论文部分内容阅读
为研究Q460高强度钢材箱形柱的抗震性能,对5个足尺试件进行了水平往复加载试验研究,分析了板件宽厚比、轴压比等因素对试件的承载力、破坏模式、耗能能力、变形能力和延性的影响。试验结果表明,Q460高强度钢材箱形柱具有很好的耗能能力和抗震性能,适用于抗震钢框架;除试件HB-1外其他试件本身及其柱脚节点均未发生焊缝开裂,证明设计合理、质量合格的Q460高强度钢材焊缝连接具有足够的承载力和良好的抗震性能;板件宽厚比越大,试件局部屈曲出现得越早,最大荷载对应的位移级越小,达到破坏时的位移级也越小;试件发生局部屈曲的范围及屈曲中心位置相对于试件截面高度的比值依次减小,所有试件最大屈曲位置距固定端0.25B～0.50B(B为等边箱型截面外边长),塑性区范围距离固定端0.72B～1.06B。根据试验结果,建议在轴压比不大于0.2时,Q460钢材箱形截面压弯构件板件宽厚比限值不应大于30;同时,钢框架柱在进行抗震设计时,其板件宽厚比限值应与轴压比相联系,轴压比越大,板件宽厚比限值应越小。
In order to study the seismic behavior of Q460 high-strength steel box columns, five full-scale specimens were subjected to horizontal reciprocating loading tests. The factors such as the aspect ratio and axial compression ratio of the specimens were analyzed. The bearing capacity, failure modes, Energy dissipation, deformation capacity and ductility. The test results show that the Q460 high strength steel box column has good energy dissipation capacity and seismic performance and is suitable for the seismic steel frame; no weld cracking occurs on the other specimens except the specimen HB-1 and its column nodes It is proved that the weld joint of Q460 high-strength steel with reasonable design and good quality has sufficient bearing capacity and good anti-seismic performance. The larger the plate thickness-thickness ratio, the earlier the local buckling of the specimen appears, the smaller the displacement level corresponding to the maximum load , And the displacement level at failure reached a smaller value. The range of local buckling and the ratio of the center of flexion to the height of specimen were decreased in turn, and the maximum buckling position of all specimens was 0.25B ~ 0.50B (B For equilateral box outside the cross-section), the plastic zone range from the fixed end 0.72B ~ 1.06B. According to the test results, it is suggested that the ratio of width to thickness of Q460 steel box girder should not be greater than 30 when the axial compression ratio is not more than 0.2. Meanwhile, when the steel frame column is designed for aseismic design, The value should be related to the axial pressure ratio, the greater the axial compression ratio, the plate thickness to thickness ratio should be smaller.