冷彎薄壁方鋼管混凝土梁柱節(jié)點(diǎn)抗震性能試驗(yàn)研究*
姚勇，褚云朋，張兆強(qiáng)，鄧勇軍
- 摘 要
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（西南科技大學(xué)土木工程與建筑學(xué)院， 綿陽(yáng) 621010）［摘要］冷彎薄壁型鋼結(jié)構(gòu)房屋中桿件壁板較薄，梁柱節(jié)點(diǎn)連接區(qū)域常發(fā)生柱板件被拉裂現(xiàn)象。向薄壁柱內(nèi)灌入低強(qiáng)度混凝土，可有效提高梁柱節(jié)點(diǎn)抵抗外荷載的能力。開展4種類型共8個(gè)節(jié)點(diǎn)在不同軸壓比下的低周往復(fù)加載試驗(yàn)，探討節(jié)點(diǎn)抗震性能。結(jié)果表明：普通空鋼管柱焊接節(jié)點(diǎn)破壞前所經(jīng)歷的循環(huán)次數(shù)較少，節(jié)點(diǎn)域部位焊縫及焊縫附近板件發(fā)生斷裂；加腋節(jié)點(diǎn)極限承載力比普通焊接節(jié)點(diǎn)提高很多，耗能能力較強(qiáng)，破壞時(shí)加腋端梁截面局部屈曲，其承載力比螺栓貫穿式節(jié)點(diǎn)承載力高；鋼管混凝土柱直接焊接節(jié)點(diǎn)在一定程度上抑制了節(jié)點(diǎn)域柱板件斷裂，螺栓貫穿式節(jié)點(diǎn)梁端板件發(fā)生斷裂和梁與端板連接的焊縫也被拉裂；軸壓比對(duì)空鋼管柱節(jié)點(diǎn)的抗震性能影響較大，但對(duì)鋼管混凝土柱節(jié)點(diǎn)影響較小。［關(guān)鍵詞］冷彎薄壁方鋼管梁柱節(jié)點(diǎn); 往復(fù)加載; 抗震性能; 破壞模式中圖分類號(hào)：TU398+.9 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)22-0001-04Experimental research on seismic behavior of beam-column nodes with concrete filled cold-formed thin-walled square steel tubesYao Yong, Chu Yunpeng, Zhang Zhaoqiang, Deng Yongjun(College of Civil Engineering, Southwest University of Science and Technology, Mianyang 621010, China)Abstract: Due to the thin wall of cold-formed thin-walled square steel tube structure, it often suffers from cracking failure in beam-column node regions. With low-strength concrete in the thin-walled column, the ability to resist external loads of the beam-column nodes can be improved effectively. To explore the seismic behavior of the nodes, low cyclic loading test was carried out of four types(8 nodes) with different axial compression ratio. Results show that the ordinary hollow steel tub column welded nodes experience less loading cycles before failed, while welds in the nodes and the plates near them are fractured. The ultimate bearing capacity and energy dissipation capacity of the haunched beam-column nodes are larger than those of the ordinary welded node. Beam section near the end of haunched plate is local buckling at failure, the bearing capacity is larger than that of the node with bolts. To a certain degree, the concrete filled cold-formed tube column welded node can inhibit the fracture of column members in node regions, plates fracture and welds fracture between the beam and the end plate in the node with bolts. Axial compression ratio has great effect on the seismic behavior of the hollow steel tube column nodes, but has little effect on the concrete filled steel tube column nodes.Keywords: beam-column nodes of cold-formed thin-walled square steel tube; repeated loading; seismic behavior; failure mode*國(guó)家高技術(shù)研究發(fā)展支撐計(jì)劃(863計(jì)劃)項(xiàng)目(2009AA032304),四川省科技支撐計(jì)劃項(xiàng)目（2011GZ0043）,四川省教育廳基礎(chǔ)研究項(xiàng)目（12ZB157）。作者簡(jiǎn)介：姚勇，教授，Email: yy001221@163.com。參考文獻(xiàn)［1］姚勇，褚云朋，鄧勇軍，等. 低層冷彎薄壁型鋼結(jié)構(gòu)體系動(dòng)靜性能數(shù)值模擬［J］. 建筑結(jié)構(gòu). 2011，41(2)：41-45.［2］褚云朋，姚勇，王汝恒，等. 冷彎薄壁方鋼管梁柱節(jié)點(diǎn)抗震性能試驗(yàn)研究［J］. 土木工程學(xué)報(bào). 2012，45(6)：101-109.［3］GB 50018—2002冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范［S］.北京：中國(guó)計(jì)劃出版社，2002.［4］GB/T 228—2002金屬材料室溫拉伸試驗(yàn)方法［S］.北京：中國(guó)標(biāo)準(zhǔn)出版社，2002.［５］ＪＧJ 101—96建筑抗震試驗(yàn)方法規(guī)程［Ｓ］．北京：中國(guó)建筑工業(yè)出版社，1997.
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