👉What Do You Think The Cause Of The Failure

@etconp

👉The failure of the concrete staircase is primarily caused by 
improper or insufficient steel reinforcement and poor structural design and execution at the connection point with the upper floor slab. 

🚧Details of the Failure

💫Lack of Proper Anchorag:

⏺The image and associated information indicate a critical mistake where the main reinforcement bars of the staircase were not properly anchored into the landing beam or slab above with adequate development length or proper bends (hooks). Instead, they appear to have been cut short or installed incorrectly.

💫Missing or Incorrect Negative Reinforcement:

⏺The diagrams in the image highlight the need for "top" or negative reinforcement bars extending from the top of the stair into the upper slab to handle the tension forces that occur at this connection point when the stair is loaded.
This was likely omitted or installed incorrectly in the failed structure.

💫Structural Weakness:

⏺A staircase is a major structural element that carries significant loads.
⏺Without correct and continuous reinforcement into the supporting structure, the connection point becomes a weak link, leading to a bond failure and collapse as seen in the image.

💫Substandard Workmanship:

⏺This type of failure often results from trying to cut costs, using unqualified labor, or failing to follow approved engineering drawings and building codes. 

@etconp

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● Concrete Admixtures
● Bonding Agents
● Waterproofings
● Wall Putty, Prime Coat
● Concrete Repair Mortar
● Floor hardener, Epoxy
● Grout, Self-level mortar
● Quartz paint, Contextra
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● Geotextiles and other construction chemicals and materials

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Dinberwa Hospital

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Dani Plaza

👉The main components of a staircase include the treads (the horizontal steps), risers (the vertical boards between steps), stringers (the side supports), handrails and balusters (the safety railing and vertical posts), and landings (the flat platforms for rest or direction changes).

🎲The main parts can be grouped into the steps, the structural supports, and the safety features. 

🚧Step components

⏺Tread: The flat, horizontal part of the step where you place your foot.
⏺Riser: The vertical section between two treads that sets the height of the step.
⏺Nosing: The front edge of the tread that extends slightly over the riser.
⏺Curtail Step: An ornamental step at the very bottom of a staircase, often with a rounded end. 

🚧Structural components

⏺Stringer: The inclined board or panel that runs along the side or center of the stairs, supporting the treads and risers.
⏺Newel Post: A larger, sturdy post located at the beginning, end, or bends of a staircase that supports the handrail.
⏺Landing: A wide, flat platform at the top or bottom of a flight of stairs or between flights, used for rest or to change direction. 

⭐️Safety and finishing components

⏺Handrail: A long bar, typically attached to a wall or supported by newel posts and balusters, that provides support for users.
⏺Baluster: The vertical posts or spindles that are placed between the handrail and the tread or base rail to prevent falls and fill the gap in the balustrade.
⏺Balustrade: The entire system of handrail, balusters, and base rail that runs along the open side of the stairs.
⏺Newel Cap: The ornamental top piece of a newel post. 

@etconp

👉Different Types of Stresses in Materials

💫1. Tensile Stress

⏺Stress that tends to stretch a material, caused by axial pulling force.

💫2. Compressive Stress

⏺Stress that compresses or shortens a material, caused by axial pushing force.

💫3. Shear Stress

⏺Stress that acts parallel to the surface, causing layers to slide against each other.

💫4. Bending Stress

⏺Stress developed when a beam is subjected to bending moment, causing tension
on one side and compression on the other.

💫5. Torsional Stress

⏺Stress induced when a material is twisted by torque, producing shear stress along
its cross-section.

💫6. Thermal Stress

⏺Stress developed due to expansion or contraction from temperature changes when
deformation is restrained.

💫7. Bearing Stress

⏺Contact stress between two bodies, e.g., bolt pressing against a hole surface.

@etconp

👉What is a Column? (General Explanation)

📌A column is a vertical member and one of the most important structural elements in a building.
Its functions are:

📌To carry loads coming from the slab, beam, and upper floors

📌To transfer those loads down to the footing

📌To contribute to the stability and strength of the structure

🚧Materials Used to Make Columns

1️⃣ Reinforced Concrete Column (RCC)
Made from concrete + rebar (steel bars)
This is the most commonly used type in buildings.

2️⃣ Steel Column
Made from steel sections.
Used in high-rise buildings and industrial structures.

3️⃣ Timber/Wood Column
Made from wood and seen in traditional houses.

📐 Main Functions of a Column

📌Load carrying: It carries the loads from the structure above.

📌Transfer of load: It transfers the load directly to the foundation.

📌Stability: It prevents the building from collapsing or bending.

📌Supports beams & slabs: Beams rest on top of the column.

🧩 Parts of a Column

1. Longitudinal bars – The long steel bars inside the column.

2. Stirrups/Ties – The circular/closed bars that hold the longitudinal bars in place.

3. Concrete cover – The protective concrete surrounding the steel.

4. Footing connection – The point where the column is connected to the foundation.

🏗️ Where Are Columns Used?

📌Multi-storey buildings

📌Commercial buildings

📌Bridges (piers)

📌Warehouses

📌Churchs, Mosques, schools, offices, etc.

📚 Simple Example

🔗If the beam is like the arms, and the slab is the top surface,
the column is the legs of the building.

🔗If the legs become weak, the whole structure can collapse.

@etconp