Based on reliability theory,a general method for the optimization design of piles subjected to horizontal loads is presented.This method takes into consideration various uncertainties caused by pile installation,varia...Based on reliability theory,a general method for the optimization design of piles subjected to horizontal loads is presented.This method takes into consideration various uncertainties caused by pile installation,variability of geotechnical materials from one location to another,and so on.It also deals with behavior and side constraints specified by standard specifications for piles.To more accurately solve the optimization design model,the first order reliability method is employed.The results from the numerical example indicate that the target reliability index has significant influence on design parameters.In addition,the optimization weight increases with the target reliability index.Especially when the target reliability index is relatively large,the target reliability index has significant influence on design weight of piles.展开更多
加筋壳结构具有较高的比刚度和比强度,被广泛应用于航空航天承力结构中。可靠性优化设计(Reliability Based Design Optimization,RBDO)方法通过综合考虑结构参数中的不确定性和风险因素,可避免结构的过保守设计,保证其在服役环境中的...加筋壳结构具有较高的比刚度和比强度,被广泛应用于航空航天承力结构中。可靠性优化设计(Reliability Based Design Optimization,RBDO)方法通过综合考虑结构参数中的不确定性和风险因素,可避免结构的过保守设计,保证其在服役环境中的可靠性和安全性。提出了一种基于自适应代理模型的高效RBDO方法,来解决屈曲可靠性约束下的加筋壳结构轻量化设计问题。基于预期可行性函数准则实现了样本点的自适应添加,并通过构建分段函数将离散变量连续化,进而在保证设计结果可靠性的前提下提高优化效率。最后,通过将可靠性优化设计结果与确定性优化结果对比,验证了所提方法的有效性。展开更多
基金Project(51278216) supported by the National Natural Science Foundation of China
文摘Based on reliability theory,a general method for the optimization design of piles subjected to horizontal loads is presented.This method takes into consideration various uncertainties caused by pile installation,variability of geotechnical materials from one location to another,and so on.It also deals with behavior and side constraints specified by standard specifications for piles.To more accurately solve the optimization design model,the first order reliability method is employed.The results from the numerical example indicate that the target reliability index has significant influence on design parameters.In addition,the optimization weight increases with the target reliability index.Especially when the target reliability index is relatively large,the target reliability index has significant influence on design weight of piles.
文摘加筋壳结构具有较高的比刚度和比强度,被广泛应用于航空航天承力结构中。可靠性优化设计(Reliability Based Design Optimization,RBDO)方法通过综合考虑结构参数中的不确定性和风险因素,可避免结构的过保守设计,保证其在服役环境中的可靠性和安全性。提出了一种基于自适应代理模型的高效RBDO方法,来解决屈曲可靠性约束下的加筋壳结构轻量化设计问题。基于预期可行性函数准则实现了样本点的自适应添加,并通过构建分段函数将离散变量连续化,进而在保证设计结果可靠性的前提下提高优化效率。最后,通过将可靠性优化设计结果与确定性优化结果对比,验证了所提方法的有效性。
