Structural Crack Treatment Of Concrete Columns

Structural Crack Treatment Of Concrete Beams(1)

Structural Crack Treatment Of Concrete Beams(2)

Structural Crack Treatment Of Concrete Slabs

The different stress conditions of the column can cause different forms of cracks. The geometric characteristics of columns are similar to those of beams, but their stress situations are significantly different: columns mainly bear vertical pressure, and when the structure is subjected to load eccentricity, horizontal force, or uneven settlement, they also bear bending moments and shear forces.

When the main force on the structure is pressure, axial compression components and small eccentric compression components are prone to longitudinal compressive cracking of concrete in the vertical direction, which may cause damage to the concrete structure. Reinforcement treatment should be carried out as soon as possible. The compressive cracks caused by the bending of steel bars in the transition zone of variable cross-section columns, as well as the crushing cracks in the concrete at the column base caused by substandard construction quality, are also signs of structural danger and should be detected and reinforced in a timely manner.

The column is subjected to eccentric compression, and the cracks caused by bending moment will appear in the Lamian Noodles of the eccentric compression column, and the cracks will be perpendicular to the column, similar to the bending cracks. Under horizontal loads, large eccentric horizontal tensile cracks may occur in corner columns. Due to construction joints and concrete sinking, horizontal cracking along the perimeter of the steel hoop can also occur. Uneven settlement of the foundation causes the column to tilt, and bending cracks can also occur at the column corners and heads.

When the column is subjected to significant horizontal loads or forced displacements, diagonal cracks may also occur due to shear forces. This type of diagonal crack can cause damage to the concrete structure under repeated horizontal loads, and should be reinforced in a timely manner.

One or both sides of the column

Horizontal crack non penetrating section

Bending tensile cracks

What is the cause of the crack?

Eccentrically compressed components

Under the action of axial force and bending moment

Lower tensile cracking

What are the impacts?

Insecurity

Affects visibility

It basically does not affect the bearing capacity

Affects durability

How to deal with cracks?

Sealing cracks

Reinforcement treatment if necessary

On the side of the corner column along the perimeter of the column

Horizontal cracks along the perimeter of the column

Stress cracks caused by axial or minor eccentric tension

What is the cause of the crack?

Under horizontal load, one side of the column experiences tensile cracking across its entire cross-section

What are the impacts?

Insecurity

Affects visibility

It basically does not affect the bearing capacity

Affects durability

How to deal with cracks?

Sealing cracks

Reinforcement treatment if necessary

Joint on the side of the column

Cracks along the joint, concrete with texture differences

Construction joint cracks

What is the cause of the crack?

Cleaning and chiseling of the rubbing surface

Insufficient moisture

Improper construction pouring, vibration and maintenance

What are the impacts?

Insecurity

Affects visibility

It basically does not affect the bearing capacity

Affects durability

How to deal with cracks?

Covering cracks

Reinforcement treatment if necessary

Vertical cracks on the column side

Intermittent groups of short cracks, bulging and peeling off

Compression failure crack

What is the cause of the crack?

Concrete reaches strength under compression

Improper construction pouring, vibration and maintenance

What are the impacts?

Warning signs of crushing failure

Indicating insufficient column bearing capacity

How to deal with cracks?

Immediately stop using and uninstall

Timely detection and reinforcement treatment

Sides of variable cross-section columns

Vertical cracks in variable cross-section areas

Local cracks caused by poor construction

What is the cause of the crack?

Large slope of variable cross-section

Insufficient column hoop reinforcement

Bending of diagonal column steel bars

What are the impacts?

Affects local bearing capacity

Affects durability

How to deal with cracks?

Sealing cracks

Local reinforcement treatment

Diagonal crack towards one side area

Parallel cracks with short water and parallel reinforcement at oblique cracks

Diagonal cracks under shear force

What is the cause of the crack?

Insufficient reinforcement

Longitudinal bars undergo shear cracks along the steel bars under the action of shear force

What are the impacts?

Insufficient local shear resistance

Affects durability

How to deal with cracks?

Sealing cracks

Local reinforcement treatment

Column upper and lower areas

Diagonal cracks do not penetrate the cross-section

Diagonal cracks under shear force

What is the cause of the crack?

Insufficient coupling

Shear cracking caused by horizontal load or forced displacement

Insufficient shear bearing capacity

What are the impacts?

Affects durability

Affects local bearing capacity

Appearance impact

How to deal with cracks?

Sealing cracks

Local reinforcement treatment