论文部分内容阅读
通过2个火灾后型钢混凝土柱-钢梁节点以及1个常温下型钢混凝土柱-钢梁节点的低周反复加载试验对比,研究火灾作用及受火时间对型钢混凝土柱-钢梁节点的抗震性能的影响。结果表明:火灾后型钢混凝土柱-钢梁节点的破坏形态与常温下的基本相似。由于核心型钢的抗剪作用,火灾后型钢混凝土柱-钢梁节点的最大承载力变化不大,但与最大荷载对应的位移增加,试件的刚度减小,后期变形能力减弱。与常温下的试件相比,火灾后型钢混凝土柱-钢梁节点的延性与耗能能力降低,且随着受火时间的增加,降低程度增大,但总体而言,试件的位移延性系数和等效阻尼比仍能维持较高水平,火灾后型钢混凝土柱-钢梁节点的抗震性能仍较好。
By comparing the low-cycle repeated loading test of two post-fire steel reinforced concrete columns-steel beam nodes and one steel-concrete column-steel beam node at normal temperature, the effects of fire action and fire exposure time on the seismic behavior of SRC- Impact. The results show that the failure modes of post-fire steel-reinforced concrete column-steel beam joints are basically similar to those at normal temperature. Due to the shearing effect of core steel, the maximum bearing capacity of post-fire steel reinforced concrete column-steel beam joints has little change, but the displacement corresponding to the maximum load increases, the rigidity of the specimen decreases, and the post-deformation capacity decreases. Compared with the specimen at room temperature, the ductility and energy dissipation capacity of the post-fire SRC-steel beam joints decrease, and the degree of reduction increases with the increase of fire time, but generally, the displacement ductility The coefficient and equivalent damping ratio can still be maintained at a high level, and the post-fire steel-reinforced concrete column-steel beam joints have better seismic performance.