耳板式组合桁架节点试验及有限元分析
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摘要
以某槽形梁-钢桁组合结构桥梁下弦节点为原型,根据相似理论,制作了3个1∶3的节点模型。通过对模型进行水平单调静力加载和有限元模拟分析,对节点的破坏形态、极限承载力及各组成构件的受力性能进行了研究。结果表明:节点模型的破坏形态主要包括受压腹杆局部屈曲和节点核心区混凝土的开裂;节点核心区刚度大,承载力高,PBL剪力键群和节点板能有效地将弦杆和腹杆连接成整体;采用有限元软件对节点进行分析合理可行。
Three joint models of 1∶ 3 scales were made according to the similarity theory based on the prototype of joints of bottom chords of a channel beam-steel truss composite structure bridge. The monotonous static horizontal load test and finite element simulation analysis were carried out on the models to investigate the failure modes,ultimate bearing capacities of joints and mechanical behaviors of different components. The results indicate that the failure modes of the joints mainly include the buckling failure of compressed web member and the concrete cracking failure in joint core region. The joint core region has high stiffness and great bearing capacity. The chord members and web members can be connected as a whole effectively through the PBL shear bond groups and the joint plates. It is reasonable and feasible to use the finite element software to analyze the joints.
Three joint models of 1∶ 3 scales were made according to the similarity theory based on the prototype of joints of bottom chords of a channel beam-steel truss composite structure bridge. The monotonous static horizontal load test and finite element simulation analysis were carried out on the models to investigate the failure modes,ultimate bearing capacities of joints and mechanical behaviors of different components. The results indicate that the failure modes of the joints mainly include the buckling failure of compressed web member and the concrete cracking failure in joint core region. The joint core region has high stiffness and great bearing capacity. The chord members and web members can be connected as a whole effectively through the PBL shear bond groups and the joint plates. It is reasonable and feasible to use the finite element software to analyze the joints.
引文
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[3]周凌宇,王海波,贺桂超.采用PBL连接件的组合桁架节点受力性能[J].中南大学学报(自然科学版),2012,43(7):2762-2767.
[4]周凌宇,张花.小比例尺组合桁架内含式节点试验研究[J].铁道科学与工程学报,2011,8(4):14-18.
[5]周凌宇,张花,贺桂超.耳板式钢-混凝土组合桁架节点力学性能试验研究[J].中国铁道科学,2011,32(6):41-47.
[6]余志武,丁发兴.混凝土受压力学性能统一计算方法[J].建筑结构学报,2003,24(4):41-46.
[7]CEB-FIP Model Code90[S].Lausanne:Thomas Telford,1993.
[8]丁发兴,余志武.混凝土受拉力学性能统一计算方法[J].华中科技大学学报(城市科学版),2004,21(3):29-34.
[2]野村敏雄,大野了,加藤敏明.PC複合トラス橋格点部の構造特性に関する研究(その2)-静的はり模型載荷実験による耐荷性能に関する検討[J].大林組技術研究所報,2005,69:1-6.
[3]周凌宇,王海波,贺桂超.采用PBL连接件的组合桁架节点受力性能[J].中南大学学报(自然科学版),2012,43(7):2762-2767.
[4]周凌宇,张花.小比例尺组合桁架内含式节点试验研究[J].铁道科学与工程学报,2011,8(4):14-18.
[5]周凌宇,张花,贺桂超.耳板式钢-混凝土组合桁架节点力学性能试验研究[J].中国铁道科学,2011,32(6):41-47.
[6]余志武,丁发兴.混凝土受压力学性能统一计算方法[J].建筑结构学报,2003,24(4):41-46.
[7]CEB-FIP Model Code90[S].Lausanne:Thomas Telford,1993.
[8]丁发兴,余志武.混凝土受拉力学性能统一计算方法[J].华中科技大学学报(城市科学版),2004,21(3):29-34.