含损伤缺陷的大型钢结构架极限承载预测方法研究

Forecast Method Study on Ultimate Bearing Capacity of Large-Scale Steel Structure Rack with Damage and Defacements

为了能够准确预报出大型钢结构架的极限承载,提高大型承载钢结构架的安全性,提出基于双重非线性理论和测试应力为基准的大型钢结构架极限承载预测方法。推导出以测试应力为参考真实反映钢结构架损伤缺陷的修正模型,实现了对大型钢结构架极限承载的预测。以实验室大型钢结构架模型为例,进行了极限承载实验研究,模型压溃实验所得数据与理论预测值进行了对比,比较结果十分接近,验证了该方法的正确性。

In order to improve the security and correctly forecast the ultimate bearing capacity of large-scale steel structure rack, a new method is proposed. The method based on double nonlinearity theory and took measuring stresses as reference for damage and defacements. The revisal model is deduced which could reflect the true damage and defacements, consequently the ultimate bearing capacity of the large-scale steel structure rack is realized. Experimental study and ultimate bearing capacity forecast are both accomplished on the lab model. The comparative result is very proximity between the forecast results and the destructive experiment values, which verified the correctness of this method.