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（江蘇大學(xué)土木工程與力學(xué)學(xué)院, 鎮(zhèn)江 212013）

［摘要］為探討高強(qiáng)新型外包鋼-混凝土組合梁的延性性能，對(duì)5根高強(qiáng)新型外包鋼-混凝土組合梁進(jìn)行抗彎試驗(yàn)。根據(jù)試驗(yàn)結(jié)果對(duì)組合梁的位移延性比、曲率延性比與耗能進(jìn)行分析，并通過(guò)彎矩曲率法對(duì)其進(jìn)行全過(guò)程模擬，從曲率延性比的角度對(duì)混凝土強(qiáng)度、外包鋼板屈服強(qiáng)度的影響規(guī)律進(jìn)行定量模擬分析，為工程設(shè)計(jì)提供技術(shù)參考和理論指導(dǎo)。研究表明：彎矩曲率法可有效避免傳統(tǒng)有限元模擬中存在的不收斂、計(jì)算效率較低等問(wèn)題，且模擬結(jié)果與試驗(yàn)結(jié)果吻合良好，可用于高強(qiáng)新型外包鋼\|混凝土組合梁受力與延性性能的模擬研究；提高混凝土強(qiáng)度以及降低外包鋼強(qiáng)度都有利于高強(qiáng)新型外包鋼\|混凝土組合梁延性的提高，且這種影響會(huì)隨著混凝土強(qiáng)度以及鋼板強(qiáng)度的提高而減小。

［關(guān)鍵詞］高z新型外包鋼-混凝土組合梁； 彎矩曲率法； 曲率延性比； 位移延性比； 耗能； 相對(duì)受壓區(qū)高度

中圖分類號(hào)：TU398文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)01-0094-06

Study on ductility of high-strength steel-encased composite beam

Li Yejun， Shi Qiyin， Ren Guanyu， Zhang Zhaochang， Li Yanrong， Lu Fan

(Faculty of Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China)

Abstract:In order to investigate the ductility of high-strength steel-encased composite beam， the bending test on five high-strength steel-encased composite beams was conducted. According to the result of the test, the deflection ductility ratio, curvature ductility ratio and energy dissipation capacity were analyzed. The effect of concrete strength and steel yield strength on the curvature ductility ratio was analyzed quantitatively by the analysis of the moment-curvature method， which provide technical reference and theoretical guidance for the practical engineering. The study results show that the non-convergence and low calculation efficiency could be effectively avoided by the moment-curvature method instead of the finite element simulation. The moment-curvature method is proved to be the effective way to simulate the load behavior and ductility for its results agree well with the experimental data. The increase of concrete strength and the decrease of steel yield strength will lead to the improvement of the ductility and this effect would decrease with the increase of the concrete strength and steel yield strength.

Keywords:highstrength steelencased composite beam; momentcurvature method; curvature ductility ratio; deflection ductility ratio; energy dissipation capacity; relative depth of compressive zone

作者簡(jiǎn)介：李業(yè)駿，碩士研究生，Email：1017097648@qq.com。