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Tie bars are provided in cement concrete pavements at
expansion joints
contraction joints
warping joints
longitudinal joints
longitudinal joints
Tie bars are deformed steel bars used in rigid pavements to hold adjacent concrete slabs together at longitudinal joints. Unlike dowel bars, which facilitate load transfer, tie bars are designed to prevent the widening of joints and ensure the slabs remain in intimate contact.
Tie bars are deformed steel bars used in rigid pavements to hold adjacent concrete slabs together at longitudinal joints. Unlike dowel bars, which facilitate load transfer, tie bars are designed to prevent the widening of joints and ensure the slabs remain in intimate contact.
AtтАЛ=SsтАЛbтЛЕfтЛЕWтАЛ тАФ area of steel required per meter length of joint
LtтАЛ=2тЛЕsbтАЛSsтАЛтЛЕdтАЛ тАФ length of tie bar required for bond development
The primary function of a tie bar is to counteract the lateral forces that cause longitudinal cracking or slab separation. By providing a mechanical bond between adjacent lanes or slabs, they prevent the longitudinal joint from opening due to moisture variation, subgrade shrinkage, or traffic-induced tensile stresses. They do not allow for movement like expansion or contraction joints; rather, they act as tension members to keep the joint tight.
Tie bars are bonded to the concrete, unlike dowel bars which are generally lubricated to allow sliding.
Commonly used in longitudinal joints between lanes in highways.
They are made of deformed steel (usually HYSD bars) to increase anchorage.
Total force to be resisted is calculated based on the weight of the slab moving away from the centerline.
Prevents separation of lanes
Maintains structural integrity of the pavement
Simple construction and installation
Cannot accommodate thermal movement
Requires proper corrosion protection if exposed to salt/moisture
Must be accurately aligned to be effective
Longitudinal joints of rigid highway pavements
Connecting airfield concrete slabs
Dowel bars are used in expansion and contraction joints to transfer loads while allowing movement.
Tie bars are NOT used in expansion joints because they would restrict the essential thermal expansion movement.
The required length of tie bar LtтАЛ is determined by the bond strength sbтАЛ of concrete.
D is correct тАФ Tie bars are specifically installed in longitudinal joints to bind adjacent concrete slabs and prevent lateral separation.
Always remember: Dowels are for LOAD TRANSFER (movement allowed), Tie bars are for JOINT INTEGRITY (no movement allowed).