宁波大学学报（理工版）
寧波大學學報（理工版）
저파대학학보（리공판）
Journal of Ningbo University (Natural Science & Engineering Edition)
2015年
4期
53-58
,共6页
童科挺%王万祯%郭戈%王伟焘%孙韶江
童科挺%王萬禎%郭戈%王偉燾%孫韶江
동과정%왕만정%곽과%왕위도%손소강
箱型柱-H 型钢梁节点%椭球面断裂模型%椭球面屈服模型%扩大头%塑性转角%承载力
箱型柱-H 型鋼樑節點%橢毬麵斷裂模型%橢毬麵屈服模型%擴大頭%塑性轉角%承載力
상형주-H 형강량절점%타구면단렬모형%타구면굴복모형%확대두%소성전각%승재력
joints of steel box column and H-style steel beam%elliptical fracture model%elliptical yield model%enlarged junctures%plastic rotation%load bearing capacity
为研究箱型柱-H 型钢梁节点在强震时的脆断机理和延性节点构造，对4个隔板贯通式箱型中柱-H 型钢梁节点试验(1个常规节点和3个对接焊缝扩大头及梁翼缘圆孔削弱型节点)进行了低周往复循环加载试验和基于结构钢椭球面断裂模型及偶联的椭球面屈服模型的断裂分析.结果表明：隔板贯通式箱型中柱-H 型钢梁常规节点在应力高度集中的梁翼缘对接焊缝处脆断；扩大头构造消除了对接焊缝沿梁翼缘宽度的几何突变，降低了对接焊缝的应力集中程度和脆断风险；梁翼缘上开设的圆孔构造促使塑性铰形成于远离节点区的梁削弱截面；对接焊缝扩大头及梁翼缘圆孔削弱型节点的承载力较常规节点降低5.5%~9.4%.
為研究箱型柱-H 型鋼樑節點在彊震時的脆斷機理和延性節點構造，對4箇隔闆貫通式箱型中柱-H 型鋼樑節點試驗(1箇常規節點和3箇對接銲縫擴大頭及樑翼緣圓孔削弱型節點)進行瞭低週往複循環加載試驗和基于結構鋼橢毬麵斷裂模型及偶聯的橢毬麵屈服模型的斷裂分析.結果錶明：隔闆貫通式箱型中柱-H 型鋼樑常規節點在應力高度集中的樑翼緣對接銲縫處脆斷；擴大頭構造消除瞭對接銲縫沿樑翼緣寬度的幾何突變，降低瞭對接銲縫的應力集中程度和脆斷風險；樑翼緣上開設的圓孔構造促使塑性鉸形成于遠離節點區的樑削弱截麵；對接銲縫擴大頭及樑翼緣圓孔削弱型節點的承載力較常規節點降低5.5%~9.4%.
위연구상형주-H 형강량절점재강진시적취단궤리화연성절점구조，대4개격판관통식상형중주-H 형강량절점시험(1개상규절점화3개대접한봉확대두급량익연원공삭약형절점)진행료저주왕복순배가재시험화기우결구강타구면단렬모형급우련적타구면굴복모형적단렬분석.결과표명：격판관통식상형중주-H 형강량상규절점재응력고도집중적량익연대접한봉처취단；확대두구조소제료대접한봉연량익연관도적궤하돌변，강저료대접한봉적응력집중정도화취단풍험；량익연상개설적원공구조촉사소성교형성우원리절점구적량삭약절면；대접한봉확대두급량익연원공삭약형절점적승재력교상규절점강저5.5%~9.4%.
In order to study the fracture mechanism, the test on ductile joints of steel box column for the H-style steel beam under the seismic loading and low cyclic reversed loading is conducted on four diaphragm-through type joints of steel box interior column and H-style steel beam, including one conventional joint and three joints with enlarged juncture and opening holes in the beam. The test is based on an elliptical fracture model coupled with an elliptical yield model of constructional steel. The results show that the conventional joint brittle fractures at butt weld between beam flange and diaphragm where the stress is highly concentrated. Enlarged juncture eliminates geometry mutation of butt welds along the beam flange width, and reduces the degree of stress concentration and the risk of brittle fracture of the butt weld. Plastic hinge causes the weaken beam section distant from the panel zone due to the opening holes at beam flanges. The load bearing capacity of the joint with enlarged juncture and opening holes at the beam flanges reduces by 5.5%~9.4% compared with that of the conventional joint.
