Article
Engineering, Civil
Jian Yu, Wangbao Zhou, Lizhong Jiang
Summary: This study focuses on the analysis of post-seismic residual track irregularity and post-seismic train speed threshold in earthquake-prone areas of the Chinese high-speed railway network construction. The research constructed a time-domain signal for post-seismic residual track irregularity based on the Gaussian pulse translation theory and established response spectra applicable to stochastic structures. The results show that residual alignment irregularity has a large amplitude under transverse seismic actions.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2023)
Article
Thermodynamics
Bin Yan, Hexin Fu, Rui Gan, Gaoxiang Zhang, Haoran Xie
Summary: This study establishes a nonlinear dynamic simulation model to analyze the seismic response characteristics of a high-speed railway suspension bridge-tracks system under multi-dimensional seismic waves. The effects of design parameters such as initial temperature load mode and viscous damper on the system's response are discussed.
ADVANCES IN MECHANICAL ENGINEERING
(2022)
Article
Engineering, Civil
Jian Yu, Wangbao Zhou, Lizhong Jiang, Wen Yan, Xiang Liu
Summary: In this paper, three-dimensional coupling models of track-bridge systems for high-speed railways, with and without trains, were developed and verified using shaking table tests. The study also discussed the equivalent method of designing seismic track irregularities for random structures and proposed amplitude response spectra for different levels of seismic intensity. Based on engineering case analysis, the rationality of the design seismic track irregularity was evaluated, providing a theoretical foundation for post-earthquake contingency plans for high-speed railways. The results showed that increasing the span number led to an increase in the design seismic track irregularity amplitude, which eventually stabilized. When the span number reached 9, the train dynamic response also became stable. Additionally, it was found that the design seismic track irregularity had a reasonable safety margin and was feasible in engineering practice.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2023)
Article
Engineering, Geological
Wangbao Zhou, Lingzhi Zu, Lizhong Jiang, Jian Yu, Yongjian Zuo, Kang Peng
Summary: Track irregularities are important for the safety and lifespan of high-speed railway track structures. Damping has a significant impact on the seismic response and the influence of damping on seismic-induced track geometric irregularities is of interest. This study focuses on a simple-supported beam bridge of the CRTS-II ballastless track high-speed railway. A power spectral density curve spectrum of seismic-induced track geometric irregularity was established based on guarantee rate, and the influence of structural damping ratio on the power spectral density curve was analyzed. The findings show that seismic-induced track irregularities worsen with decreasing damping and increasing peak ground acceleration, and more spikes and high-frequency periodic components are observed in the power spectral density curve.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
Zheng Wang, Lizhong Jiang, Liqiang Jiang, Wangbao Zhou, Yanliang Du
Summary: This study investigates the seismic response of the High-Speed Railway Track-Bridge System (HSRTBS) under original and amplitude scaling ground motion using 53 stations from the Taiwan Chichi earthquake. The results show that the seismic response of the HSRTBS is influenced by factors such as fault angle and rupture distance.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Geological
Wei Guo, Yitao Ye, Yao Hu
Summary: This paper investigates the seismic damage of CRTS III slab ballastless track system and reveals that it provides inferior longitudinal restraint to bridge structures compared to CRTS II ballastless track system. The fasteners are found susceptible to seismic damage, and the inconsistent vibration of unequal height piers is the main cause of track structure damage. Based on the seismic damage analysis, a simplified seismic model is proposed for computational attractiveness.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Mechanical
Han Zhao, Biao Wei, Lizhong Jiang, Ping Xiang, Xuebing Zhang, Hongkai Ma, Shipeng Xu, Li Wang, Han Wu, Xiaonan Xie
Summary: With the rapid expansion of the high-speed railway network, the safety of high-speed trains running over bridges has become increasingly important worldwide. Previously, the spectral intensity was proposed as a performance-based index for discussing train running safety over high-speed railway bridges in seismic design. However, the speed independence of the conventional spectral intensity index greatly limits its applicability in earthquake scenarios. In this study, a velocity-related spectral intensity index is proposed for the first time to address this limitation and its correlation with train running speed is illustrated. Scale model experiments and probability analysis are conducted to validate the feasibility and discuss the randomness and economy of high-speed railway bridges. Systematic parametric analyses based on the train-bridge coupled model further demonstrate the threat of vibration induced by train speed on train running safety under earthquakes, which was previously ignored in seismic design.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Civil
Biao Wei, Binqi Xiao, Zhangliang Hu, Lizhong Jiang, Shanshan Li
Summary: In order to ensure the running safety of high-speed trains, this paper analyzes the damage control of the components in the high-speed railway bridge-track system (HSRBTS) under the combined design of friction pendulum bearing and metal damping tenon. The results show that the combined seismic isolation design can control the damage of track interlayer components and reduce the sensitivity of damage response to ground motion characteristics. The proposed damage control index, maximum damage overrun length (LDmax), quantifies the damage degree of track interlayer continuous components and achieves fine damage control.
Article
Engineering, Geological
Jian Yu, Wangbao Zhou, Lizhong Jiang, Kang Peng, Lingzhi Zu
Summary: Previous studies have conflicting conclusions regarding the train effect on the lateral structural vibration of track-bridge system. This paper conducted a shaking table test with a running train model to verify the train hitting and damping effects and evaluate the impact of train operation on structural vibration. The results show that the hitting effect on track structure vibration is considerable but limited on the bridge structure, and the damping effect is not significant for both. The aseismic design of high-speed railway track-bridge system can ignore the train if the bridge structure response is used as the major evaluation index.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Construction & Building Technology
Hongye Gou, Rui Xie, Chang Liu, Wei Guo, Bing Han, Yi Bao
Summary: This study proposes a theoretical model to clarify the influence mechanism of track defects on the track irregularity of high-speed railway bridges under pier settlement, including void under slab, interlayer debonding, and fastener fracture. The elongation coefficient of track deformation is used to describe the mapping characteristics of interlayer parameters to track geometric under additional bridge deformation. The fundamental mechanisms of track deformation are elucidated, laying a theoretical basis for further study of infrastructure long-term evolution.
STEEL AND COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Tianxing Wen, Lizhong Jiang, Liqiang Jiang, Wangbao Zhou, Yanliang Du
Summary: A novel interlayer damage model is proposed to assess the seismic performance of the track subsystem in a high-speed railway bridge-track system. The model accurately describes the distribution and size of interlayer area damage regions along the entire track subsystem, providing important information for evaluating structural demand and train running safety.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Biao Wei, Wei-Hao Wang, Peng Wang, Tian-Han Yang, Li-Zhong Jiang, Teng Wang
Summary: The seismic vulnerability of high-speed railway bridges may be inaccurately estimated when the track structure is oversimplified in a finite element model. An evaluation of the track constraint's effect on various bridge components and the overall system's seismic vulnerability was conducted, and the track structure itself was found to require seismic risk assessment.
JOURNAL OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Wei Guo, Zian Xu, Yitao Ye
Summary: This study investigates the seismic response and damage mechanism of the bridge-CRTS III slab ballastless track system under transverse earthquakes. The results show that the piers have good seismic performance, but the fixed bearing is vulnerable. The sliding of the girder exacerbates the non-uniform displacements, which may impact the safety of train operation.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Civil
Lingzhi Zu, Wangbao Zhou, Lizhong Jiang, Jian Yu, Yongjian Zuo, Shaohui Liu, Donghang Peng
Summary: This study investigates the time-frequency characteristics of seismic-induced track irregularity on high-speed railways and provides a method for constructing a sample database based on randomness. The results indicate that track irregularity is mainly caused by alignment irregularity and the time-frequency spectrum does not contain significant high-frequency components. Additionally, wavelet transform is more effective in reconstructing post-earthquake track geometric irregularity.
Article
Metallurgy & Metallurgical Engineering
Jian Yu, Li-zhong Jiang, Wang-bao Zhou, Xiang Liu
Summary: Railway transportation plays a crucial role in earthquake mitigation and post-earthquake reconstruction. This research focuses on track irregularities caused by earthquakes and proposes a target seismic residual track irregularity based on the distribution mode analysis, along with calculating the driving speed threshold after earthquakes. The findings indicate that transverse earthquakes lead to noticeable alignment irregularities in rails, with smaller amplitudes in vertical irregularities. The distribution mode of alignment irregularities can be categorized into unimodal and bimodal, with the latter showing significantly smaller amplitudes and vehicle responses. It is found that when the peak acceleration of transverse earthquakes is less than 0.25g, no deceleration is needed, while a moderate deceleration is required when it exceeds 0.25g to ensure comfort.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Engineering, Civil
Renbing An, Jiacong Yuan, Yi Pan, Duhang Yi
Summary: Traditional timber structures built on sloped land are more susceptible to seismic damage compared to structures built on flat land. The upper portion of the structure is found to be the weak point on sloped land, with potential issues such as tenon failure and column foot sliding.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Elyas Bayat, Federica Tubino
Summary: The current design guidelines for assessing floor vibration performance do not consider the influence of variability in the walking path on the dynamic response of floors. This study investigates the dynamic response of floors under a single pedestrian walking load, taking into account the randomness of the walking path and load. The effectiveness of the current guidelines in predicting floor response is critically assessed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Gao Ma, Chunxu Hou, Hyeon-Jong Hwang, Linghui Chen, Zhenhao Zhang
Summary: Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. This study proposed a repairable column with UHPC segments and replaceable energy dissipaters. The test results showed that the columns with UHPC segments and replaceable dissipaters exhibited high strength, deformation capacity, and energy dissipation.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Kartheek S. M. Sonti, Pavan Kumar Penumakala, Suresh Kumar Reddy Narala, S. Vincent
Summary: In this study, the compressive behavior of alumina hollow particles reinforced aluminum matrix syntactic foams (AMSF) was investigated using analytical, numerical, and experimental methods. The results showed that the FE solver ABAQUS could accurately predict the elastic and elastio-plastic behavior of AMSFs. The study also suggested that FE models have great potential in developing new materials and composites under compression loading.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Zheqi Peng, Xin Wang, Zhishen Wu
Summary: In this study, the statistical modeling of fiber-reinforced polymer (FRP) cables using the classic fiber bundle model is explored. The study considers important features of large-scale multi-tendon FRP cables, such as initial random slack and uneven tensile deformation among tendons. A parametric study and reliability analysis are conducted to predict the load-displacement relation and design thousand-meter-scale FRP cables. The study emphasizes the relation between the reliability index beta of the cable and the safety factor gamma of the FRP material.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Yanchao Shi, Shaozeng Liu, Ye Hu, Zhong-Xian Li, Yang Ding
Summary: This paper introduces a damage assessment method for reinforced concrete (RC) columns under blast loading, using modal parameter measurement as the evaluation index. The validity of the proposed method is validated through numerical and experimental analysis. The results show that this modal-based damage assessment method is applicable for non-destructive evaluation of blast-induced damage of RC columns.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Xiaolin Zou, Maosheng Gong, Zhanxuan Zuo, Qifang Liu
Summary: This paper proposes an efficient framework for assessing the collapse capacity of structures in earthquake engineering. The framework is based on an accurate equivalent single-degree-of-freedom (ESDOF) system, calibrated by a meta-heuristic optimization method. The proposed framework has been validated through case studies, confirming its accuracy and efficiency.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jie Hu, Weiping Wen, Chenyu Zhang, Changhai Zhai, Shunshun Pei, Zhenghui Wang
Summary: A deep learning-based rapid peak seismic response prediction model is proposed for the most common two-story and three-span subway stations. The model predicts the peak seismic responses of subway stations using a data-driven approach and limited information, achieving good predictive performance and generalization ability, and demonstrating significantly higher computational efficiency compared to numerical simulation methods.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jin Ho Lee, Jeong-Rae Cho
Summary: A simplified model is proposed to estimate the earthquake responses of a rectangular liquid storage tank considering the fluid-structure interactions. The complex three-dimensional structural behavior of the tank is represented by a combination of fundamental modes of a rectangular-ring-shaped frame structure and a cantilever beam. The system's governing equation is derived, and earthquake responses such as deflection, hydrodynamic pressure, base shear, and overturning moment are obtained from the solution.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
W. J. Lewis, J. M. Russell, T. Q. Li
Summary: The work discusses the key features and advantages of optimal 2-pin arches shaped by statistically prevalent load and constant axial stress. It extends the design space of symmetric arches to cover asymmetric forms and provides minimum values of constant stress for form-finding of such arches made of different materials. The analysis shows that constant stress arches exhibit minimal stress response and have potential implications for sustainability and durability of future infrastructure.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Wen-ming Zhang, Han-xu Zou, Jia-qi Chang, Tian-cheng Liu
Summary: Saddle position is crucial in the construction and control of suspension bridges. This study proposes an analytical approach to estimate the saddle positions in the completed bridge state and discusses the calculation under different definitions. The relationship between the saddle position and the tower's centerline is analyzed, along with the eccentric compression of the tower. The feasibility of the proposed method is verified through a real-life suspension bridge.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Shaise K. John, Alessio Cascardi, Yashida Nadir
Summary: This study experimentally investigated the use of TRM material for reinforcing concrete columns. The results showed that increasing the number of textile layers effectively increased the axial strength. Additionally, the choice of fiber type and hybrid textile configuration also had a significant impact on strength improvement. A new design model that considers the effects of both the confining matrix and textile was proposed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chandrashekhar Lakavath, S. Suriya Prakash
Summary: This study experimentally investigated the shear behavior of post-tensioned UHPFRC girders, considering factors such as prestress level, fiber volume fraction, and types of steel fibers. The results showed that increasing prestress and fiber dosage could enhance the ultimate load-carrying capacity of the girders, reduce crack angle, and increase shear cracking load.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Vahid Goodarzimehr, Siamak Talatahari, Saeed Shojaee, Amir H. Gandomi
Summary: In this paper, an Improved Marine Predators Algorithm (IMPA) is proposed for size and shape optimization of truss structures subject to natural frequency constraints. The results indicate that IMPA performs better in solving these nonlinear structural optimization problems compared to other state-of-the-art algorithms.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chun-Xu Qu, Jin-Zhao Jiang, Ting-Hua Yi, Hong-Nan Li
Summary: In this paper, a computer vision-based method is proposed to monitor the deformation and displacement of building structures by obtaining 3D coordinates of surface feature points. The method can acquire a large number of 3D coordinates in a noncontact form, improve the flexibility and density of measurement point layout, and is simple and cost-effective to operate.
ENGINEERING STRUCTURES
(2024)
