| 基于Ferry Borges理论的地震与重卡车作用下桥梁内力的组合问题 |
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| 引用本文： | 孙得璋,孙柏涛,George C. Lee.基于Ferry Borges理论的地震与重卡车作用下桥梁内力的组合问题[J].地震工程与工程振动,2011,31(6):18-23. |
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| 作者姓名： | 孙得璋 孙柏涛 George C. Lee |
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| 作者单位： | 1. 中国地震局工程力学研究所,黑龙江哈尔滨,150080
2. 纽约州立大学布法罗分校,纽约14260 |
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| 基金项目： | 国际科技合作项目，基本科研业务专项经费项目，国家科技支撑项目 |
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| 摘 要： | 目前的AASHTO LRFD桥梁规范主要考虑重力荷载和卡车等活荷载的组合情况,而没有在概率基础上考虑地震等极端荷载的组合问题.包括LRFD在内的很多桥梁抗震规范都是主要考虑地震的作用,甚至设计时不考虑其他荷载的作用,LRFD设计指导手册中在考虑地震等极端荷载时,也只是提到在特殊情况和桥梁比较长的情况下再考虑卡车的作用,...
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| 关 键 词： | LRFD 极端荷载 随机过程 荷载组合 地震与重卡车 Ferry Borges 桥梁设计 |
Study on combination of internal forces on bridges subjected to earthquake and heavy trucks based on Ferry Borges theory |
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| SUN Dezhang,SUN Baitao,George C. Lee.Study on combination of internal forces on bridges subjected to earthquake and heavy trucks based on Ferry Borges theory[J].Earthquake Engineering and Engineering Vibration,2011,31(6):18-23. |
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| Authors: | SUN Dezhang SUN Baitao George C Lee |
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| Institution: | SUN Dezhang1,SUN Baitao1,George C.Lee2(1.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;2.University at Buffalo,The State University of New York,NY 14260,USA) |
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| Abstract: | The current AASHTO LRFD Bridge Design Specifications are mainly calibrated against gravity load and live load.However,they do not cover extreme load effects in a consistent probability-based fashion.Many seismic design specifications including LRFD mainly focus on seismic load,even not consider any other loads.And the time and method for identifying the factors of truck load in LRFD guide specification are not detailed.In this paper,earthquake load and truck load are time variable processes with their load characteristics.Based on some extreme loads data from USGS,it is very necessary to combine earthquake load and heavy truck load in seismic bridge design.Some methods for loads combination are compared and the Ferry Borges-Castanheta model is proposed,which considers loads lasting duration and happening probability and well describes how the random process converts to random variable and how it combines with other random variables.Finally,a simple example of bridge in Seattle is given for heavy truck load and earthquake load combination. |
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| Keywords: | LRFD extreme load random process load combinations earthquake and heavy truck load Ferry Borges bridge design |
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