Research Initiation: Sensitivity Analysis and Failure Cost Design of Random Structural Systems in Load Space

结构可靠度的评估方法从 系统分析员。 非线性结构分析程序 用于推导极限状态和正常使用极限状态， 装载空间 通过积分计算系统失效概率 破坏区域内施加载荷的联合密度函数 在三维载荷空间中。 减少负载空间 通过正完成时的假设， 在某些楼层荷载之间的相关性。 结构可变性是 通过随机化 在负载空间中的极限状态函数，而无需任何额外的 结构分析 失效概率对荷载和 阻力变量进行了研究，并与显着因素 捐款已经注意到。 系统的荷载空间设计方法， 基于对故障模式应用权重和最小化 单目标和多目标线性期望总成本 编程，开发。 结果是以下因素之间的权衡曲线： 未来（或失败）成本和初始成本， 结构.

Methods of evaluating structural reliability have advanced from member to system analysis. A nonlinear structural analysis program is utilized to derive ultimate and serviceability limit states in load space. System probability of failure is computed by integration of the joint density function of applied loads in the failure region in a three-dimensional load space. The reduction of load space dimensions to three is possible by assumption of positive perfect correlation amongst certain floor loads. Structural variability is modeled by randomization of the limit state function in load space without requiring any additional structural analysis. Sensitivity of failure probability to load and resistance variables are studied and factors with significant contributions are noted. A systematic load space approach to design, based on applying weights to modes of failure and minimization of the total expected cost using single and multiobjective linear programming, is developed. Results are trade-off curves between future (or failure) cost and initial cost for several realistic structures.