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    聶建國(guó)
    （清華大學(xué)土木系  北京 100084）

[提要]  對(duì)鋼-混凝土組合梁的長(zhǎng)期變形問(wèn)題進(jìn)行了分析和討論，指出我國(guó)現(xiàn)行《鋼結(jié)構(gòu)設(shè)計(jì)規(guī)范》關(guān)于組合梁長(zhǎng)期變形的計(jì)算值偏小，并建立了組合梁的長(zhǎng)期剛度計(jì)算公式，反映了混凝土徐變系數(shù)大小的影響，同時(shí)還考慮了混凝土收縮對(duì)變形的影響。公式意義明確，形式簡(jiǎn)單，應(yīng)用方便。
[關(guān)鍵詞I  鋼-混凝土 組合梁  長(zhǎng)期變形  徐變  收縮

Based upon the discussion and analysis for long-term deformation of composite beams of steel and concrete, it is found that the long-term deformation is under- evaluated by the current code "Design of
Steel Structures" used in China. The formulae of long - term rigidity is derived for composite beams under sustained load, in which the effect of creep and shrinkage of concrete is taken into account, The formulae in the paper, with clear physical concept, are simple and easy to be used in practice.
Keywords: composite  beam; long - term  rigidity; shrinkage; creep; concrete