为改善钢筋混凝土柱-钢梁（reinforced concrete columns and steel beam,RCS）节点的抗震性能，在柱贯通型RCS节点的基础上，提出了一种盒式RCS节点。通过对4个RCS盒式节点试件的低周往复加载试验，研究了节点的破坏特征、受力特点和抗震性能，分析了节点梁端附加盖板加强、内部腹板间距和厚度对试件破坏模式、滞回耗能特性及变形的影响。结果表明：试件的破坏集中在柱端和梁端，节点区未发生失效，满足“强节点弱构件”的设计要求；试件破坏时，其延性系数均大于3.0，等效黏滞阻尼系数在0.16~0.27的范围内，具有较好的抗震性能；RCS盒式节点的剪力主要由内部腹板承担，而外部侧板主要起箍筋作用并承受部分剪力；加大内部腹板间距会减小对钢梁端板的约束，使内部腹板、外部侧板、钢梁端板和钢梁翼缘的应变减小；盖板会增加梁端抗弯刚度并增强钢梁端板的约束，使钢梁翼缘的应变减小，内部腹板和钢梁端板的应变显著增加；加厚内部腹板会增加钢梁端板的约束，使钢梁翼缘的应变显著增加，钢梁端板的应变略有增加，内部腹板的应变略有减小。盒式节点设计时应适当增大内部腹板间距并选用较大的板厚。研究成果可为该类RCS盒式节点设计提供参考。
Abstract
Here, to improve aseismic performance of RC column-steel beam (RCS) joints, a box type RCS joint was proposed based on the column through type RCS joint. Based on low cycle repeated loading tests of 4 RCS box type joints, their failure characteristics, load-bearing characteristics and aseismic performance were studied. Effects of reinforcement of additional cover plate at the beam end, inner web spacing and thickness on failure mode, hysteretic energy dissipation characteristics and deformation of the joints were analyzed. The results showed that failure of joint specimens is concentrated in column end and beam end, and joint zone has no failure to meet the design requirement of “strong joint and weak member”; when specimens are damaged, their ductility coefficients are larger than 3.0, and their equivalent viscous damping coefficient are within the range of 0.16-0.27 to have good aseismic performance; joints’ shear forces are mainly exerted on inner web, while outer side plate mainly acts as stirrup and is subjected to parts of shear forces; increasing spacing of inner webs can reduce restraint on end plate of steel beam and strains of inner webs, outer side plates, end plate of steel beam and flange of steel beam; cover plate can increase bending stiffness of beam end and strengthen constraint of end plate of steel beam to reduce strain of flange of steel beam, and significantly increase strain of inner webs and end plate of steel beam; thickening inner webs can strengthen restraint of steel beam end plate to significantly increase strain of steel beam flange, slightly increase strain of steel beam end plate, and slightly decrease strain of inner web; designing box type joints should appropriately increase inner web spacing and choose larger plate thickness; the study results can provide a reference for designing RCS box type joints.
关键词
RCS组合节点 /
拟静力试验 /
抗震性能 /
抗剪承载力
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Key words
RCS joints /
quasi-static test /
aseismic performance /
shear capacity
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