中文摘要：

该文进行了8个大比例型钢混凝土柱试件温度场和火灾后抗震性能试验,研究了升降温作用下柱试件的温度场分布规律以及火灾后受低周反复荷载时破坏规律。同时,考虑受火时间、轴压比、栓钉、含钢率等参数的影响,对火灾后型钢混凝土柱试件的典型破坏形态、滞回曲线的形状、加卸载刚度、承载能力等特性进行了系统的试验研究。研究表明：火灾升降温作用下,试件内部升温呈现出较大滞后性;火灾后柱试件出现了塑性铰区的破坏,受火时间越长,塑性铰长度越长;滞回环总体上呈梭形,耗能能力较好,滞回环有轻微的捏拢效应;随受火时间增加,试件承载能力降低;随轴压比增加,承载能力增加,延性降低;栓钉对试件承载能力影响不大。

英文摘要：

An experiment on the temperature field and post-fire seismic performance of steel reinforced concrete（SRC） columns was carried out, in which eight large-scale specimens were used in order to reduce the size effect. First, the temperature distribution and evolution of the specimens during a fire is studied. Then, a systematic experimental study on the hysteresis curve properties, stiffness, and load carrying capacity of the SRC columns is carried out, considering such parameters as heating time, axial compression ratio, and steel ratio. It can be concluded that the temperature increase in the interior of the specimens is slower than that of the fire temperature, and the temperature increase in the inner core of the specimens is slower than that of the exterior. A plastic hinge zone appears when the SRC column specimen is loaded to collapse after fire, and the length of the plastic hinge zone increases with an increase in heating time. In general, the hysteresis curve is spindle shaped except for a small pinch effect, which means the energy dissipation ability of the SRC column specimens is still good after a fire. The load carrying capacity of the specimens decreases with an increase in the heating time, and the load carrying capacity increases with an increase in the axial compression ratio. The ductility decreases with an increase in the axial compression, and the studs have little influence on the load carrying capacity.