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FESPA - STRUCTURAL ANALYSIS AND DESIGN SOFTWARE
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General

Fespa 10 is a 3D software for the analysis and design of structures, comprised of linear and surface elements, of different materials and arbitrary cross-sections, subjected to various loading conditions.

As now LH Logismiki continues into its fourth decade of activity, it tackles all new code regulations with the responsibility that its experience guarantees. Firmly oriented towards developing pioneer software products to be used both in Greece and abroad, Fespa 10 ranks among the best software products, offering integrated analysis solutions to be engaged in all kinds of technical projects. Especially with regard to the earthquake analysis and design, Fespa 10 covers an extensive range of benefits contributing to the establishment of a new era in the field of computational analysis under the challenge of continuously evolving design standards.

In few words Fespa 10 is a modern-day product linked to the pursuit of quality production, meeting in full the customers' requirements and expectations. Fespa 10 is being developed through the continuous collaboration of a highly skilled personnel and academic consulting team. Before the release of a new version of Fespa, a wide range of test methods are thoroughly carried out by professionals.

The following pages give you insight into the possibilities of Fespa 10.

Data input


With Fespa the data entry is accomplished by inserting columns and walls at the positions, defined by the grid lines. Slabs are described the same way. The insertions of beams completes the structural model.

In Fespa 10, the structural model is composed of various entities such as beams, columns, slabs, footings, etc. There is no limit of size and shape.

Each entity has its own group of "Properties", which are categorized in appropriate tabs according to their use. For example there are properties

  • for geometrical representation in 2D and 3D,
  • those for structural analysis and design,
  • type and diameter of reinforcement,
  • material selection,
  • earthquake resistance, etc.
All these properties can be interchanged between the elements of the same entity, thus facilitating the modifications procedure.

Each entity also has its own group of "Commands". They are used for inserting and editing entities. In the status bar, constant help guides you through the commands of Fespa 10.


Various loading conditions can be applied to the entities through the relevant tab in the properties window and the special loading commands.

Grid lines and snap points make the accurate geometry description of even the most complicated structural models really simple.

All the given data is automatically transferred in data tables for further assessment and/or quick group changes.


Generating tools facilitate the description of the structural model. Describe one floor and then generate the rest. Generate footings. Generate combinations of actions.

Not only the floor based input is supported but also a free form description is available through the "Edit" tool. Powerful commands make the construction of the complex 3D structure possible. Using this tool domes, barrel vaults, and irregularly shaped models can be described.

Generation of structural models in both the horizontal and vertical plane, by using the "Move" command of the "Edit" tool.

The "multiple choices" command is available and gives the option to choose among nodes or members that have the same position on plan but with different heights

By just clicking on the ? next to each property or by using the F1 key for the commands, the e-manual automatically opens to the respective explanation.

Modelling and data verification


After the completion of the data input, Fespa 10 automatically generates the computational and the loading model. Earthquake loading is automatically generated according to the local design spectrum. Loading combinations are automatically generated and presented in the data tables. The accurate modeling is aided by the use of rigid offsets in 3D, fictitious girders, elements on elastic foundation.

The 3DV tool helps with the data verification. Displays loading diagrams, local coordinates names and lengths of members. It also highlights members with the same structural or design properties e.g. hinged members, X bracings. The proper connection of structural members may be checked.


Such is the structure of Fespa 10 that after the input of the data, the only thing the engineer has to do is to proceed with the "Analysis and design" of the building. This is possible because everything needed for analysis, design and drawings is there from the beginning. There is no need of intermediate steps, interchange of data and results between the various analysis and design modules. The whole procedure is therefore automatic and secure.

Analysis


Fespa 10 offers linear structural and dynamic analysis as well as non linear pushover analysis. All the analysis procedures are performed through a very powerful, fast and accurate solving algorithm. The speed of calculation is phenomenal even for the non linear analysis. The completion time of the non linear analysis for a five storey building, 350 m2 lies within the limits of some seconds.

The solution algorithm is equipped with the current trends of mathematics and engineering. For example complete CQC of modal responses, mass matrix formation with distribution of the mass at the nodes, six degrees of freedom per node, care for rigid diaphragms, automatic calculation of the number of mode shapes for 90% mass sum, automatic check for structural irregularities, works due to axial and shear forces-bending and torsional moments.

After the analysis procedure is finished, the engineer can use the three dimensional wire frame view tool (3DV) to:

  • Display the deformed geometry of the model based on any load, or combinations of loads.
  • View the animated deflections of the model.
  • View the animated various mode shapes of the modal analysis.
  • Display the shear, moment and axial force diagrams.



There is the option of explicitly calculating the overstrength factor au/a1 through pushover analysis. The engineer has the option of assigning values of au/a1 up to 1.5, according to EN 1998-1 and then confirming that value using pushover analysis. After the pushover analysis is finished the Force-Displacement diagram is generated, the value of au/a1 is calculated and both are displayed in 3DV. 3DV gives also the option to animate the development of plastic hinges.

Strengthening and repair of buildings according to EN 1998-3-Pushover analysis


Fespa 10 is equipped with the add on module (Fespa 10R) which performs repair and strengthening of existing reinforced concrete buildings and evaluation of the seismic performance of a new building.

The engineer describes the reinforcement arrangement at beam and column ends of the existing building, using the relative properties and commands. Furthermore, using the appropriate set of commands and properties the user can describe column cross-sections of arbitrary shape and their reinforcement model. The moment-chord rotation diagrams of beams and columns are developed, for the assigned reinforcement arrangements (moment-chord rotation diagrams can also be developed for steel members). After the pushover analysis, the Acceleration Displacement Response Spectrum (ADRS) is generated and displayed in 3DV. The target displacement is calculated for up to three discreet accelerations and limit states. The capacity ratios, for all members, are derived for every limit state.

Static pushover analysis-ADRS


  • Uniform, triangular or modal lateral load patterns.
  • P-? effects are taken into account considering geometric nonlinearity.
  • Accidental eccentricity is considered.
  • The resistance curvature of the structure is developed either by applying a force method of analysis, or a displacement method of analysis.
  • Acceleration Displacement Response Spectrum generated both in three dimensional wire frame view and in the Report.
  • Derivation of the chord rotation angle both at yield and ultimate limit state. Moment-chord rotation diagrams for columns and beams are included in the Report.

Assigning reinforcement model at beam ends


  • The bending and shear reinforcements at beam end can be specified by using the relevant properties.
  • The engineer has the option to characterizethe members either as new members or as existing members and either as primary or secondary seismic members so as their resistances to be calculated according to EN 1998-3.
  • Slip of anchorage of bars.
  • Strengthening by applying concrete jackets or by FRP plating and wrapping.

Assigning reinforcement model at columns


  • Special commands allow for the description of column cross-sections even of arbitrary shape.
  • The reinforcement model of the column cross-section is created by using the appropriate commands and properties.
  • Taking into account the action effects derived from the analysis, the cross-section geometry, the material properties and the reinforcement model:
    • The safety factor against bending is calculated.
    • The moment-chord rotation diagrams, which will be used for the assessment of existing structures using pushover analysis, are calculated.

Design

The design engineer has the ultimate control of the analysis and design procedure.


Fespa 10 is implementing Eurocodes:
  • Eurocode 0
  • Eurocode 2 for the design of concrete structures,
  • Eurocode 3 for the design of steel structures and
  • Eurocode 7 for geotechnical design
  • Eurocode 8 for the earthquake resistance of structures.

By choosing the appropriate National Annex the design engineer has in their hands the best tool for designing structures with adequate resistance to earthquakes, provided in areas of medium or high seismicity (Turkey, Portugal, Spain, countries of Northern Africa, etc).


The following step is the design of all structural members according to the selected standards, the material in use and the results of the analysis.

The design procedure starts automatically after the analysis. After all entities (slabs, columns, footings, beams, etc) have been checked an error record is created and is displayed on screen. Fespa 10 helps the design engineer to locate the members that failed during the analysis and suggests ways of resolving the error that led to the specific failure. An error or warning message appears in the results window and by double clicking on that error or warning, the relevant member (slab, column, beam and footing) is highlighted on the screen.

Concrete


All necessary checks are performed according to Eurocode 2 and Eurocode 8 for every ductility class. Some very important calculations are described hereafter:

Redistribution of moments


Fespa 10 is equipped with the moment redistribution method through which the hogging moments at beam supports are lowered leading to more uniform and economical beam reinforcement and subsequently column reinforcement.

The reduction of the additional reinforcement placed at the supports contributes in a positive way:

  • In satisfying the local ductility requirement
  • In applying the capacity design rule of columns in bending
  • In applying the shear check of joint (DCH)

Ductile walls


Bending moment and shear force checks are performed at every level of a wall with the values that are obtained from the design envelopes which are produced in accordance with EC8-1.
 

Detailing for local ductility


Adequate ductility of beams is ensured by fulfilling the conditions of EN 1998-1 relevant with the maximum permissible reinforcement ratio of the tension zone and the required compression reinforcement.

Serviceability limit state controls

  • Deflection control. For the deflection control of slabs there is the option of following the simplified method or of analytically calculating the deflection.
  • Crack control. For the crack control there is the option of following the simplified method or of analytically calculating the crack width.
  • Stress limitation. Limitation of the compressive and tensile stresses in the concrete and steel respectively is achieved, by using the appropriate arrangement of reinforcements.

Prevention of bond failure-Anchorage of reinforcement

The minimum permissible column size, to prevent bond failure, depends on the diameter of beam longitudinal rebars passing through the beam-column joint. Fespa 10 suggests minimum dimensions of column cross-sections with regard to the ductility class of the structure, the strength class of concrete, and the beam longitudinal bars passing through the beam-column joint.

Secondary seismic members

The design engineer has the option of characterising beams and columns as secondary seismic members. This option gives a way out from satisfying certain requirements of EN 1998-1.

Structural steel


Fespa 10 provides a table with multiple cross-section types (IPE, HEB, HEA, etc) and facilitates the specification of any standard cross-section by providing a list of available dimensions (180, 200, 240, etc.). The engineer also has the option to describe a welded cross-section.

Fespa 10 provides beam types with special structural characteristics (truss members, seismic links with or without eccentricity, purlins, etc) that need to satisfy specific requirements. The properties that control the structural characteristics (hinges, buckling length, length for the calculation of deflections, etc) of those beams as well as the properties that control certain check requirements (lateral torsional buckling) are automatically updated with regard to the selected beam type.

Properties for the elastic hinges at beam ends for both main directions of the cross section.

 

Masonry


The add-on module of Masonry is used for the design of Masonry structures according to EN 1996-1-1. Fespa 10 supports composite structures consisting of masonry, reinforced concrete and steel members. The check of masonry columns subjected to bending is performed according to EN 1996-1-1.

Output presentation - Drawings


During the design procedure reinforcements are displayed on the structural plan. After the end of all calculations structural drawings for each floor are automatically created. At the same time all data is documented in a report which can be opened edited and printed by the "Report" program, provided with Fespa 10.

Report

With the "Report" program, the design engineer can edit the document according to their preferences:

  • The extent of the report can be adjusted, as a variety of filters are offered. Furthermore, the engineer can create their own templates of filter groups.
  • Simultaneous presentation of graphics and text data.
  • Design envelope for shear forces and bending moments in shear walls.
  • Error / Warning messages with explanation based on relevant paragraphs of the Standards and recommended ways of resolving the specific error.
  • Export of tables in tek / csv/ html files so that they can also be used, for example, in the structural drawings.

Bill of quantities

Fespa lists the results of the required reinforcement in clearly arranged tables together with detailed design information. It is possible to edit the reinforcement proposal and to adjust for example the number of rebars, the anchorage, the length of rebar.

 

Drawings

For the editing of drawings multiple colours, line types, line densities and hatches are provided to describe the various members (slabs, beams, columns, footings).

Dimensions may be added and calculated automatically and there are various font texts that can be used for the dimension texts.

Captions, symbols,tags and heights can be easily inserted and modified.

Drawings of structural plan

Beam elevations

After the analysis, by selecting the desired beam, the add-on module "Beam elevations" automatically creates a file with the corresponding beam elevation. Beam elevations include longitudinal rebar size, stirrup size, section marks, walls, columns.

Edit of beam elevation's rebars with the "Rebar in beam elevations" tool.

Column details

After the analysis, Fespa 10 creates a separate file (for each floor) which includes the cross-sections of all columns with their rebars and stirrups.

The design engineer has the option to edit the details (change rebar diameters, the stirrup type, etc) then save and print them.

The editing of rebars and stirrups of column cross-sections is performed by using the "Cross-section rebar" and "Cross-section stirrup" tools of Fespa 10.

Sections

Section drawings of the structure can be automatically created by Fespa 10. The section drawings may be further edited by the engineer using the relevant commands of the "Section" tool.

3D solid view