不等高H形钢梁-钢管再生块体混凝土柱异型节点抗震性能试验研究

为了研究左右不等高H形钢梁-钢管再生块体混凝土柱异型节点的抗震性能,对2个该类节点试件进行了往复加载试验,考察了再生块体混凝土取代率对节点抗震性能的影响,得到了节点的破坏形式,并建立了节点有限元分析模型,对其抗震性能进行了参数分析。结果表明:在圆钢管混凝土柱异型节点中使用再生块体混凝土,与不使用再生块体混凝土节点相比,其抗震性能差异很小;对于左右不等高H形钢梁-圆钢管混凝土柱异型节点,在加载过程中,上部节点域的应变大于下部节点域的,最终会导致上部节点域发生剪切破坏;在设计时,应以上部节点域作为节点抗剪设计的控制区域;对于合理设计的钢管壁厚,可以避免发生节点区钢管壁剪切破坏。

Experimental study on seismic behavior of irregularH-shaped steel beam-to-column joints filledwith concrete made of DCLs

In order to investigate the influence of replacement ratio of demolished concrete lumps (DCLs) on seismic performance of concrete filled tube (CFT) column joint, which consists of beams of unequal depth, and to explore the seismic performance and possible failure modes of the joint, two specimens were tested in cyclic loading. And proper finite element model was built up .It can be concluded that: compared with joints filled with traditional concrete, joints filled with concrete made of DCLs have similar seismic performance; for specimens under cyclic loading, the strain of the upper joint zone is greater than that of the bottom joint zone, eventually leading to a shear failure in the upper joint zone, which means the upper joint zone is the key in the design; if the joint is properly designed, shear failure in the joint zone can be avoided.