[Curtailment Of Flange Plates Pdf Download
Amancio Mccrae
Hyde Lane Bridge is an early example of the British Rail western steel box girder bridge. It comprises two external and one central box girder supporting two tracks via a cross-girder and steel plate deck. The steel deck plate forms the top flange to the cross-girders and is curtailed towards the cross girder ends. The cross-girders' ends exhibited cracking commencing at the point of the top flange curtailment and continuing through the web. The cracking is unusual as it appears to have been caused by an excessive stress range in compression promoted by the rapid change in section at the point of top flange curtailment. The paper deals with the analysis of the deck, the emergency works and the design and implementation of the remedial works. (A)
The bending moment of simply supported beam under UDL occurs maximum at center of span and reduces gradually towards supports. Since the bending stress is resisted by flange area; therefore, for the effective and economical use of plate, it is necessary to use a smaller flange area towards the supports which is done by curtailment of flange plate.
Unit I a) Types of steel structures, grades of structural steel, various rolled steel sections, relevant IS specifications such as IS:800-2007, IS:808-1989, IS:875 part I to III, SP: 6(1), SP: 6(6), SP 38. IS:4000-1992, codes for welded connections (mention code). Philosophy of limit state design for strength and serviceability, partial safety factor for load and resistance, various design load combinations, classification of cross section such as plastic, compact, semi-compact and slender. b) Tension member : various cross sections such as solid threaded rod, cable and angle sections. Limit strength due to yielding, rupture and block shear. Design of tension member: using single and double angle sections, connections of member with gusset plate by bolts and welds. (Chapters - 1, 2) Unit II a) Buckling classification as per geometry of cross section, buckling curves, design of struts in trusses using single and double angle section, connections of members with gusset plate by bolts and welds. b) Design of axially loaded column using rolled steel section. Design of built-up column, lacing and battening, connection of lacing/battening with main components by bolts and welds. (Chapter - 3) Unit III a) Design of eccentrically loaded column providing uniaxial and biaxial bending (check for section strength only). b) Design of column bases : Design of slab base, gusseted base, and moment resistant base. (axial load and uni-axial bending) (Chapters - 4, 5) Unit IV a) Design of laterally supported beams using single rolled steel section with and without flange plate, curtailment of flange plates, strength in flexure, low and high shear, check for web buckling, web crippling and deflection. b) Design of laterally unsupported beams using single rolled steel section with and without flange plate, curtailment of flange plates, strength in flexure and shear, check for deflection.(Chapter - 6) Unit V a) Secondary and main beam arrangement for floor of a building, design of beam to beam and beam to column connections using bolt / weld. b) Design of welded plate girder: design of cross section, curtailment of flange plates, stiffeners and connections.(Chapter - 7) Unit VI a) Design of gantry girder : Selection of gantry girder, design of cross section, check for moment capacity, buckling resistance, bi-axial bending, deflection at working load and fatigue strength. b) Roof truss : assessment of dead load, live load and wind load, design of purlin, design of members of a truss, detailing of typical joints and supports. (Chapters - 7, 8)
Plate girders are commonly used as main girders for short and medium span bridges. They are fabricated by welding together steel plates to form an I-shape cross-section, unlike hot-rolled I-beams. Plate girders offer more design flexibility than rolled sections as the plates can be optimized for strength and economy. However, their thin plates are more susceptible to various buckling modes which control the design. Buckling considerations of the compression flange, web in shear and bending must be evaluated to determine the plate girder's load capacity.Read less
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ASDIP STEEL is a structural engineering software for design of steel members and connections. ASDIP STEEL software includes the design of beam to column moment connections based on the AISC 360 provisions. Following is an overview of the graphical user interface and the required steps for moment connection design, with annotated screenshots of the software.
In the Geometry tab enter the sizes, dimensions, and all geometric information of the connection. At the top of the page select the moment connection type: either Flange-plated, Welded flange, or End plate. The program will automatically update the graphical interface to reflect the selection.
At the bottom of the page, click on the Column tab to specify the column steel section from the built-in AISC sections database. If there is a similar connection at the other side of the support, then check the corresponding box to specify that the column web needs to be checked for buckling. Connections at floor or roof have different strengths, so it's necessary to specify the top condition. If continuity plates are added, a number of column web limit states are not required to be checked.
Click on the Beam tab to enter the beam dimensions. The beam size can be selected from the AISC sections database as well. Select the shear connection type, either Double angle, or a Shear plate. A tab for the connector will show up depending on the connection type. The angle can be either bolted or welded to the column and to the beam. If bolted, specify the bolt edge distance. Similar information is required for the single-plate.
In the right pane, the At-a-Glance tab show a summary of the results, with the most relevant information, organized by topic. This is useful for a quick identification of any problem in the design. The program shows the moment connection strength, the shear connection strength, the combined loads, and the design checks.
In the Materials tab specify material properties for column, beam, and connector, such as Fy and Fu. In the Bolts tab enter the bolt diameter and material specification. In the Weld tab enter the fillet weld leg size and electrode strength.
The Condensed tab shows a more detailed set of results, organized by topic. This is useful when more information is required, for example the full list of the geometric constraints checks. The program shows the design strength of all the applicable limit states, and it identifies the controlling limit state for both moment and shear connection. Likewise, the program calculates the factored loads per load combination, and it identifies the controlling load combination, as show above.
n the Loads tab you can specify either a single set of pre-combined loads, or a set of nominal load cases to be combined internally. The first option applies when the loads come from another software and they are already combined, for example the beam reaction for 1.2D+1..6L. In this case enter this load as a pre-combined load and the software will use this load without any additional load factor.
Specify the load combinations code, either ASCE 7-05 or 10/16. Select the steel design method philosophy, either ASD or LRFD. The required load information is the vertical load P and bending moment M acting at the end of the beam, as shown below.
The Detailed tab shows full detailed results, step-by-step calculations with exposed formulas and Code references. It includes the detailed calculation of the design strength of every applicable limit state for both moment and shear connection. This is useful for a granular check of the moment connection design and for submittals to approval agencies.
ASDIP STEEL includes the design of moment connections, with multiple options to optimize the design easily. The design of moment connections may be cumbersome and error-prone, with multiple limit states checks. With the friendly user interface the design can be completed and optimized with ASDIP STEEL in minutes.
For engineering background please read the post Shear Connections: Overview of the Design Process. For design examples please see the post Flange-Plated Moment Connection Example Using ASDIP STEEL and the blog post End Plate Moment Connection Example Using ASDIP STEEL. For our collection of blog posts about steel design please visit Structural Steel Design.
Beams: Allowable stresses, design requirements as per IS Code-Design of simple and compound beams-Curtailment of flange plates, Beam to beam connection, check for deflection, shear, buckling, check for bearing, laterally unsupported beams.
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