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基于体系转换法上承式拱桥结构加固设计研究
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作者 覃霞 马增华 +2 位作者 李祎嘉 傅健 谢肖礼 《国防交通工程与技术》 2025年第2期11-16,共6页
为解决部分上承式拱桥承载能力不足的问题,基于体系转换法提出加肋桁架拱桥加固方法,即拆除原上承式拱桥钢筋混凝土拱上建筑,在拱圈上增设刚性斜杆及钢主梁,形成以三角网腹杆连接主梁及原拱圈的加肋桁架结构,将由原拱圈为主要承重构件... 为解决部分上承式拱桥承载能力不足的问题,基于体系转换法提出加肋桁架拱桥加固方法,即拆除原上承式拱桥钢筋混凝土拱上建筑,在拱圈上增设刚性斜杆及钢主梁,形成以三角网腹杆连接主梁及原拱圈的加肋桁架结构,将由原拱圈为主要承重构件体系转换为加肋桁架及拱圈共同受力体系,提高结构的整体性及承载能力。以一座跨径为46 m的上承式拱桥为例进行加固,通过网格数值模拟分析加固效果。结果表明:加固后拱圈在活载作用下下挠峰值向跨中内移,体系转换作用明显,结构刚度提高16.9%,拱圈最大应力较原桥减小了26.4%,结构固有频率提高37.6%。加固优化后的上承式拱桥能够满足公路-Ⅰ级荷载要求。 展开更多
关键词 上承式拱桥 结构加固 加肋桁架 体系转换法 网格法数值模拟
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Visualization of 3-D Field of Explosion 被引量:1
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作者 孙娟 宁建国 《Journal of Beijing Institute of Technology》 EI CAS 2002年第4期397-400,共4页
In order to visualize the 3-D field of explosion and describe the complex physical phenomena of explosion, the 3-D data resulting from numerical simulation by 3-D multi-material in cell (MMIC), and the application of ... In order to visualize the 3-D field of explosion and describe the complex physical phenomena of explosion, the 3-D data resulting from numerical simulation by 3-D multi-material in cell (MMIC), and the application of volume visualization is explored, based on the characteristics of explosion and shock. Based on this, a visualization system for 3-D explosion--ViSC3D is designed. Approaches for the visualization of 3-D field of explosion are presented. The algorithm and the functions of ViSC3D are also presented. ViSC3D is thus a useful tool to observe and analyze either the full picture or the details of a 3-D field of explosion, that are difficult to observe and analyze directly. With ViSC3D, the field of explosion between the hill slopes is visualized. The cutaway views and 2-D slices are also given. The full picture and partial details of 3-D field of explosion can be observed clearly. Furthermore, ViSC3D can be used to visualize other similar 3-D data fields. 展开更多
关键词 VISUALIZATION 3-D explosion field ViSC3D
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