为有 效改 善钢 一混 凝 土连续 组合 桁 梁桥 负弯矩 区受力性 能 ,以天 津 海 河 吉兆桥 为例 ,
总结连 续组 合桁 梁桥 的 主要设 计难 点 ,并对 传统 的解 决 方案进 行评 述 ,在 此基 础上 提 出综合 采 用部
分组 合技 术 、双 重 组 合技 术 以及 优 化 施 工 工 序 3项 措 施 对 吉 兆桥 进 行 优 化 设 计 。采 用 MIDAS
Civi1软 件 建立 吉 兆桥 边 上 1榀 组 合桁 架有 限元模 型 ,进 行 施 工 全过 程 分 析 ,检 验 3项 优 化措 施 的
有 效性 。对 比分析 结 果表 明 ,采 用此 3项技 术措施 可使 混凝 土桥 面板 在 荷 载短 期 效 应组 合 下始终
受压 ,下弦杆 钢板 最 大压应 力相 比不 灌 混凝 土 方 案 降低 了约 25 。 可见 ,合 理 采 用此 3项技 术措
施 可显 著 降低 钢 一混凝 土 连 续桁 梁桥 负弯矩 区混 凝 土桥 面板 的拉 应 力 和 下 弦杆 钢板 的 压 应 力 ,从
而有 效避 免 混凝 土桥 面板 开裂 ,改善 下 弦杆 的稳 定性 。
关键 词 :连 续桁 梁桥 ;钢 一混 凝土 组合 结构 ;受 力性 能 ;优 化 ;技 术措 施 ;有 限元 法 ■~
中 图分类 号 :U448.38 文献 标 志码 :A
Optim ization of M echanical Behavior of Steel and Concrete
Continuous Composite Truss Girder Bridge
ZHANG Zhen—xue ,NIE Jian—guo。,TAO M u—xuan ,ZH ULi
(1.School of Civil Engineering,Hebei University of Technology,Tianjin 300401,China;2.Key
Laboratory of Civil Engineering Safety and Durability of M inistry of Education,Department
of Civil Engineering,Tsinghua University,Beijing 100084,China)
Abstract:To effectively im prove the mechanical behavior of the hogging m oment area of the
steel and concrete continuous composite truss girder bridge,the Jizhao Bridge over Haihe Rive in
Tianjin was cited as an example.The major design difficulties of the composite truss girder bridge
were sum marized and the conventiona1 solutions to the difficulties were commented. Based on the
sum marization and com ments,three m easures of the partial com posite technique,double com pos—
ite techniques and optimized construction sequences were proposed for the optimal design of the
Jizhao Bridge.The software MIDAS Civi1 was used to set up the finite element model for a side
com posite truss of the bridge,the whole construction process of the bridge was analyzed and the
effectiveness of the three measures was checked. The results of comparative analysis reveal that
the application of the three m easures can keep the concrete deck slabs in com pression all the tim e
under the short—term com bination of load effect and can m ake the m aximum compressive stress in
the steel plates of the lower chord reduced by about 25 as compared to the design schem e that
the concrete iS not cast. It iS known herewith that the rational application of the measures can
significantly reduce the tensile stress in the deck slabs and the compressive stress in the stee1
plates of the lower chord in the hogging m oment area of the bridge,therefore can effectively avoid
cracking in the slabs and im prove the stability of the 1ower chord.
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