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RISS 인기검색어
- 검색키워드
- 저자 : Mehrdad Gordini (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Reliability analysis of double-layer domes with stochastic geometric imperfections
Gordini, Mehrdad,Habibi, Mohammad Reza,Sheidaii, Mohammad Reza,Tahamouliroudsari, Mehrzad Techno-Press 2017 Advances in computational design Vol.2 No.2
This study aimed to investigate the effect of initial member length an imperfection in the load carrying capacity of double-layer domes space structures. First, for the member length imperfection of each member, a random number is generated from a normal distribution. Thereupon, the amount of the imperfection randomly varies from one member to another. Afterwards, based on the Push Down analysis, the collapse behavior and the ultimate capacity of the considered structure is determined using nonlinear analysis performed by the OpenSees software and this procedure is repeated numerous times by Monte Carlo simulation method. Finally, the reliability of structures is determined. The results show that the collapse behavior of double-layer domes space structures is highly sensitive to the random distribution of initial imperfections.
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Random imperfection effect on reliability of space structures with different supports
Mehrzad Tahamouli Roudsari,Mehrdad Gordini 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.55 No.3
The existence of initial imperfections in manufacturing or assembly of double-layer space structures having hundreds or thousands of members is inevitable. Many of the imperfections, such as the initial curvature of the members and residual stresses in members, are all random in nature. In this paper, the probabilistic effect of initial curvature imperfections in the load bearing capacity of double-layer grid space structures with different types of supports have been investigated. First, for the initial curvature imperfection of each member, a random number is generated from a gamma distribution. Then, by employing the same probabilistic model, the imperfections are randomly distributed amongst the members of the structure. Afterwards, the collapse behavior and the ultimate bearing capacity of the structure are determined by using nonlinear push down analysis and this procedure is frequently repeated. Ultimately, based on the maximum values of bearing capacity acquired from the analysis of different samples, structure’s reliability is obtained by using Monte Carlo simulation method. The results show the sensitivity of the collapse behavior of double-layer grid space structures to the random distribution of initial imperfections and supports type.
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