【摘要】 为研究部分包覆钢-混凝土组合（steel-concrete partially encased composite,PEC）构件火灾下的传热性能，首先采用PEC构件标准火灾试验验证了二维有限元模型，然后对火灾下带有防火保护的PEC构件的升温过程及主要影响参数进行研究分析。研究表明，不同防火保护条件下，PEC构件H型钢腹板最高点温度均位于翼缘与腹板交点处，PEC构件截面温度最高点位置均位于翼缘端部。H型钢截面形状系数、翼缘厚度、腹板厚度以及H型钢高度、宽度等参数对PEC构件升温均有影响，其中影响较大的是翼缘厚度与H型钢宽度。通过将H型钢标准规格截面进行分组模拟，计算PEC构件在标准升温条件下所需防火层厚度，给出不同防火保护措施及不同耐火极限下，PEC构件防火层建议厚度设计值。更多还原

【Abstract】 In order to study the heat transfer performance of steel-concrete partially encased composite(PEC) structures under fire condition, a 2D finite element model was firstly validated by the standard fire test of PEC members. Then it was used to analyze the temperature rise process and main influencing parameters of PEC members with fire-proof under the ISO 834 standard temperature rise curve. The research shows that under different fire protection conditions, the highest temperature point of H-steel web is located at the intersection of flange and web, and the highest temperature point of the whole PEC member section is located at the lower left corner of the flange. H-steel section shape factor,flange thickness, web thickness, and H-section steel height and width all have an impact on the temperature rise of PEC member. And the major parameters are the thickness of the flange and the width of the H-steel. Through grouping simulation of H-steel with standard sections, the thickness of fire protection layer required by PEC structures under standard temperature rise condition is calculated. Then the suggested thickness design value of fire protection layer of PEC structures under different fire protection measures and different fire resistance limits is given.更多还原