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CivilTransportation Engineering
PrevNext

Tie bars are provided in cement concrete pavements at

A

expansion joints

B

contraction joints

C

warping joints

D

longitudinal joints

Correct Answer

тЪЩя╕П TE тАв Technical Concept & PrincipleCivilTransportation Engineering
Option D

longitudinal joints

Quick Summary:

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.

тЪЩя╕ПTETechnical SolutionConcept & Principle
ЁЯТб Explanation

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.

ЁЯФв Key Formulas

At=bтЛЕfтЛЕWSsA_t = \frac{b \cdot f \cdot W}{S_s}AtтАЛ=SsтАЛbтЛЕfтЛЕWтАЛ тАФ area of steel required per meter length of joint

Lt=SsтЛЕd2тЛЕsbL_t = \frac{S_s \cdot d}{2 \cdot s_b}LtтАЛ=2тЛЕsbтАЛSsтАЛтЛЕdтАЛ тАФ length of tie bar required for bond development

тЪЩя╕П Working Principle

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.

ЁЯУМ Key Points
  • тЦ╕

    Tie bars are bonded to the concrete, unlike dowel bars which are generally lubricated to allow sliding.

  • тЦ╕

    Commonly used in longitudinal joints between lanes in highways.

  • тЦ╕

    They are made of deformed steel (usually HYSD bars) to increase anchorage.

  • тЦ╕

    Total force to be resisted is calculated based on the weight of the slab moving away from the centerline.

тЬЕ Advantages
  • тЦ╕

    Prevents separation of lanes

  • тЦ╕

    Maintains structural integrity of the pavement

  • тЦ╕

    Simple construction and installation

тЭМ Disadvantages / Limitations
  • тЦ╕

    Cannot accommodate thermal movement

  • тЦ╕

    Requires proper corrosion protection if exposed to salt/moisture

  • тЦ╕

    Must be accurately aligned to be effective

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Longitudinal joints of rigid highway pavements

  • тЦ╕

    Connecting airfield concrete slabs

ЁЯУД Additional Information
  • тЦ╕

    Dowel bars are used in expansion and contraction joints to transfer loads while allowing movement.

  • тЦ╕

    Tie bars are NOT used in expansion joints because they would restrict the essential thermal expansion movement.

  • тЦ╕

    The required length of tie bar LtL_tLtтАЛ is determined by the bond strength sbs_bsbтАЛ of concrete.

ЁЯУК Diagram / Illustration
Tie Bar FunctionalitySlab ASlab BLongitudinal Joint with Tie Bar
тЬЕ

D is correct тАФ Tie bars are specifically installed in longitudinal joints to bind adjacent concrete slabs and prevent lateral separation.

Core Concepts Used
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Rigid Pavement Design Joint Types in Concrete Roads Steel Reinforcement in Pavements
ЁЯТб EXAM TIP

Always remember: Dowels are for LOAD TRANSFER (movement allowed), Tie bars are for JOINT INTEGRITY (no movement allowed).

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