Friday, April 28, 2017

List of Civil Engineering Companies in the world

This list compiles the top civil engineering companies in the world. This list of major civil engineering companies includes the largest and most profitable civil engineering businesses, corporations, and agencies, all of which have had huge impacts on how modern cities and towns function.
What are the biggest civil engineering companies in the world? What are the most successful civil engineering companies? Scroll down for all the civil engineering answers you need.
  1. AECOM Technology Corporation
  2. American Bridge Company
  3. Arcadis NV
  4. Balfour Beatty
  5. Bayside Engineering, Inc.
  6. Bilfinger
  7. Brookfield Multiplex
  8. Carillion
  9. Chemtech
  10. Chico
  11. China Harbour Engineering
  12. Costain Group
  13. Creighton Manning Engineering
  14. Davis Langdon
  15. Enterprise plc
  16. Fomento de Construcciones y Contratas
  17. Fuller, Mossbarger, Scott & May Engineers
  18. Gourlay Brothers
  19. Halcrow Group
  20. Harland and Wolff
  21. HDR, Inc.
  22. Implenia
  23. Salini Impregilo
  24. Interserve
  25. Jacobs Engineering Group
  26. KB2 Consulting Civil and Structural Engineers LLP
  27. Kier Group
  28. Laing O'Rourke
  29. Leighton Holdings
  30. Mesta
  31. Morgan Est
  32. Morgan Sindall Group
  33. Odebrecht
  34. Parsons Brinckerhoff
  35. Philippine National Construction Corporation
  36. Platipus Anchors
  37. RHL Design Group, Inc.
  38. Royal BAM Group
  39. Sacyr Vallehermoso
  40. Sadbhav Engineering Limited
  41. Sir William Arrol & Co.
  42. Strabag
  43. Takuyo
  44. Tutor-Saliba Corporation
  45. United States Army Corps of Engineers
  46. URS Corporation
  47. VINCI
  48. Vollmer Associates LLP
  49. Waring Brothers
  50. Wrought Iron Bridge Company

Thursday, April 27, 2017

StaadPro editor command for concrete member property

The following example shows the required input:
1 3 TO 7 9 PRISM YD 18. ZD 12. IZ 2916 IY 1296
11 13 PR YD 12.
14 TO 16 PRIS YD 24. ZD 48. YB 18. ZB 12.
17 TO 19 PR YD 24. ZD 18. ZB 12.

In the above input, the first set of members are rectangular (18 inch depth and 12 inch width) and the second set of members, with only depth and no width provided, will be assumed to be circular with 12 inch diameter. Note that no area (AX) is provided for these members.
The third and the fourth set of members in the above example represent a Tshape and a TRAPEZOIDAL shape respectively. Depending on the properties (YD, ZD, YB, ZB, etc.) provided, the program will determine whether the section is rectangular, trapezoidal or T-shaped and the BEAM design will be done accordingly.

Wednesday, April 26, 2017

How do i define Prismatic Properties in Staad?

The following prismatic properties are required for analysis:
  • AX = Cross sectional area
  • IX = Torsional constant
  • IY = Moment of inertia about y-axis.
  • IZ = Moment of inertia about z-axis.
In addition, the user may choose to specify the following properties:
  • AY = Effective shear area for shear force parallel to local y-axis.
  • AZ = Effective shear area for shear force parallel to local z-axis.
  • YD = Depth of section parallel to local y-axis.
  • ZD = Depth of section parallel to local z-axis.
For T-beams, YD, ZD, YB & ZB must be specified. These terms, which are shown
in the next figure are:
  • YD = Total depth of section (top fiber of flange to bottom fiber of web)
  • ZD = Width of flange
  • YB = Depth of stem
  • ZB = Width of stem
Prismatic property nomenclature for a T and Trapezoidal section
Prismatic property nomenclature for a T and Trapezoidal section

For Trapezoidal beams, YD, ZD & ZB must be specified. These terms, which too
are shown in the next figure are:
  • YD = Total depth of section
  • ZD = Width of section at top fiber
  • ZB = Width of section at bottom fiber
Top & bottom are defined as positive side of the local Z axis, and negative side of
the local Z axis respectively.
STAAD automatically considers the additional deflection of members due to pure
shear (in addition to deflection due to ordinary bending theory). To ignore the
shear deflection, enter a SET SHEAR command before the joint coordinates. This
will bring results close to textbook results.
The depths in the two major directions (YD and ZD) are used in the program to
calculate the section moduli. These are needed only to calculate member stresses
or to perform concrete design. You can omit the YD & ZD values if stresses or
design of these members are of no interest.
To define a concrete member,you must not provide AX, but instead, provide YD
and ZD for a rectangular section and just YD for a circular section. If no moment
of inertia or shear areas are provided, the program will automatically calculate
these from YD and ZD.
Required Section Properties
Required Section Properties

Table is offered to assist the user in specifying the necessary section values. It
lists, by structural type, the required section properties for any analysis. For the
PLANE or FLOOR type analyses, the choice of the required moment of inertia
depends upon the beta angle. If BETA equals zero, the required property is IZ.

How do I change a cover to a reinforcement for beams and columns in STAAD.Pro V8i?

Got to Commands- Concrete Design- Design parameters-Clear
Cover to reinforcement

Wednesday, April 05, 2017

Core Cutting In Reinforced Cement Concrete Structures

Cores are generally cut with the use of a rotary cutting tool having diamond bits. In this way, a cylindrical specimen is acquired normally with its ends to be unequal, parallel and square and occasionally with embedded pieces of reinforcement.
Core cutting is performed for the following reasons :-
  • To detect firmness and density of concrete
  • To find out depth of carbonation of concrete
  • Chemical analysis
  • Water/gas conformity
  • Petrographic analysis
  • ASHTO Chloride permeability test

Bent Tower for NYC: World’s Longest Skyscraper

New York City’s obsession with building ultra-tall, skinny skyscrapers should come as a surprise to no one. For decades, architects and developers have worked to “out-phallic” each other to seize prestige and obscene amounts of cash. New York-based Oiio Studio has had enough of the taller-is-better trend – and they’re now aiming to create the “longest skyscraper in the world” – aptly dubbed “The Big Bend” – to draw attention to the city’s absurd real estate situation. The proposed Big Bend aims to be the longest skyscraper on the globe – topping out even Dubai’s Burj Khalifa – by folding
the tower in half in an inverted U-shape.

Big Bend is a 4,000-foot-tall paperclip-shaped skyscraper that would loom over the towers along New York City’s Billionaire’s Row. The plans evoke an ultra-modern atmosphere with images of top-hatted rich men taking center stage in the renderings. According to the architects, the “bendy” design responds to the city’s uber-tall skyscrapers, which have been criticized for “bending” building codes and using their height to command exorbitant prices.

How to Specify member properties graphically in Staadpro?

  • To define member properties, click on the Property Page icon located on the top toolbar.

Alternatively, one may go to the General | Property page from the left side of the screen as shown below.

  • In either case, the Properties dialog box comes up (see figure below). The property type we wish to create is the W shape from the AISC table. This is available under the Section Database button in the Properties dialog box as shown below. So, let us click on the Section Database button.

    For beam and column properties in Rcc structure you have to click on Define button next to Section Database.

    • In the Section Profile Tables dialog box that comes up, select W Shape under the American option. Notice that the Material box is checked. Let us keep it that way because it will enable us to subsequently assign the material constants E, Density, Poisson, etc. along with the cross-section since we want to assign the default values.
      Choose W12X35 as the beam size, and ST as the section type. Then, click on the Add button as shown in the figure below.
    For beam and column properties in Rcc structure after clicking on Define button next to Section Database you get dialog box as shown below. Click on Rectangle for rectangular properties.

    Saturday, April 01, 2017

    How do I change the sizes of reinforcement bars for beams and columns in STAAD.Pro V8i?

    Go to Commands - Design - Concrete Design
    concrete design command staadpro
    Concrete design command

    On right side small window appear, Under current code select your code
    Select code

    Click on Define Parameters- in left panel click on MD1 & MD2