Analysis and Design of Beams Reinforced with Steel Fiber and Composite Plates

2020 ◽  
Vol 38 (2A) ◽  
pp. 113-125
Author(s):  
Mereen H. Fahmi Rasheed ◽  
Ayad Z. Saber Agha
Keyword(s):  
Bending Moment ◽  
Composite Plates ◽  
Steel Fibers ◽  
Reinforced Concrete Beams ◽  
Effective Technique ◽  
Shear Strengthening ◽  
Moment Capacity ◽  
Analysis And Design ◽  
Tension And Compression ◽  
The Moment

The addition of epoxy bending plate to the tension and compression faces or web is an effective technique for flexural or shear strengthening of reinforced concrete beams, also using of steel fibers with concrete improves the structural behavior and increases the moment capacity and shear resistance of the beams. General equations are derived for predicting the bending moment capacity, maximum and balancing reinforcement ratio the equivalent depth of the compression zone for singly and doubly reinforced rectangular sections and T-beams. The results indicate that bending moment capacity increased in beams with steel fibers and composite plates, while the maximum balancing reinforcement ratios are decreased.

THE INFLUENCE OF THE NUMBER AND POSITION OF DOWELS ON THE BENDING MOMENT CAPACITY OF HEAT-TREATED WOOD DOWEL JOINTS

2021 ◽  
Vol 14(63) (1) ◽  
pp. 67-76
Author(s):  
Bogdan I. BEDELEAN ◽  
Iosif NECULĂEȘ ◽  
Cosmin G. SPÎRCHEZ ◽  
Sergiu RĂCĂȘAN
Keyword(s):  
Cross Section ◽  
Treated Wood ◽  
Bending Moment ◽  
Moment Capacity ◽  
Moment Arms ◽  
Heat Treated ◽  
Wood Dowel ◽  
Ultimate Failure ◽  
The Cross ◽  
The Moment

In this work, the influence of the number of dowels and the option to place the dowels in the cross section of part on the bending moment capacity of heat-treated wood dowel joints was analysed. The joints, which were made of heat-treated ash, were tested by means of a universal testing machine.The ultimate failure load and the moment arms were used to figure out the bending moment capacity of the joints loaded in compression or in tension. The number of dowels affected the tensile strength of the L-shaped heat-treated wood joints. The modality to place the dowels in the cross section of rail, namely, in collinearity or in a triangular shape, did not significantly affect the strength of the heat-treated wood dowel joints.

Study of Bending Capacity of an HPHT CRA-Lined Seamless Pipeline

2014 ◽  
Author(s):  
Cyprian Gil ◽  
Knut Tørnes ◽  
Per Damsleth
Keyword(s):  
Internal Pressure ◽  
Strain Localization ◽  
Local Buckling ◽  
Bending Moment ◽  
Design Criteria ◽  
Design Codes ◽  
Moment Capacity ◽  
Wide Range ◽  
Global Buckling ◽  
The Moment

A study has been performed to better understand ultimate bending moment and strain capacities of pipelines in relation to criteria defined in the design codes. An 18″ HPHT flowline was designed to undergo global buckling on uneven seabed and to resist trawl gear interference. The high temperature (155 degC) and pressure (300 bar) posed considerable design challenges for material selection and design criteria. A CRA-lined X60 CMn pipeline was selected for the project. The pipeline was of seamless manufacture for which the stress/strain characteristics are subject to the effect of Lüders bands. The DNV-OS-F101 code covers a wide range of D/t but does not specifically address Lüder’s material behaviour which could significantly reduce the bending moment capacity of pipe. The global buckling and trawl pull-over FE analysis results indicated the pipe was highly utilized, requiring excessive amounts of seabed intervention at great cost to meet the DNV LCC criteria. Detailed FE simulation of limit states for local buckling and strain localization of a 3D solid element pipe model was performed, with both Roundhouse and Lüders material properties, to investigate pipe capacity in relation to that stipulated by the design codes. The pipe moment capacity was established by obtaining the moment curvature relationship by bending the local pipe section subject to internal pressure until the maximum resistance was reached. Imperfections were introduced to initiate local buckling at the desired location. To determine strain concentration factors and strain localization, the effects of thickness changes and weld misalignment were also studied. The DNV OS-F101 LCC moment criterion formulation computes a decreasing moment capacity for increasing internal pressure. It has been suggested in the literature that this is correct for higher D/t but the criterion may be conservative for pipes with lower D/t. The combination of Lüders material with low D/t is not specifically addressed by any design code. Clarification of these aspects will provide a better understanding of the risk of failure for highly utilized seamless pipelines and allow for modified design criteria that will reduce seabed intervention costs. The results of the study showed that a higher bending moment criterion and associated strain criterion could be adopted for the design that allows for the higher initial strain caused by Lüder’s plateau. The ultimate bending moment capacity of low D/t pipe with Lüder’s material was found to be similar to that of Roundhouse material due to work hardening. In addition, it was demonstrated that the potential strength of the CRA liner could enhance the moment capacity of the seamless pipe.

scholarly journals Simplified Method to Estimate the Moment Capacity of Circular Columns Repaired with UHPC

2019 ◽  
Vol 4 (3) ◽  
pp. 45 ◽  
Author(s):  
Mahsa Farzad ◽  
Siavash Rastkar ◽  
Amir Sadeghnejad ◽  
Atorod Azizinamini
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Bending Moment ◽  
Basic Material ◽  
Ultra High Performance Concrete ◽  
Moment Capacity ◽  
Simplified Approach ◽  
Reinforced Concrete Bridge ◽  
The Moment ◽  
Sectional Analysis

Ultra high-performance concrete (UHPC) application, to enhance the mechanical strength of axially loaded reinforced concrete bridge substructure elements, was proposed and investigated in an earlier study. The results recommended that depending on the UHPC shell thickness, this method may cause shifting of the critical section to undesired locations, due to over-strengthening of the repaired section, and this should be a design consideration. This paper proposes a new simplified analytical approach to calculate the bending moment capacity of the repaired circular section. This method relies on hand calculations and only requires basic material properties (compressive and tensile strengths). The results from the simplified approach are validated with a well-established numerical sectional analysis method. The proposed approach may be considered simple and more straightforward for professional engineers.

scholarly journals Mathematical Model for Analysis of Uniaxial and Biaxial Reinforced Concrete Columns

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Mohammed Salem Al-Ansari ◽  
Muhammad Shekaib Afzal
Keyword(s):  
Mathematical Model ◽  
Reinforced Concrete ◽  
Load Capacity ◽  
Computer Software ◽  
Moment Capacity ◽  
Analysis And Design ◽  
Finite Element Software ◽  
Axial Load Capacity ◽  
Tension And Compression ◽  
Average Variation

This paper presents a mathematical model for the analysis of reinforced concrete (RC) uniaxial and biaxial columns. This proposed model is a quick and faster approach for the analysis and design of reinforced concrete rectangular columns without going through the interaction charts procedure as well as other iterative methods for the computation of required axial load capacity (Pc) and moment capacity (Mc). A simplified flow chart has also been developed to find the required column capacity using this mathematical model. Eight uniaxial columns (C-1 to C-8) and seven biaxial columns (CB-1 to CB-7) are analysed in this study. Each column is analysed having different steel reinforcement ratios ρ with different loading conditions. In addition, the studied columns are subjected to both tension and compression failures. The detailed examples for both uniaxial and biaxial columns (one for each case) are also presented in this study. The studied columns are also analysed using computer software spColumn. The average variation of the mathematically computed values to the finite element software is not more than 10%, showing promising computational results.

scholarly journals Efficiency of Steel Fiber on Carrying Capacity of Short Square Columns

2018 ◽  
Vol 4 (7) ◽  
pp. 1584
Author(s):  
Haider Abdulridha Alkufi ◽  
Mohannad Husain Al-Sherrawi
Keyword(s):  
Cross Section ◽  
Carrying Capacity ◽  
Applied Load ◽  
Ultimate Load ◽  
Steel Fiber ◽  
Fiber Type ◽  
Bending Moment ◽  
Plain Concrete ◽  
Steel Fibers ◽  
Moment Capacity

An experimental investigation is carried out to find the beneficial effect of adding steel fiber to reinforced concrete square columns. Hooked end steel fiber type is used in this investigation. The aspect ratio is 60 and the percentages of the steel fiber that added to the concrete are 0.5%, 1.0% and 1.5%. The experimental work consists of fabricated twenty columns to observe the effect of steel fibers on the axial and bending moment capacity. The specimens are classified into five groups according to the applied load on it. Each of these groups is consisted of four columns having different steel fiber ratios (0, 0.5, 1.0 and 1.5) %. The columns are tested under concentric, eccentric with variable eccentricities and two-point loading. All tested columns in a one group having the same dimensions, same interior reinforcement and were tested under one applying–load and they have a square cross-section with a dimension of (100 × 100) mm. Specimens with steel fiber results are compared with the control specimen of their own (columns mad of plain concrete). The results showed that increasing steel fiber ratio is caused an increasing in the first cracking load and an increase in the ultimate load for all tested columns.

scholarly journals Analisis Kapasitas Lentur Balok Beton Tulang Berongga Akibat Perbedaan Kuat Tarik Tulangan

2021 ◽  
Vol 21 (3) ◽  
pp. 681-689
Author(s):  
Syahrul Sariman ◽  
Rita Irmawaty
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Carrying Capacity ◽  
Concrete Beams ◽  
Bending Moment ◽  
Reinforced Concrete Beams ◽  
The Difference ◽  
The Moment

Penelitian ini bertujuan menetapkan karakteristik lentur balok beton tulang berongga akibat perbedaan kuat tarik tulangan.  Dalam penelitian ini  digunakan balok beton bertulang dengan mutu beton f’c=27Mpa dan dimensi  150x350mm, Panjang 3300mm dengan tulangan pokok 3D16mm  dengan kuat leleh fy=475 Mpa (type WS) dan fy=324MPa (type RM). Setiap balok dengan type tulangan yang berbeda  terdiri dari   3 balok yang dibedakan menurut panjang rongganya dan diberi notasi  BR3A,  BR3B dan BR3C.  dengan tinggi rongga tetap : 180mm. Hasil penelitian menunjukkan bahwa  variasi rongga  tidak mempengaruhi kapasitas setiap balok  dalam memikul momen. Perbedaan kapasitas momen lentur disebabkan oleh perbedaan kuat tarik baja tulangan. This study aims to determine the flexural characteristics of hollow reinforced concrete beams due to differences in the tensile strength of reinforcement. In this study used reinforced concrete beams  f'c=26.85 MPa and dimensions 150x350mm, length 3300mm.  Bar reinforcement of  3D16mm with fy=475Mpa  (WStype) and fy=324MPa (RMtype). Each beam with a different type of reinforcement consists  of  3  beams that are distinguished by the length of the hollow which is  namely BR3A, BR3B and  BR3C.  with a fixed hollow  height (180mm). The results showed that hollows variations did not affect the carrying capacity of the moment. Different of  capacity  bending moment is caused by the difference in the tensile strength of the reinforcement

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