基于有限元法的大跨度索桥钢结构受力分析
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摘要
利用MIDAS/Civil有限元软件构建了大跨度悬索桥单缆结构和双缆结构体系下有限元模型,针对两种结构模型在汽车活载、横风荷载、自振频率结构特性和受力特征进行了模拟分析。研究结果表明:汽车活载作用下,双缆体系下的竖向挠度包络曲线位于单缆体系内侧,双缆结构加劲梁竖向挠度较单缆结构有所减小;横风荷载下,两种结构体系下的横向弯矩、挠度下的变化曲线较为类似,且双缆结构下的极值更大,在桥塔和跨中处加劲梁横向弯矩取得最大值,跨中处边跨挠度取得最小值,且主跨段挠度远大于边跨段挠度值;双缆结构的大跨度索桥一阶纵飘频率、横弯频率和扭转频率有所下降;一阶竖弯频率有所增加。从两种模型的分析结果表明,双缆结构大跨度悬索桥具有更优的受力特性和安全使用性能。
this paper,by using the finite element software MIDAS/Civil build large span suspension bridge single line structure and double spring structure system under finite element model,in view of the two kinds of structure models in automobile live load and horizontal wind load,the structure of the natural frequency of vibration characteristic and force characteristic has carried on the simulation analysis. The results show that the vertical deflection curve under the double cable system is in the inner part of the single cable system,and the vertical deflection of the double cable structure is less than the single cable structure. Under horizontal wind load,two kinds of structure under the lateral bending moment,deflection change curve under relatively similar,and double cable structure under extreme value is bigger,stiffening girders in the bridge tower and across the maximum transverse bending moment,across the side span deflection in obtain the minimum value,maximum lateral deflection,and mainspan section deflection is greater than the side span section deflection value; The span of the span of the double cable structure has a decrease in the frequency,the frequency of the transverse bending and the torsion frequency. The first order vertical bending frequency has increased. The results of the two models show that the double-cable structure has better stress characteristics and safety performance.
this paper,by using the finite element software MIDAS/Civil build large span suspension bridge single line structure and double spring structure system under finite element model,in view of the two kinds of structure models in automobile live load and horizontal wind load,the structure of the natural frequency of vibration characteristic and force characteristic has carried on the simulation analysis. The results show that the vertical deflection curve under the double cable system is in the inner part of the single cable system,and the vertical deflection of the double cable structure is less than the single cable structure. Under horizontal wind load,two kinds of structure under the lateral bending moment,deflection change curve under relatively similar,and double cable structure under extreme value is bigger,stiffening girders in the bridge tower and across the maximum transverse bending moment,across the side span deflection in obtain the minimum value,maximum lateral deflection,and mainspan section deflection is greater than the side span section deflection value; The span of the span of the double cable structure has a decrease in the frequency,the frequency of the transverse bending and the torsion frequency. The first order vertical bending frequency has increased. The results of the two models show that the double-cable structure has better stress characteristics and safety performance.
引文
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[13]鲁乃唯,刘扬,邓扬.随机车流作用下悬索桥钢桥面板疲劳损伤与寿命评估[J].中南大学学报:自然科学版,2015,46(11):4300-4306.
[2]陈长坤,刘广林,张冬.大空间建筑不同区域受火对平面张弦梁结构响应影响分析[J].科技导报,2011,29(12):32-36.
[3]段鸿川,朱凯,张楚涵,等.浅谈悬索桥的稳定性[J].科技传播,2011(14):50.
[4]王晓明,郝宪武,段瑞芳.基于Steffens-Newton法的空间索形悬索桥初始平衡状态分析[J].计算力学学报,2011,28(5):717-722.
[5]贺星新,李爱群,李建慧,等.土-桩-结构相互作用对独塔自锚式悬索桥地震响应的影响[J].东南大学学报:自然科学版,2014,44(1):150-154.
[6]李中平,刘坚,周敏辉.桅杆结构抗震、抗风和裹冰研究现状与展望[J].华南地震,2014,34(S1):37-42.
[7]张珈铭,刘坚,周观根.大跨度空间钢结构抗震及施工模拟分析研究展望[J].华南地震,2014,34(S1):43-48.
[8]崔晓强,郭彦林,叶可明.大跨度钢结构施工过程的结构分析方法研究[J].工程力学,2006(5):83-88.
[9]Su-Tae Kang,Yun Lee,Yon-Dong Park,Jin-Keun Kim.Tensile fracture properties of an Ultra High Performance Fiber Reinforced Concrete(UHPFRC)with steel fiber[J].Composite Structures.2009(1)
[10]许惟国,范文理.泸州长江二桥非对称大跨连续刚构的施工控制[J].中南林学院学报,2006,(6):136-140.
[11]李立峰,邵旭东.计入局部刚度和稳定约束的钢桥面板优化设计[J].湖南大学学报:自然科学版,2009,36(1):14-18.
[12]杨俊,王霜.悬索桥结构受力特性和计算理论综述[J].长江大学学报:自然科学版理工卷,2009,6(1):281-283.
[13]鲁乃唯,刘扬,邓扬.随机车流作用下悬索桥钢桥面板疲劳损伤与寿命评估[J].中南大学学报:自然科学版,2015,46(11):4300-4306.