Seismic retrofit of reinforced concrete structures using magnetorheological mass driver: Evolving a design methodology

2019 ◽  
Vol 26 (7) ◽  
pp. e2353
Author(s):  
C. Bharathi Priya ◽  
N. Gopalakrishnan
Keyword(s):  
Reinforced Concrete ◽  
Design Methodology ◽  
Concrete Structures ◽  
Seismic Retrofit ◽  
Reinforced Concrete Structures

A study on the effect of sequential post-earthquake fire on the performance of reinforced concrete structures

2014 ◽  
Vol 5 (2) ◽  
pp. 141-166 ◽  
Author(s):  
Behrouz Behnam ◽  
Hamid Reza Ronagh
Keyword(s):  
Reinforced Concrete ◽  
Time Delay ◽  
Experimental Test ◽  
Design Methodology ◽  
Substantial Reduction ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Content Type ◽  
Earthquake Loads ◽  
Fire Loads

Purpose – Post-earthquake fire (PEF) can lead to a rapid collapse of structures partially damaged by earthquake. As there is almost no established PEF provisions by codes and standards, PEF investigations are therefore needed for those buildings. The paper aims to discuss these issues. Design/methodology/approach – A non-linear PEF analysis comprises three steps, which are the application of gravity loads, earthquake loads and then fire loads. As a fire generally initiates on one floor and then spreads to other floors, applying a sequential fire is more realistic than applying a concurrent fire on several floors. Hence, in this study, the fire is applied sequentially to the floors with a time delay. Findings – The results indicate a substantial reduction in the resistance of the damaged frame when subjected to PEF. In addition, the results of applying the PEF sequentially is more realistic than the concurrent fire. Research limitations/implications – It was better to perform an experimental test to have a better understanding of the issue. Originality/value – PEF can potentially result in a catastrophe in areas located in seismic regions. Thus, investigating the effect of PEF on previously damaged structures is of importance.

Design Methodology for Seismic Upgrading of Substandard Reinforced Concrete Structures

2007 ◽  
Vol 11 (4) ◽  
pp. 582-606 ◽  
Author(s):  
Georgia E. Thermou ◽  
Stavroula J. Pantazopoulou ◽  
Amr S. Elnashai
Keyword(s):  
Reinforced Concrete ◽  
Design Methodology ◽  
Concrete Structures ◽  
Reinforced Concrete Structures

scholarly journals Effect of corrosion degree on different steel ductility parameters, based on “Equivalent Steel” criterion

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Esther Moreno ◽  
Alfonso Cobo ◽  
Maria Nieves Gonzalez
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Design Methodology ◽  
Linear Models ◽  
Concrete Structures ◽  
Steel Corrosion ◽  
Reinforced Concrete Structures ◽  
Accelerated Corrosion ◽  
Rc Structures ◽  
Standing Structure

Purpose One of the meaningful effects of concrete reinforcement steel corrosion on concrete structures is the decrease of mechanical properties, specifically the ductility of steel. The term ductility of steel refers to a group of properties which determine the reinforced concrete structures and it is necessary to take this property into account for the recalculation of structures that have been already corroded until the point to condition in many occasions the analysis methodology. Design/methodology/approach This research studies the variation on ductility of concrete embedded steels bars after going through an accelerated corrosion process. Tensile strength of high ductility reinforcements with different corrosion levels has been tested. Ductility was studied in terms of ultimate tensile strength, yield strength, ultimate strain, energy density of deformation and “equivalent steel” criterion. It also makes some considerations about what is the best methodology of structural analysis according to the obtained results. Findings Based on the obtained results, conclusions are established that determine whether the corroded steel satisfy the requirements of different codes in order to identify them as “steels with special characteristics of ductility” assessing in each case the possibility of reallocating solicitations in structures which might need to be repaired. Originality/value The analysis of existing RC structures should address moment redistribution to be able to compare ultimate strength values, rather than to a single value obtained with elastic linear models to a range of values centred on the elastic and linear values obtained and defining an interval equal to double the value of the maximum redistribution capacity. This greatly enhances the possibility of “saving” a standing structure. In ductile structures the effect of actions can be distributed. The ascertainment of corroded reinforcement ductility variation is of key importance in structural re‐engineering and recalculation of structures. The research developed in this article is motivated by the need to contribute to knowledge of the behavior of reinforced concrete structures with reinforcement damaged.

Design of precast reinforced concrete structures of frame buildings: a new set of rules

2019 ◽  
pp. 4-9 ◽  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Building Frames ◽  
Fine Grained ◽  
Rigid Frame ◽  
Floor Slabs ◽  
Frame Buildings ◽  
Spatial System ◽  
Precast Elements

Currently, prefabricated reinforced concrete structures are widely used for the construction of buildings of various functional purposes. In this regard, has been developed SP 356.1325800.2017 "Frame Reinforced Concrete Prefabricated Structures of Multi-Storey Buildings. Design Rules", which establishes requirements for the calculation and design of precast reinforced concrete structures of frame buildings of heavy, fine-grained and lightweight structural concrete for buildings with a height of not more than 75 m. The structure of the set of rules consists of eight sections and one annex. The document reviewed covers the design of multi-story framed beam structural systems, the elements of which are connected in a spatial system with rigid (partially compliant) or hinged joints and concreting of the joints between the surfaces of the abutting precast elements. The classification of structural schemes of building frames, which according to the method of accommodation of horizontal loads are divided into bracing, rigid frame bracing and framework, is presented. The list of structural elements, such as foundations, columns, crossbars, ribbed and hollow floor slabs and coatings, stiffness elements and external enclosing structures is given; detailed instructions for their design are provided. The scope of the developed set of rules includes all natural and climatic zones of the Russian Federation, except seismic areas with 7 or more points, as well as permafrost zones.

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