深水中大跨径斜拉桥地震响应分析   总被引：1，自引：0，他引：1  

赵国辉  彭浩 《震灾防御技术》2010,5(4):461-466

本文以某斜拉桥为例,采用基于Morison方程的附加动水质量方法研究了动水压力对深水中大跨径斜拉桥地震响应的影响,并对中国、日本和欧洲规范中动水惯性系数的取值进行了对比研究。结果表明,在深水条件下应当考虑动水压力作用对结构地震响应的影响。对比日本和欧洲规范,我国规范中动水惯性系数取值偏低,动水压力的影响偏小。  相似文献   

某异型钢管混凝土拱桥地震反应分析     

李勇  闫维明  陈彦江 《震灾防御技术》2010,5(3):346-351

本文以某异型钢管混凝土拱桥为研究对象,通过ANSYS建立了结构的空间有限元模型,计算和分析了该桥的动力特性。同时,通过MATLAB程序生成拟合规范反应谱的人工地震波,并运用时程分析法计算了该桥在一维和多维输入下的地震反应,分析了该桥的地震反应规律,为钢管混凝土拱桥的抗震性能分析提供了一定的依据。  相似文献   

Non-linear buffeting response analysis of long-span suspension bridges with central buckle   总被引：1，自引：1，他引：0  

Hao Wang  Aiqun Li  Gengwen Zhao  Jian Li 《地震工程与工程振动(英文版)》2010,9(2):259-270

The rigid central buckle employed in the Runyang Suspension Bridge (RSB) was the first time it was used in a suspension bridge in China. By using a spectral representation method and FFT technique combined with measured data,a 3D fluctuating wind field considering the tower wind effect is simulated. A novel FE model for buffeting analysis is then presented,in which a specific user-defined Matrix27 element in ANSYS is employed to simulate the aeroelastic forces and its stiffness or damping matrices are parameterized by wind velocity and vibration frequency. A nonlinear time history analysis is carried out to study the influence of the rigid central buckle on the wind-induced buffeting response of a long-span suspension bridge. The results can be used as a reference for wind resistance design of long-span suspension bridges with a rigid central buckle in the future.  相似文献   

Response of the Fatih Sultan Mehmet Suspension Bridge under spatially varying multi-point earthquake excitations     

《Soil Dynamics and Earthquake Engineering》2016

The study aims at investigating the structural behavior of the Fatih Sultan Mehmet Suspension Bridge, i.e. the second Bosphorus Bridge in Turkey, under multi-point earthquake excitations, and determining the earthquake performance of the bridge based on the results obtained from this analysis. For this objective, spatially varying ground motions in triple direction were produced for each support of the bridge considering the Mw=7.4 scenario earthquakes on the main Marmara Fault. In order to simulate the ground motions, modified stochastic finite-fault technique was utilized. Taking the ground motions into account, non-linear time-history analysis was carried out, and the results obtained from the analysis were compared to those from uniform support earthquake excitation to identify the effects of multi-point earthquake excitations on the seismic performance of the bridge. From the analysis, it was determined that modal response of the towers and the deck was mostly effective on dynamic response of the entire bridge rather than other structural elements, such as cable and approach viaduct. Compared to the results obtained from simple-point earthquake excitation, noticeable axial force increase in the cable elements was obtained under multi-point earthquake excitation. The changes at the main cable and the side span cable were determined as 21% and 18%, respectively. This much increase in the cable elements led to increase in axial force at the towers and in shear force at the base section of the tower column. These changes in the structural elements were closely related to response of the deck and the towers since they had considerable contribution to response of the entire bridge. Based on the findings from the study, spatially varying ground motions has to be considered for long span suspension bridges, and the multi-support earthquake analysis should be carried out for better understanding and obtaining reliable results necessary for retrofitting and performance evaluation.  相似文献   

强震作用下超高桥墩动力稳定性理论研究   总被引：4，自引：4，他引：0       下载免费PDF全文

程麦理  李青宁  苗如松 《地震工程学报》2016,38(3):360-365

根据平截面假定,考虑超高桥墩大位移变形产生的几何非线性影响,建立超高桥墩的振动控制微分方程,利用变步长的龙格-库塔法进行求解,结合B-R运动判定准则,对超高桥墩在地震作用下的动力失稳机理进行研究。理论分析表明,超高桥墩的动力失稳与桥墩的几何尺寸、质量分布、边界条件有密切关系;桥墩动力失稳时刻随地震波加速度峰值的增大而减小;失稳时刻与失稳加速度荷载有对应关系。算例结果表明:本文方法正确,利用本文理论能够准确计算超高桥墩的失稳时刻及失稳加速度,对超高桥墩动力失稳的理论分析及工程实践有重要指导意义。  相似文献   

粗颗粒间液桥毛细力演化规律的动态计算方法     

张昭  刘奉银  齐吉琳  柴军瑞 《岩土力学》2016,37(8):2263-2270

水力特性是非饱和土力学理论与工程的重要课题之一,土样水力特性的变化过程本质上可反映为土颗粒间毛细力的演化规律。为此,以粗颗粒为研究对象,将其简化为一对不等径球体颗粒,而其间的水分形态可视为形如圆环的液桥,不考虑颗粒重力和浮力的影响。以Young-Laplace方程为基础,先推得计算液桥毛细力的控制方程组,再结合液桥的无量纲体积最大、最小值及其外曲率半径的割线迭代算法提出求解毛细力的动态计算方法,进而研究毛细力与颗粒间距、颗粒半径比和液桥体积的无量纲关系,结果表明：当颗粒间距一定时,液桥的毛细力随其体积和颗粒半径比增大均呈递增趋势;当液桥体积一定时,其抗拉刚度随颗粒间距增大呈递减趋势。最后,利用已有文献中液桥毛细力与颗粒间距的实测关系,验证了该动态计算方法在表征液桥从形成至断裂时毛细力演化规律的有效性。  相似文献   

钢管混凝土拱桥海上应用实例     

石彩亭 《中国勘察设计》2009,(9):38-40

近年来钢管混凝土拱桥建设在全国迅速发展,型式多样、各有千秋。本文就大跨度全钢系杆拱在大连新港50万吨级进口原油码头引桥上的成功应用做以下介绍。  相似文献   

A semi-automatic lightweight ontology bridging for the semantic integration of cross-domain geospatial information     

Jung-Hong Hong 《International journal of geographical information science》2013,27(12):2223-2247

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Variation of modal parameters of a highway bridge extracted from six earthquake records     

Hugo C. Gomez  Hasan S. Ulusoy  Maria Q. Feng 《地震工程与结构动力学》2013,42(4):565-579

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岩溶天生桥纵向分层旅游开发方式——以重庆黔江蒲花天生桥群为例     

韦跃龙  陈伟海 《地球学报》2012,33(1):98-110

本文按发育岩性(可溶岩和非可溶岩), 发育规模(如桥高、拱高、跨度等), 桥下河谷的发育特征(常年性、季节性河流和干谷), 及发育成因(地表和地下), 提出天生桥的4大分类方案, 简要介绍和概括了近年来中国发现的典型岩溶天生桥的类型、分布格局、发育规模及景观组合和对比特征。然后以重庆黔江蒲花天生桥群为例, 初步分析和探讨了它的形成与演化, 系统分析和评价了它的资源系统, 通过与黔江区、武陵山区旅游资源及国内其它相似景区的对比, 概括其资源特色为“一河两桥三窗”, 并结合其市场条件, 将旅游开发主题定格为“桥下游暗河, 桥上走天桥, 上游漂激流”, 提出“一心二带一区三环”的功能布局, 探讨不同功能区的开发思路, 划分出主导、重要和配套3个层次的旅游产品项目, 构建连通桥上桥下的三大游览环线, 设计出“河-人-桥”三位一体的灯光效果。最后, 通过对中国典型岩溶天生桥旅游开发方式的概括、对比和分析, 提出岩溶天生桥纵向分层旅游开发方式, 并概括出3大分层方式: (1)“桥下观光, 桥上保护”式; (2)“桥下桥上观光”式; (3)“桥下保护, 桥上观光”式。  相似文献