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系杆拱连续梁桥-多线轨道互制分析的荷载步法
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作者 谢浩然 《铁道标准设计》 北大核心 2023年第6期31-36,79,共7页
为研究考虑加载历史的桥梁-多线轨道系统受力特性,通过推导考虑加载历史的线路纵向阻力迭代公式并以某(77+3×156.8+77)m系杆拱连续梁桥为例,建立考虑钢管混凝土拱、吊杆、梁体、桥墩、桩基、多线轨道的大跨度系杆拱连续梁桥一体化... 为研究考虑加载历史的桥梁-多线轨道系统受力特性,通过推导考虑加载历史的线路纵向阻力迭代公式并以某(77+3×156.8+77)m系杆拱连续梁桥为例,建立考虑钢管混凝土拱、吊杆、梁体、桥墩、桩基、多线轨道的大跨度系杆拱连续梁桥一体化有限元模型,分析加载历史对系杆拱连续梁桥-轨道系统受力影响及结构检算结果。结果表明:代数求和算法计算钢轨应力峰值偏大61.9%,墩顶水平力偏大74.0%,考虑温度效应须同时对钢轨、梁体和拱施加温度荷载;挠曲工况下双线同向加载时墩顶水平力为1058.2 kN,双线对向加载时墩顶扭矩为4193.6 kN·m;计算温度制挠力时,代数求和算法计算钢轨应力较荷载步法偏大7%,墩顶水平力偏大8%~27%,设计不经济;代数求和算法计算墩顶扭矩与荷载步法最大偏差可达51.3%。 展开更多
关键词 高速铁路 铁路桥梁 系杆拱连续梁桥 互制分析 加载历史 荷载步法
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A Two-step Approach to Progressive Collapse Analysis of Building Structures under Blast Loading 被引量:4
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作者 徐俊祥 刘西拉 《Journal of Shanghai Jiaotong university(Science)》 EI 2009年第4期393-397,共5页
Structural collapse under blast loads is a very complex process. For several decades, the engineering profession has considered some approaches to analyze the essential physics of collapse phenomena. Recently, the int... Structural collapse under blast loads is a very complex process. For several decades, the engineering profession has considered some approaches to analyze the essential physics of collapse phenomena. Recently, the interest in this topic has risen to an apex since the collapse of the World Trade Center towers. A two-step analysis approach to capture the characteristics of structural collapse during explosions is proposed. A numerical example is presented to illustrate the performance of the presented approach. 展开更多
关键词 explosion progressive collapse DAMAGE reinforced concrete structural robustness
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