Investigation of the seismic performance of precast segmental tall bridge columns

Due to the fast construction and low interference, precast segmental bridge columns have gained increasing attention for use in non-seismic regions. However, their applications in seismic areas remain scarce due to their ambiguous dynamic performance. To estimate the seismic performance of PSBCs, existing quasi-static cyclic tests and shaking table tests are gathered and reviewed in this study. According to the structural details and material property at the joints, the PSBCs are categorized as 11 types based on the connection type, namely grouted splice sleeve couplers (GSSCs), grouted corrugated duct connections (GCDCs), wet joint connections (WJCs), mechanical bar splice connections, socket connections (SCs), unbonded post-tensioned tendon connections (UPTCs), partial precast columns (PPCs), hybrid connections (HCs), high-strength steel bars (HSBs), high-performance concrete (HPC), and external dissipators (EXDs). Based on the experimental results, the failure reason of each connection types are discussed and the effective structural details are suggested. And also, the PSBCs are divided into those with ductile and resilient connections according to the damage levels, residual drift ratios, displacement ductility coefficients, equivalent viscous damping ratios and effective stiffness parameters. With the achievements in this research, the application of PSBCs is expected to be promoted in medium-to-high seismic regions.

Section: Existing Experimental Investigations Of Precast Segmental Br...mentioning

confidence: 88%

Review of experimental investigations on seismic performance of precast segmental bridge columns in seismic regions

Zhu

et al. 2023

“…Herein the effects of the unbond prestress on the axial behavior of the proposed TPSBC were evaluated. Specimens TP3 and TP6 with a label of P0 had no initial prestress applied to the columns, while all other specimens had the prestress about 10% of the simple superposed bearing capacity of the tested specimens (Bu et al, 2012; Cai et al, 2021). The detailed prestress ( P 0 ) applied to each specimen is listed in Table 1.…”

Section: Experimental Programmentioning

confidence: 99%

Axial behavior of precast segmental hollow bridge columns confined by grouted steel tubes

Zhou

et al. 2022

To avoid the problems of the conventional precast segmental bridge columns (PSBCs) such as the concrete crushing at column ends, joint openings between segments, and torsional deformation under seismic attacks, a novel type of precast segmental bridge column confined by a grouted steel tube (TPSBC) was proposed, and herein the axial compressive behavior of the TPSBCs was investigated by testing of 14 specimens. The main parameters of the tested specimens included the diameter-thickness ratios of the steel tubes, the number of the precast segments, reinforcement arrangements in the precast hollow segments, initial prestress levels, sandwich concrete strengths, and loading forms. The effects of the parameters on the failure modes, loading bearing capacity, ductility, and steel strain development of the specimens were evaluated. The test results indicate that the proposed TPSBCs with proper configurations exhibited desirable compressive behavior with significantly improved load bearing capacity and deformability compared with the PSBCs. Based on the analysis of the confinement effects, analytical models were developed for predicting the axial bearing capacity of the TPSBCs under the different loading forms.

“…One of the main reasons for this situation is that there are very few numerical simulation methods which can efficiently predict the hysteretic responses of PSBCs. Valuable cyclic analyses were carried out by Bu et al (2012), Kwan and Billington (2003), and Kim et al (2015), respectively. Whereas in these three FE analyses, the opening–closure behavior of the segment joints, which has a significant influence on the behavior of the PSBCs, was not explicitly simulated, Ou et al (2007) proposed a detailed three-dimensional (3D) micro-FE model for ED bar reinforced PSBCs using the general-purpose FE software, ABAQUS.…”

Section: Introductionmentioning

confidence: 99%

“…The models were loaded with only one cycle of lateral displacement. The reason might be the case owing to time-consuming building and running of 3D micro-FE models, as pointed out by Bu et al (2012).…”

Section: Introductionmentioning

confidence: 99%

“…The test results showed that the PSBCs demonstrated ductile behavior, high hysteretic ED capacity, and lateral strength after the use of ED bars. Bu et al (2012Bu et al ( , 2016 reported numerical and experimental investigations on ED bar reinforced PSBCs. The results indicated that the seismic performance of ED bar reinforced PSBC was superior to that of the counterpart without ED bars and was even comparable to that of the CIP reference column.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influencing factors of residual drifts of precast segmental bridge columns with energy dissipation bars

Cai

Zhou

Wang

2018

The energy dissipation bar has been proven to be an effective way to improve the lateral strength and the seismic capacity of the precast segmental bridge column. To date, however, investigations on how the main design parameters affect the residual drift of such bridge columns are quite limited. Focusing on this research gap, a novel numerical simulation method was proposed in this article to investigate the influencing factors of residual drift of precast segmental bridge columns with energy dissipation bars. First, the refined fiber element model was developed based on the OpenSees software package, considering the bond slip phenomenon at the column end and the boundary condition at the interface between the two adjacent segments. Then, the proposed numerical model was validated by comparing the simulated hysteretic behavior of the precast segmental bridge columns with available experimental data. After that, cyclic analyses were performed on 288 precast segmental bridge column models with different design parameters. Four important influencing factors were investigated, including the post-tensioning force, gravity load, energy dissipation bar ratio, and shear span ratio. According to the analysis results, some suggestions were provided for the practical design procedure of the energy dissipation bar reinforced precast segmental bridge columns.