scholarly journals Development Of A Quick Design Method For Composite Concrete Slab-Over Steel I-Girder Bridges For Project Bidding

2021 ◽  
Author(s):  
Ahmed Diab ◽  
Khaled Sennah
Keyword(s):  
Design Method ◽  
Concrete Slab ◽  
Design Procedure ◽  
Bending Moment ◽  
Moment Of Inertia ◽  
Inertia Moment ◽  
Girder Bridges ◽  
Truck Loading ◽  
Load Effects ◽  
Bare Steel

In bridge analysis, designers calculate maximum bending moment, MT, and shear force, VT, of a bridge girder under truck loading, then use available truck fraction, FT to generate the longitudinal live load effects. This Thesis presents structural analysis of different girder configurations subjected to CL-W truck loading. Girder geometries include single-, two-, three- and four-span girders. The maximum shear, deflection and moments were plotted and then used to develop equations to represent their values. Furthermore, a software was developed to perform composite steel I-girder design. The software optimizes the I-girder size based on CHBDC design procedure. Using the developed software, a parametric study was conducted to determine the required composite moment of inertia, moment of inertia of the bare steel section and steel web area to satisfy all design requirements. Empirical equations for these three properties were developed to assist bridge designers in estimating steel I-section sizes for contract bidding.

scholarly journals Development Of A Quick Design Method For Composite Concrete Slab-Over Steel I-Girder Bridges For Project Bidding

2021 ◽  
Author(s):  
Ahmed Diab ◽  
Khaled Sennah
Keyword(s):  
Design Method ◽  
Concrete Slab ◽  
Design Procedure ◽  
Bending Moment ◽  
Moment Of Inertia ◽  
Inertia Moment ◽  
Girder Bridges ◽  
Truck Loading ◽  
Load Effects ◽  
Bare Steel

In bridge analysis, designers calculate maximum bending moment, MT, and shear force, VT, of a bridge girder under truck loading, then use available truck fraction, FT to generate the longitudinal live load effects. This Thesis presents structural analysis of different girder configurations subjected to CL-W truck loading. Girder geometries include single-, two-, three- and four-span girders. The maximum shear, deflection and moments were plotted and then used to develop equations to represent their values. Furthermore, a software was developed to perform composite steel I-girder design. The software optimizes the I-girder size based on CHBDC design procedure. Using the developed software, a parametric study was conducted to determine the required composite moment of inertia, moment of inertia of the bare steel section and steel web area to satisfy all design requirements. Empirical equations for these three properties were developed to assist bridge designers in estimating steel I-section sizes for contract bidding.

Issues on Design of Piled Raft Foundation

2018 ◽  
Vol 14 (1) ◽  
pp. 6057-6061 ◽  
Author(s):  
Padmanaban M S ◽  
J Sreerambabu
Keyword(s):  
Contact Area ◽  
Concrete Slab ◽  
Design Procedure ◽  
Bending Moment ◽  
Foundation Design ◽  
Detailed Review ◽  
Piled Raft ◽  
Piled Raft Foundation ◽  
Raft Foundation ◽  
Influencing Parameters

A piled raft foundation consists of a thick concrete slab reinforced with steel which covers the entire contact area of the structure, in which the raft is supported by a group of piles or a number of individual piles. Bending moment on raft, differential and average settlement, pile and raft geometries are the influencing parameters of the piled raft foundation system. In this paper, a detailed review has been carried out on the issues on the raft foundation design. Also, the existing design procedure was explained.

Composite design method for masonry walls on concrete beams

1983 ◽  
Vol 10 (3) ◽  
pp. 337-349 ◽  
Author(s):  
B. Stafford Smith ◽  
L. Pradolin
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Design Method ◽  
Design Procedure ◽  
Bending Moment ◽  
Reinforced Concrete Beam ◽  
Masonry Wall ◽  
Reinforced Concrete Beams ◽  
Steel Beams ◽  
Arch Action

This paper describes a design method for structures consisting of a vertically loaded masonry wall supported by a reinforced concrete beam, taking account of the composite tied-arch action of the wall and beam. Experimental results have shown that the behaviour of walls on reinforced concrete beams is similar enough to that of walls on steel beams to allow the development of a design procedure for the former using similar principles to that for walls on steel beams. Therefore, the design approach is based on the assumption of triangular distributions of vertical stress at the wall–beam interface, where the length of the distributions are a function of the beam-to-wall relative stiffness. In the design method the beam flexural stiffness is designed to give an adequate distribution of the interface stress so that the maximum stress in the wall does not exceed allowable limits. The beam is also designed with flexural and shear reinforcement sufficient to resist the bending moment, tie force, and shear forces applied by the normal and shear interface loading. Experimental evidence as well as analytical results are cited to support the assumptions and the resulting design method.

scholarly journals A Design Method to Assess the Primary Strength of the Delta-Type VLFS

2021 ◽  
Vol 9 (9) ◽  
pp. 1026
Author(s):  
Roy Gafter ◽  
Nitai Drimer
Keyword(s):  
Critical Load ◽  
Assessment Tool ◽  
Design Method ◽  
Axial Stress ◽  
Bending Moment ◽  
Initial Assessment ◽  
Floating Structure ◽  
Open Sea ◽  
Load Effects ◽  
New Type

Very large floating structure (VLFS) is a sustainable concept centered around creating solid platforms at sea. The Delta is a new type of VLFS, designed to withstand open-sea conditions and to form, in addition to a broad deck areas, a sheltered basin of year-round operability. The design of this unique hull relies on direct calculations in order to identify critical load cases and assess their load effects. This study formulates a theoretical procedure for the initial assessment of the primary strength. The procedure analytically integrates the floatation loads while the hull rests at hydrostatic equilibrium on a wave surface and obtains the vertical and horizontal bending moment. This preliminary assessment tool enables a fast review of many load cases and provides the basic insights necessary for a reasonable initial design. Using the procedure, we conducted a primary load assessment for the design of Delta. By calculating the load response to 588 load cases, we identified the critical load scenario and the maximal axial stress. As the stress was too high, we improved the geometry in order to reduce loads and assessed proper scantlings for the critical section. We present the formulation of the procedure, the validation of the results, and the implementation for the structural design of the Delta VLFS.

Theoretical Analysis of SSCC Floor System of through Truss High-Speed Railway Bridges

2011 ◽  
Vol 250-253 ◽  
pp. 1728-1733 ◽  
Author(s):  
Ye Zhi Zhang ◽  
Liang Chen
Keyword(s):  
High Speed ◽  
Concrete Slab ◽  
Axial Stress ◽  
Bending Moment ◽  
Bending Stress ◽  
Inertia Moment ◽  
High Speed Railway ◽  
Railway Bridges ◽  
Floor Systems ◽  
Floor System

In SSCC floor systems the concrete slab is composite with both steel stringers and crossbeams or only with stringers. The horizontal bending of the crossbeams of SSCC floor systems is not ignorable. From the deformation conforming condition, theoretical formulas for SSCC floor systems of double-railway bridges with two stringers are developed. The factors which influence the horizontal bending of crossbeams are discussed. Some conclusions are obtained. When the width of the SSCC floor system is given, the main factors which influence the horizontal bending of the crossbeams are the axial stress of the lower chords, the distance between the side stringers and the lower chords, and the continuous length of SSCC floor system. Increasing the horizontal inertia moment of crossbeams almost cannot reduce the horizontal bending stress of crossbeams. A slight horizontal rotation of the lower joints such as 10-4 rad can release more than 3% crossbeam end horizontal bending moment.

scholarly journals Curved Concrete Slab-On-Steel I-Girder Bridges

2021 ◽  
Author(s):  
Joseph Wassef
Keyword(s):  
Load Distribution ◽  
Concrete Slab ◽  
Structural Response ◽  
The Finite Element Method ◽  
Design Code ◽  
Curved Bridge ◽  
Girder Bridges ◽  
Moment Distribution ◽  
Truck Loading ◽  
The Moment

A parametric study was conducted, using the finite-element method, to study the load distribution characteristics of curved composite I-girder bridges under truck loading. The influence of several geometric parameters on the moment, and deflection distribution factors, as well as warping stresses in straight and curved composite I-girder bridges was examined. For straight bridges, the moment distribution factors were correlated with those specified in the Canadian Highway Bridge Design Code of 2000, CHBDC. Also the magnitudes of warping stresses in the steel bottom flanges were correlated with the specified limits in bridge codes. The results showed that the CHBDC moment distribution factors significantly overestimate the structural response of straight bridges considered in this study. It was also observed that the curvature limitation specified in the CHBDC to treat a curved bridge of low curvature as a straight one underestimate the structural response.

scholarly journals Shear Distribution in Curved Composite Multiple Box Girder Bridges

2021 ◽  
Author(s):  
Walid I.H. Hassan
Keyword(s):  
Design Method ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Horizontally Curved ◽  
Girder Bridges ◽  
Codes Of Practice ◽  
Shear Distribution ◽  
Truck Loading ◽  
Artificial Neural Network Ann ◽  
Load Distribution Factors

Horizontally curved composite box girder bridges are used in interchanges of modern highway systems. This type of structure has created design problems in estimating its live load. North Americans Codes of Practice recommends some analytical methods for design of such curved bridges. However, practical requirements arising during the design process necessitate a simple design method. On the basis of the literature review, such load distribution factors due to CHBDC truck loading are as yet unavailable. An extensive parametric study, using the finite-element modelling, was conducted, in which 225 prototype bridges were analysed to evaluate their shear distribution factors when subjected to CHBDC truck loading conditions. The parameters considered were number of steel boxes, number of lanes, span length, and span-to-radius curvature ratio. Based on the data generated, empirical expressions for shear distribution factors were deduced. An alternative to the developed expressions were introduced using the Artificial Neural Network (ANN) application.

scholarly journals Shear Distribution in Curved Composite Multiple Box Girder Bridges

2021 ◽  
Author(s):  
Walid I.H. Hassan
Keyword(s):  
Design Method ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Horizontally Curved ◽  
Girder Bridges ◽  
Codes Of Practice ◽  
Shear Distribution ◽  
Truck Loading ◽  
Artificial Neural Network Ann ◽  
Load Distribution Factors

Horizontally curved composite box girder bridges are used in interchanges of modern highway systems. This type of structure has created design problems in estimating its live load. North Americans Codes of Practice recommends some analytical methods for design of such curved bridges. However, practical requirements arising during the design process necessitate a simple design method. On the basis of the literature review, such load distribution factors due to CHBDC truck loading are as yet unavailable. An extensive parametric study, using the finite-element modelling, was conducted, in which 225 prototype bridges were analysed to evaluate their shear distribution factors when subjected to CHBDC truck loading conditions. The parameters considered were number of steel boxes, number of lanes, span length, and span-to-radius curvature ratio. Based on the data generated, empirical expressions for shear distribution factors were deduced. An alternative to the developed expressions were introduced using the Artificial Neural Network (ANN) application.

scholarly journals Mobilizable Strength Design for Multibench Retained Excavation

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Gang Zheng ◽  
Fanjun Wang ◽  
Dong-qing Nie ◽  
Yu Diao ◽  
Danyao Yu ◽  
...  
Keyword(s):  
Strain Field ◽  
Design Method ◽  
Design Procedure ◽  
Earth Pressure ◽  
Bending Moment ◽  
Large Area ◽  
Retaining Structures ◽  
Lateral Earth Pressure ◽  
Strength Design ◽  
Earth Pressures

Multibench retaining systems can be used in large area excavations for the purpose of eliminating horizontal struts. However, there is no design method for this retaining system. Based on the mobilizable strength design (MSD) concept, a design procedure for a two-bench retaining system considering the interaction of the first and second retaining structures was proposed and tested. Based on an admissible strain field for a two-bench retained excavation in undrained condition, the shear strain in the superimposed strain and the lateral earth pressure distribution acting on the retaining structures can be determined. Then, the mobilized shear strength corresponding to the strain field could be calculated by the equations of force and moment equilibrium. Further, the crest displacements, earth pressures, and bending moment in a two-bench retained excavation can be calculated. The calculated results using MSD were verified by the finite difference analysis.

scholarly journals Investigation of Load Distribution Factors for Two-Span Continuous Composite Multiple Boxgirder Bridges

2021 ◽  
Author(s):  
Manal Ibrahim
Keyword(s):  
Load Distribution ◽  
Three Dimensional ◽  
Bending Moment ◽  
Box Girders ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Truck Loading ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Bridges formed of concrete deck slab over built-up steel-box girders are frequently used in bridge construction for their economic and structural advantages. Box girder bridges impose structural challenges to get the straining actions for the design of girders. The objective of this study is to determine the load distribution characteristics for continuous composite multiple–box girder bridges under CHBDC truck loading. An extensive parametric study was conducted using the three-dimensional finite element to evaluate the moment and shear distribution factors when bridges subjected to CHBDC truck loading. The parameters considered in this study are the span length, number of lanes and number of boxes. Then, simple empirical formula for the bending moment and shear force were developed for the structural design. Correlation of the developed expressions based on FEA results with available CHBDC and AASHTO-LRFD formula showed that the former allow engineers to design such bridges more economically and reliably.

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