广西大学学报(自然科学版)
廣西大學學報(自然科學版)
엄서대학학보(자연과학판)
JOURNAL OF GUANGXI UNIVERSITY (NATURAL SCIENCE EDITION)
2015年
4期
869-875
,共7页
焦晋峰%马霄%雷宏刚%张建丽
焦晉峰%馬霄%雷宏剛%張建麗
초진봉%마소%뢰굉강%장건려
伞形空间钢桁架结构%焊接钢管相贯节点%加劲肋措施%有限元分析
傘形空間鋼桁架結構%銲接鋼管相貫節點%加勁肋措施%有限元分析
산형공간강항가결구%한접강관상관절점%가경륵조시%유한원분석
umbrella-shaped space steel truss structure%welded steel tubular intersecting joints%stiffeners%finite element analysis
空间焊接相贯节点受力复杂,对大尺寸、多平面支管及空间多向加载作用下相贯节点的承载力设计方法,目前相关的设计规范并未给出详细规定。因此,有必要针对焊接钢管相贯节点在空间多向加载作用下的性能进行分析。以山西省太原南站为工程背景,选取其屋盖结构———伞形空间钢桁架下弦节点为研究对象,采用ABAQUS对其进行有限元分析,计算了节点在空间多向加载作用下的应力、变形分布,并重点探讨节点相贯区域内不同加劲构造措施对节点强度和刚度的影响。分析结果表明:支管与主管相贯区域为节点受力最不利位置,尤以受拉支管与主管汇交处最为明显;圆形截面支管屈服先于矩形截面支管;相对于“井字形加劲肋”构造,“横隔板+纵向加劲肋”构造有效提高节点承载能力,但在纵向加劲肋与横隔板相交处,存在局部塑性变形。
空間銲接相貫節點受力複雜,對大呎吋、多平麵支管及空間多嚮加載作用下相貫節點的承載力設計方法,目前相關的設計規範併未給齣詳細規定。因此,有必要針對銲接鋼管相貫節點在空間多嚮加載作用下的性能進行分析。以山西省太原南站為工程揹景,選取其屋蓋結構———傘形空間鋼桁架下絃節點為研究對象,採用ABAQUS對其進行有限元分析,計算瞭節點在空間多嚮加載作用下的應力、變形分佈,併重點探討節點相貫區域內不同加勁構造措施對節點彊度和剛度的影響。分析結果錶明:支管與主管相貫區域為節點受力最不利位置,尤以受拉支管與主管彙交處最為明顯;圓形截麵支管屈服先于矩形截麵支管;相對于“井字形加勁肋”構造,“橫隔闆+縱嚮加勁肋”構造有效提高節點承載能力,但在縱嚮加勁肋與橫隔闆相交處,存在跼部塑性變形。
공간한접상관절점수력복잡,대대척촌、다평면지관급공간다향가재작용하상관절점적승재력설계방법,목전상관적설계규범병미급출상세규정。인차,유필요침대한접강관상관절점재공간다향가재작용하적성능진행분석。이산서성태원남참위공정배경,선취기옥개결구———산형공간강항가하현절점위연구대상,채용ABAQUS대기진행유한원분석,계산료절점재공간다향가재작용하적응력、변형분포,병중점탐토절점상관구역내불동가경구조조시대절점강도화강도적영향。분석결과표명:지관여주관상관구역위절점수력최불리위치,우이수랍지관여주관회교처최위명현;원형절면지관굴복선우구형절면지관;상대우“정자형가경륵”구조,“횡격판+종향가경륵”구조유효제고절점승재능력,단재종향가경륵여횡격판상교처,존재국부소성변형。
The forces that the spatial welded steel tubular joints bear are complicated, and there is no design code for the load carrying capacity of large scale welded steel tubular joints as well as branch pipes in the multiple planes and under the multi-direction spatial loading. Therefore, it is necessary to analyze the performance of welded steel tubular joints under multi-direction spatial load-ing. Considering the bottom chord in the umbrella-shaped roof structure of the South Railway Station of Taiyuan,‘the ten major constructions in Shanxi Province’ , the distribution of stress and deforma-tion of the joints under multi-direction spatial loading were calculated using the finite element analy-sis software ABAQUS, and the strength and the stiffness of the joints influenced by different stiffener arrangement in the intersecting area of the joints were discussed. The results indicate that the inter-secting area between the branch duct and main duct is the most unfavorable position of the joints, especially in the area between main duct and pull tube; that the circular branch yields before the rectangular branch; that the structure reinforced by ‘diaphragm combined with longitudinal ribs ’ has a higher load carrying capacity than that reinforced by ‘well-shaped ribs’ , but there are local plastic deformation in the intersecting area.