公路桥梁落梁防止装置的研究

【作者】 汪芳芳；

【导师】 刘健新；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2003， 硕士

【摘要】 落梁防止系统是梁式桥减震构件的重要组成部分之一。本论文在分析近20年来桥梁震害及其原因和介绍国内外防止落梁技术的发展和现状的基础上，开发了有效的落梁防止装置。本论文采用三水准设防、两阶段设计方法、弹性反应谱计算理论，运用桥梁结构非线性地震响应分析程序NBA(The Program of Nonlinear—Aseismic Analysis for Beam Bridge)进行计算；通过收集大量的实桥设计资料，经分析计算，归纳总结出计算上下部结构相对位移的简便计算方法；并综合国内外的经验值，提出梁的支承长度SE的设计原则；同时运用动力学突加荷载的原理，推导分析了预应力钢绞线式(钢棒连接式)落梁防止装置设计承载力的计算方法和设计伸长量S_F的取值；最后本文通过实桥计算，说明了落梁防止系统设计的方法。希望本论文的研究成果将对落梁防止系统的设计、应用和生产具有一定的现实参考价值，以加速落梁防止装置的实用化进程。更多还原

【Abstract】 Falling-off prevention system of highway bridges is an important type of seismic isolation device. Based on the analysis of the highway bridges’ damages in the earthquakes of recently twenty years and the introduction of the development and the present technology of the world, the paper has explored a useful falling-off prevention device. In this paper, the three level fortification criterion , two stage design method and the elastic response spectrum theory are adopted, and the program of NBA (The Program of Nonlinear-Aseismic Analysis for Beam Bridge) is used to calculate. Through gathering , analyzing and calculating a lot of bridge design materials, this paper induces a simple way to calculate the relative displacement of the beam and the pier, and then according to the current design method, it concludes a better design principle of the supporting length of the beams. At the same time the dynamics is adopted to put forward the design method of the carrying capacity and the lengthen of prestress wire(steel bar) falling-off prevention structures of highway bridges. At last, this paper explains the design method of this device. It is anticipated that this paper would have some referential value to the design, application and production of falling-off prevention device, in order to accelerate its process of the practicality.更多还原