设计简介
摘 要
本课题对大跨度斜拉立体桁架结构进行静、动力非线性分析，得出各构件对结构整体稳定性的影响。在结构跨度较大的情况下，传统的结构形式越来越难以满足大跨度要求，于是对大跨度结构体系的研究显得尤为必要。由于斜拉结构体系的计算理论大都借鉴斜拉桥结构，悬索结构和塔桅结构等领域的成果，许多方面缺乏系统深入研究，如大跨度结构设计中线性求解结果与非线性求解结果相差多少，非线性到底对哪些构件的影响最大等都是必须解决的问题。大跨度斜拉立体桁架结构跨度大，在外荷载作用下各单元长度、倾角改变大，小变形假定可能已无法度量大变形物体的运动状态。因此，研究大跨度结构设计中是否必须用非线性求解代替线性求解具有重要的理论意义和工程实用价值。
关键词：大跨度斜拉立体桁架；静力；非线性单元；稳定
Abstract
This topic pulls the three-dimensional girder construction to the great span to carry on, the power nonlinear analysis calmly slanting, obtains various components to the structure overall stable influence. In the structure span big situation, the traditional structural style satisfies the great span request more and more with difficulty, therefore appears especially essential to the great span structure system's research. Because pulls the structure system's computation theory to profit from the diagonal cable bridge structure mostly slanting, the wire suspension structure and domain and so on tower mast structure achievements, many aspects lack the system deep research, like in the great span structural design the linear solution result and the misalignment solution result differs how many, which component's influence is the misalignment to biggest and so on question which must solve. The great span pulls the three-dimensional girder construction span to be big slanting, under the outside load function various units length, the inclination angle changes in a big way, slightly distorts the hypothesis possibly to be unable to measure the big distortion object the state of motion. Therefore, studies in the great span structural design whether can use the misalignment solution to replace the linear solution to have the important theory significance and the project use value.
key word: long span cable-stayed space truss; Static; Misalignment unit; Stable
目 录
0绪论 1
0.1斜拉结构的发展、应用和研究意义 1
0.2斜拉结构的研究现状、研究方向 2
1空间杆和空间梁单元分析 3
1.1空间杆和空间梁单元的线性刚度矩阵 3
1.2非线性的分类 4
1.3 几何非线性的一般概念 4
1.4空间杆单元的切线刚度矩阵 6
1.5空间梁单元的切线刚度矩阵 9
1.6本章小结 12
2斜拉索单元分析 12
2.1斜拉索单元分析方法概述 12
2.2斜拉索单元的解析法 12
2.3 斜拉索的二力杆分析法 16
2.4 本章小结 16
3大跨度斜拉立体桁架的结构形式、受力变形特征 16
3.1结构的合理形式 16
3.2大跨度斜拉立体桁架的受力变形特点 18
3.3支座的处理 24
3.4 本章小结 24
4非线性求解及结果对比分析 24
4.1线性结果与非线性结果对比分析 24
4.2本章小结 30
5全文总结 30
5.1 本文研究成果和所得结论 30
5.2 展望 31
鸣谢 31
参考文献 32
本课题对大跨度斜拉立体桁架结构进行静、动力非线性分析，得出各构件对结构整体稳定性的影响。在结构跨度较大的情况下，传统的结构形式越来越难以满足大跨度要求，于是对大跨度结构体系的研究显得尤为必要。由于斜拉结构体系的计算理论大都借鉴斜拉桥结构，悬索结构和塔桅结构等领域的成果，许多方面缺乏系统深入研究，如大跨度结构设计中线性求解结果与非线性求解结果相差多少，非线性到底对哪些构件的影响最大等都是必须解决的问题。大跨度斜拉立体桁架结构跨度大，在外荷载作用下各单元长度、倾角改变大，小变形假定可能已无法度量大变形物体的运动状态。因此，研究大跨度结构设计中是否必须用非线性求解代替线性求解具有重要的理论意义和工程实用价值。
关键词：大跨度斜拉立体桁架；静力；非线性单元；稳定
Abstract
This topic pulls the three-dimensional girder construction to the great span to carry on, the power nonlinear analysis calmly slanting, obtains various components to the structure overall stable influence. In the structure span big situation, the traditional structural style satisfies the great span request more and more with difficulty, therefore appears especially essential to the great span structure system's research. Because pulls the structure system's computation theory to profit from the diagonal cable bridge structure mostly slanting, the wire suspension structure and domain and so on tower mast structure achievements, many aspects lack the system deep research, like in the great span structural design the linear solution result and the misalignment solution result differs how many, which component's influence is the misalignment to biggest and so on question which must solve. The great span pulls the three-dimensional girder construction span to be big slanting, under the outside load function various units length, the inclination angle changes in a big way, slightly distorts the hypothesis possibly to be unable to measure the big distortion object the state of motion. Therefore, studies in the great span structural design whether can use the misalignment solution to replace the linear solution to have the important theory significance and the project use value.
key word: long span cable-stayed space truss; Static; Misalignment unit; Stable
目 录
0绪论 1
0.1斜拉结构的发展、应用和研究意义 1
0.2斜拉结构的研究现状、研究方向 2
1空间杆和空间梁单元分析 3
1.1空间杆和空间梁单元的线性刚度矩阵 3
1.2非线性的分类 4
1.3 几何非线性的一般概念 4
1.4空间杆单元的切线刚度矩阵 6
1.5空间梁单元的切线刚度矩阵 9
1.6本章小结 12
2斜拉索单元分析 12
2.1斜拉索单元分析方法概述 12
2.2斜拉索单元的解析法 12
2.3 斜拉索的二力杆分析法 16
2.4 本章小结 16
3大跨度斜拉立体桁架的结构形式、受力变形特征 16
3.1结构的合理形式 16
3.2大跨度斜拉立体桁架的受力变形特点 18
3.3支座的处理 24
3.4 本章小结 24
4非线性求解及结果对比分析 24
4.1线性结果与非线性结果对比分析 24
4.2本章小结 30
5全文总结 30
5.1 本文研究成果和所得结论 30
5.2 展望 31
鸣谢 31
参考文献 32
