连续组合梁弯矩重分布特征及其随荷载的变化规律

来源期刊:中南大学学报(自然科学版)2011年第2期

论文作者:张彦玲 李运生 樊健生

文章页码:449 - 455

关键词:组合梁;弯矩重分布;全过程受力分析;滑移;共轭梁法

Key words:composite beam; bending moment redistribution; whole process of mechanical analysis; slip; principle of conjugate beam method

摘    要:为了对钢-混凝土连续组合梁进行受弯全过程描述,对3根两跨连续组合梁进行了静力加载试验,研究支座负弯矩区混凝土开裂后组合梁的内力重分布现象,结合试验现象分别确定连续组合梁正负弯矩区弯矩重分布系数随荷载的变化规律,并给出建议计算公式;在此基础上,考虑钢梁与混凝土板之间的相对滑移,采用共轭梁法得到连续组合梁的荷载-挠度和荷载-转角曲线。研究结果表明,连续组合梁弯矩调幅系数随荷载的增加而增加,且在正负弯矩区表现出相同的规律,可以采用弯矩重分布系数的建议计算公式来反映连续组合梁弹性弯矩和混凝土开裂后实际弯矩之间的重分布关系。

Abstract: In order to describe the whole bending process of continuous steel-concrete composite beams, static model tests were conducted on three continuous two-span composite beams, the behavior of bending moment redistribution after concrete cracking at middle support were studied, the changing law of bending moment redistribution coefficient with load in continuous composite beams was determined based on the model tests, and the calculation formula was suggested. Using this formula, and considering the slip between steel girder and concrete slab, the load-deformation and load-rotation angle curves were plotted by principle of conjugate beam method. The results indicate that the bending moment redistribution coefficient of continuous composite beam increases with the increase of the load, and the redistribution law is the same at both positive and negative moment zone. The redistribution relationship between the elastic moment and actual moment after concrete cracking can be described by the suggested formula of bending moment redistribution coefficient.

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