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首页> 外文期刊>Bulletin of earthquake engineering >Simplified seismic resistant design of base isolated single pylon cable-stayed bridge
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Simplified seismic resistant design of base isolated single pylon cable-stayed bridge

机译：基础隔离单塔斜拉桥底座的简化抗震设计

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摘要

The seismic vulnerability of single pylon cable-stayed bridges under strong ground motions in the transverse direction is of great concern to earthquake engineering researchers and bridge engineers. Introduction of base isolation to cable-stayed bridges has been proved very effective in reducing seismic forces in the bridges in previous studies. This paper proposes a direct displacement based seismic design (DDBD) procedure for base isolated cable-stayed bridge under transverse seismic excitation. One of the key aspects of the DDBD is the realization of a uniform transverse target displacement of the deck under seismic excitation, which is achieved by appropriate design of the isolator stiffness at the bottom of the pylon and the ends of the deck. The proposed DDBD procedure is applied in this paper to the seismic design of a single pylon cable-stayed bridge isolated by friction pendulum bearings. The effectiveness and the accuracy of the resulting design are checked by nonlinear time history analyses. The numerical results indicate that the proposed DDBD procedure can predict the deck displacement profile and amplitudes, as well as the base shear within a reasonable degree of accuracy. The case study demonstrates that the proposed DDBD procedure is sufficiently accurate and practical for the seismic design of base isolated single pylon cable-stayed bridges.
机译：在横向的强大地面运动下，单塔斜拉桥的地震脆弱性在横向的强烈地面运动中对地震工程研究人员和桥梁工程师来说是非常关注的。基本隔离引入缆绳座椅的介绍已经证明非常有效地减少了先前研究中的桥梁中的地震力。本文提出了一种基于直接位移的基于位移的地震设计（DDBD）在横向震动下的基础隔离斜拉桥。 DDBD的一个关键方面是在地震激发下实现甲板的均匀横向目标位移，这通过适当设计塔架底部的隔离器刚度和甲板的端部来实现。本文拟将拟议的DDBD程序应用于摩擦摆轴承隔离的单个塔架斜拉桥的地震设计。通过非线性时间历史分析检查所得设计的有效性和准确性。数值结果表明，所提出的DDBD程序可以预测甲板位移曲线和幅度，以及在合理的精度范围内的基础剪切。案例研究表明，拟议的DDBD程序对于底座隔离的单塔斜拉桥的地震设计是足够的准确和实用性。

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