变截面方钢管轻骨料混凝土边柱-箱梁节点抗震性能试验和承载力研究
首发时间:2018-07-11
摘要:对折线隔板贯通变截面方钢管轻骨料混凝土边柱-箱梁节点进行了循环加载试验,获得了该类节点的破坏模式、滞回曲线、塑性转角、耗能能力、节点域应变演化等抗震性能指标。结果显示,上隔板与小截面柱间焊缝的剪应变远大于下隔板与大截面柱间焊缝;基本型节点在几何突变剧烈的梁翼缘对接焊缝侧边、梁腹板角焊缝端点及构造复杂的梁腹板焊接工艺孔处脆断;折线隔板节点的典型破坏模式为折线隔板段形成塑性铰、极限加载时焊接工艺孔处梁腹板屈曲和开裂、塑性铰区隔板断裂、梁腹板竖向角焊缝开裂。基于节点试验破坏情况,建议了节点域的抗弯、抗剪计算模型,推导了节点域的抗弯、抗剪承载力计算公式。
关键词: 结构工程 变截面方钢管轻骨料混凝土柱 折线隔板贯通节点 承载力 塑性转角 计算公式
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Study on bearing capacity and seismic performance tests on joints of lightweight aggregate concrete-filled square steel tubular column with variable sections and steel box beam
Abstract:Low cycle loading tests were carried out on linear enlarged diaphragm-through exterior joints of lightweight aggregate concrete-filled square steel tubular column with variable sections and box beam. Seismic performance indexes, such as failure mode, hysteresis loops, plastic rotation, energy dissipation, strain evolution of panel zone are obtained. The test results show that the shear strain of weld between upper diaphragm and columns with small section is much larger than that of bottom diaphragm and columns with large section. The basic joint brittle fractures at edges of butt weld of beam flanges where the geometry changes sharply, the end of fillet weld of beam webs and column walls and the welding process holes of beam webs with complex geometric construction. The typical failure modes of joints with linear enlarged diaphragms are plastic hinges formed in linear enlarged diaphragms, buckling and crack of beam webs near welding process hole at ultimate loading, fracture of liner enlarged diaphragms at plastic hinges zone and fillet welds of beam webs between column walls. Based on the analysis of the test results, the calculation models of bending and shear are established for panel zones of the irregular joints and calculation formula of bending and shear capacity are presented for the irregular joint under compression and bending.
Keywords: structural engineering lightweight aggregate concrete-filled square steel tubular column with variable sections joint with linear enlarged through diaphragms loading bearing capacity plastic rotation calculation formula
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变截面方钢管轻骨料混凝土边柱-箱梁节点抗震性能试验和承载力研究
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