60万kW高温气冷堆核电厂钢板混凝土剪力墙竖向荷载作用下单面耐火性能试验研究

EXPERIMENTAL RESEARCH ON SINGLE-SIDED FIRE RESISTANCE OF SC SHEAR WALL UNDER VERTICAL LOAD IN HTR-PM600 NUCLEAR PLANT

结合高温气冷堆(HTR-PM600)项目工程需要,对核岛厂房结构采用的双侧钢板混凝土剪力墙(SC剪力墙)开展了单面耐火性能试验研究。基于4个具有相同轴压比的SC剪力墙典型试件在ISO834标准温升曲线作用下的单面受火试验结果,对比剪力墙墙厚、两侧钢板厚度、对拉构造等参数对试件单面受火下隔热性能的影响,得到了SC剪力墙的截面温度场分布规律、竖向变形、损伤模式、耐火极限等指标。试验结果表明:4个SC剪力墙试件受火面钢板均有轻微损伤,但背火面钢板基本保持完好;剪力墙截面总厚度对其单面受火条件下的耐火极限影响显著,受火侧外包钢板厚度对炉内温度与受火面混凝土的温差也有一定影响;SC剪力墙结构在两侧较大温差条件下具有良好的竖向承载能力及耐火性能。

According to the project requirements of HTR-PM600, the single-sided fire resistance test of double-steel-plate concrete shear wall(SC shear wall) structure in nuclear power plant was carried out. Based on the single-sided ISO834 standard fire test of 4 typical specimens under the same axial compression ratio, the effects of wall thickness of SC shear wall, the thickness of steel plates on otherside, tie rod structure, etc. on the thermal insulation property of specimens were analyzed and compared. The temperature field distribution across the cross section, vertical deformation, damage mode, fire resistance, etc. of the SC shear walls subjected to sigle-sided fire exposure were ascertained. The test results showed that the steel plates on the fire surface of the four SC shear wall specimens were slightly damaged, but the steel plates on the back fire surface were basically intact. The total thickness of shear wall section had a significant effect on the fire resistance of one side under fire condition, and the thickness of outer steel plate on fire side also had a certain effect on the temperature difference between the furnace temperature and the concrete on fire surface. SC shear wall structure had good vertical bearing capacity and fire resistance under large temperature difference on both sides.