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Title |
Splice Strengths of Noncontact Lap Splices Using Strut-and-Tie Model
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Keywords |
스트럿-타이 모델 ; 비접촉 겹침 이음 ; 부착 강도 ; 겹침 이음 길이 |
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Abstract |
Strut-and-tie models for noncontact lap splices are presented and parameters affecting the effective lap length (lp) and the splice strength are discussed in this paper. The effective lap length along which bond stress is developed is shorter than the whole lap length. The effective lap length depends on the transverse reinforcement ratio (Φ) and the ratio of spacing to lap length (α). As the splice-bar spacing becomes wider, the effective lap length decreases and, therefore, the splice strength decreases. The influence of the ratio α on the effective lap length becomes more effective when the transverse reinforcement ratio is low. Because the slope of the strut developed between splice-bars becomes steeper as the ratio Φ becomes lower, the splice-bar spacing significantly affects the effective lap length. The proposed strut-and-tie models for noncontact lap splices are capable of considering material and geometric properties and, hence, providing the optimal design for detailing of reinforcements. The proposed strut-andtie model can explain the experimental results including cracking patterns and the influence of transverse reinforcements on thesplice strength reported in the literature. From the comparison with the test results of 25 specimens, the model can predict the splice strengths with 11.1% of coefficient of variation.
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