Concrete Shear Wall Design in RAM Structural System (Screencast 001)

demonstrate the Concrete Shear Wall Design Module in the RAM Structural System. This module is a new feature in the version 12 release. It performs the design of reinforced concrete shear walls for gravity, wind, and seismic loads for American and British codes. For additional information, please see the related blog post at Be Communities. bit.ly



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Lec-3 Different Methods of Design of Reinforced Concrete Structures

Lecture series on Design of Reinforced Concrete Structures by Prof. N.Dhang, Department of Civil Engineering, IIT Kharagpur. For more details on NPTEL visit nptel.iitm.ac.in



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Concrete Foundation Repair - What You Need to Know to Keep Your Structure Strong

There are a number of instances where a concrete foundation repair is necessary in order to maintain the structural integrity of a building.

These could be a partial collapse of the building, as a result of water intrusion or an earthquake, or damages caused by overloading a structural deck or slab, or a failure of the foundation due to an improper installation.

In any instance where it appears the concrete footings need to be repaired, a detailed evaluation of the problem, followed by repair recommendations from a structural engineer, is the first step.

Most likely, the building or structure exhibited some signs, or there were indications that pointed to a problem with the concrete foundation.

Typical signs could be a sagging roof line, cracks in the plaster or stucco, or the building is unstable under certain loads.

In the worst-case scenario, a building might be red-tagged, and the inhabitants would have to vacate until the building inspector released the building as safe.

Once the structural engineer has generated a set of repair plans, a licensed concrete contractor will be employed to perform the repairs.

The contractor will start by excavating in order to expose the damaged sections of the foundation, and depending on the extent of the repairs, shoring may be needed to support one, or more sections of the building while the repairs are accomplished.

With the shoring in place, the damaged foundations can be removed using a jack hammer, or heavy equipment if necessary.

A typical concrete foundation repair will include embed rebar dowels, that are installed into the adjacent, undamaged concrete using a commercial, two-part epoxy.

Depending on the type of concrete foundation that's in place, it may be necessary to cut the adjacent concrete slab in order to remove the damaged section of foundation.

A smooth saw cut will allow for embed dowels to be installed per the engineer's specifications.

In addition, the repair will require embed dowels at either end of existing foundation.

The next step will be to install forms for the new section of foundation, and install the steel rebar in the footing.

The rebar is either tied or welded to the dowels to form the continuous reinforcing system.

Once the forms and rebar have been inspected, the foundation concrete can be poured in place, and the anchor bolts and structural hold-downs can be located in the fresh concrete.

When the concrete has initially set, the forms can be stripped and the excavation can be hand back-filled.

However, the back-fill cannot be compacted until the concrete has cured to a specified strength.

With many commercial buildings, samples of the concrete are sent to a lab for testing, and the test reports will indicate at what point the concrete foundation will sustain a load.

When the concrete has achieved the specified strength, the back-fill can be compacted, and any walls or other parts of the structure that were removed can be replaced.

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Berkeley Concrete Canoe Presentations at Nationals (2009), Alabama with "Bear Area"

This was UC Berkeley's presentation that received 1st place in Presentations (one of 4 categories) in Alabama on June 12th, 2009. The canoe this year was named, "Bear Area". The Concrete Canoe competition is a competition between schools across the nation in which Civil Engineering students design a canoe based on hydrodynamic properties, perform structural analysis to ensure that the canoe doesn't crack, design the concrete to make it strong enough and light enough so that it floats, and build the canoe to be raced. This year in 2009, the team won 1st Overall at Nationals as well, for the first time since 18 years! content.asce.org Presenter: Danielle Des Champs Q/A: Danielle Des Champs, Will Nguyen, Justin Beutel Animations, Slides, and Videos: David Leung Presentation Template: Elisha Ezersky



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Concrete Foundation Repair Techniques

If a chain is only as strong as its weakest link, so is a structure only as strong as the foundation supporting it. This is the reason why most experts regularly reiterate the need for regularly checking for evidence of structural damage to the foundation. But, what happens after you have found out that you need to have your houses foundation repaired?
C Channels (or Pilasters) are one of the common available foundation repair techniques. This method uses large steel beams that anchor between the floor and the floor joists. Though common and easy to install, this method is the least acceptable method of repair according to the Department of Housing and Urban Development (HUD). With this method you use your house to hold up your walls, instead of your foundation walls to hold up your house.
Another concrete foundation repair method is called a wall pin/stitch. This is used on a concrete block foundation wall that has cracked and/or bowed inward. Holes are drilled into the block to allow access. Next a piece of steel (rebar) is inserted inside of the wall. Finally, the core of the block is filed with concrete. This method will do nothing to move the wall back towards its original position.
There are methods available that provide better stability and a better guarantee than 1 year. JES Wall Anchors and Piering Systems are highly recommended foundation repair techniques. The anchor system offers the ability to stabilize AND pull the wall back towards its original position. The piering systems not only stabilize a sinking foundation, but most times can lift the structure towards its original position.
The press piling method is most commonly used in areas where the soil is soft and clay-rich. When press piling, you would have to make use of a number of precast concrete cylinders. These cylinders are then installed via a hole under the house. Using the weight of the home, these cylinders are then driven underground. Although this technique does not require any waiting time, it is, oftentimes, less likely to be used because there is a greater probability of the cylinders cracking or of the piling getting misaligned.
The last of the foundation repair techniques most commonly used by experts is steel press piling. This method is most commonly used in areas where the soil is dryer, sandy, or has harder soil in between layers of clay. It has two major differences from the other methods mentioned above - thinner pilings and the ability to be driven deeper into the ground.
The recommended first step for proper concrete foundation repair is to have a certified foundation repair contractor or engineer examine the foundation to determine how severe the damage is, or if any exists at all. Obtaining a professional opinion on the causes and available solutions is a necessary step in securing your foundation walls. Never gamble with the stability and security of your home. Foundations in need of repair require immediate attention to avoid further structural damage and increased costs to the homeowner.

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