The mechanical behavior of L-shaped steel reinforced concrete (SRC) columns after exposure to high temperatures is investigated by conducting experiments on eight column specimens. The specimens are first heated to a target temperature and are loaded to failure after cooling down to room temperature. The effect of heating duration, loading eccentricities, and loading angles on the temperature distribution, failure mode and residual bearing capacity of the columns is studied. The test results show that L-shaped SRC columns under axial and eccentric loading have a post-high temperature shear and bending failure mode, respectively. The residual bearing capacity of the specimens decreases significantly (up to 1/3) compared to that at room temperature. The residual bearing capacity of L-shaped SRC columns is governed by loading eccentricities, and an eccentricity of 80 mm (0.36) leads to a reduction in residual capacity by 47% of its ambient value. The loading angle has an obvious effect on the damage range of L-shaped SRC columns. A formula for calculating the residual bearing capacity of L-shaped SRC columns under biaxially eccentric compression is proposed and validated against test results.

通过对八个圆柱试样进行实验，研究了L型钢筋混凝土（SRC）圆柱在暴露于高温后的力学行为。首先将样品加热到目标温度，然后冷却至室温后加载至失效。研究了加热时间，加载偏心率和加载角度对柱的温度分布，破坏模式和残余承载力的影响。试验结果表明，L形SRC柱在轴向和偏心荷载下分别具有高温后的剪切和弯曲破坏模式。与室温相比，样品的残余承载力显着降低（最高1/3）。L形SRC柱的残余承载力受载荷偏心率控制，80 mm（0.36）的偏心率会导致剩余容量减少其环境值的47％。加载角度对L型SRC柱的破坏范围有明显影响。提出了计算双轴偏心受压L型SRC柱残余承载力的公式，并针对试验结果进行了验证。