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工程力学  2014 

角钢塔K形节点初始转动刚度计算模型

DOI: 10.6052/j.issn.1000-4750.2012.11.0832, PP. 93-101

Keywords: 角钢塔K形节点,半刚性,组件法,初始转动刚度,虚功原理,单位荷载法

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Abstract:

运用组件法建立了输电塔中角钢塔K形节点初始转动刚度的计算模型,考虑了主角钢受剪、螺栓受剪、孔壁变形对节点转动刚度的影响。将主角钢受剪肢视为以剪切变形为主的短柱,采用叠加原理计算受剪肢的剪切变形,进而得到其转动刚度;将螺栓视为铁摩辛柯梁,采用虚功原理和单位荷载法求解其抗剪刚度。并结合5组足尺试验进行了修正,结果表明:该力学模型具有较好的适用性。通过参数分析可知,螺栓个数和螺栓间距是影响该类节点初始刚度最重要的因素,其他如主角钢肢宽和肢厚、螺栓直径、节点板厚度对初始刚度也有一定的影响。

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