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arXiv 2104.07148math.OC
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最优拱顶问题--二维凸规划找形

Optimal vault problem -- form finding through 2D convex program

Karol Bołbotowski

摘要:

本文提出了一个最小体积拱顶的找形设计问题,该拱顶是一个跨越平面区域的表面结构,通过纯压缩将垂直跟踪荷载传递到支撑边界。通过对偶计划,最近开发的预应力膜的设计,最优拱顶问题减少到一对相互对偶凸问题$(\mathcal{P})$,$(\mathcal{P}^*)$制定的二维参考区域。证明了基于这些问题的解所构造的拱顶同时具有最小体积和最小柔度,并给出了最优拱顶的分析实例。通过测量理论的方法,从而发现最优拱顶被证明是解决普拉格问题的设计一个三维结构,通过压缩进行传递载荷。应用于凸问题的基结构法求解了一对离散的二次锥规划$(\mathcal{P}_X)$、$(\mathcal{P}_X^*)$,从而得到了网壳的最优设计。通过采用增加成员的自适应技术,这对有效地解决了数值,这是证明了一些例子中,高精度的网格壳近似的最佳拱顶。

英文摘要:

This work puts forward a form finding problem of designing a least-volume vault that is a surface structure spanning over a plane region, which via pure compression transfers a vertically tracking load to the supporting boundary. Through a duality scheme, developed recently for the design of pre-stressed membranes, the optimal vault problem is reduced to a pair of mutually dual convex problems $(\mathcal{P})$, $(\mathcal{P}^*)$ formulated on the 2D reference region. The vault constructed upon solutions of those problems is proved to be both of minimum volume and minimum compliance; analytical examples of optimal vaults are given. Through a measure-theoretic approach, thus found optimal vaults are proved to solve the Prager problem of designing a 3D structure that by compression carries a transmissible load. The ground structure method applied to the convex problems furnishes a pair of discrete, conic quadratic programs $(\mathcal{P}_X)$, $(\mathcal{P}_X^*)$ leading to optimal design of grid-shells. By adopting the member-adding adaptive technique this pair is efficiently tackled numerically, which is demonstrated on a number of examples where highly precise grid-shell approximations of optimal vaults are found.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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