(1 中国建筑科学研究院建筑防火研究所， 北京 100013； 2 中国建筑科学研究院西北分院， 西安 710061)

［摘要］以不同设防烈度区同类既有底框建筑的典型子结构作为研究对象，对比分析了转换层受火工况下6～8度区底框结构的抗火性能。结果表明：不同设防烈度区同类既有底框结构的地震抗力可转化为该类结构的抗火能力，高烈度区既有底框结构的抗火性能强于低烈度区同类型底框结构；除火灾荷载之外，轴压比是影响底框结构抗火性能的重要指标；火灾下，底框结构破坏的本质是静力与温度效应之和大于高温下构件的承载能力，与此同时，破坏构件的受力钢筋在一定范围内屈服，形成塑性铰。

［关键词］设防烈度； 底框结构； 抗火性能； 耐火极限

中图分类号：TU398-5文献标识码：A文章编号：1002-848X(2020)09-0072-07

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Research on fire resistance performance of similar existing masonry structure with bottom frame structure in different seismic fortification intensity areas

ZHANG Gengyuan1, QIU Canghu1, BAI Lianping2

(1 Institute of Building Fire Research, China Academy of Building Research, Beijing 100013, China；2 Northwest Branch, China Academy of Building Research, Xi′an 710061, China)

Abstract:Taking the typical substructures of similar masonry structures with bottom frame structure in different seismic fortification intensity areas as research objects, the fire resistance performance of the conversion layer of the structures under the fire working conditions in the 6～8 degree seismic fortification intensity areas was compared and analyzed. The results show that the seismic resistance of the same existing masonry structure with bottom frame structure in different seismic fortification intensity areas can be converted into the fire resistance performance of this type of structure, and the fire resistance performance of the existing masonry structure with bottom frame structure in the high seismic fortification intensity area is stronger than the same type of the structure in the low seismic fortification intensity area; in addition to fire loads, the axial pressure ratio is an important indicator that affects the fire resistance performance of the structure; under fire, the essence of the structural failure of the masonry structure with bottom frame structure is that the sum of the static and temperature effects is greater than the bearing capacity of the component at high temperature, and at the same time, the stressed steel bars of the damaged component yield within a certain range, forming a plastic hinge.

Keywords:seismic fortification intensity; masonry structure with bottom frame structure; fire resistance performance; fire endurance limit

*中国建筑科学研究院自筹基金科研项目(20190111330730002)，中国建筑科学研究院自筹基金科研项目（20150111330730047）。

作者简介：张耕源，硕士，助理工程师，Email:zhagy10@126.com。