The Framework of the 2014 American Concrete Institute (ACI) 318 Structural Concrete Building Code
TL;DR: ACI Committee 318 has taken a fresh perspective and reorganized the Code to provide a more user-friendly back bone for design and it is believed that changes made to future versions of the Code will be more transparent and obvious such that designers do not miss new requirements.
Abstract: The structure of the current ACI Building Code has remained essentially unchanged since 1963 when ultimate strength was added. Knowledge has expanded with time through practice and research. In str...
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TL;DR: In this article, an 11-story reinforced concrete structure following severe initial damage is studied experimentally and analytically, and it is demonstrated that axial compressive force can significantly affect progressive collapse resistance of the structure, and the shortcomings of nonlinear modeling with commonly used plastic hinges are quantified and discussed.
Abstract: Progressive collapse resistance of an actual 11-story reinforced concrete structure following severe initial damage is studied experimentally and analytically. The initial damage was caused by simultaneous explosion (removal) of four first-floor neighboring columns and two second-floor perimeter deep beam segments. The structure resisted progressive collapse with a maximum permanent vertical displacement at the top of the exploded columns of only about 56 mm (2.2 in.). The response of the structure is evaluated analytically using different modeling methods. Beam growth and, in turn, the development of the beam axial compressive force are modeled and discussed. It is demonstrated that such axial compressive force can significantly affect progressive collapse resistance of the structure. The shortcomings of nonlinear modeling with commonly used plastic hinges are quantified and discussed. It is shown that such a modeling method ignores axial and flexural interaction in beams and can underestimate the resist...
125 citations
TL;DR: A time-dependent model is developed that can simulate all stages of reinforced concrete corrosion, i.e. corrosion initiation, crack initiation and propagation, and the extent of damage is quantified by considering the spatial variability of the various parameters.
124 citations
TL;DR: In this paper, a unified stress-strain model suitable to represent the axial behavior of circular and square/rectangular reinforced-concrete columns confined internally with transverse steel reinforcement (TSR), externally with fiber reinforced polymer (FRP), or both internally and externally with TSR and FRP, respectively, is presented.
91 citations
TL;DR: In this article, the use of small diameter whole-culm (bars) and split bamboo (a.k.a. splints or round strips) has been proposed as an alternative to relatively expensive reinforcing steel in reinforced concrete.
Abstract: The use of small diameter whole-culm (bars) and/or split bamboo (a.k.a. splints or round strips) has often been proposed as an alternative to relatively expensive reinforcing steel in reinforced concrete. The motivation for such replacement is typically cost—bamboo is readily available in many tropical and sub-tropical locations, whereas steel reinforcement is relatively more expensive—and more recently, the drive to find more sustainable alternatives in the construction industry. This review addresses such ‘bamboo-reinforced concrete’ and assesses its structural and environmental performance as an alternative to steel reinforced concrete. A prototype three bay portal frame, that would not be uncommon in regions of the world where bamboo-reinforced concrete may be considered, is used to illustrate bamboo reinforced concrete design and as a basis for a life cycle assessment of the same. The authors conclude that, although bamboo is a material with extraordinary mechanical properties, its use in bamboo-reinforced concrete is an ill-considered concept, having significant durability, strength and stiffness issues, and does not meet the environmentally friendly credentials often attributed to it.
74 citations
TL;DR: In this paper, the feasibility of newly developed basalt fiber reinforced polymer (BFRP) as prestressing material and the structural behavior of reinforced concrete (RC) beams strengthened with externally prestressing BFRP tendons were investigated.
73 citations
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29 Apr 2009
1 citations