LUEVANOS-ROJAS, Arnulfo; LOPEZ-CHAVARRIA, Sandra; MEDINA-ELIZONDO, Manuel ?and? KALASHNIKOV, Vitaliy V.. Optimal design of reinforced concrete beams for rectangular sections with straight haunches. Revista de la Construcción [online]. 2020, vol.19, n.1, pp.90-102. ISSN 0718-915X.? http://dx.doi.org/10.7764/rdlc.19.1.90-102. Objective of this research is to present a mathematical model for optimal design of rectangular cross-section beams with straight haunches under the criterion of minimum cost considering the concrete cost and reinforcing steel cost, and taking into account the equations of the regulation (ACI 318S-14). This model presents the equations for a uniformly distributed load and a concentrated load located anywhere on the beam. Two examples are developed by the proposed model, one for uniformly distributed load and another for concentrated load showing the best solution for each case. The results show the following: a) The prismatic beams for uniformly distributed load have a total cost of the 8% greater, a total volume and a total weight of the 9% greater with respect to the non-prismatic beams; b) The prismatic beams for concentrated load have a total cost, a total volume and a total weight of the 6% greater with respect to the non-prismatic beams. The main conclusions are: For a smaller b width the optimal design for both models is presented. The non-prismatic beams are more economical, also these have less volume and less weight with respect to prismatic beams.
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机译:Luevanos-Rojas,arnulfo; Lopez-Chavarria,桑德拉; Medina-Elizondo,曼努埃尔?和? Kalashnikov,Vitaliy V ..直箱矩形截面钢筋混凝土梁的最佳设计。 Revista de laConstucción[在线]。 2020,Vol.19,N.1,PP.90-102。 ISSN 0718-915x。? http://dx.doi.org/10.7764/rdlc.19.1.90-102。本研究的目的是提供一种数学模型,用于考虑混凝土成本和增强钢成本的最小成本标准下的矩形横截面梁的最佳设计数学模型,并考虑到规定的方程(ACI 318S- 14)。该模型呈现出均匀分布式负载的方程和位于光束的任何位置的集中负载。由所提出的模型开发了两个示例,一个用于均匀分布的负载,另一个用于浓缩负荷,显示每种情况的最佳解决方案。结果表明以下:a)均匀分布载荷的棱柱形光束的总成本为8%,总体积和相对于非棱柱形梁的总体积和总重量较大; b)用于浓缩载荷的棱柱形光束具有总成本,总体积和相对于非棱柱形梁的总重量更大6%。主要结论是:对于较小的B宽度,提出了两种模型的最佳设计。非棱柱形光束更经济,这些梁也具有较小的体积和相对于棱柱梁的重量较小。
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