负弯矩作用下钢-混凝土组合梁转动能力计算

Rotation CapacityCalculation for Steel-Concrete Composite Beams under Negative Bending Moment

首先建立了非线性有限元数值模型,得到了作者前期有关组合梁试验数据的验证.然后,应用该可靠的有限元模型,进行了大量算例的参数效应分析,研究了端部弯矩比、力比、腹板高厚比、翼缘宽厚比、受压翼缘侧向长细比、残余应力分布方式、混凝土与钢梁之间的连接程度等7种参数对组合梁转动能力的影响规律.分析表明:除了连接程度对转动能力的影响较小外,其他参数都具有重要的影响.最终,提出了考虑上述影响参数的组合梁转动能力计算公式,供工程设计应用.

A nonlinear finite analysis is developed firstly in element model for numerical this paper, which is validated by the data from the authors＇ previous experiments. Using this reliable model, then a large amount of case study is carried out to investigate the effects of seven parameters on the rotation capacity, such as end-moment ratio, force ratio, web height-thickness ratio, flange width-thickness ratio, slenderness ratio of compressive flange, residual stress distribution pattern and degree of connection between concrete and steel. It is found that except the degree of connection, the other parameters have significant influence. Finally, a formula for rotation capacity of the composite beams considering the above influencing parameters is proposed for engineering design.