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学者姓名：陈力波
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Abstract ：
Earthquake-induced debris flow landslides pose a serious threat to bridge structures. However, current research on the dynamic response and damage mechanisms of bridges due to debris flow landslides is still insufficient; the fragility analysis of bridges under the combined effects of earthquakes and related geological hazards needs further improvement. In this paper, a bridge dynamic response simulation method is proposed for the coupled effects of transverse earthquakes and debris flow landslides. The method first establishes an integrated model of the mountain and bridge piers, using the discrete element method to calculate the dynamic impact of the landslide on the piers. Subsequently, a nonlinear dynamic model of the bridge is established using the finite element method. By inputting the time histories of transverse seismic motion and landslide impact, the coupled effects of transverse earthquakes and landslides are analyzed. The paper analyzes the influence of sliding distance, landslide length, and slope gradient on the dynamic response and fragility of bridges through case studies. Research reveals that the shear capacity of the pier under the coupled effects of earthquakes and landslides should be considered. The combined effects also increase the displacement response of the piers, with the maximum pier top drift ratio of the case bridge increasing by 334 % at a 35 degrees slope compared to the earthquakeonly condition. Under the coupled effects of earthquakes and landslides, the piers will experience significant residual deformation in the direction of the landslide. Increases in sliding distance, landslide length, and slope gradient all increase the fragility of bridges under various damage states, with the complete damage probability of the case bridge rising from 5 % under earthquake-only conditions to 47 % at a 35 degrees slope. The slope gradient has the greatest sensitivity to the fragility of bridges, followed by the sliding distance, and finally the landslide length.
Keyword ：
Bridge damage mechanisms Bridge damage mechanisms Bridge fragility Bridge fragility Debris flow landslides Debris flow landslides Earthquake and landslide coupling Earthquake and landslide coupling Mountain bridges Mountain bridges
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| GB/T 7714 | Lian, Qiang , Chen, Libo , Dang, Xinzhi et al. Dynamic response and fragility of mountain bridges under the coupled effects of transverse earthquakes and landslides [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2025 , 188 . |
| MLA | Lian, Qiang et al. "Dynamic response and fragility of mountain bridges under the coupled effects of transverse earthquakes and landslides" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 188 (2025) . |
| APA | Lian, Qiang , Chen, Libo , Dang, Xinzhi , Zhuo, Weidong , Li, Changchun . Dynamic response and fragility of mountain bridges under the coupled effects of transverse earthquakes and landslides . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2025 , 188 . |
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As an integral part of assessing the seismic performance of structures, the probabilistic seismic demand-intensity relationship has been widely studied. In this study, the phenomenon of heteroscedasticity in probabilistic seismic demand models was systematically investigated. A brief review of the definition, diagnosis, and conventional treatment of heteroscedasticity is presented herein, and based on that, two more generalized methods for both univariate and multivariate cases are proposed. For a typical four-span simply supported girder bridge, a series of nonlinear time history analyses were performed through multiple stripe analysis to determine its seismic demand and intensity, which can be employed as a sample set. For both univariate and multivariate cases, probabilistic seismic demand models were developed based on the two aforementioned methods under the Bayesian regression framework, and the fitted results were compared and analyzed with the conventional models using linear regression approaches. This approach forms the foundation for further developing seismic fragility modeling of both bridge component and system. The results show that in the presence of probabilistic seismic demand considering heteroscedasticity, the patterns of nonconstant variance or covariance can be characterized effectively, and a better-calibrated prediction region than that of homoscedastic models can be provided. Additionally, it offers a more comprehensive pathway for precise seismic fragility analysis. The causes of the heteroscedasticity phenomenon and subsequent solutions are thoroughly discussed. The analysis procedures can be further embedded in seismic risk and resilience assessment, thus providing a more accurate basis for aseismic decision-making.
Keyword ：
Bayesian Bayesian Covariance regression Covariance regression Heteroscedasticity Heteroscedasticity Intensity measure Intensity measure Multiple-stripe analysis Multiple-stripe analysis Probabilistic seismic demand Probabilistic seismic demand Seismic fragility Seismic fragility
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| GB/T 7714 | Chen, Libo . Improved Probabilistic Seismic Demand-Intensity Relationship: Heteroscedastic Approaches [J]. | ASCE-ASME JOURNAL OF RISK AND UNCERTAINTY IN ENGINEERING SYSTEMS PART A-CIVIL ENGINEERING , 2025 , 11 (1) . |
| MLA | Chen, Libo . "Improved Probabilistic Seismic Demand-Intensity Relationship: Heteroscedastic Approaches" . | ASCE-ASME JOURNAL OF RISK AND UNCERTAINTY IN ENGINEERING SYSTEMS PART A-CIVIL ENGINEERING 11 . 1 (2025) . |
| APA | Chen, Libo . Improved Probabilistic Seismic Demand-Intensity Relationship: Heteroscedastic Approaches . | ASCE-ASME JOURNAL OF RISK AND UNCERTAINTY IN ENGINEERING SYSTEMS PART A-CIVIL ENGINEERING , 2025 , 11 (1) . |
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Current seismic design codes for bridge structures do not account for the influence of aftershock sequences, which, to some extent, overestimate the seismic performance for bridges subjected to mainshock-aftershock (MS-AS) scenarios. To address the great need for ground motion sequences tailored to specific research sites for fragility analysis, this study proposes a method for generating artificial MS-AS ground motion sequences based on the evolutional bimodal Kanai–Tajimi model and the Epidemic–Type Aftershock Sequence model. We establish a framework for MS-AS fragility analysis using an input–output Hidden Markov Model (IOHMM), where the damage states (DS) of bridge piers are considered unobservable and are inferred statistically through damage indices in an unsupervised manner. Model parameters are trained using intensity measure (IM) sequences and damage index (DI) sequences. Fragility curves for both the mainshock and state-dependent aftershocks considering multiple aftershocks are formulated based on the initial state probability and state transition probabilities of the proposed IOHMM. The fragility analysis results reveal that as the initial seismic damage level increases, the probability of aftershocks causing higher damage levels in the structure also increases, highlighting the significant impact of aftershocks on structural damage increments. Furthermore, we extend the proposed model to a bivariate seismic intensity measure and develop fragility surfaces. The proposed framework provides a novel approach and insights for tackling seismic fragility under multiple aftershocks. © 2024 John Wiley & Sons Ltd.
Keyword ：
bridge structure bridge structure input-output hidden Markov model input-output hidden Markov model mainshock-aftershock sequences mainshock-aftershock sequences seismic fragility seismic fragility
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| GB/T 7714 | Chen, L. , Zhou, J. . Seismic fragility analysis of girder bridges under mainshock-aftershock sequences based on input-output hidden Markov model [J]. | Earthquake Engineering and Structural Dynamics , 2024 , 53 (11) : 3469-3488 . |
| MLA | Chen, L. et al. "Seismic fragility analysis of girder bridges under mainshock-aftershock sequences based on input-output hidden Markov model" . | Earthquake Engineering and Structural Dynamics 53 . 11 (2024) : 3469-3488 . |
| APA | Chen, L. , Zhou, J. . Seismic fragility analysis of girder bridges under mainshock-aftershock sequences based on input-output hidden Markov model . | Earthquake Engineering and Structural Dynamics , 2024 , 53 (11) , 3469-3488 . |
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To investigate the axial compressive properties and failure modes of 18 locally corroded square steel tube short columns, salt spray corrosion tests were conducted. The findings indicate that local corrosion in the horizontal direction significantly impacts the ultimate bearing capacity of the specimens, with all failures occurring in the corroded areas. However, the influence of the corrosion area on the ultimate bearing capacity and ductility of the specimens is not evident. A local corrosion model for square steel tube short columns was developed using the finite element method. The ultimate bearing capacity determined through finite element simulation closely aligns with experimental results, validating the reliability of the simulation approach. Moreover, a comparison is made between the prediction models of the BP neural network and the GA-BP neural network, with the prediction effectiveness of each model evaluated using the leave-one-out method. The verification results indicate that the GA-BP neural network model demonstrates superior predictive performance, with an average error of 3.14%. © 2024
Keyword ：
Axial compression behavior Axial compression behavior BP-GA algorithm BP-GA algorithm Locally corroded Locally corroded Numerical simulation Numerical simulation Square steel tube short column Square steel tube short column
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| GB/T 7714 | Zhang, W. , Shi, J. , Xing, Z. et al. Study on mechanical properties of locally corroded square steel tube short column [J]. | Journal of Constructional Steel Research , 2024 , 222 . |
| MLA | Zhang, W. et al. "Study on mechanical properties of locally corroded square steel tube short column" . | Journal of Constructional Steel Research 222 (2024) . |
| APA | Zhang, W. , Shi, J. , Xing, Z. , Chen, L. , Guo, Z. , Wang, Z. et al. Study on mechanical properties of locally corroded square steel tube short column . | Journal of Constructional Steel Research , 2024 , 222 . |
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The framework for performance-based seismic design and assessment of bridges grapples with the pressing challenge of precisely estimating the seismic capacities correlation amongst bridge piers. To address this issue, a Bayesian semiparametric hierarchical model is proposed in this study to characterize such correlation. This model was applied to a database populated with multiple-column tests conducted by distinct research cohorts. Given that each group performed tests under analogous conditions, the model could be operationalized on the database to derive intraclass correlation coefficients that reflect the statistical correlation among piers tested by individual research groups. It is postulated that these coefficients also typify the capacity correlation across multiple bridge piers within a bridge system. After a thorough examination of the data set, particularly focusing on the nature of missing values, an appropriate multiple imputation technique was selected to address the missing data, aiming to approximate the most accurate intraclass correlation. The analysis revealed that, among the various damage limit states, the correlation coefficients spanned between 0.386 and 0.883. This suggests that the seismic capacity of bridge piers is influenced not only by design parameters but also by the experimental group. Utilizing independent or fully correlated relationships between capacities, rather than true correlation coefficients, can lead to significant deviations in the fragility curve, which increase with the number of bridge piers. Such observations accentuate the necessity of integrating authentic pier capacity correlations in the bridge system fragility analysis. © 2024 American Society of Civil Engineers.
Keyword ：
Bridge piers Bridge piers Hierarchical systems Hierarchical systems Piers Piers Seismic design Seismic design Seismology Seismology Statistical tests Statistical tests
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| GB/T 7714 | Chen, Libo , Mo, Ruchun , Chen, Yu et al. Investigation of Intraclass Correlation of Seismic Capacity for RC Bridge Piers Based on Hierarchical Model [J]. | ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering , 2024 , 10 (3) . |
| MLA | Chen, Libo et al. "Investigation of Intraclass Correlation of Seismic Capacity for RC Bridge Piers Based on Hierarchical Model" . | ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering 10 . 3 (2024) . |
| APA | Chen, Libo , Mo, Ruchun , Chen, Yu , Guo, Zhan , Zheng, Zhenfeng . Investigation of Intraclass Correlation of Seismic Capacity for RC Bridge Piers Based on Hierarchical Model . | ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering , 2024 , 10 (3) . |
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Current seismic design codes for bridge structures do not account for the influence of aftershock sequences, which, to some extent, overestimate the seismic performance for bridges subjected to mainshock‐aftershock (MS‐AS) scenarios. To address the great need for ground motion sequences tailored to specific research sites for fragility analysis, this study proposes a method for generating artificial MS‐AS ground motion sequences based on the evolutional bimodal Kanai–Tajimi model and the Epidemic–Type Aftershock Sequence model. We establish a framework for MS‐AS fragility analysis using an input–output Hidden Markov Model (IOHMM), where the damage states (DS) of bridge piers are considered unobservable and are inferred statistically through damage indices in an unsupervised manner. Model parameters are trained using intensity measure (IM) sequences and damage index (DI) sequences. Fragility curves for both the mainshock and state‐dependent aftershocks considering multiple aftershocks are formulated based on the initial state probability and state transition probabilities of the proposed IOHMM. The fragility analysis results reveal that as the initial seismic damage level increases, the probability of aftershocks causing higher damage levels in the structure also increases, highlighting the significant impact of aftershocks on structural damage increments. Furthermore, we extend the proposed model to a bivariate seismic intensity measure and develop fragility surfaces. The proposed framework provides a novel approach and insights for tackling seismic fragility under multiple aftershocks.
Keyword ：
bridge structure bridge structure input-output hidden Markov model input-output hidden Markov model mainshock-aftershock sequences mainshock-aftershock sequences seismic fragility seismic fragility
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| GB/T 7714 | Libo Chen , Liangpeng Chen , Jianhong Zhou . Seismic fragility analysis of girder bridges under mainshock‐aftershock sequences based on input‐output hidden Markov model [J]. | Earthquake Engineering & Structural Dynamics , 2024 , 53 (11) : 3469-3488 . |
| MLA | Libo Chen et al. "Seismic fragility analysis of girder bridges under mainshock‐aftershock sequences based on input‐output hidden Markov model" . | Earthquake Engineering & Structural Dynamics 53 . 11 (2024) : 3469-3488 . |
| APA | Libo Chen , Liangpeng Chen , Jianhong Zhou . Seismic fragility analysis of girder bridges under mainshock‐aftershock sequences based on input‐output hidden Markov model . | Earthquake Engineering & Structural Dynamics , 2024 , 53 (11) , 3469-3488 . |
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Abstract ：
余震概率性地震危险性分析对主震发生后的地震风险评估至关重要。经典的余震概率性地震危险性分析框架基于Reasenberg-Jones(R-J)模型建立，但R-J模型对复杂的地震序列可能存在预测失效的问题，因此，将对真实余震序列描述较好的传染型余震序列模型(epidemic-type aftershock sequence, ETAS)结合到余震概率性地震危险性分析框架中，以2008年汶川7.9级余震序列和2014年鲁甸6.2级余震序列为例，评估余震危险性的重要性以及探讨ETAS模型相对于R-J模型在余震概率性地震危险性分析中的差异。结果表明：余震危险性水平与主震震级大小有关，主震震级越大，余震危险性水平越高，持续时间越久，对于震级较大的强主震事件，主震发生后早期的余震危险性不容忽略。对于汶川7.9级和鲁甸6.2级地震事件，在余震发生率预测效能上ETAS模型优于R-J模型，而在余震危险性评估中，余震危险性的大小取决于余震发生率，基于R-J模型计算的余震发生率大于ETAS模型计算的余震发生率，因此，在余震危险性评估中使用R-J模型相比于ETAS模型会造成对余震危险性水平的高估，ETAS模型可用于改进余震概率性地震危险性评估框架。
Keyword ：
ETAS模型 ETAS模型 R-J模型 R-J模型 余震序列 余震序列 余震概率性地震危险性分析 余震概率性地震危险性分析
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| GB/T 7714 | 陈力波 , 陈良鹏 , 周健鸿 . 基于ETAS模型的余震概率性地震危险性分析 [J]. | 自然灾害学报 , 2024 , 33 (04) : 22-33 . |
| MLA | 陈力波 et al. "基于ETAS模型的余震概率性地震危险性分析" . | 自然灾害学报 33 . 04 (2024) : 22-33 . |
| APA | 陈力波 , 陈良鹏 , 周健鸿 . 基于ETAS模型的余震概率性地震危险性分析 . | 自然灾害学报 , 2024 , 33 (04) , 22-33 . |
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This paper investigated the axial compressive behavior of concrete-filled square steel tube (CFSST) columns with debonding defects. Experimental tests were conducted on 117 CFSST columns to examine the influence of debonding defects on their failure modes and performance deterioration. The results showed that pronounced buckling and concrete cracking were observed at the debonding interface due to stress concentration. The presence of debonding defects slightly decreases the ultimate load-carrying capacity of CFSST columns but more significantly deteriorates the ductility and initial stiffness. A 2.5% volume debonding rate reduces ultimate load- carrying capacity by 11.8 %, while ductility coefficient and initial stiffness by 27.4 % and 38.1 %, respectively. Furthermore, the debonding-induced imbalance in the constraint effect of the steel tube significantly contributes to the performance deterioration of CFSST columns. This deterioration is more severe in columns with concentrated defects compared to those with uniformly dispersed defects. Finally, a theoretical formula was proposed to accurately predict the ultimate load-carrying capacity of CFSST columns with debonding defects. This formula takes into account the deterioration of the constraint effect caused by interfacial debonding. These findings inform failure and deterioration analysis for CFST structures with debonding issues.
Keyword ：
Concrete-filled square steel tube column Concrete-filled square steel tube column Constraint effect Constraint effect Debonding defects Debonding defects Deterioration mechanism Deterioration mechanism Finite element analysis Finite element analysis Theoretical calculation formula Theoretical calculation formula
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| GB/T 7714 | Lin, Yuhan , Zheng, Jinhuo , Chen, Libo et al. Performance deterioration analysis of CFSST columns with debonding defects under axial compression [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 226 . |
| MLA | Lin, Yuhan et al. "Performance deterioration analysis of CFSST columns with debonding defects under axial compression" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 226 (2024) . |
| APA | Lin, Yuhan , Zheng, Jinhuo , Chen, Libo , Chen, Jinbiao , Li, Xuetong , Zhang, Xiaoyong et al. Performance deterioration analysis of CFSST columns with debonding defects under axial compression . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 226 . |
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The semiconductor industry's rapid evolution necessitates ultra-high-purity N-methyl pyrrolidone (NMP) as an essential electronic-grade solvent. The development of an efficient coordination material to reduce trace metal ions, particularly Na and K metal ions, to below 1 ppb in NMP solution is a significant challenge. To address this, a novel coordination material, St-DVB-g-ACE, has been developed for the removal of Na and K metal ions from NMP. The material was synthesized by grafting 4 '-aminobenzo-15-crown-5-ether onto a strong acid gel resin. The resulting St-DVB-g-ACE-3 exhibited excellent coordination performance for Na and K metal ions, with maximum Langmuir adsorption capacities reaching 20,000 mu g/g and 33,333 mu g/g, respectively. Of particular interest was the ability of St-DVB-g-ACE-3 to reduce all trace metal ions in industrial-grade NMP to below 1 ppb within a fixed bed column, achieving the stringent requirements for electronic-grade NMP at the G3 level. Additionally, the absorbent enhances the purity of NMP from 99.82 % to 99.84 %, indicating that the material is not dissolved and can exist stably in NMP. Its excellent recyclability and reproducibility make it highly practical for industrial use. Density functional theory (DFT) simulation, complemented by spectral analyses, revealed the interaction force and thermodynamic properties between Na and K metal ions and crown ether ring, and illustrated the interaction between anionic sulfonic group (- SO3- ) and metal ions. The prepared resin-grafted crown ether adsorbents are highly effective in the thorough removal of trace metal ions from NMP solution, offering a novel and effective method for the production of electronic-grade NMP.
Keyword ：
4 ' -Aminobenzo-15-crown-5-ether 4 ' -Aminobenzo-15-crown-5-ether Electronic-grade NMP Electronic-grade NMP Removal of trace Na and K metal ions Removal of trace Na and K metal ions Resin Resin The coordination mechanism The coordination mechanism
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| GB/T 7714 | Chang, Zhouxin , Guo, Wenli , Yang, Chen et al. Removal of trace Na and K metal ions by resin-grafted crown ether for electronic-grade N-methyl pyrrolidone purification [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 356 . |
| MLA | Chang, Zhouxin et al. "Removal of trace Na and K metal ions by resin-grafted crown ether for electronic-grade N-methyl pyrrolidone purification" . | SEPARATION AND PURIFICATION TECHNOLOGY 356 (2024) . |
| APA | Chang, Zhouxin , Guo, Wenli , Yang, Chen , Ye, Changshen , Wang, Qinglian , Li, Bochen et al. Removal of trace Na and K metal ions by resin-grafted crown ether for electronic-grade N-methyl pyrrolidone purification . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 356 . |
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Current seismic design codes for bridge structures do not account for the influence of aftershock sequences, which, to some extent, overestimate the seismic performance for bridges subjected to mainshock-aftershock (MS-AS) scenarios. To address the great need for ground motion sequences tailored to specific research sites for fragility analysis, this study proposes a method for generating artificial MS-AS ground motion sequences based on the evolutional bimodal Kanai-Tajimi model and the Epidemic-Type Aftershock Sequence model. We establish a framework for MS-AS fragility analysis using an input-output Hidden Markov Model (IOHMM), where the damage states (DS) of bridge piers are considered unobservable and are inferred statistically through damage indices in an unsupervised manner. Model parameters are trained using intensity measure (IM) sequences and damage index (DI) sequences. Fragility curves for both the mainshock and state-dependent aftershocks considering multiple aftershocks are formulated based on the initial state probability and state transition probabilities of the proposed IOHMM. The fragility analysis results reveal that as the initial seismic damage level increases, the probability of aftershocks causing higher damage levels in the structure also increases, highlighting the significant impact of aftershocks on structural damage increments. Furthermore, we extend the proposed model to a bivariate seismic intensity measure and develop fragility surfaces. The proposed framework provides a novel approach and insights for tackling seismic fragility under multiple aftershocks.
Keyword ：
bridge structure bridge structure input-output hidden Markov model input-output hidden Markov model mainshock-aftershock sequences mainshock-aftershock sequences seismic fragility seismic fragility
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| GB/T 7714 | Chen, Libo , Chen, Liangpeng , Zhou, Jianhong . Seismic fragility analysis of girder bridges under mainshock-aftershock sequences based on input-output hidden Markov model [J]. | EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS , 2024 , 53 (11) : 3469-3488 . |
| MLA | Chen, Libo et al. "Seismic fragility analysis of girder bridges under mainshock-aftershock sequences based on input-output hidden Markov model" . | EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS 53 . 11 (2024) : 3469-3488 . |
| APA | Chen, Libo , Chen, Liangpeng , Zhou, Jianhong . Seismic fragility analysis of girder bridges under mainshock-aftershock sequences based on input-output hidden Markov model . | EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS , 2024 , 53 (11) , 3469-3488 . |
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