林   冰^1,2，  郭彦林¹
（1 清华大学土木工程系，北京100084;  2 中国建筑工程总公司技术中心，北京101300）

[摘要]  采用大挠度弹塑性有限单元法对均匀受压等截面三铰圆弧钢拱的平面内稳定性和极限强度进行研究，考虑了材料非线性、残余应力、初始几何缺陷和矢跨比的影响，得到了均匀受压工字型等截面三铰圆弧钢拱的平面内稳定性设计曲线，并与国内外钢结构设计规范轴心受压构件的稳定曲线进行了对比，得出了轴心受压构件的稳定曲线不能直接用于拱的稳定性设计的重要结论。
[关键词]  平面内稳定；三铰圆弧钢拱；均匀受压；极限强度；稳定没计曲线

In-plane inelastic stability and ultimate strength of uniform I-section three-hinged circular steel arch in uniform compression
Lin Bing^l,2 ,   Guo Yanlin¹
(1  Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2 Technical Center of China State Construction Engnering Coporation, Beijing 101300, China)

Abstract: In-plane ulimate strength of three-hinged circular steel arch in uniform compression by using large deformation inelastic finite element method is investigated. Matexial inelasticity, residual stress, initial geometry crookedness, and rise-to-span ratio are considered in the research. Stability design curve of welding I- section three-hinged circular steel arch is obtained from numerical results and the results are compared with the stability curves recommended in main steel structures design specifications of other countries. An important conclusion is drawn that the straight column design curves can not be used directly to design pure compression arches.
Keywords: in-plane stability; thre- hinged circular steel arch; uniform compression; ultimate strength; stability design curve