scholarly journals THE INFLUENCE OF THE RIGIDITY OF REINFORCED CONCRETE STEPS ON THE SIZE OF THE RESPONSE OF BUILDINGS WITH A SEISMIC-INSULATING SLIDING BELT

2021 ◽  
pp. 91-97
Author(s):  
T. Bolotbek ◽  
Zh.T. Temirkanova ◽  
K.B. Bekbosunov ◽  
A.S. Musaev ◽  
A. Joldosh uulu
Keyword(s):  
Reinforced Concrete ◽  
Seismic Forces

The article examines the influence of the stiffness of reinforced concrete stops on the magnitude of the reaction of buildings using a sliding belt in modeling and the action of seismic forces.

Parametric study of medium span bridges retrofitted with reinforced concrete jacketing

2019 ◽  
Vol 46 (7) ◽  
pp. 567-580
Author(s):  
J.M. Jara ◽  
O. Montes ◽  
B.A. Olmos ◽  
G. Martínez
Keyword(s):  
Reinforced Concrete ◽  
Parametric Study ◽  
Seismic Behavior ◽  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Limit State ◽  
Highway Bridges ◽  
Main Emphasis ◽  
Seismic Forces ◽  
Bridge Models

Most reinforced concrete (RC) bridges in many countries are medium-span length structures built in the last decades and designed for very low seismic forces. The evolution of seismic codes and the average age of the bridges require the evaluation of their seismic vulnerability. This study assesses the expected capacity, demand and damage of seismically deficient medium-length highway bridges, supported in frame-type piers using dynamic nonlinear methodologies. A parametric study of reinforced concrete retrofitted bridges with RC jacketing was conducted. The non-retrofitted structures are 30 m span simple supported bridges with pier heights in the range of 5–25 m. The main emphasis of the study is the assessment of the jacket parameters’ contribution to the seismic vulnerability of bridges. Particularly, it is quantified how jacket thickness and reinforcement ratio affect the probability of reaching a particular damage limit state. The retrofitted scheme includes three jacket thicknesses and three different longitudinal steel ratios. The results evaluate bridge demands and fragility curves to quantify the influence of RC jacketing on the seismic response of structures and allow to select the best jacket parameters that improve the expected seismic behavior of the bridge models. Additionally, the influence of model hysteresis degradation on the expected damage of retrofitted bridges was also determined.

scholarly journals Dynamic Response of Reinforced Concrete Buildings with Coupled Beams

2020 ◽  
Vol 9 (1) ◽  
pp. 1868-1871
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Dynamic Systems ◽  
Inverted Pendulum ◽  
Design Parameters ◽  
Reinforced Concrete Buildings ◽  
Practical Design ◽  
Building System ◽  
Coupled Beams ◽  
Seismic Forces

Resistance of a building against seismic forces is one of the practical design parameters that considered while designing as well as during construction. In addition to the parameters, structural ponding is also a problem that occurs when the buildings are spaced closely during the earthquake. However, the functionality and objective of these buildings are different, which translates into different dynamic systems. Many techniques have been introducing and developing to design the structures safe. Coupling and bracing are some of the methods which hold the building together and act as a single inverted pendulum during the earthquake. In the present study, a horizontally coupled building system of 20 storey’s is developed separately with coupled beams and bracing systems. It is assumed that the two adjacent buildings were similar in this coupled building system, so the two adjacent stories could be coupled at the same height by an inter-building. And coupling with beams is introduced at different storey’s in the building, and results reveal that the building coupled beam at all storey showed the performance of the building in terms of displacement, storey drift, and storey shear.

scholarly journals A Simplified Approach for Analysis and Design of Reinforced Concrete Circular Silos and Bunkers

2018 ◽  
Vol 12 (1) ◽  
pp. 234-250
Author(s):  
Muhammad Umair Saleem ◽  
Hassan Khurshid ◽  
Hisham Jahangir Qureshi ◽  
Zahid Ahmad Siddiqi
Keyword(s):  
Reinforced Concrete ◽  
Design Procedure ◽  
Bending Moment ◽  
Efficient Design ◽  
Simplified Approach ◽  
Analysis And Design ◽  
Design Procedures ◽  
Axial Forces ◽  
Design Skills ◽  
Seismic Forces

Background: Reinforced concrete silos and bunkers are commonly used structures for large storage of different materials. These structures are highly vulnerable when subjected to intense seismic forces. Available guidelines for analysis and design of these structures require special design skills and code procedures. Objective: The current study is aimed to elaborate the design procedures from different sources to a unified method, which can be applied to a larger class of reinforced concrete silos. In this study, analysis and design procedures are summarized and presented in a simplified form to make sure the efficient practical design applications of reinforced concrete silos. Method: Four different cases of silo design based on the type and weight of stored material were considered for the study. For each case, the silo was designed using given design procedure and modeled using FEM-based computer package. All of the reinforced concrete silos were subjected to gravity, wind and seismic forces. Results: After performing the analysis and design of different silos, the bending moment, shear force and axial forces profiles were given for a sample silo. The results obtained from the proposed design procedure were compared with FEM values for different components of silos such as slab, wall and hopper. Conclusion: The comparison of tangential and longitudinal forces, bending moments, shear forces and reinforcement ratios of different parts of silos have shown a fair agreement with the FEM model results. It motivates to use the proposed design procedure for an efficient design of reinforced concrete silos.

scholarly journals Effects of Beam Members on Performance of Buildings under Seismic Forces

2019 ◽  
Vol 8 (3) ◽  
pp. 7797-7803
Keyword(s):  
Reinforced Concrete ◽  
Seismic Analysis ◽  
Lateral Force ◽  
Seismic Zone ◽  
Response Factors ◽  
Cross Sectional ◽  
Force System ◽  
Beam Elements ◽  
Time Period ◽  
Seismic Forces

The main aim of the paper is to present an analysis to study on non-linear seismic analysis of reinforced concrete (RC) framed buildings as per the provisions of Indian code IS1893-2016 to evaluate the response of the building configurations depending upon the section sizes of the horizontal members; beams and as per variation in its cross-sectional area. The response of buildings has been noted in terms of quantities as the time period of buildings.Indian seismic code IS 1893 has been employed for the design provisions of the seismic analysis and the structures have been evaluated for seismic zone II. The design software STAAD.Pro has been used for the dynamic analysis.The response of the structure under lateral force system, induced due to seismic activities is must be analysed to understand the behaviour of structure under dynamic forces. The paper evaluates the most common but important response factors of the structure which are most important in the design of building. The paper also shows the detailed results of the time period of buildings for various building configuration. The evaluated results have been tabulated and analysed with the help of a comparative study of the obtained data. The work is useful for better understanding of the performance of the reinforced concrete buildings as per the different sizes and sections and stiffness of the beam elements.

scholarly journals A note on the earthquake performance of reinforced concrete shear walls

1969 ◽  
Vol 2 (2) ◽  
pp. 193-198
Author(s):  
Karl V. Steinbrugge ◽  
Henry J. Degenkolb
Keyword(s):  
Reinforced Concrete ◽  
Shear Walls ◽  
The United States ◽  
Concrete Walls ◽  
Reinforced Concrete Walls ◽  
Structural Panel ◽  
Earthquake Performance ◽  
Seismic Loadings ◽  
Strength And Stiffness ◽  
Seismic Forces

A great many one and two story buildings as well as many buildings as tall as 10 stories or higher have cast in situ reinforced concrete walls designed to act as shear walls for resisting seismic forces. Allowable design stresses in reinforced concrete shear walls have been increased in recent years in many building codes, although in one major code they have been drastically reduced. Concurrently, modern architectural trends have often resulted in the reduction of certain reserve strength features neglected in seismic design such as "non-structural" panel walls of brick or of reinforced concrete since these elements are often replaced by glass or by insulated metal panels. This, in effect, results in greater applied seismic forces on the shear walls. The frequent elimination of deep spandrel beams in favor of thin slabs which may meet glass or metal walls also tends to increase stresses in the shear walls since the strength and stiffness of the spandrels were often neglected when interior shear walls existed. In summary, it has been the experience in the United States and in many other countries in the world that the effective factor of safety in reinforced concrete shear walled structures has often been substantially reduced for seismic loadings. In many cases, inadequate methods of analysis have neglected critical stresses at boundaries and openings.

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