Journals / Politeknik Dergisi / 2023 / Cilt: 26 - Sayı: 1

Shape and Size Optimization of Planar Truss Bridges by Gradient Descent Method

Düzlemsel Kafes Tipi Köprülerin Gradyan Düşüş Yöntemiyle Şekil ve Boyut Optimizasyonu

Pages
293–301
Publication Date
2023-03-27
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Some important results of this study are that with an increase in the number of gaps, the final optimum structure becomes slightly heavier, the shape of the optimum structure shows a curve close to a parabola, and the optimum structure becomes more rigid in the vertical direction when dynamic constraints are included in the process.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, the lightest possible design of the Warren truss bridge is aimed for a fixed span distance.
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Key Findings & Data:Optimum structure has been achieved by the Gradient-Descent method.
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Conclusion & Impact:Some important results of this study are that with an increase in the number of gaps, the final optimum structure becomes slightly heavier, the shape of the optimum structure shows a curve close to a parabola, and the optimum structure becomes more rigid in the vertical direction when dynamic constraints are included in the process.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:kafes köprü · optimizasyon · gradyan düşüş yöntemi

Abstract

In this study, the lightest possible design of the Warren truss bridge is aimed for a fixed span distance. Optimum structure has been achieved by the Gradient-Descent method. The total weight of the bar elements that make up the whole structure is used as the objective function. The size of the bars in the span and the heights of the vertical bars are assigned as design variables. The minimum natural vibration frequencies of the rods as compressive and tensile strength, buckling resistance and dynamic restraint are limited or defined within certain ranges. The constraints are included as logarithmic barrier functions. Some important results of this study are that with an increase in the number of gaps, the final optimum structure becomes slightly heavier, the shape of the optimum structure shows a curve close to a parabola, and the optimum structure becomes more rigid in the vertical direction when dynamic constraints are included in the process.

Özet

Bu çalışmada, sabit bir açıklık mesafesi için, Warren kafes tipi köprünün olası en hafif tasarımı hedeflenmektedir. Optimum yapıya Gradyan-Düşüş yöntemiyle ulaşılmıştır. Tüm yapıyı oluşturan çubuk elemanların toplam ağırlığı amaç fonksiyonu olarak kullanılmıştır. Açıklıktaki çubukların boyutu ve dikey çubukların yükseklikleri tasarım değişkenleri olarak atanmaktadır. Çubukların basınç ve çekme mukavemeti, burkulma direnci ve dinamik kısıtlama olarak minimum doğal titreşim frekansları, sınırlandırılmakta veya belirli aralıklar içinde tanımlanmaktadır. Kısıtlamalar logaritmik bariyer fonksiyonu olarak işlemlere dahil edilmektedir. Aralık sayısında artışla, nihai optimum yapının az da olsa ağırlaştığı ve optimum yapının şeklinin parabole yakın bir eğriyi gösterdiği ve dinamik kısıtlamalar işleme dahil edildiğinde optimum yapının dikey yönde daha rijit hale geldiği bu çalışmanın bazı önemli sonuçlarıdır.

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Cite This Article

TAŞKESİĞİ, S. Ş., GÜRAY, E. (2023). Shape and Size Optimization of Planar Truss Bridges by Gradient Descent Method. Politeknik Dergisi, Cilt: 26 - Sayı: 1, 293–301. https://ajindex.com/articles/888296

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