部分预制装配型钢混凝土柱火灾后偏压试验研究

通过6个试件的火灾后偏压试验以及1个试件的常温下偏压试验，对配置活性粉末混凝土外壳的部分预制装配型钢混凝土（Partially Precast Steel Reinforced Concrete，PPSRC）柱和空心预制装配型钢混凝土（HollowPrecast Steel Reinforced Concrete，HPSRC）柱的火灾及火灾后偏压性能进行了对比分析。研究了受火时间、偏心率和核心混凝土强度对PPSRC柱及HPSRC柱的火灾下内部温度分布及火灾后剩余承载力、变形能力等方面的影响，并基于试验结构，对火灾下试件截面温度场进行了数值模拟分析。试验结果表明:火灾升温过程中试件截面测点温度存在明显的温度平台，火灾后试件的活性粉末混凝土外壳未发生爆裂现象，混凝土对型钢具有较好保护作用；模拟结果表明，截面温度及温度变化幅度由表及里逐渐降低，核心混凝土受到良好保护作用，温度相对较低；在偏压荷载下，火灾后试件的偏心受压破坏过程以及破坏形态和常温下类似，剩余承载力随火灾升温时间的增长和偏心率的增大而降低，随核心混凝土强度的增大而升高，试件的延性随核心混凝土的强度增大而增大。

EXPERIMENTAL STUDY ON POST-FIRE PERFORMANCE OF PARTIALLY PRECAST STEEL REINFORCED CONCRETE COLUMNS SUBJECTED TO ECCENTRIC COMPRESSION

To investigate the post-fire performance of eccentrically loaded partially precast steel reinforced concrete(PPSRC)columns and hollow precast steel reinforced concrete(HPSRC)columns,fire test and post-fire eccentric compression test of six specimens together with one control specimen unexposed to fire were carried out.Both PPSRC columns and HPSRC columns were fabricated with high-performance outer shells made of reactive powder concrete.The effects of fire time,eccentricity and strength of inner concrete on the internal temperature distribution under fire and the residual bearing capacity and deformability post fire were studied.Meanwhile,the temperature field of the specimens under fire was modelled.The test results indicated that the fire-damaged specimens experienced a similar failure mode compared with the control specimen unexposed to fire during the post-fire eccentric compression.The residual bearing capacity decreased with the increasing of fire heating time and eccentricity,and both the deformability and residual bearing capacity increased with the increasing of core concrete strength.