Design various types of reinforced concrete members with RCM ACI-Builder Software

RCM ACI-Builder Software is a simple tool for structural engineers to design several types of reinforced concrete members with adhering to ACI318M-11 code.

This useful structural engineering software can produce comprehensive design output report involving complete formulas and explanatory figures. This construction program can easily resolve practical issues associated with design. Besides, it can be applied for educational purpose as it facilitates the engineers to gather thorough knowledge on ACI code.

RCM ACI-Builder Software contains the following items:

A. Design of flexural members (Rectangular and T-Shape Sections):

A.1-Ascertain section characteristic under balance case, singly reinforced section & doubly reinforced section.

A.2-Estimate area of steel in accordance with applied moment.

A.3-Estimate moment as per alloted area of steel.

B. Design of Shear under following cases:

B.1- Members based on shear and flexure only.

B.2- Members based on shear and axial compression.

B.3- Members based on shear and significant axial tension.

C. Design of combined shear and torsion under both cases of compatibility and equilibrium torsion.

D. Design of punching for prestressed and non-prestressed members with all column geometry cases: interior, edge & corner columns.

E. Manage current and enduring deflection for beams and slabs.

F. Design of corbels and brackets.

Link for download Design various types of reinforced concrete members with RCM ACI-Builder Software

G. Deal with flexural cracking in beams and one-way slabs.

H. Design of pile-caps with most general geometry cases: 2,3,4,5 & Strip-Pile Caps.

I. Design of isolated footings under eccentrically and concentrically case of loading.'

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Published By

Rajib Dey

www.constructioncost.co

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Detailed Process for effective slab reinforcement

This construction video will highlight the detailed process for complicated slab reinforcement. All steel bars are connected following the design details. Here the concrete ratio is 1:2:4. This video is very useful for Civil Engineering students as well as various structural engineering professionals.

The slabs containing ratio of longer length to its shorter length (Ly/Lx) larger than 2 is known as one way slab or else as two way slab. In one way slab main reinforcement is equivalent to shorter direction and the reinforcement equivalent to longer direction is defined as distribution steel. In two way slab main reinforcement is rendered alongside both direction.

Detailing Requirements of RCC Slab as per IS456: 2000

a) Nominal Cover:

For Mild exposure – 20 mm

For Moderate exposure – 30 mm

However, if the diameter of bar is less than 12 mm, or cover may be decreased to 5 mm. Therefore for core reinforcement up to 12 mm diameter bar and for mild exposure, the nominal cover will be 15 mm.

b) Minimum reinforcement: The reinforcement in either direction in slab must not be lower than

• 0.15% concerning the total cross sectional area for Fe-250 steel

• 0.12% concerning the total cross-sectional area for Fe-415 & Fe-500 steel.

c) Spacing of bars: The utmost spacing of bars must not surpass

• Main Steel – 3d or 300 mm whichever is lesser.

• Distribution steel –5d or 450 mm whichever is lesser Where, ‘d’ denotes the operative depth of slab. Note: The least clear spacing of bars must not be lower than 75 mm (Preferably 100 mm) even if code does not suggest any value.

d) Maximum diameter of bar: The maximum diameter of bar in slab, must not surpass D/8, where D denotes the total thickness of slab.

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Published By

Rajib Dey

www.quantity-takeoff.com

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Brief overview of Pin-jointed Truss and different Analysis methods

Truss belongs to a structure that contains straight members to build up one or more triangular units. Generally Pin-joints are used to tie the members of truss at the end. The joints concerning a truss are defined as nodes. External forces and reactions can only function at the nodes and produce forces in the members to be axial forces (tensile or compressive).

If all the members and nodes are positioned inside a two dimensional plane, it is called plane truss. If a truss consists of members and nodes and expands into three dimensions, it is called space truss.

Trusses are inherent parts of various structures like bridges, roof supports, transmission towers, space stations etc.

Truss are defined as:-

a) Statically establish; all the unidentified forces (support reaction and member forces) can be specified with the use of equations of static equilibrium. (provided m+r = 2j).

b) Indeterminate; equations of static equilibrium can’t solely find out unknown forces, provided m+r> 2j.

c) Unstable; not appropriate to bear load; provided m+r < 2j; Where ‘m’ denotes member’s no in a truss; ‘r’ denotes number of reaction components; And ‘j’ denotes number of joints in a truss;

Analysis methods:

Two methods are available for determining the forces in the members concerning a truss;

(i) Methods of Joints : This method focuses on the equilibrium of the all joints concerning the truss. There exists two equations of static equilibrium ?Fx & ?Fy.So one has to start with the joint containing lower than 2 unknown forces. Go through problem 3-1 (civilengineer.webinfolist.com)

(ii) This method is useful while finding out the forces in a few members. Under this method, a fictitious is passed over the members in which forced should be set and to obtain unidentified forces, select the equilibrium of the left hand side or the right hand side of the truss.Go through problem 3-2 (civilengineer.webinfolist.com)

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Published By

Rajib Dey

www.quantity-takeoff.com

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The Fluor legacy codes are very useful for construction estimator

In my experience, the best convention for cost codes are numeric. The Fluor legacy codes are the most comprehensive and flexible because of the order of the prime / sub-prime / detail / cost type. The entire cost code including the cost type is contained in 6 characters as follows:

• 101001
• 1= Prime (Concrete)
• 10= Sub-Prime (Concrete / General Account)
• 10-100= Prime / Sub-Prime with 3 digit Detail (Concrete / General Account / Testing)

To elaborate, the prime supports the natural order of construction as follows:

Direct Accounts

• 0 account - Site @ Civil
• 1 account - Concrete
• 2 account - Structural
• 3 account - Architectural
• 4 account - Mechanical
• 5 account - Piping
• 6 account - Electrical
• 7 account - Instrumentation
• 8 account - Painting, Tracing, Insulation (Other Directs)

Indirect Accounts

9 account - All Indirect costs

Further to the First character, the sub-prime breaks down the prime into a further 10 sub-primes. In the case of an account like electrical, you can establish meaningful commodity based categories at the sub-prime level as follows.

• 60 = Electrical General
• 61 = Major Electrical Equipment
• 63 = Power and control Cable
• so on and so on...
• 10-100- 1- Prime / Sub-Prime with 3 digit Detail & Cost Type (Concrete / General Account / Testing / Labour)
• Personally, I have used the Fluor legacy codes throughout my entire career across a variety of industries ad projects of all sizes. They truly are a set of codes that could be adopted by the AACE or the CII as a best practice coding convention !!!
• I am happy to answer any questions on applying these codes at any phase of a project.

 

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Published By

Rajib Dey

www.quantity-takeoff.com

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