【作者】 谢小飞；

【导师】 谢官模；

【作者基本信息】 武汉理工大学 ， 工程力学， 2009， 硕士

【摘要】 自锚式悬索-斜拉协作体系桥作为一种高次超静定结构体系,它不仅具有一般缆索承重桥梁的力学特性,更具有明显的几何非线性特点,同时由于加劲梁存在很大的轴力,存在着梁-柱效应。自锚式悬索-斜拉协作体系桥在各种荷载工况作用下,静、动力特性也比悬索桥和斜拉桥更为复杂,本论文以南平跨江大桥为工程背景,对其成桥状态及施工关键技术进行分析研究。先对南平跨江大桥的成桥状态进行分析研究,以设计图纸为基础,已知主缆线形和吊杆与斜拉索索力标准值的情况下,利用主缆线形计算方法节线法求解各段主缆索力,将所求得的索力赋予有限元模型进行求解分析,验证桥梁结构达到合理目标成桥状态。在得到的目标成桥状态下,取出加劲梁的钢-混结合段及与其相连接的钢箱梁和混凝土箱梁的一部分并结合有限元程序Ansys对其进行分析,研究钢-混结合段的传力与变形的连续性,同时研究剪力钉的受力与传力机理。通过对钢-混结合段不含剪力钉的整体和钢-混结合段含剪力钉的局部比较分析知,剪力连接构件-剪力钉能很好的起到抗滑移和传力作用,同时剪力钉与钢板连接端在设计中需设置加强构件以防止剪力钉被剪断。为使加劲梁能达到成桥状态下的线形,对贝雷支架系统进行分析,研究预拱度产生的因素,在混凝土箱梁和钢箱梁的自重作用下,临时墩有一定的弹性变形,不可忽略不计,最终支架预拱度的设置构成主要有贝雷梁的弹性变形和由临时墩变形给贝雷梁带来的牵连位移。对斜主塔竖转吊装结构进行仿真分析,研究主塔在不同位置时转体结构的最不利状态,发现最不利状态发生在主塔刚被提升时,在转体结构的最不利状态下局部分析转铰与主塔连接区域的应力与变形,可知转铰的耳板与主塔连接处应力水平高,需保证焊缝的强度,主塔上变形极小、应力水平较低,能够满足要求。更多还原

【Abstract】 Self-anchored cable-stayed suspension bridge which is a high order statically indeterminate structure not only has mechanical properties of cable-supported bridge, and has geometric nonlinear features. It has beam-column effect because the stiffening girder exist enormous axial force. The static and dynamic characteristics of self-anchored cable-stayed suspension bridge which in various load cases are complex than suspension bridge or cable-stayed bridge. Its analysis based on Nan ping Kuajiang bridge in this paper.Study on completion state of Nanping Kuajiang bridge based on design drawing, using segment line method to solving cable tension in the condition of known the cable curve and the standard value of hanger tension, then assign to finite element model to analysis. It is find that the bridge reach target completion state through the analysis.Using finite element program Ansys to analysis the steel concrete combination segment in the target completion state, research force received and transfer mechanism. Meanwhile, it is to research anti-sliding and transfer mechanism of the shear studs. It finding that the shear connecting component - shear studs has a anti-sliding effect and must set stiffening member in root of the shear studs to prevent shear break, by the analysis between the whole steel concrete combination segment model and local model.It analyzes bailey supporting system of stiffening girder for the purpose of reaching design alignment and composition of camber. The temporary pier will have elastic deformation under self weight of stiffening girder effects, and the deformation can’t ignore. The finally camber is composed of elastic deformation of stiffening girder and temporary pier.When the main tower is in the different position of the vertical rotation construction process, search the most unfavorable state of structure, and known it happened in the beginning of the process. It analyzes stress and deformation of the local region from the combination of hinge and main tower, and finds the stress level of lug and steel plate’s connected region is very high, and must assure the intensity of welding line. The deformation and stress of main tower are very small, and can meet require.更多还原