• Title, Summary, Keyword: structural efficiency

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Study on Structural Efficiency of Super-Tall Buildings

  • Jianlong, Zhou;Lianjin, Bao;Peng, Qian
    • International Journal of High-Rise Buildings
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    • v.3 no.3
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    • pp.185-190
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    • 2014
  • Based on a 405m high super-tall building, the influence of outriggers, different shapes and layouts of structural plane and elevation on structural efficiency under lateral forces is studied in this paper. A calculation formula concerning the structural efficiency is given. The study shows that structural efficiency can be improved by triangulating the plane shape, using mega columns, the peripherization of the plane layout, tapering the elevation shape and setting bracing structure in the elevation. The arrangement of outriggers between the core tube and flange frame can reduce the shear lag effect in order to improve structural efficiency. The essence of improving structural efficiency of super-tall buildings is to maximize the plane bending stiffness and to make its deformation approach to plane section assumption.

Particle relaxation method for structural parameters identification based on Monte Carlo Filter

  • Sato, Tadanobu;Tanaka, Youhei
    • Smart Structures and Systems
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    • v.11 no.1
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    • pp.53-67
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    • 2013
  • In this paper we apply Monte Carlo Filter to identifying dynamic parameters of structural systems and improve the efficiency of this algorithm. The algorithms using Monte Carlo Filter so far has not been practical to apply to structural identification for large scale structural systems because computation time increases exponentially as the degrees of freedom of the system increase. To overcome this problem, we developed a method being able to reduce number of particles which express possible structural response state vector. In MCF there are two steps which are the prediction and filtering processes. The idea is very simple. The prediction process remains intact but the filtering process is conducted at each node of structural system in the proposed method. We named this algorithm as relaxation Monte Carlo Filter (RMCF) and demonstrate its efficiency to identify large degree of freedom systems. Moreover to increase searching field and speed up convergence time of structural parameters we proposed an algorithm combining the Genetic Algorithm with RMCF and named GARMCF. Using shaking table test data of a model structure we also demonstrate the efficiency of proposed algorithm.

Space Efficiency and Structural Safety of Eryngii Cultivation House (새송이 버섯 재배사의 공간효율 및 구조안전 검토)

  • Kwon, Jin-Keun;Suh, Won-Myung;Yoon, Yong-Cheol
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • pp.351-354
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    • 2003
  • This study was carried out to set up design criteria of Eryngii cultivation houses. Optimization of lay-out efficiency together with analysis of structural safety were two main tools of approaching toward reasonable models to be developed. Some models tentatively assumed according to the result of field survey and analysis were compared in the aspect of structural safety as well as energy efficiency.

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Form Generation of Cable-Stayed Structures considering Structural Art - by using Graphic Statics - (구조미를 고려한 사장케이블 구조의 형태설계 - 정력학적 도해법 이용 -)

  • Kim, Namhee;Hong, Sung-Gul
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.35 no.4
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    • pp.167-174
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    • 2019
  • Cable-stayed structures provide a lot of possibilities toward the development of innovative structural forms regarding their expressiveness and uniqueness. Such cable-stayed structures, as form-active structures, can obtain a family of alternatives by changing parameters for defining geometric shapes. The concept of graphic statics is utilized to explain the relationship between the load path and structural forms because the load path of cable structures has something to do with their structural geometry. Moreover, this structural geometry has a dominant effect on both structural efficiency and structural elegancy. The proposed design method in this study will help designers conceive innovative structural forms considering structural safety, material efficiency, and structural art altogether.

Consideration of the Lifting Lug Structure using the Hybrid Structural Design System (하이브리드 구조설계 시스템을 이용한 선박블록 탑재용 러그구조 고찰)

  • Ham, Juh-Hyeok;Kim, Dong-Jin
    • Journal of Ocean Engineering and Technology
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    • v.23 no.2
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    • pp.104-109
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    • 2009
  • In the view of the importance of material reduction due to the jump in oil and steel prices, an optimized structural system for lifting lugs was developed. Such a system is needed hundreds of thousands of times a year. A direct design process was added to this developed optimized system to increase the design efficiency and provide a way of directly inserting a designer's decisions into the design system process. In order to verify the system efficiency and convenience, several new prototype lug shapes were suggested using the developed system. From these research results, it was found that the slope of the main plate of the lug structure has a tendency to move from about 45 degrees to about 60 degrees and the design weight was reduced from an initial value of about 32kgf to about $15{\sim}19kg_f$ after the redesign. Based on these initial research results, an efficient reduction in steel weight was expected considering the enormous consumption of lug structures per year. Additionally, a more detail structural analysis through local strength evaluations will be performed to verify the efficiency of the optimum structural design for a lug structure.

Reinforcing Method for Steel Pile Head connection in RC footing (분할된 원호판을 이용한 강관두부보강법에 관한 연구)

  • Noh, Sam-Young;Kim, Kwang-Mo;Han, Seok-Hee;Min, In-Gi
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.476-485
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    • 2006
  • The connection system of steel pile and RC footing is an important structure, because the total load of upper construction should be transferred through this joint construction of different two materials-steel and RC-with strongly changed section area. Although many connection systems have been developed, their structural and economical efficiency and workability are often insufficient. Therefore, a new connecting system was developed to improve the problems of current systems. The divided arc plate could improve the workability and economical efficiency, structural efficiency could be reached by welding construction. The main purpose of the research is to evaluate the structural behavior of the new designed connection system through experiments and numerical analysis.

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Development and comparative study of high-performance direct solvers for computational structural mechanics (전산구조해석을 위한 고성능 직접적 연립방정식 해법의 개발 및 비교 연구)

  • 우성운;김정호
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.387-394
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    • 2004
  • In the structural analysis procedure using finite element technique, the performance of a linear equation solver is critical because the linear equation solving part spends most of the computing time for finite element analysis codes. However, most of researchers are still using inefficient profile-based direct solvers such as the band solver or the skyline solver. In this research, we introduce the multifrontal solution method as an efficient direct solution method for structural analysis, and show the efficiency and performance of the multifrontal solution method by comparing the performance of our own implementation of the multifrontal method with the band solver or the skyline solver. In addition, we also compare the performance of our solver with other implementations of the multifrontal method such as WSMP and MUMPS as well as commercial structural analysis packages such as ABAQUS and NASTRAN. Through the performance test results, the usefulness and efficiency of our domain-wise multifrontal solver for structural analysis is shown.

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A response surface method based on sub-region of interest for structural reliability analysis

  • Zhao, Weitao;Shi, Xueyan;Tang, Kai
    • Structural Engineering and Mechanics
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    • v.57 no.4
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    • pp.587-602
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    • 2016
  • In structural reliability analysis, the response surface method is widely adopted because of its numerical efficiency. It should be understood that the response function must approximate the actual limit state function accurately in the main region influencing failure probability where it is evaluated. However, the size of main region influencing failure probability was not defined clearly in current response surface methods. In this study, the concept of sub-region of interest is constructed, and an improved response surface method is proposed based on the sub-region of interest. The sub-region of interest can clearly define the size of main region influencing failure probability, so that the accuracy of the evaluation of failure probability is increased. Some examples are introduced to demonstrate the efficiency and the accuracy of the proposed method for both numerical and implicit limit state functions.

A comparative analysis of structural damage detection techniques by wavelet, kurtosis and pseudofractal methods

  • Pakrashi, Vikram;O'Connor, Alan;Basu, Biswajit
    • Structural Engineering and Mechanics
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    • v.32 no.4
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    • pp.489-500
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    • 2009
  • The aim of this paper is to compare wavelet, kurtosis and pseudofractal based techniques for structural health monitoring in the presence of measurement noise. A detailed comparison and assessment of these techniques have been carried out in this paper through numerical experiments for the calibration of damage extent of a simply supported beam with an open crack serving as an illustrative example. The numerical experiments are deemed critical due to limited amount of experimental data available in the field of singularity based detection of damage. A continuous detectibility map has been proposed for comparing various techniques qualitatively. Efficiency surfaces have been constructed for wavelet, kurtosis and pseudofractal based calibration of damage extent as a function of damage location and measurement noise level. Levels of noise have been identified for each technique where a sudden drop of calibration efficiency is observed marking the onset of damage masking regime by measurement noise.