What Is The Effect Of Creep In Reinforced Concrete Columns?
What Is The Effect Of Creep In Reinforced Concrete Columns?
The effect of creep in reinforced concrete columns is that it causes the columns to permanently deform or bend, resulting in loss of stability and, in severe cases, collapse due to prolonged loading. This is because concrete, unlike steel, does not return to its original shape after the loading is removed.
Creep is affected by temperature, humidity, and the amount of applied stress. It also increases with time and depends on the composition of the concrete. Creep can lead to structural cracking, buckling, and decreased structural integrity of the columns.
In addition, creep decreases the strength of the columns and can reduce their load-bearing capacity. To prevent creep, designers should consider using higher grades of concrete, reducing the applied stress, and adding reinforcement.
Reinforced concrete columns are commonly used to support loads in buildings and other structures. The columns are subjected to an axial compressive load, and the stresses and strains in the longitudinal reinforcement due to creep can be significant.
Creep is the time-dependent deformation of a material that occurs under constant stress. In reinforced concrete, creep occurs when the stress in the concrete decreases while the stress in the reinforcement increases. This can lead to additional compressive stress and strain in the reinforcement.
The amount of creep that occurs depends on the material properties, the magnitude and duration of the stress, and the temperature. Creep can be a significant contributor to the overall deformation of a structure.
Reinforced concrete columns are commonly designed to resist an initial compressive load, and the creep resistance of the reinforcement is not typically considered. However, when a column is subjected to an axial compressive load for a period of time, the additional compressive stress and strain due to creep can be significant.
How Do The Steel Columns Are Connected To The Concrete Foundation?
One of the most prevalent features is column bases. The steel column is joined to a base plate, which is secured to the concrete foundation with some type of holding down assembly.
A column base is a system consisting of a column, a base plate, and a holding down assembly. The holding down assembly consists of two, but more often than not four (or more) holding down bolts (anchors).
These can be cast-in-place or placed after the foundation has been constructed. Cast-in-place bolts may feature a tubular or conical sleeve to allow the top of the bolts to move laterally, allowing the base plate to be correctly identified.
Base plates for cast-in assemblies are often provided with enlarged holes and thick washer plates to allow for column base movement. To prevent pull-out, anchor plates or similar embedded arrangements can be added to the embedded end of the anchor assembly.
Post-installed anchors that are precisely positioned in the hardened concrete can be utilized.
Torque-controlled expansion anchors, under-cut anchors, and bonded anchors are examples of post-installed
How Do You Paint Exterior Columns?
Columns on the exterior of your home may offer a sense of elegance. They provide warmth and texture to your foundation while providing structural stability.
They, like any other outside surface, require routine upkeep. This involves repainting every few years. Column painting is not difficult and is an excellent do-it-yourself job.
Step 1: Construct Scaffolding.
Set up scaffolding if necessary to provide a stable foundation for your work. Scaffolding may be necessary depending on the height of your columns to do this work securely.
It will make your task easier if you have a lot of columns to paint. It is available for rent at most home improvement stores. A robust, strong ladder will suffice for columns that are low and few in number.
Step 2. Scrape Away Old Paint.
Divide your project into thirds: high, medium, and low. Wear a dust mask, gloves, and safety glasses. Using the scraper and putty knife, remove old paint. Tape a paper bag to the column to catch falling paint chips for quick cleanup.
Step 3: Smooth The Surface.
Smooth the finish using sanding blocks and medium-grit sandpaper. Using a utility brush, remove any debris.
Step 4: Fill In The Blanks.
Caulk the spaces between the column and the exterior of your home. To seal the crack, use primer and sand it down into it.
Step 5: Apply A Second Layer Of Primer.
Apply a second layer of primer, this time covering the whole primed area.
Step 6: Finish With The Topcoat.
Apply the topcoat. The topcoat functions as a sealer, ensuring that the job lasts for a long period and does not need to be repeated anytime soon.
Step 7: Reposition The Scaffolding.
Reposition the scaffolding or ladder and begin again, this time working on the next portion of your columns.
Do Concrete Columns Need Footings?
Yes, if you are working on a concrete floor or patio. Footings are required as concrete columns do not have a lower support since it increases the load on the decorative column.
You can also place steel posts under the columns to secure them in place, creating a complete system of support from one side to the other.
To achieve the requisite strength and endurance of these structural parts, proper concreting of reinforced concrete columns, pedestals, and footings is required.
Improper concreting methods may cause corrosion of steel reinforcement owing to pores and fractures in the concrete, and the concrete may not attain its desired strength on setting.
This may potentially result in the failure of columns, pedestals, or footings during the structure’s occupancy.
