- 摘 要
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(1 中國建筑科學(xué)研究院建筑防火研究所， 北京 100013； 2 中國建筑科學(xué)研究院西北分院， 西安 710061)
［摘要］以不同設(shè)防烈度區(qū)同類既有底框建筑的典型子結(jié)構(gòu)作為研究對象，對比分析了轉(zhuǎn)換層受火工況下6～8度區(qū)底框結(jié)構(gòu)的抗火性能。結(jié)果表明：不同設(shè)防烈度區(qū)同類既有底框結(jié)構(gòu)的地震抗力可轉(zhuǎn)化為該類結(jié)構(gòu)的抗火能力，高烈度區(qū)既有底框結(jié)構(gòu)的抗火性能強(qiáng)于低烈度區(qū)同類型底框結(jié)構(gòu)；除火災(zāi)荷載之外，軸壓比是影響底框結(jié)構(gòu)抗火性能的重要指標(biāo)；火災(zāi)下，底框結(jié)構(gòu)破壞的本質(zhì)是靜力與溫度效應(yīng)之和大于高溫下構(gòu)件的承載能力，與此同時，破壞構(gòu)件的受力鋼筋在一定范圍內(nèi)屈服，形成塑性鉸。
［關(guān)鍵詞］設(shè)防烈度； 底框結(jié)構(gòu)； 抗火性能； 耐火極限
中圖分類號：TU398-5文獻(xiàn)標(biāo)識碼：A文章編號：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
*中國建筑科學(xué)研究院自籌基金科研項(xiàng)目(20190111330730002)，中國建筑科學(xué)研究院自籌基金科研項(xiàng)目（20150111330730047）。
作者簡介：張耕源，碩士，助理工程師，Email:zhagy10@126.com。
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