Distance Between Expansion Joints In Concrete Retaining Walls

For soldier pile and soldier pile tieback walls with concrete fascia panels expansion joint spacing should be 24 to 32 feet on centers.

Distance between expansion joints in concrete retaining walls.

This type of joint is used in concrete or concrete masonry to impart a plane of weakness. Say the calculated distance between the joints is 7 meters and the distance between columns is 7 meters then a calculated risk is taken by placing them at 7 meters. National concrete masonry association segmental retaining walls sales jump 3 in 2016. Tial basement walls and the national ready mixed concrete association ref.

Expansion joints are provided in every large structure which is subjected to high variation in temperature during its lifetime. Joint may be grooved sawed or formed. In a concrete structure. Also known as control joint kosmatka wilson 2016 expansion joint.

Generally the spacing of the control joint is specified for a minimum of 20 feet 609 6 cm in the center. O reclamation a. A concrete masonry wall may crack as it shrinks over time. 4 recommends a contraction joint spacing of 30 times the wall thickness or 20 feet for an 8 inch thick wall 30 8 240 inches 20 feet.

Difference between control and expansion joints. The friction of the concrete is the key factor that limits the movement. Expansion joints are not permitted in footings except at bridge abutments and where the substructure type changes such as locations where spread footing to pile footing occurs. This temperature variation causes expansion and contraction in the structure.

The hight shear force is applied at the horizontal construction joints located at the lower level. Where control joints are provided in such a wall they widen as the concrete masonry shrinks preventing it from cracking. Some designers recommend re ducing joint spacings by about 20 in walls with frequent openings such as doors and windows.