装配整体式地铁车站纵断面方向梁板柱中节点抗震性能研究

结合北京某装配整体式地铁车站纵向梁板柱中节点的构造形式，设计制作了1个足尺预制拼装梁板柱中节点和1个作为对比的现浇整体梁板柱中节点试件。采用低周循环加载试验研究了两者的破坏形态、滞回特性、承载力、变形能力以及节点核心区的受力模式等。结果表明：预制拼装梁板柱中节点试件和现浇整体梁板柱中节点试件的变形能力基本相当；预制拼装梁板柱中节点试件的加载刚度明显高于现浇整体梁板柱中节点试件的，且位移延性系数约为现浇整体梁板柱中节点试件的1.65倍；预制拼装节点的拼装缝提高了其变形能力，但两者的破坏形态明显不同；现浇整体梁板柱中节点试件的裂缝密集均匀，主要分布在梁端、板端及节点核心区，而预制拼装梁板柱中节点试件的裂缝分布较为集中，主要分布在预制构件搭接拼装位置，尤其是叠合板结合面出现了劈裂破坏；梁端牛腿增加了节点核心区抗剪面积，提高了构件整体承载力；节点核心区受剪面积的增加以及梁端拼接缝的存在对“强节点弱构件”的抗震概念设计原则较为有利。

Study on seismic performance of beam-column-slab interior joints in longitudinal section of assembled monolithic subway station

According to the structure form of beam-column-slab interior joints in longitudinal section of the assembled monolithic subway station, a full-scale prefabricated beam-column-slab interior joint (PMJ-2) and a full-scale cast-in-place concrete beam-column-slab interior joint (CMJ-2) for comparison were designed and fabricated. The failure mode, hysteretic characteristic, bearing capacity, deformation capacity and stress state of core zone of the joints etc. were studied through low-cycle reversed loading test. The results show that the deformation capacity of the two beam-column-slab interior joints is approximately the same, but the loading-stiffness of PMJ-2 is larger than that of CMJ-2 evidently. The displacement ductility coefficient of PMJ-2 is about 1.65 times of that of CMJ-2. The deformation capacity of the specimen PMJ-2 is improved by the seams between assembled components. The crack failure modes of the specimens are obviously different. The distribution of cracks of the cast-in-place concrete beam-column-slab interior joint are homogeneous, but the distribution of cracks of the precast concrete joint are localized. The main regions of cracks are distributed along the plastic zone of beam, slab and core zone of joint, but the distribution of cracks of the prefabricated beam-column-slab interior joint is concentrated around the lapped seam between precast part and cast-in-place part of layered slab. The supporting corbel of beam leads to the increase of shear area in the core zone of joint. Thus, the overall bearing capacity of the specimen is improved. The increased shear area of the core zone of joint and the present of splicing seam are beneficial for achieving the design idea ‘strong-joint and weak-member’.