中空夹层钢管混凝土刚性双层法兰受弯性能试验研究  

EXPERIMENTAL STUDY ON FLEXURAL PERFORMANCE OF RIGID DOUBLE-RING FLANGE CONNECTED TO CONCRETE-FILLED DOUBLE-SKIN STEEL TUBE

作　　者：陈哲[1,2] 邢月龙[3] 郭勇[3] 陈勇[4] 王激扬[4] 

机构地区：[1]华北电力大学,北京102206 [2]国家电网浙江省电力公司,杭州310007 [3]浙江省电力设计院,杭州310012 [4]浙江大学土木工程学院,杭州310058

出　　处：《钢结构》2015年第7期6-11,18,共7页Steel Construction

基　　金：国家电网浙江省电力公司科技项目(KXK2013-007;5211UZ1400AW)

摘　　要：中空夹层钢管混凝土输电杆塔的连接节点采用新型内外双层法兰形式。针对该法兰的抗弯性能问题,设计并实施纯弯承载力试验。通过加载试验,对法兰钢管及肋板上的应变随荷载变化的情况进行分析,两者给出较为一致的法兰截面的中和轴位置。通过研究法兰螺栓应变,揭示法兰内、外螺栓内力分布规律。试验结果表明,中和轴和旋转轴位置随弯矩变化,并且若将中和轴视为旋转轴进行计算会导致计算得出的承载力偏小。A new double-ring flange was adopted as the connecting joints in the pole towers that were constructed by using concrete filled double-skin steel tube （CFDSS）. For the problem of flexural performance of this flange,a pure bending experiment setup were designed and carried out. The variation of the strain distributions on the tube and ribbed slabs were analyzed through experimental study. The locations of neutral axis achieved based on the strain distribution on outer tube and that on ribbed slabs respectively had shown a good agreement. The distribution rule of the internal forces in both inner and outer ring bolts was revealed through the study on the strain gauge results of the bolts. The experimental results also indicated that the locations of neutral axis and rotational axis changed with the bending loading. Moreover,it would lead to a relative smaller bearing capacity if neutral axis was regarded as rotational axis in calculation.

关 键 词：中空夹层钢管混凝土 法兰 试验研究 抗弯性能 中和轴 

分 类 号：TU398.9[建筑科学—结构工程]