三维埋置框架结构瞬态响应的回传射线矩阵法分析

项目名称： 三维埋置框架结构瞬态响应的回传射线矩阵法分析

项目编号： No.51268031

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 余云燕

作者单位： 兰州交通大学

项目金额： 50万元

中文摘要： 工程实践中存在的大型桥梁、桥墩基础、离岸结构等三维埋置框架结构，在施工和运营期间会受到船、冰、水面漂浮物等撞击，很可能导致结构出现裂缝、断裂面或破坏。对结构运营期间的缺陷检测也只能借助结构中波传播的手段进行。开展三维埋置框架结构中瞬态波动响应的研究对保证结构安全、评估结构耐久性具有重要作用。本项目首先开展桩顶作用水平和斜向激振下部分埋入单桩基础的瞬态波动响应研究，分析土体特性、埋桩深度比对弹性波传播规律的影响，揭示缺陷识别特点；其次，考虑土体对能量的耗散和频散作用和材料阻尼，继续完善平面埋置框架的回传射线矩阵法，并将其发展到三维埋置框架结构中，提出三维埋置框架结构的回传射线矩阵法，得到三维埋置框架结构的瞬态波动响应，揭示弹性波在三维埋置框架结构中的传播规律。本项目结果为三维埋置框架结构的合理设计和缺陷检测提供理论指导，也将丰富结构-岩土耦合动力学内容。

中文关键词： 三维埋置框架结构；瞬态响应；回传射线矩阵法；；

英文摘要： 3-D frame structure embedded partially in soil, which used extensively in large-span bridge, pier foundation, and off-shore structure, may subject to impaction due to ship, ice and floating matter, which lead to crack, fracture, and even failure , during construction and working stage. Besides, the damage detection during working stage to the 3-D frame structure embedded partially in soil can only be conducted by wave propagation technique. Consequently, study on the transient wave propagation in the 3-D frame structure embedded partially in soil is essential to guarantee its safety and assess its durability. This project will first investigate the transient wave propagation in pile foundation embedded partially in soil under the horizontal and oblique excitation. The effects of soil properties and embedded depth on the wave propagation and the characteristics of damage detection are also studied. Then, with considering energy dissipation and dispersion of the soil, and material damping, the method of reverberation-ray matrix for planar frame structure embedded partially in soil is developed and extended to 3-D frame structure embedded partially in soil. The method of reverberation-ray matrix for 3-D frame structure embedded partially in soil is presented, and the transient propagation of 3-D frame structure par

英文关键词： 3D embedded frame structure；transient response；the reverberation-ray matrix method；；