【摘要】 根据实际工程中存在的软弱地基不均匀沉降造成的空间复杂杆系结构弹性支座刚度的不确定性问题 ,提出了数学反问题方法 ,建立了反问题分析的数学模型 ,并给出数学反问题的解法 ,绘制了计算框图 ,内力分析采用空间杆系有限元法 ,求解方法为迭代法。方法可对常用的空间结构周边支承形式或多点支承时的地基刚度进行调整以符合工程实际情况。最后给出一个工程实例 ,参照西部地区湿陷性黄土特性 ,结合实际工程分析了各种荷载工况下的参数 ,给出了相应的计算结果更多还原

【Abstract】 According to the uncertain problem of elastic support stiffness for complicated space truss in practical projects,which is led by differential settlement of weak foundation,mathematical anti-problem method is proposed,and mathematic analysis models for anti-problem are established.Solution to mathematical anti-problem is given out,and program-diagram is drawn.Finite element method of space truss is applied to analyze internal force,and iterative method is used to solve anti-problem.This method can be applied to regulate the ground stiffness of space structure with boundary or multi-point support to conform to the practical situation of project.Finally,an engineering case is analyzed,referring to the characteristics of collapsible loess in western region of China and parameters of different load cases.更多还原