دانلود رایگان مقاله روش های طراحی بهینه برای بنیاد ستون در لندن

Abstract

Given the importance of pile foundations in geotechnical engineering for supporting high-significance structures such as bridges, high-rise buildings, power plant stations, offshore platforms and museums, it becomes a necessity to find the best pile foundation design in terms of performance and economy. The number of piles required might exceed several hundreds or even thousands while the pile foundation cost might exceed 20% of the construction cost of the superstructure. In this work the problem of finding optimized designs of pile foundations is examined and is performed in accordance to two design code recommendations, namely Eurocode 7 and DIN 4014. The proposed structural optimization procedure is implemented in two real-world cases both located in London, UK in order to assess the efficiency of the proposed design formulation.

Conclusions

The main objective of our study is to present the advantages of using search algorithms into real world problems. In particular, two real world test cases found in the literature were used in order to implement a design framework formulated as an optimization problem for the design of pile foundations. In order to present the efficiency of our design framework and prove that it is not dependent on the design code used, Eurocode and DIN regulations are employed. In this work the problem of defining the best pile foundation is formulated as a combined sizing and topology optimization problem with the aim of achieving the most economical design of the pile foundation. The design variables considered are related to both the dimensions and the number of the piles assigned to the foundation. In order to assess the efficiency of the problem formulation and the optimization algorithm adopted to deal with, two real-world problems have been considered as test cases. The main findings of this work can be summarized as follows:  Through the implementation of the proposed formulation in two different soil conditions, it was found that depending on the soil conditions DIN design procedure can become more conservative compared to the EC7 and vice versa.  Furthermore, through the proposed formulation pile foundation designs are achieved which are more economic compared to the foundation solutions implemented in the original design. The benefit in terms of construction cost of the optimum designs varies from 7% to 33% compared to original solutions.