Spacing Of Expansion Joints In Concrete Retaining Walls
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Table 1 2 expansion joint spacings.
Spacing of expansion joints in concrete retaining walls. An engineered method is presented in tek 10 3 control joints for concrete masonry walls alternative engineered method which is based on limiting crack width to 0 02 in. 2 wall height spacing 8 feet or less 3 times wall height. The engineered method is generally used only when unusual. Joint spacing in meters.
Joint spacing in feet contraction joints may be tooled into the concrete surface at the time of placement. 0 51 mm since water repellent coatings can effectively resist water penetration for cracks of this size. The hight shear force is applied at the horizontal construction joints located at the lower level. Joints in poured walls by kim basham and bruce suprenant effective methods for controlling unsightly wall cracking f i g u r e 1.
Expansion joints should normally be provided at a spacing of not more than 30m between successive expansion joints or between the end of the structure and the next expansion joint. For cantilevered and gravity walls vertical expansion joint spacing shall be a maximum of 60 feet on centers. These are vertical or horizontal joints that are used between two successive pours of concrete keys are used to increase the shear resistance at the joint. There is a special check to be done at the construction joints when larger retaining walls or structures having very high lateral loads are designed.
Author spacing lewerenz 1907 75 ft 23 m for walls. Precast concrete cantilever wall expansion joints shall be in accordance with the standard specifications section 6 11 3 3. Joint spacing varies with amount and grade of shrink age and temperature reinforcement. In reinforced walls and 6m in unreinforced walls.
Consideration for the location of movement joints should be given at. Aci 224r 92 one to three times the height of the wall in solid walls. Joints are commonly spaced at distances equal to 24 to 30 times the slab thickness. Hunter 1953 80 ft 25 m for walls and insulated roofs 30 to 40 ft 9 to 12 m for.
Change in wall height or thickness see figure 1 figure 2 change of loading see figure 3 abutments of walls and columns see figure 4 junctions of dissimiliar materials see figure 5 movement joints in concrete floor slabs see figure 6. The friction of the concrete is the key factor that limits the movement. Use projecting strips to reduce wall thickness by at least one fourth ref. Recommended spacing of vertical contraction joints modified from ref.
In concrete walls the movement joints should normally be placed at a maximum spacing of 7 5m.
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