Hewes Billington Palermo Pampanin mm 180 mm 1240 mm mm 240 mm 7. 5 C40 10 mm HRB3

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1 30 4 JOURNAL OF VIBRATION AND SHOCK Vol. 30 No P U A Pseudo static test for pre-cast segmental bridge columns with dry joints GAO Jing 1 GE Ji-ping 2 LIN Tie-liang 3 1. Dept. of Civil Engineering Xiamen University Xiamen China 2. School of Urban Construction and Safety Engineering Shanghai Institute of Technology Shanghai China 3. Highway Bridge & Tunnel Maintainence Center in Xiamen Xiamen China Abstract The similarities and differences of a seismic performance between a pre - cast segmental bridge column and a cast-in-place bridge column were investigated with a test project including five kinds of concrete bridge columns. Prestressed tendon construction methods arrangement and bonded state of prestressed tendons and additional energydissipating bar were selected as test variables. Through the pseudo static test of the five kinds of concrete bridge columns the development rules of failure mode failure area load-displacement hysteretic loops opening of segmental joints residual displacement distribution of curvature energy dissipation ability and viscous damping ratio were gained. The experimental results showed that the segmental column experiences opening-closing between segmental interfaces under cyclic loading the change of curvature focuse on the area of the segmental interfaces the segmental bridge column has no plastic hinge mechanism at the bottom of the column as commonly seen in conventional reinforced concrete bridge columns the addition of energy dissipating bars crossing the joint can delay the gap opening increase the strength and the hysteretic energy dissipation of the column it certainly helps anti-earthquake the residual displacement of the segmental bridge column with bonded or unbonded prestressed tendons is less and the segmental bridge column with energydissipating bars has bigger residual displacement it is close to that of a cast-in-place bridge column. Key words pre-cast segment dry joints pseudo static test energy-dissipating bar aseismic performance YYY Mander Hewes Priestley 5

2 Hewes Billington Palermo Pampanin mm 180 mm 1240 mm mm 240 mm 7. 5 C40 10 mm HRB335 6 mm R mm 1 50 mm 80 mm 10 mm 1 50 mm mm Φ j kn 11. 2% 10% 1 Fig. 1 The dimension of specimens and section reinforcement details

3 / 3 ± 2 mm 3 mm 5 mm 7 mm 10 mm Hz ± 5 mm ± 10 mm ± 20 mm ± 30 mm ± 40 mm ± 50 mm ± 60 mm ± 70 mm ± 80 mm ± 90 mm ± 95mm 3 80% 1 Tab. 1 Serial Numbers and main characters of all specimens RC UBPC UBPC-S UBPC-SD BPC-S 15 mm Hz 20 mm 25 mm 30 mm 5 mm 1 / Fig. 3 Damage state of precast segmental bridge column RC UBPC UBPC-SD UBPC-S BPC-S Fig. 2 Damage state of cast-in-place bridge column 4 b c

4 UBPC-S UBPC UB- UBPC-S UBPC-S PC-S UBPC 60% UBPC-S UBPC-S UB- PC UBPC 4 - Fig. 4 Load-displacement hysteretic loops BPC-S RC 2 Tab. 2 The key points of load and displacement /kn /kn /mm /kn /mm RC UBPC - S UBPC UBPC - S UBPC - SD UBPC - SD UBPC - S BPC - S UBPC - SD UBPC

5 Fig. 5 Envelope curve of loaddisplacement hysteretic loops Fig. 6 Relationship of displacement and dissipating energy Fig. 7 Residual displacement vs. loading displacement 2. 5 X RC UBPC 1 UBPC - SD 7 RC UBPC 25 mm 5 mm UBPC - S UBPC - SD BPC - S 25 mm UBPC - S BPC - S 95 mm 15 mm 8 Fig. 8 Distribution of curvature in the plastic hinge area

6 UB- PC-S BPC-S 9 UBPC-SD UBPC - S 3 9 Fig. 9 Joint opening displacement at critical loading displacement Department of Transportation Mander J B Cheng C T. Seismic resistance of bridge piers based on damage avoidance design R. New York National Center for Earthquake Engineering Research State University of New York at Buffalo Hewes J T. Seismic design and performance of precast 2 concrete segmental bridge columns D. California University of California San Diego C. A Chou C C Chen Y C. Cyclic tests of post-tensioned precast Earthquake Engineering and Structural Dynamics Billington S L Yoon J K. Cyclic response of unbonded posttensioned precast columns with ductile fiber reinforced 4 RC UBPC UBPC-SD concrete J. Journal of Bridge Engineering ASCE Ou Y C Chiewanichakorn M. Seismic performance of UBPC-S BPC-S segmental precast unbonded postensioned concrete bridge columns J. Journal of Structural Engineering ASCE Wang J C Ou Y C Chang K C et al. Large-scale seismic tests of tall concrete bridge columns with precast segmental prestressed concrete segmental bridges M. New York John Wiley &Sons Hieber D G Wacker J M. State-of-the-art report on precast concrete systems for rapid construction of bridges R. Washington Washington State Transportation Commission CFT segmental bridge columns with unbonded strands J. construction J. Earthquake Engineering and Structural Dynamics Palemermo A Pampanin S Marriott D. Design modeling D and experimental response of seismic resistant bridge piers 2 Podolny W Muller J M. Construction and design of with posttensioned dissipating connections J. Journal of Structural Engineering ASCE

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