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Waterproofing work in basement shear wall. YOTA Construction
23/10/2024

Waterproofing work in basement shear wall.
YOTA Construction

13/10/2024

Another earthquake occurred in Awash Fentale areas

Today october 13, 2024 at 7:37 am Awash Fentale direction 8.828°N 40.141°E on Richter scale M 4.6 - 17 km S of Awash, Ethiopia, the depth of 10.00 km (6.21 mi) indicated that it occurred again.

It has been reported that tremors were felt in Addis Ababa where the earthquake occurred. According to the Director General of Ethiopian Geological Institute, Ijara Tesfaye, the incident is not similar to what happened last week.

Stirrups (sttafa) are used in concrete beams as shear reinforcement. Since shear manifests itself in a concrete beam by ...
13/10/2024

Stirrups (sttafa) are used in concrete beams as shear reinforcement. Since shear manifests itself in a concrete beam by diagonal cracking near the supports, the optimum shear reinforcement would be orientated at 45 degrees from the vertical to be in tension across those potential cracks. It’s usually easier and simpler to orient the stirrups vertically and increase the area of the stirrups to account for that.

In a typical uniformly loaded concrete beam, the shear force is maximum at the supports and nearly zero at the center. For economy, the spacing of the stirrups will be maximum near midspan and can be quite close together near the supports. In the “good old days”, engineers would draw beam elevations to indicate top and bottom bar sizes, lap locations, and stirrup size and spacing.

The purpose of ties in a column is quite different. While column ties do increase the shear capacity of the column, their main use is to confine the longitudinal main bars and the concrete core of the column against bursting and collapse during severe overload situations, like earthquakes. In seismic zones, the spacing of ties for confinement is reduced as you near the beam/column joint similar to beam stirrups.

According to the American Concrete Institute (ACI) Code, beams and columns are designed exactly the same! It actually makes sense, since most concrete beams and columns have some frame action and are thus subject to both flexure and axial loads. There are a couple of unique column- and beam- specific requirements, but basically the members are treated the same and the capacity is determined through the use of an interaction diagram.
YOTA Construction

Cracks on a concrete slab can occur due to various reasons. Here are some common causes:1. Shrinkage: Concrete shrinks a...
10/10/2024

Cracks on a concrete slab can occur due to various reasons. Here are some common causes:

1. Shrinkage: Concrete shrinks as it cures, leading to cracks.
2. Settlement: Soil settlement or uneven foundation can cause cracks.
3. Thermal expansion: Concrete expands and contracts with temperature changes, causing cracks.
4. Poor construction: Inadequate preparation, mixing, or finishing can lead to cracks.
5. Weak subbase: A weak or unstable subbase can cause cracks.
6. Overloading: Excessive weight or pressure can cause cracks.
7. Weathering: Exposure to weather, especially freeze-thaw cycles, can cause cracks.
8. Chemical damage: Exposure to chemicals, like salt or acid, can damage concrete.
9. Poor drainage: Water accumulation can cause erosion and cracks.
10. Soil movement: Soil movement or erosion beneath the slab can cause cracks.
11. Tree roots: Tree roots growing beneath the slab can cause cracks.
12. Poor curing: Inadequate curing can lead to weak concrete and cracks.

It's important to address the underlying cause to prevent further damage and ensure effective repair.
YOTA Construction

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