三主桁三索面斜拉桥索力优化及空间受力性能研究桥梁与隧道工程专业论文.docxVIP

要本文以武汉天兴洲三主桁三索面斜拉桥为工程背景，对其静力特 要 本文以武汉天兴洲三主桁三索面斜拉桥为工程背景，对其静力特 性进行了研究，主要完成工作如下： 1．利用ANSYS软件建立了三主桁三索面斜拉桥空间力学计算模 型，考虑了几何非线性的影响，模拟了钢一砼结合作用及塔梁的连接 方式。 2．基于影响矩阵法，利用lstOpt优化软件，以平面结构的内力 和线形为控制条件，求得满足控制条件的平面纵向优化索力；再利用 空间模型，根据已求得的纵向优化索力，探讨三面索索力、三片主桁 位移及三片主桁内力相互之间的关系。 3．研究了大跨径板桁结合梁斜拉桥在列车活载、温度、制动力 及风力作用下主桁杆件的受力特性，探讨了设计参数对三主桁结构受 力性能的影响，包括横梁刚度、平联刚度及截面K撑等。 4．对三主桁结构体系和两主桁结构体系进行模拟对比，比较两 种体系的刚度，主桁杆件、横梁及横联等的受力特性，并总结了两种 结构体系各自的优缺点。 关键词斜拉桥，三主桁，三索面，索力优化，影响矩阵法，两主桁 AB AB STRACT With the three cable planes··three trusses cable—-stayed bridge of Tianxingzhou in Wuhan as its engineering background，the paper studies the static properties of this bridge．The primary works in this paper are presented as follows： 1．With the geometric nonlinearity considered，the space model of the three cable planes-three trusses cable．stayed bridge iS established in ANSYS to simulate the composition of steel and concrete and the connection way between tower and beam． 2．With the internal force and geometrical linetype of the plane structure as controlling condition，longitudinal optimum cable tension is obtained in l stOpt based on the influence matrix method．According to the longitudinal optimum cable tension，the relationship among cable tension，displacement and internal force of main truss is studied based on the space model in this paper． 3．The mechanical characteristics of main member under live 10ad， temperature，braking force and wind in large span cable-stayed bridge with plate-truss composite beam is studied，influence of design parameters upon the mechanical characteristics of main member,such as transverse beam rigidity,longitudinal bracing rods and‘‘跫’staying，is also researched． 4．Simulation contrast’analysis is done to three trusses and double trusses structure system．The system rigidity,mechanical characteristics of main member,transverse beam and lateral combination is compared．The advantages and disadvantages of the two kinds of structure system are summarized． KEY WORDS cable—stayed bridge，three tr