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林   冰^1,2，  郭彥林¹
（1 清華大學(xué)土木工程系，北京100084;  2 中國(guó)建筑工程總公司技術(shù)中心，北京101300）

[摘要]  采用大撓度彈塑性有限單元法對(duì)均勻受壓等截面三鉸圓弧鋼拱的平面內(nèi)穩(wěn)定性和極限強(qiáng)度進(jìn)行研究，考慮了材料非線性、殘余應(yīng)力、初始幾何缺陷和矢跨比的影響，得到了均勻受壓工字型等截面三鉸圓弧鋼拱的平面內(nèi)穩(wěn)定性設(shè)計(jì)曲線，并與國(guó)內(nèi)外鋼結(jié)構(gòu)設(shè)計(jì)規(guī)范軸心受壓構(gòu)件的穩(wěn)定曲線進(jìn)行了對(duì)比，得出了軸心受壓構(gòu)件的穩(wěn)定曲線不能直接用于拱的穩(wěn)定性設(shè)計(jì)的重要結(jié)論。
[關(guān)鍵詞]  平面內(nèi)穩(wěn)定；三鉸圓弧鋼拱；均勻受壓；極限強(qiáng)度；穩(wěn)定沒計(jì)曲線

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