Design of Reinforced Concrete Sections Under Bending and Axial Forces

2022 ◽  
Author(s):  
Helena Barros ◽  
Joaquim Figueiras ◽  
Carla Ferreira ◽  
Mário Pimentel
Keyword(s):  
Reinforced Concrete ◽  
Axial Forces

scholarly journals Seismic Behavior of Mid-Rise Precast Reinforced Concrete Building with Effect of Joints and Supports

2019 ◽  
Vol 8 (4) ◽  
pp. 3633-3637
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Precast Concrete ◽  
Mode Shapes ◽  
Base Shear ◽  
Reinforced Concrete Building ◽  
Axial Forces ◽  
Building Models ◽  
Precast Buildings ◽  
Concrete Building

Precast concrete structures are widely used in construction. It consists of prefabricated elements casted in industry and connected to each other to form a homogeneous structure. Connections function is to transfer moments and axial forces. Many engineers assume precast connection as pinned, but in reality, they are semi-rigid connections that transfer forces to other members. Lack of design and detailing of connection leads to improper behaviour of the structure, which then leads to the collapse of the building. Past earthquake studies show that many precast buildings performed poorly, and the main reasons were connections. This paper mainly focuses on understanding the seismic behaviour of mid-rise i.e seven-storey precast reinforced concrete buildings with various beam-column joints i.e rigid, semi-rigid, pinned and column-base supports i.e, fixed and hinged supports. Building is modelled and analyzed using ETABS v17 software. Rotational stiffness of precast billet connection is adopted for modelling of semi-rigid beam-column connections. Response spectrum and modal analysis are carried out. Results of displacements, storey drift, storey shear, storey stiffness, base shear, time periods and first mode shapes of models are discussed. It is observed, precast reinforced concrete building models with semi rigid connection performs better than building models with pinned connections and building models with fixed supports reduces the structural response to a great extent.

Design aids for rectangular reinforced concrete sections under combined bending and axial forces

1988 ◽  
Vol 15 (5) ◽  
pp. 916-928 ◽  
Author(s):  
P. Riva ◽  
M. Z. Cohn
Keyword(s):  
Reinforced Concrete ◽  
Portland Cement ◽  
Key Words ◽  
Axial Compression ◽  
Strength Analysis ◽  
Short Columns ◽  
Axial Forces ◽  
Portland Cement Association

Design interaction diagrams, Pr–Mr, for rectangular reinforced concrete sections under combined bending and axial compression or tension forces in accordance with the current Canadian code are presented. The interest of the note is that the interaction diagrams eliminate the limitations of those in the Canadian Portland Cement Association Handbook. Their format can be extended to other section shapes and reinforcement layouts. Key words: Combined bending, design aids, interaction diagrams, rectangular sections, reinforced concrete, short columns, strength analysis.

scholarly journals Pengaruh Lubang Pada Kolom Akibat Gaya Aksial Tekan

2018 ◽  
pp. 1-8
Author(s):  
Samsuardi Batubara ◽  
Danastasia Manik
Keyword(s):  
Reinforced Concrete ◽  
Theoretical Calculation ◽  
Ultimate Load ◽  
Concrete Specimen ◽  
Test Results ◽  
Shear Reinforcement ◽  
Axial Capacity ◽  
Axial Forces ◽  
Capacity Degradation ◽  
The Given

This research aims to investigate the effect of hole in reinforced concrete on column capacity, particularly in carrying axial forces. Tests were performed by applying axial forces on two types of sample: with-hole and without-hole. The ultimate load obtained from both type of samples was compared to determine the effect of the hole in the concrete specimen. Four samples were made, namely: no-hole in sample; hole sized 1” (2.25% of sample gross weight); sized 1¼” (3.52%); sized 1½” (5.067%). The dimension of the sample is 15x15cm, and 150cm height. These four samples are reinforced with 4D10 and shear reinforcement of ϕ6. Testing equipment used in this research is jack hydraulic with capacity of 200 tons. Based on theoretical calculation, capacity degradation caused by hole inside a column is not significant. However, our test results show that axial capacity of the colum is significantly affected by the given hole. Sample with 3.52% of sample gross weight suffered a 20.76% degradation, and sample with 5.067% of sample gross weight suffered a 33.27% degradation.

scholarly journals SUGGESTIONS TO THE DESIGN OF STEEL REINFORCED CONCRETE MEMBERS SUBJECTED TO BENDING AND AXIAL FORCES

1980 ◽  
Vol 1980 (295) ◽  
pp. 115-123
Author(s):  
Hajime OKAMURA ◽  
Hidetaka UMEHARA ◽  
Kazuhiko YAMADA ◽  
Matsuji ENOMOTO
Keyword(s):  
Reinforced Concrete ◽  
Steel Reinforced Concrete ◽  
Concrete Members ◽  
Axial Forces

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.

EFFECTS OF RANDOMLY DISTRIBUTED INFILL ON COLUMNS OF REINFORCED CONCRETE FRAMES WITH SOFT GROUND STOREY

2010 ◽  
Vol 10 (03) ◽  
pp. 555-569 ◽  
Author(s):  
SHAHRIAR QUAYYUM ◽  
ISLAM MOHAMMAD NAZMUL ◽  
MOST. MAHBUBA IASMIN ◽  
KHAN MAHMUD AMANAT
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Base Shear ◽  
Concrete Frames ◽  
Natural Period ◽  
Rc Frames ◽  
Axial Forces ◽  
Open Ground ◽  
Seismic Loadings ◽  
Structural Responses

Reinforced concrete (RC) frames with an open ground floor and various infill distributions have been analyzed for seismic loadings by the finite element method. The infills have been modeled by diagonal struts. Focus is placed on the effects of infill distribution on various structural responses, including (i) the lateral deflection, (ii) the column axial forces, (iii) the column bending moments, (iv) the base shear, and (v) the natural period of the frame. The equivalent static force method (ESFM) and response spectrum method (RSM) for linear structures have been applied, and the results obtained have been compared. It was found that the structural responses do not change appreciably by the ESFM analysis for random infill distributions, while they increase noticeably in the RSM analysis. This manifests the inadequacy of using the ESFM for general purposes, for which modifications were proposed in this paper for the design of RC columns. As the natural period of the RC frame converges with the code equations only for higher amounts of infill, it is necessary to incorporate the amount and distribution of infill in the dynamic analysis of RC frames.

Non-Linear Analysis of AP1000 Auxiliary and Shield Building Subjected to Combined Accident Thermal and Seismic Loadings

2014 ◽  
Author(s):  
J. Jennifer Zhang ◽  
Lee J. Tunon-Sanjur
Keyword(s):  
Reinforced Concrete ◽  
Thermal Loading ◽  
Structural Response ◽  
Nonlinear Behavior ◽  
Element Model ◽  
Reduction Factor ◽  
Axial Forces ◽  
Wall Stiffness ◽  
Seismic Loadings ◽  
The Impact

Under the combined accident thermal and seismic loadings, the structural response of the AP1000 Auxiliary and Shield Building (ASB) is numerically investigated. A nonlinear Finite Element Model (FEM) of the AP1000 ASB is developed, in which the rebar in the reinforced concrete is explicitly described and the nonlinear behavior of the concrete is considered. The numerical modeling method and material models used by the reinforced concrete are validated by the testing results published in the literature. The propagation of the thermal loading-induced concrete cracks along the wall thickness is studied. Furthermore, the effects of thermal cracks on the wall stiffness, the development of the thermal stress and the axial forces acting on the reinforcement are fully discussed. The impact of thermal concrete cracks on the design demand of the rebar is also investigated. It is worthy of being further studied how to incorporate the appropriate reduction factor caused by concrete cracks into the linear structural design.

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