论文部分内容阅读
为研究H型截面钢柱在火灾中的行为,自行研制了柱火灾试验炉,对6个试件进行试验研究,考虑轴压比和柱端约束的不同。试验中测得了柱炉内烟气温度、钢柱截面温度、钢柱侧移、钢柱轴向变形和限制轴向变形后产生的附加轴压力。试验结果表明:裸露钢柱四面受火时,同一截面温度基本相同;钢柱高度相同时,各工况下轴向变形相差不大,增大柱端约束,轴向变形略小,若轴向变形受限制,轴压比增大,产生的附加轴力反而减小,但试件所受轴力总和并不一定小;钢柱在火灾中的行为,明显分为膨胀阶段和压缩阶段,其中主要是膨胀阶段,压缩阶段很短。膨胀阶段试件虽然温度已经很高,但能够稳定的承受所施加的荷载,此阶段侧向变形也较小。
In order to study the behavior of H-section steel columns in fire, a self-developed column fire test furnace was used to test 6 specimens, taking into account the difference between axial compression ratio and column end restraint. In the experiment, the flue gas temperature in the furnace, the section temperature of the steel column, the lateral displacement of the steel column, the axial deformation of the steel column and the additional axial pressure after limiting the axial deformation were measured. The experimental results show that the temperature of the same section is almost the same when exposed steel is exposed to fire on all sides. When the height of steel columns is the same, the axial deformation is not much different under different working conditions, Deformation is limited, axial compression ratio increases, resulting in additional axial force but decreased, but the sum of the axial force of the specimen is not necessarily small; steel column in the fire behavior, was clearly divided into the expansion phase and the compression phase, in which Mainly the expansion phase, the compression phase is very short. Although the temperature of the specimen in the expansion stage is already high, it can stably bear the applied load and its lateral deformation is also small at this stage.