建筑结构学报2026，Vol.47Issue(6)：97-112,16.DOI:10.14006/j.jzjgxb.2025.0490
基于不同防火保护的磷酸镁无机胶粘贴CFRP布加固混凝土梁耐火性能试验研究
Experimental study on fire resistance of concrete beams strengthened with CFRP sheets bonded by magnesium phosphate inorganic adhesive based on different fire insulations
摘要
Abstract
To investigate the effect of fire insulations on the fire resistance of concrete beams strengthened with CFRP sheets pasted by magnesium phosphate inorganic adhesive(referred to as CFRP-MPIA strengthened beams),this study considered fire insulation material(cement mortar and MPIA),thickness(10,20 mm,and 30 mm),and configuration(insulation height of 140 mm and 300 mm on beam side)as experimental parameters.A total of 14 specimens were designed and fabricated,and fire tests were conducted under sustained loading.During the tests,the fire behaviors of CFRP-MPIA strengthened beams,including temperature and mid-span deflection progressions,failure time of the strengthening system,fire resistance,and failure modes,were monitored.Moreover,the effects of fire insulation(material,thickness,and configuration)on the fire performance of the beams were investigated,and the failure mechanisms of both the fire insulation and strengthening system under fire exposure were clarified.The results show that the excellent high-temperature resistance of MPIA enables the"adhesive-CFRP sheet-adhesive"sandwich structure to provide effective thermal insulation for the CFRP sheets,and the service life of the CFRP-MPIA strengthening system without additional fire protection is thereby extended by nearly twice that of the CFRP-epoxy strengthening system with a 20-mm-thick cement mortar layer under fire conditions.In addition,used as the fire protection material,MPIA exhibits stronger adhesion to both the strengthening system and the concrete beam than cement mortar,reducing the risk of falling off and thereby extending the collaborative action between the strengthening system and the beam.This can enhance the fire resistance of the CFRP-MPIA strengthened beams with MPIA insulation by more than 90%compared with that without any fire insulation,which verifies the feasibility of employing MPIA as both a bonding agent and a fire protection material for CFRP strengthening.关键词
混凝土梁/CFRP加固/磷酸镁无机胶/防火保护/火灾试验/耐火性能Key words
concrete beam/CFRP-strengthening/magnesium phosphate inorganic adhesive(MPIA)/fire insulation/fire test/fire resistance分类
建筑与水利引用本文复制引用
任鹏飞,张瑞新,闫凯,李培佳,顾廷凯,陈潇阳,张鑫..基于不同防火保护的磷酸镁无机胶粘贴CFRP布加固混凝土梁耐火性能试验研究[J].建筑结构学报,2026,47(6):97-112,16.基金项目
国家自然科学基金项目(52308510,52378520),山东省自然科学基金项目(ZR2024QE157),山东省高等学校青年创新团队计划(2025KJH147). （52308510,52378520）
