one served as the control specimen， and the other was strengthened with CFRP sheets. Static loading tests were conducted to compare and analyze their failure modes， deformation capacity， and energy dissipation capacity. Based on the measured data， the strain development pattern of the CFRP sheets was analyzed. The results showed that the 45-year-old PC hollow-core slabs still had a certain bearing capacity but with a low safety margin， exhibiting a typical brittle flexural failure due to under-reinforcement. After CFRP strengthening， the failure mode changed to shear failure with obvious ductile characteristics， because the CFRP sheets bore the main tensile stress in the later loading stage.

existing rural buildings  /  precast prestressed concrete hollow-core slabs  /  CFRP sheet strengthening  /  flexural behavior
Guolin WANG, Nan YE, Yulin MIAO, Yuhua Tang, Rong ZHANG. Evaluation and Strengthening of the Flexural Behavior of 45-Year-Old Precast PC Hollow-Core Slabs[J]. Industrial Construction, 2026 , 56 (5) : 141 -147 . DOI: 10.3724/j.gyjzG26031503
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Article Info
doi: 10.3724/j.gyjzG26031503
  • Receive Date：2026-03-15
  • Online Date：2026-06-25
  • Published：2026-05-20
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  • Received：2026-03-15
Affiliations
    1Faculty of Urban Construction and Ecological Technology，Shanghai Institute of Technology， Shanghai201418， China
    2Shanghai Construction and Management Commission， Shanghai201499， China
    3Shanghai Tangyi Construction Engineering Management Co.， Ltd.， Shanghai201400， China
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https://castjournals.cast.org.cn/joweb/gyjz/EN/10.3724/j.gyjzG26031503
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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