scholarly journals Projeto otimizado de pórticos espaciais de concreto armado / Optimized design of reinforced concrete space frames

2021 ◽  
Vol 7 (11) ◽  
pp. 105438-105448
Author(s):  
Christie de Vilhena Prata Machado ◽  
Franciane Conceição Peters ◽  
Magnus Carvalho de Vilhena Prata ◽  
Webe João Mansur
1989 ◽  
Vol 5 (1) ◽  
pp. 121-143 ◽  
Author(s):  
E. Miranda ◽  
V. V. Bertero

This paper summarizes the results of analytical studies conducted to understand the observed performance of low-rise buildings located in the soft-soil zone of Mexico City during the 1985 Michoacan earthquake. Two low-rise reinforced concrete moment resistant space frames were designed in accordance with the 1976 Code for the Federal District of Mexico. They were subjected to a series of static and time history dynamic analyses. The results indicate that the designed buildings have significantly larger lateral strengths than required by the Code and that these overstrengths were the main reason for the excellent performance of most of the low-rise buildings in Mexico City during the 1985 Michoacan earthquake.


2020 ◽  
Vol 5 (6) ◽  
pp. 46 ◽  
Author(s):  
Foteini Konstandakopoulou ◽  
Maria Tsimirika ◽  
Nikos Pnevmatikos ◽  
George D. Hatzigeorgiou

Reinforced concrete retaining walls are concrete structures that are built to retain natural soil or fill earth. This study examines the lower cost-optimized design of retaining walls. Recently, a large number of modern optimization techniques were published, but a small number of them were proposed for reinforced concrete retaining walls. The proposed method develops a heuristic optimization approach to achieve the optimal design of these structures. This method simultaneously satisfies all structural, geotechnical, and European Code design restraints while decreasing the total cost of these structures. In order to confirm the efficiency and accuracy of the proposed method, characteristic retaining wall examples are demonstrated. Furthermore, the parametric investigation is examined to study the result of pertinent parameters on the minimum-cost static and seismic design of retaining structures.


2018 ◽  
Vol 22 (6) ◽  
pp. 1266-1283
Author(s):  
P. Ravi Prakash ◽  
Gaurav Srivastava

This article develops a fully coupled hydro-thermo-mechanical formulation based on the direct stiffness method for analysis of steel and reinforced concrete structural space frames. The superiority of the developed formulation lies in developing the direct stiffness method for fire analysis, which enables use of a much coarser spatial mesh when compared to existing fire analysis frameworks. Effects of temperature-dependent material properties, damage due to fire and pore pressure, nonlinear thermal gradients, and large deformations of structural members are directly integrated into the stability and bowing functions in the construction of the member stiffness matrix. This alleviates the need to perform element-level numerical quadrature, typically required by all existing finite element–based approaches. Full coupling between the pore pressure, thermal and mechanical solvers is considered through a two-level spatial discretization strategy with a staggered scheme for the numerical solution procedure. Five numerical examples are presented to demonstrate the accuracy and efficacy of the developed formulation in analysis of steel and reinforced concrete structural members and frames.


2016 ◽  
Vol 691 ◽  
pp. 148-159 ◽  
Author(s):  
Ivana Laníková ◽  
Petr Stepanek ◽  
Jakub Venclovský

This contribution describes the formulation of DBSO (deterministic based structural optimization) design of a tunnel lining. The principle by which a solution may be obtained for a problem concerning the dimensional and reinforcement design optimization of a concrete structure is introduced. The target function is defined as the minimum cost of used materials. The range of allowable solutions from the mathematical viewpoint is defined by constraining conditions expressed by relations derived from:equations of equilibrium (the solution of optimization calculations for a structure with a Winkler foundation using the finite element method),the reliability conditions of a reinforced concrete structure and from the continuity of deformations.The method (algorithm) for obtaining a serviceable reinforcement design (via the implementation of reinforcement types) from an optimal solution is described. The algorithm will be applied to the optimization of a tunnel lining design. FRP reinforcing bars will be used as reinforcement. The thickness of the tunnel lining and the areas of top and bottom reinforcement in cross-sections will be optimized. The obtained results will be compared with an optimized design created for the same tunnel structure but made from steel-reinforced concrete.


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