| 确定大跨连续刚构桥地震动输入时程方法比较 |
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| 引用本文： | 罗超,楼梦麟,桂国庆.确定大跨连续刚构桥地震动输入时程方法比较[J].岩土力学,2014,35(Z1):414-422. |
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| 作者姓名： | 罗超 楼梦麟 桂国庆 |
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| 作者单位： | 1. 同济大学 土木工程防灾国家重点实验室，上海 200092；2. 井冈山大学 建筑工程学院，江西 吉安 343009 |
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| 基金项目： | 国家自然科学基金资助(No.90915011)。 |
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| 摘 要： | 以上海某大跨度连续钢构桥梁的场地为例,讨论动水压力对河谷场地土层地震响应的影响,通过对建筑结构抗震规范反应谱生成时程,采用一维、二维模型分别计算得到场地地震动输入时程。对比可以看出,考虑动水压力将会大大减小场地的竖向地震动反应,而动水压力对水平向的地震响应影响不大;反应谱生成时程的方法与一维模型计算得到的时程均与采用考虑场地地形变化的二维模型的计算结果有较大的区别;二维模型计算得到的时程反应谱的卓越周期超出规范反应谱的平台段。最后,讨论了河谷场地对周围场地的影响范围,结果表明河水及河谷对周围场地水平方向的影响范围是沿河谷外侧5倍土层深度或140倍河谷深度,在该范围内的建筑物均应考虑河谷的影响。
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| 关 键 词： | 地面运动 地震反应 河谷地形 动水压力 |
| 收稿时间： | 2013-05-22 |
Comparing time history methods of input ground motion for large span continuous rigid frame bridge |
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| LUO Chao
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LOU Meng-lin
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GUI Guo-qing.Comparing time history methods of input ground motion for large span continuous rigid frame bridge[J].Rock and Soil Mechanics,2014,35(Z1):414-422. |
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| Authors: | LUO Chao LOU Meng-lin GUI Guo-qing |
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| Institution: | 1. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, China； 2. School of Architecture and Civil Engineering, Jinggangshan University, Ji’an, Jiangxi 343009, China |
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| Abstract: | Based on a site of a large span continuous rigid frame bridge in Shanghai, the influence of hydrodynamic pressures on ground motion is discussed. The input ground motion has been obtained by using the response spectrum of code, one-dimension model and two-dimension model. It shows that hydrodynamic pressures can reduced the vertical acceleration response significantly, while it has little effect on horizontal acceleration response. The ground motion calculated by two-dimension model which consider the topography is quite different from that of other two models. The predominant periods of input ground motion calculated by two-dimension model exceeds the flat section of response spectrum of code. Finally, the influence range of valley topography is discussed, which shows that the influence region in the direction normal to the river is no more than 5 times of soil layer thickness or 140 times of deepness of the river valley. Any structures in this region should take river valley influence into consideration. |
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| Keywords: | ground motion seismic response valley topography hydrodynamic pressures |
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