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Experimental and Finite Element Analysis of New Type of Cross-Shaped Gusset-Plate Support Connections to Slotted Tubular Memebers
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摘要: 为研究新型十字管板支座节点的受力性能及破坏机理,设计4个管板支座节点试件进行单调静力加载试验。试验研究参数为板厚及荷载形式,考察节点破坏模式、极限承载力、节点位移、节点区不同部位(圆管、横向节点板及纵向节点板)应变分布等性能指标,并对影响节点试件性能指标的参数(管壁厚度、管径、节点板厚度、支管数量)进行有限元参数化分析。结果表明:管板支座节点在管上轴心荷载作用下均出现节点板破坏及圆管破坏两种形式;管壁厚度与板厚度的相对关系主要决定节点塑性变形能力;两管相贯节点中,当节点板厚度大于管壁厚度时,圆管与管板交界处发生破坏,为延性破坏;当节点板厚度小于管壁厚度,节点板底部压屈或拉断,为脆性破坏;四管相贯节点中,节点板厚度应为2倍管壁厚度以保证节点塑性发展及极限承载力。Abstract: In order to investigate the mechanical properties and failure mechanism of the new type of gusset-plate connections to slotted tubular members, four specimens of this kind of joint were designed for monotonic static loading test. The test parameters studied included plate thickness and load form. The failure mode, joint ultimate bearing capacity of joint, joint displacement and strain distribution of different parts of the joint (circular tube, transverse gusset-plate and vertical gusset-plate) were discussed. The structural parameters affecting the performance indexes of joint specimens (tube wall thickness, tube diameter, plate thickness and number of branches) were analyzed by finite element parametric analysis. Results indicated that there were two types of joint failure modes, gusset-plate failure and tube failure, under the action of axial load on tube; the relative relations between tube wall thickness and gusset-plate thickness mainly determined the plastic deformation capacity of joints. For the joint specimens with two branches, when the thickness of the gusset-plate was greater than that of the tube wall, the specimen failed at the junction of the circular tube and gusset-plate, and this damage was ductile failure; when the thickness of the gusset-plate was less than that of the tube wall, the specimen bent or broke at the bottom of the gusset-plate, and this damage was brittle failure. For the joint specimens with four branches, the gusset-plate thickness should be 2 times the tube wall thickness to ensure the plastic development and ultimate bearing capacity of the joint.
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