Impact of Near-Fault Ground Motions on Longitudinal Seismic Response of CHRF Bridges

Zheng, Yongrui; Wang, Jin; Xu, Weibing; Li, Nana; Zhang, Wenxue; Chen, Yanjiang

doi:10.3390/su14063591

Cited by 3 publications

(5 citation statements)

References 29 publications

(31 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the pounding, the bending moment of the pier bottom of the CRFB-FSP reduced, which was related to the pounding limiting the dynamic response of the MB to a certain extent. For example, under the NLP excitation, the peak bending moment of the pier bottom of the CRFB-FSP was reduced by 9.9% (no pounding: 53.4 kNm; pounding: 48.1 kNm), as similarly observed by Zheng [8]. Furthermore, the reduction rate under the NFPT excitation was relatively large compared to that under the NLP excitation.…”

Section: Bending Moment Curvaturesupporting

confidence: 67%

“…OpenSees has the advantages of efficient and practical algorithms, high modeling and calculation efficiency, and excellent programmability [36,37]. It is widely used in finite element analysis for seismic performance of structures [8][9][10], which is recommended by the Network for Earthquake Engineering Simulation (NEES) and the Pacific Earthquake Engineering Research Center (PEER). Accordingly, the nonlinear finite element models (FEMs) of the prototype bridges were established by OpenSees.…”

Section: Finite Element Model (Fem)mentioning

confidence: 99%

“…The simplified Hertz-Damp model was used to simulate the pounding, and the calculation of the relevant parameters of the model can be found in the literature [5,8]. The model parameters used in this study were calculated as follows: K t1 was 2.42 × 10 8 N/mm, K t2 was 5.44 × 10 7 N/mm, and δ y was 2 mm.…”

Section: Finite Element Model (Fem)mentioning

confidence: 99%

“…The results showed that the longitudinal displacement and rotation angle increased with the increase in the skew angle. Zheng et al [8], explored the pounding response law of curved bridges under near-fault ground motions based on an OpenSees platform. The results showed that the shear force of the bridge piers increased after considering the pounding.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Research on the Pounding Response and Pounding Effect of a Continuous Rigid-Frame Bridge with Fabricated Super-High Piers Connected by Grouting Sleeves

Wang

Huang

et al. 2022

Sustainability

Self Cite

View full text Add to dashboard Cite

The dynamic characteristics of a continuous rigid-frame bridge with fabricated super-high piers (CRFB-FSP) connected by grouting sleeves and adjacent continuous beam bridges (AB) are significantly different, and they are prone to pounding under earthquake excitation. At present, the pounding response between the CRFB-FSP and AB is still unclear, and the impact of the pounding on the seismic performance of a CRFB-FSP is still in the exploratory stage. In this study, two 1/20 scaled models of a CRFB-FSP (MB) and a cast-in-place AB were designed and manufactured. Then, according to the research purpose and the output performance of the shaking table, three each of non-long-period (NLP) ground motions and near-fault pulse-type (NFPT) ground motions were selected as the inputs of the excitation shaking table test. The peak ground acceleration (PGA) changes from 0.5 g to 1.5 g. According to the similarity ratio (1/20), the initial gap between the MB and AB was taken as 7 mm (prototype design: 140 mm). Furthermore, the longitudinal pounding response between the CFRB-FSP and AB, as well as its influence on the seismic performance of the CFRB-FSP, was systematically investigated through a shaking table test and finite element analysis (FEA). The results showed that the pounding with the CRFB-FSP easily caused a persistent pounding, which may increase the damage risk of the pier. The peak pounding force under the NFPT ground motion was more significant than under the NLP ground motion, whereas the pounding number under the NFPT ground motion was smaller. The peak pounding force increased with the increase in the initial gap, pounding stiffness, span, and pier height. With and without pounding, the CRFB-FSP reflected higher-order mode participation (HMP) characteristics. After pounding, under the NFPT excitation, the HMP contribution increased significantly compared with that of the without pounding condition, while this effect under the NLP excitation was smaller. The peak displacement of the main beam of the CRFB-FSP increased with the increase in the main beam span, pier height and initial gap. The peak bending moment of the pier bottom increased with the increase in the main beam span and initial gap, however, decreased with the increase in the pier height. Moreover, the peak displacement of the main beam and the peak moment of the pier bottom of the CRFB-FSP both reduced. In contrast, the corresponding seismic response of the AB increased under the same conditions.

show abstract

Section: Bending Moment Curvaturesupporting

confidence: 67%

Section: Finite Element Model (Fem)mentioning

confidence: 99%

Section: Finite Element Model (Fem)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on the Pounding Response and Pounding Effect of a Continuous Rigid-Frame Bridge with Fabricated Super-High Piers Connected by Grouting Sleeves

Wang

Huang

et al. 2022

Sustainability

Self Cite

View full text Add to dashboard Cite

show abstract

“…With the construction of railways and expressways in western mountainous areas of China, bridge structures have been developing in the direction of high piers and long spans [1][2][3]. Chinese relevant codes have not yet given a clear definition of super-high piers.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response of the Continuous Rigid-Framed Bridge with Super-High Piers Based on Shaking Table Tests

Yan,

Zhao,

Cao

et al. 2024

Buildings

View full text Add to dashboard Cite

Continuous rigid-framed bridges with super-high piers (CRFB-HP) have been widely applied in mountain areas. However, their seismic performance is still urgently to be clarified. In this study, the refined finite element model (FEM) of a CRFB-HP was constructed and verified according to the shaking table test results of its scaled model. On this basis, systematic elastic‒plastic time history analysis of the CRFB-HP was conducted to investigate the influence of parameters on their seismic performance, including main bridge span, pier height and number of tie beams. The results show that CRFB-HP have the characteristic of long vibration periods and are more sensitive to long-period ground motions. Along the longitudinal and transverse directions, the peak pier top displacement and pier bottom bending moment of CRFB-HP are both relatively large under NLPL (+20%~+70%) and NFPT (TP ≈ T1, +50%~+120%) excitations. For the same span, the peak pier top displacement increases with the pier height increasing, while the peak pier bottom bending moment decreases with the pier height increasingFor the same pier height, the peak pier top displacement and peak pier bottom bending moment both increase with the span length increasing. Moreover, the pier height change has a greater effect on the pier top displacement than that of the span change. CRFB-HP show obvious high-order response participation (HRP) under different ground motions. The NFPT (TP ≈ T1,) ground motions can significantly increase HRP. Moreover, compared with cast-in-place CRFB-HP, the HRP of a fabricated super-high pier is greater (+20%~+30%). The peak pier top displacement and pier bottom bending moment both decrease with the increase in the number of tie beams. The reasonable arrangement of tie beams can improve the lateral seismic performance of CRFB-HP. However, compared to the cast-in-place CRFB-HP, the peak pier top displacement is larger, and the peak pier bottom bending moment is smaller, for the fabricated CRFB-HP.

show abstract

Modal parameter identification and seismic assessment of historical timber structures under near-fault and far-fault ground motions

2023

View full text Add to dashboard Cite

Impact of Near-Fault Ground Motions on Longitudinal Seismic Response of CHRF Bridges

Cited by 3 publications

References 29 publications

Research on the Pounding Response and Pounding Effect of a Continuous Rigid-Frame Bridge with Fabricated Super-High Piers Connected by Grouting Sleeves

Research on the Pounding Response and Pounding Effect of a Continuous Rigid-Frame Bridge with Fabricated Super-High Piers Connected by Grouting Sleeves

Seismic Response of the Continuous Rigid-Framed Bridge with Super-High Piers Based on Shaking Table Tests

Modal parameter identification and seismic assessment of historical timber structures under near-fault and far-fault ground motions

Contact Info

Product

Resources

About