钢管混凝土梁柱新型连接节点抗震性能试验

Seismic behavior of a new CFST column-to-beam connection

为进一步研究钢管混凝土桥墩在地震作用下的变形与破坏机理,促进钢管混凝土墩柱在桥梁中的应用,提出一种新型的钢管混凝土梁柱节点,并对新型节点试件与传统一体化浇筑的节点试件进行了轴压和水平低周反复荷载共同作用下的试验.考察了节点不同浇筑方式、钢管柱不同埋深、选用不同屈服强度钢管对该类节点的抗震性能的影响,对节点破坏形式、滞回曲线、变形能力、累积耗能等抗震指标进行对比分析.结果表明:新型节点试件相对传统节点,钢管与混凝土粘结良好,无明显滑移或脱开破坏;试件的延性和耗能都相对于传统节点试件稍有提高.对于设计为耗能元件的构件,柱选用屈服强度低的钢管比屈服强度高的钢管耗能效果更好,并且能够更好的保证连接梁的完整性.

In order to achieve a further understanding of the nonlinear behaviors and damage mechanism of concrete-filled steel tubular( CFST) piers,a new type of CFST column-to-cap beam connection was proposed. The proposed connections and corresponding traditional monolithic connections were tested under combined axial loading and lateral quasi-static loading. The connections with different casting methods,different CFST column embed length,different CFST tube yield strength were constructed. Their damage modes,hysteretic curves,ductile capacity and accumulation energy dissipating were studied compared with each other. Research results indicate that the CFST column-to-cap beam connections with replaceable components perform a good bonding capacity. The ductility and earthquake energy dissipating capacity of the proposed connection is better than that of the traditional monolithic connection. Furthermore,for those connections designed as endergonic members,steel tubes with low yield stress perform a better energy dissipating than that of steel tubes with high yield stress,which will decrease the cap beam's damage by a large extent.