Engineering Structures最新文献

{"title":"Machine learning-based and interpretable models for predicting the resistance and probability of progressive collapse of steel frame-composite floor structures","authors":"Yuxu Guo ,&nbsp;Bo Yang ,&nbsp;Shagea Alqawzai ,&nbsp;Kang Chen ,&nbsp;Deyang Kong","doi":"10.1016/j.engstruct.2025.120089","DOIUrl":"10.1016/j.engstruct.2025.120089","url":null,"abstract":"<div><div>Steel frame-composite floor (SF-CF) structures are particularly susceptible to progressive collapse due to their complex load distribution and potential vulnerabilities at critical joints, making them a high-risk system in the event of localized failure. This study aims to investigate the methods for predicting and analyzing the progressive collapse behavior of SF-CF structures. A theoretical and predictive model was developed based on the Minimal Substructure Mechanics Model and the Collapse Probability Prediction Method Based on the Randomness of Structural Load (CPPM-RSL). Machine learning (ML) techniques from artificial intelligence (AI) were employed to predict and analyze the progressive collapse behavior probabilistically. Initially, a dataset comprising various scenarios of column failure was established. The performance of five typical ML models was assessed and compared based on this dataset, focusing on the robustness and generalization capability. Results revealed that the XGBoost model demonstrated inferior performance compared to the other four models, particularly regarding generalization capability. More refined hyperparameter optimization was performed to attempt to improve the performance of the XGBoost model. Grid search was employed to obtain the optimum hyperparameter configuration. K-Fold cross-validation was employed to further examine the generalization capability of the model under the optimal hyperparameter configuration. Additionally, reducing model complexity by decreasing the number of features was also attempted in response to the overfitting observed in the XGBoost model. The results indicated that these approaches did not significantly enhance the performance of the XGBoost model. Moreover, interpretable models based on the Shapley Additive exPlanations (SHAP) method and five ML models were developed. The importance of features in predicting structural collapse and their impact mechanisms were elucidated, providing recommendations to boost the structural resistance to collapse. It was also indicated that the employment of weak learners in XGBoost yields predictive values less than true values despite the obtained values being raised as much as possible in the SHAP values of the XGBoost model. Optimizing the structural geometric characteristics proved to be more effective than improving the properties of material in increasing the collapse resistance of structures. In conclusion, this study attempts to apply ML methods for predicting structural collapse behavior and provides a potential approach for predicting progressive collapse.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120089"},"PeriodicalIF":5.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vibration source characteristics and vibration reduction mechanism of the novel rubber pad floating slab track in metro turnout areas","authors":"Chuanqing Dai ,&nbsp;Tao Xin ,&nbsp;Sen Wang ,&nbsp;Yi Yang ,&nbsp;Chao Kong","doi":"10.1016/j.engstruct.2025.120107","DOIUrl":"10.1016/j.engstruct.2025.120107","url":null,"abstract":"<div><div>The vibration issues induced by metro turnout areas have become increasingly prominent recently. The novel rubber pad floating slab track (RPFST) is a type of assembled vibration-reducing track with the feature of slab-pad composite structure. To investigate the vibration source characteristics and the mechanism of vibration energy attenuation among different structural layers of the novel RPFST when a metro train passes through the turnout area, a vehicle-turnout-tunnel rigid-flexible coupled dynamic model was established based on the finite element method. It not only reflects the unique wheel-rail contact relationships in turnout area but also represents the vibration transmission of the nonlinear structural components of the turnout. Results show that, compared to the ordinary monolithic track bed (OMTB), the vibration source in the turnout area equipped with the novel RPFST exhibits narrower frequency band distribution, lower vibration amplitude, and longer vibration attenuation time. The novel RPFST can reduce the dominant frequency of tunnel wall vibrations. The dominant frequency in the crossing panel is higher than in other sections. The vertical and lateral vibration spectra of the tunnel wall both exhibit the characteristic of two frequency peaks, with the vertical vibration amplitude being about 1.3 times that of the lateral direction. The novel RPFST significantly attenuates the mid-to-low frequency vibration energy above 25 Hz in the turnout area, reducing energy by around 80 % after passing through the rubber pad layer, with a transmission loss can reach 23 dB. Compared to the OMTB, the insertion loss of the novel RPFST in the switch panel, closure panel, and crossing panel is 8 dB, 13 dB, and 9 dB, respectively.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120107"},"PeriodicalIF":5.6,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quasi-static testing of rocking piers for railway bridges","authors":"Leixin Nie ,&nbsp;Lizhong Jiang ,&nbsp;Wangbao Zhou ,&nbsp;Zhiyong Jiang ,&nbsp;Yulin Feng ,&nbsp;Zhipeng Lai","doi":"10.1016/j.engstruct.2025.120110","DOIUrl":"10.1016/j.engstruct.2025.120110","url":null,"abstract":"<div><div>Rocking piers are increasingly recognized as a viable seismic isolation strategy for bridges. Compared to highway bridges, railway bridges are subjected to more stringent requirements for post-seismic functional recovery due to the elevated operational standards of train travel. Conventional rocking piers, however, encounter significant challenges. This study presents a rocking pier system specifically designed for railway bridges, with its feasibility confirmed through quasi-static testing. The test results demonstrate that incorporating rocking resilient hinges (RRHs) at the rocking interface enhances the rotational stability of the piers. The RRHs and horizontal limiting devices provide the pier with a nearly constant center of rotation during the rocking phase. This configuration effectively mitigates the inaccuracies typically associated with predicting the compressed area height of conventional rocking interfaces, significantly enhancing the predictive accuracy of the piers' behavior during and after earthquakes. An enlarged steel plate mounted on the top surface of the RRH assists in stress distribution, effectively preventing localized concrete damage and reducing repair costs following seismic events. In addition, the system's replaceable external energy dissipation devices facilitate rapid post-earthquake recovery. By embedding continuous unbonded prestressed tendons within the pier and coordinating with an enlarged base, the rocking interface remains closed under normal operational conditions or during frequent earthquakes, ensuring uninterrupted train functionality. The system's 'locking' mechanism is a final safeguard, fulfilling critical life safety objectives.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120110"},"PeriodicalIF":5.6,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flexural behaviors of GFRP-reinforced Engineered Cementitious Composite (ECC)-concrete composite beams","authors":"Li-Hui Wang ,&nbsp;Wen-Hao Shi ,&nbsp;Lan-Ping Qian ,&nbsp;Yu-Lei Bai ,&nbsp;Shi-Zhu Liu ,&nbsp;Zhan-Qun Yang","doi":"10.1016/j.engstruct.2025.120097","DOIUrl":"10.1016/j.engstruct.2025.120097","url":null,"abstract":"<div><div>The use of Fiber-Reinforced Polymer (FRP) bars as an alternative to steel bars addresses corrosion challenges in conventional concrete structures. However, the lower elastic modulus of FRP bars typically leads to excessive deformation and crack widening. This study investigates the synergistic effects of combining glass FRP (GFRP) bars with Engineered Cementitious Composites (ECC) to enhance the flexural performance of concrete beams. Seven beams were tested, including concrete, full-ECC, and composite beams with varying reinforcement ratios and configurations. Results demonstrated that ECC integration significantly improved load-bearing capacity (up to 6.2 % in composite beams), ductility (1.5 times higher than concrete beams), and crack control (crack widths reduced by 83 % in composite beams). A sectional analysis model accurately predicted flexural behavior, revealing that the tensile contribution of ECC diminishes at higher reinforcement ratios (&gt;1.84 %), thereby serving as a safety reserve. An optimal ECC layer-to-beam height ratio of 0.3–0.4 was proposed to balance performance. This work advances the understanding of GFRP-ECC systems, offering practical insights for the design of durable and high-performance structures.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120097"},"PeriodicalIF":5.6,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study of different fiber composites used to repair damaged coal gangue sintered brick masonry panels: Diagonal compression and cyclic shear compression behavior","authors":"Fenghao Qu ,&nbsp;Shiping Yin ,&nbsp;Huarui Liu","doi":"10.1016/j.engstruct.2025.120112","DOIUrl":"10.1016/j.engstruct.2025.120112","url":null,"abstract":"<div><div>Fiber-reinforced composites represent one of the most effective technologies for seismic protection and post-earthquake damaged masonry structures in regions prone to seismic activity. However, existing masonry structures and post-earthquake damaged masonry structures may experience damage of varying severity, which seriously affects the effectiveness of fiber-reinforced composites. To elucidate the mechanisms through which various fiber composites enhance the shear and seismic resilience of damaged walls, comprehensive in-plane diagonal compression and cyclic shear tests were conducted on both masonry walls and confined masonry (CM) walls retrofitted with fiber-reinforced polymers (FRP), textile-reinforced concrete (TRC), and engineered cementitious composites (ECC). An analysis revealed that unreinforced and mortar-reinforced walls exhibited significant brittleness upon failure. In contrast, FRPs, TRCs, and ECCs considerably improved deformability while delaying the onset of cracking and stiffness deterioration. The efficiency of the FRP in enhancing the shear strength was slightly superior to that of the other two materials, whereas the ECC and TRC had comparable effects on improving the shear strength. Among the reinforced samples, those strengthened with ECCs presented the best ductility and energy dissipation capacity, whereas the FRP-reinforced samples presented the lowest ductility. The performance of the TRC-strengthened samples fell between those of the other samples. The investigation of diagonal compression revealed that the reinforced walls demonstrated significant enhancements in shear stress, initial stiffness, ductility, and energy dissipation compared to unreinforced walls, with improvements ranging from 19.9 % to 44.1 %, 8.1 %-30.5 %, 39.7 %-185.2 %, and 142.1 %-558.2 %, respectively. Additionally, in the context of cyclic shear compression, the reinforced walls exhibited improvements in peak load, ductility, and energy dissipation by 3.4 %-22.1 %, 24.5 %-100 %, and 66.9 %-180.8 %, respectively. Severely damaged CM walls reinforced with TRC and ECC met the requisite stability requirements under “large earthquakes,” whereas FRPs ensured stability only under moderate earthquakes. Pre-damaged CM walls reinforced with ECCs, TRCs, and FRPs can guarantee stability under conditions of large, moderate, and minor earthquakes, respectively.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120112"},"PeriodicalIF":5.6,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulated field assembly bending experiment and mechanical model of sink-insert joints for prefabricated two-wall-in-one diaphragm walls","authors":"Tong Qiu ,&nbsp;Xiangsheng Chen ,&nbsp;Dong Su ,&nbsp;Wei Rao ,&nbsp;Aidong Li","doi":"10.1016/j.engstruct.2025.120109","DOIUrl":"10.1016/j.engstruct.2025.120109","url":null,"abstract":"<div><div>The prefabricated two-wall-in-one diaphragm wall (PTDW) represents a groundbreaking approach, integrating temporary enclosure with permanent structures into a single prefabricated wall, thereby reducing material usage by 45 % and shortening construction duration by 40 % through mechanical assembly. However, the bending performance of the CT lock-based sink-insert joints, facilitating efficient mechanical assembly, remains an under-explored technological challenge. This study addresses this gap by conducting a novel simulated field assembly bending experiment and developing a parameterized model to evaluate joint mechanics. Furthermore, the application and optimization of this technology in the Shenzhen Metro are presented. Key findings encompass: (1) The CT locks employed in this novel joint exhibit a characteristic of initial gaps, and full-scale experiment has revealed that cracks and separation serve as indicators of the elastic-plastic transition and ultimate bearing capacity. (2) Despite the initial gaps, the CT lock constraints effectively enhance the joint ductility and longitudinal stability of the PTDW. (3) A pivotal load-bearing feature of the sink-insert joint is its manifestation of ductile hinged joint properties under the constraints by the CT locks. (4) The proposed model underscores the benefits of multi-parameter optimization, achieving a notable 22 % reduction in steel consumption while maintaining both the bearing capacity and stiffness of the system. This research addresses critical PTDW joint challenges, advancing low-carbon and high-quality urban construction practices.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120109"},"PeriodicalIF":5.6,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fatigue behavior of CFRP-strengthened butt-welded high-strength steel connections with surface cracks","authors":"Yining Zhang ,&nbsp;Lili Hu ,&nbsp;Tao Chen ,&nbsp;Andre Cahyadi Salim","doi":"10.1016/j.engstruct.2025.120090","DOIUrl":"10.1016/j.engstruct.2025.120090","url":null,"abstract":"<div><div>This paper presents an experimental and numerical study on the fatigue behavior of butt-welded high-strength steels (HSS) Q960, Q890, and HG785, strengthened with a one-layer, double-sided carbon fiber-reinforced polymer (CFRP) sheet in the presence of surface cracks. Two tensile fatigue loading spectrums were designed: one with a maximum stress at half the yield strength and another at 200 MPa, both maintaining a stress ratio (<em>R</em>) of 0.1. The results indicated that CFRP strengthening increased fatigue life by 1.06–1.36 times at half yield strength and by 1.86–2.59 times at 200 MPa. The primary failure modes were a combination of CFRP fracture, fiber separation, and delamination at half yield strength and delamination and fiber separation at 200 MPa. A finite element method (FEM) model was developed, showing high accuracy for strengthened specimens using a bilinear bond-slip model to account for adhesive damage. Based on the FEM results, a fatigue life prediction model was proposed using Paris Law. The study also examined the effects of adhesive damage, initial crack size, and plate dimensions. Considering adhesive damage in fatigue life predictions is crucial, especially when high modulus CFRPs are applied. The initial crack shape had some influence on the elliptic crack propagation and debonding development. CFRP was more effective in restricting crack growth near the surface than in deeper regions. However, the fatigue life and strengthening effect of CFRP were largely dependent on the initial crack area rather than its shape. Increasing the width of the steel plate had a limited effect on extending fatigue life, as surface crack propagation (SCP), which is primarily influenced by thickness, represented a significant proportion of the total fatigue life.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120090"},"PeriodicalIF":5.6,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reinforcement design and structural performance for the topology optimized 3D printed concrete truss beams","authors":"Qiang Wang ,&nbsp;Wenwei Yang ,&nbsp;Li Wang ,&nbsp;Gang Bai ,&nbsp;Guowei Ma","doi":"10.1016/j.engstruct.2025.120064","DOIUrl":"10.1016/j.engstruct.2025.120064","url":null,"abstract":"<div><div>Reinforced 3D printed concrete (3DPC) truss structure, owing to its ease of fabrication and light-weight configurations, is increasingly accepted as a popular load-bearing system. However, the understanding into its reinforcement design and structural performance is still scarce up to now, failing to guide the wide application efficiently and appropriately. To upgrade current design methods and improve structural performance, this study introduces a workflow for integrating the topology optimization, reinforcement design and structural performance evaluation into the design of reinforced 3DPC truss beams. In the proposed workflow, the topology optimization process considering the printing constraints was employed to produce the 3DPC truss configuration, incorporating only tension and compression struts to reduce structural weight and enhance stress transfer efficiency. The reinforcing bar characteristics in the struts were identified based on the proposed reinforcing bar selection criterion from the perspective of bond performance. The overall reinforcement strategies between the printed layers were designed based on the stress flow to endow the un-reinforced truss with load-bearing and ductile properties. The flexural performance of the topology optimization-based reinforced 3DPC truss beams was experimentally evaluated. A finite element model was afterwards developed to support a parametric study aimed at optimizing the flexural design. Significantly, the topology optimized 3DPC truss beams demonstrated to achieve a 94 % improvement in strength-to-weight ratio while preserving the same failure deflection-to-weight ratio as traditional reinforce concrete (RC) beams.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120064"},"PeriodicalIF":5.6,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lateral behavior of circular concrete columns reinforced with partially unbonded steel basalt-fiber composite bars and hybrid stirrups","authors":"Yunlou Sun ,&nbsp;Zeyang Sun ,&nbsp;Yi Zheng ,&nbsp;Liuzhen Yao ,&nbsp;Xiaoning Cai ,&nbsp;Adam I. Ibrahim","doi":"10.1016/j.engstruct.2025.120051","DOIUrl":"10.1016/j.engstruct.2025.120051","url":null,"abstract":"<div><div>Utilizing steel basalt fiber reinforced polymer (FRP) composite bars (SBFCBs) in concrete structures offers numerous benefits, such as controllable post-yield stiffness and reduced residual displacement. The effects of the degree of confinement, post-yield stiffness and unbonded length on the SBFCBs reinforced columns have not been conclusively evaluated. First, the axial compressive test of short concrete columns confined by hybrid stirrup with a confine ratio of 0.28 (equal-strength stirrup ratio of 1.23 %) showed that the hybrid stirrup could increase the axial compressive strength of the plain concrete from 51.8 MPa to 89.8 MPa, with an increase of 73.3 %, and the corresponding ultimate strain is 0.0282. Dong's model (FRP confined concrete) for predicting the axial stress-strain curve of steel basalt fiber reinforced polymer (BFRP) hybrid stirrups (SBFHSs) confined concrete was validated, and damage assessment based on concrete damage plastic model (CDPM) was performed. Subsequently, 3D finite element analysis (FEA) models of partially unbonded SBFCBs and SBFHSs-reinforced concrete columns were established and verified. Variables include the post-yield modulus ratio (<em>r</em>_sf) of reinforcement, unbonded length (<em>l</em>_ub), and core concrete’s confined level (C_<em>y</em>). The results showed that, compared to column S12, the load capacity and post-yield stiffness ratio of column SUB-R0.5-C2-U0, with a post-yield modulus ratio of 0.5 and C2 grade core concrete (with confine ratio of 0.20, <em>ε</em>_cu=0.0147, <em>f</em>_cu=74.50 MPa), increased by 20.2 % and 325.0 %, respectively. The unbonded reinforcement has a positive impact on the post-yield stiffness ratios and the <em>l</em>_ub may significantly increase the <em>r</em>_c (ranging from 2.21 % to 6.54 %). The effects of design parameters (<em>r</em>_sf, <em>l</em>_ub and C<em>_y</em>) on the post-yield stiffness ratios (<em>r</em>_c) and ductility index (<em>μ</em>_<em>δ</em>) were evaluated. The results show that, compared to fully bonded column, the slip deformation of SUB-R0.5-(C1∼C5)-U450 increased by 89.3 %, 97.8 %, 56.2 %, 107.1 %, and 146.1 %, respectively, indicating that the significant impact of unbonded reinforcement on slip on deformation. An empirical formula for the post-yield stiffness ratio, considering the unbonded length and the confined level of the core concrete, is presented with high accuracy, exhibiting a root mean square error (RMSE) of only 4.27 %. The debonding treatment described here is expected to provide a performance improvement and design methodology for resilient bridge piers.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120051"},"PeriodicalIF":5.6,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143620225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lost data recovery for structural vibration data based on improved U-shaped encoder–decoder networks","authors":"Xize Chen ,&nbsp;Wensong Zhou ,&nbsp;Jie Yang ,&nbsp;Xiulin Zhang ,&nbsp;Yonghuan Wang","doi":"10.1016/j.engstruct.2025.120096","DOIUrl":"10.1016/j.engstruct.2025.120096","url":null,"abstract":"<div><div>Data loss often occurs in structural health monitoring due to hardware system malfunctions, such as sensor faults, abnormal data acquisition, and disturbed wireless transmission. This data loss significantly affects subsequent data analysis and structural safety assessment. In this study, an innovative U-shaped neural network is proposed for recovering lost data in structural vibration measurements. Specifically, the network introduces attention gate mechanisms and residual connection blocks to facilitate efficient information transmission between channels. Additionally, an imputation mask matrix layer is introduced in the model to control the network output results and calculate the recovery loss of lost data specifically, thereby alleviating the burden of network parameter optimization. Verification was conducted on single-channel and multi-channel data from practical engineering of large-span bridges by comparing the recovery levels in the time and frequency domains. Different missing ratios are set, a mask matrix is used to construct random lost data, and the proposed model is used to reconstruct the lost data. Results show that the network can efficiently and accurately recover lost data by learning the correlation of the channel's remaining data itself, even at 90 % loss ratio for a single channel. The role of each module of the model is also verified, and the correlation between the effectiveness of data recovery in multi-channel data and the loss ratio is analyzed. Furthermore, the model demonstrated a certain level of recovery capability for situations involving continuous data loss, leading to further exploration of potential extension applications of the model. The proposed approach offers a promising solution for addressing data loss challenges in structural health monitoring.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"332 ","pages":"Article 120096"},"PeriodicalIF":5.6,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}