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Nonlinear Dynamic Response and Seismic Performance of Steel Towers of Cable-Stayed Bridges under Great Earthquake Ground Motion

大地震地震动作用下斜拉桥钢塔非线性动力响应及抗震性能

基本信息

批准号：
14550473
负责人：
HAYASHIKAWA Toshiro
金额：
$ 2.18万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

A finite element procedure based on total Lagrangian formulation for the nonlinear dynamic analysis of steel tower cable-stayed bridge under three dimensional great earthquake ground motion is carried out. From the peiformed investigations and discussions, the following conclusions can be summarized.(1)The effectiveness of the horizontal beam position on tower axial force dynamic response is assured. The change of horizontal beam height from that of the original tower toward tower top reduces the compressive and tensile axial forces at tower base.(2)The inverted V-type has the largest axial force response, where the maximum compressive and tension axial forces are about 4.70 and 2.55 times of the gravity loads, respectively. The large negative reaction makes the problem that the anchor bolts may fail in the lift up and the safety of the tower should be considered.(3)The proposed energy dissipation system demonstrates its capability and effectiveness in reducing structural dements force … More s and controlling tower maximum displacement through its capability achieving the concentration of inelastic behavior at tower horizontal beam and keeping the rest of the structure elastic behavior as yield level decreases. The post-yield buckling capacity should be considered in the design of tower structures.(4)The effect of vertical ground motion has highly dependence on damping scheme. The Rayleigh's damping is more effective in high frequency range, which leads to slightly effects of the vertical ground motion on tower dynamic response. The Royleigh's damping could be recommended for conservative nonlinear seismic response of high-rise towers.(6)The low yield steel material could add damping primarily by material hysteresis and increase tower flexibility as the horizontal beam early attains, in terms tower structural system ability to reflect a portion of earthquake input energy increase. The energy dissipation system become effective in energy absorption through the horizontal beam.(7)The massive rigid foundation actives the high frequency translation motion of the input ground motion and generates foundation-rocking responses. The predominant contribution to the vertical response at footing base corner from the massive foundation rocking rather than from the vertical excitation. The permanent settlement is found to be less significant. Less

采用全拉格朗日列式有限元法对钢塔斜拉桥进行了三维大震作用下的非线性动力分析。通过调查和讨论，可以得出以下结论。（1）保证了水平梁位置对塔轴力动力响应的有效性。水平梁高度由原塔向塔顶方向改变，减小了塔底的轴压和轴拉。（2）倒V型的轴力响应最大，最大轴压和轴拉力分别约为重力荷载的4.70和2.55倍。塔身负反力过大，导致塔身锚栓在吊装过程中可能发生失效，塔身安全问题亟待解决。（3）消能减震体系具有良好的减震效果 ...更多信息通过控制塔的最大位移，使结构的非弹性性能集中在塔的水平梁上，而结构的其余部分在屈服水平降低时保持弹性性能。在塔架结构的设计中应考虑屈服后屈曲承载力。（4）竖向地震动的影响对阻尼方案有很大的依赖性。瑞利阻尼在高频段的阻尼效果更好，竖向地震动对塔的动力响应影响较小。对于高层塔楼的保守非线性地震反应，建议采用Royleigh阻尼。（6）低屈服钢材料主要通过材料滞回作用增加阻尼，随着水平梁的提前达到，增加塔架的柔度，使塔架结构体系反映一部分地震输入能量的能力增加。消能体系通过水平梁的作用起到消能的作用。（7）大体积刚性基础激发输入地震动的高频平移运动，产生基础摇摆反应。基础转角处竖向反应的主要贡献来自于基础的摇摆，而不是竖向激励。发现永久沉降不太重要。少