Computers & Structures最新文献

{"title":"Multi-vehicle responses for high-resolution bridge mode shape identification integrating Kalman filter and compressive sensing","authors":"Yi He ,&nbsp;Judy P. Yang","doi":"10.1016/j.compstruc.2025.107837","DOIUrl":"10.1016/j.compstruc.2025.107837","url":null,"abstract":"<div><div>This study introduces a three-step procedure for identifying high-resolution bridge mode shapes using responses from a limited number of test vehicles. First, contact-point displacements are retrieved from the vehicle responses using the generalized Kalman filter with unknown input algorithm. Second, the sparse bridge response matrix, populated with contact-point displacements, is completed using the spatial compressive sensing theory. Third, high-resolution mode shapes are extracted by applying singular value decomposition in the completed response matrix. An illustrative example shows that the first two mode shapes of a 60-m bridge can be well identified using the responses of eight test vehicles, achieving a spatial resolution of 0.5 m. The performance of the procedure is further evaluated by considering practical factors, including bridge boundary conditions, environmental noises, and the number of test vehicles. Additionally, the subtraction strategy has successfully removed the effect of pavement irregularity for mode shape construction. The capability of the procedure for accurately and effectively identifying the high-resolution bridge mode shapes is therefore demonstrated.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107837"},"PeriodicalIF":4.4,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D-printed concrete fracture: Effects of cohesive laws, mixes, and print parameters in 3D eXtended FEM","authors":"Faisal Mukhtar","doi":"10.1016/j.compstruc.2025.107822","DOIUrl":"10.1016/j.compstruc.2025.107822","url":null,"abstract":"<div><div>Unlike conventional concrete fractures, few models of 3D-printed concrete (3DPC) fractures have been reported; moreover, systematic validation across diverse tests, materials, and laboratories is lacking. This paper first reviews existing 3DPC fracture simulations against experiments, noting mixed performance in most cases. Additionally, current models often require excessive material parameters that can be difficult to measure and interpret, along with a scarcity of 3D modeling. To address these issues, the paper develops a robust 3D validation framework using the generalized/eXtended finite element method to simulate both interlayer bonds and intralayer fractures in 3DPC/cementitious materials. Four softening models were assessed by capturing linear and nonlinear fracture responses under tensile, bending, and shear tests. Different 3DPC mixtures (plain, fiber-reinforced, and limestone-calcined clay) from existing experimental studies across different laboratories were used for validation, showing good agreement with experimental load–displacement behavior. The influences of layer print interval and nozzle standoff distance from two separate tests were investigated, revealing that the bilinear cohesive model provided the most consistent predictions for plain and fiber-reinforced 3DPC under tension and bending. In contrast, the Park–Paulino–Roesler and Xu–Needleman cohesive models better captured fracture behavior for the limestone-calcined clay mix, while the linear cohesive model was most suitable for shear mode. A fracture in a topologically optimized 3DPC girder was also simulated, illustrating the method’s applicability to large-scale structural elements, the importance of the material mix, and highlighting a scenario where 2D approximations are inapplicable.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107822"},"PeriodicalIF":4.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional train-periodic slab track-subgrade dynamics model based on the iterative solution and Green’s function method","authors":"Yu Sun ,&nbsp;Sen Zhang ,&nbsp;Mengting Xing ,&nbsp;Zhiyong Shi ,&nbsp;Pengfei Liu","doi":"10.1016/j.compstruc.2025.107784","DOIUrl":"10.1016/j.compstruc.2025.107784","url":null,"abstract":"<div><div>This paper develops an iterative solution model for the efficient and accurate simulation of the dynamics of a three-dimensional (3D) train-periodic slab track-subgrade (TPSTS) system. The entire system is divided into the train-rail subsystem and the periodic slab-subgrade subsystem. An ordinary differential equation (ODE) model of the train-rail system is established, and a step-moving strategy is employed to enhance the computational efficiency. A frequency-domain Green’s function method (GFM) model is employed for modelling the periodic slab-subgrade. Considering the periodicity, symmetry, and attenuation characteristics of the track structure, the Green’s function of the slab-subgrade structure is obtained by conducting harmonic response analysis on a finite element model (FEM) of a quarter slab-subgrade structure. The proposed model is utilized to investigate the vibration characteristics of the high-speed train-track-subgrade system. The results indicate that the model exhibits good convergence, accuracy, and efficiency. The periodicity of the track structure has a significant impact on the statistical values of subgrade displacement and stress amplitudes along the track’s longitudinal direction. At the subgrade surface, the amplitudes of displacement, stress, and acceleration exhibit fluctuations in the lateral direction of the track. However, with increasing depth, these amplitudes generally attenuate, leading to a more uniform distribution.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107784"},"PeriodicalIF":4.4,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigations of the abrasion behavior of concrete based on a coupled Eulerian–Lagrangian approach","authors":"Qiong Liu ,&nbsp;Lars Vabbersgaard Andersen ,&nbsp;Min Wu ,&nbsp;Mingzhong Zhang ,&nbsp;Didier Snoeck","doi":"10.1016/j.compstruc.2025.107808","DOIUrl":"10.1016/j.compstruc.2025.107808","url":null,"abstract":"<div><div>This paper presents numerical investigations of the abrasion behavior of concrete for hydraulic structures considering concrete structural characteristics as well as various hydraulic conditions. Three-dimensional mesoscale models of concrete composed of aggregates, mortar, and interfacial transition zones are developed using in-house Python 2 codes and the commercial finite-element software Abaqus 2021. The coupled Eulerian–Lagrangian approach is employed to simulate the complex interaction effects between the hydrodynamic field and the concrete structure with a focus on abrasion material loss and energy response as functions of the governing hydraulic parameters (flow velocity and sediment concentration). The results indicate that the concrete abrasion behavior is greatly influenced by the flow velocity and sediment concentration, which are highly associated with the kinetic energy in the flow exerted on the concrete structure.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107808"},"PeriodicalIF":4.4,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Guided waves in anisotropic and viscoelastic stratified plates: Application to bone quantitative ultrasound","authors":"Ductho Le ,&nbsp;Haidang Phan ,&nbsp;Hoai Nguyen ,&nbsp;Mauricio D. Sacchi ,&nbsp;Lawrence H. Le","doi":"10.1016/j.compstruc.2025.107820","DOIUrl":"10.1016/j.compstruc.2025.107820","url":null,"abstract":"<div><div>This paper presents a numerical investigation into the behavior of ultrasonic guided waves in a multilayered bone plate characterized by anisotropic and viscoelastic properties. A spectral collocation formula for bone structures is developed, enabling accurate computation of three-dimensional dispersion curves, wave structures, and attenuation of guided waves. Additionally, a mode classification scheme is introduced to identify individual modes, facilitating mode selection during bone inversion. Our results are benchmarked against alternative wave computation methods and experimental data to validate their robustness and reliability. The effects of incorporating soft tissue and marrow into the bone models are explored in relation to mode number, trajectory, and attenuation. With its fast computational speed and mode-classification features, the proposed methodology serves as an effective forward modeling tool for enhanced ultrasonic bone assessment.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107820"},"PeriodicalIF":4.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A total Lagrangian selective smoothed finite element method for three-dimensional multi-body contact dynamics of biological soft tissue","authors":"Jingui Zhao ,&nbsp;Guirong Liu ,&nbsp;Gang Wang ,&nbsp;Chao Sun ,&nbsp;Zirui Li","doi":"10.1016/j.compstruc.2025.107821","DOIUrl":"10.1016/j.compstruc.2025.107821","url":null,"abstract":"<div><div>In this article, a total Lagrangian selective smoothed finite element method (Selective S-FEM) is proposed for 3D multi-body contact dynamic analysis of biological soft tissues. A time-dependent total Lagrangian explicit algorithm is formulated in the proposed Selective S-FEM to calculate nonlinear large deformation of soft materials, considering incompressible, hyperelastic, and visco-hyperelastic behaviors. To overcome the incompressibility, the shear deformation is evaluated using the Edge/Face-based S-FEM and volumetric deformation is handled via Node-based S-FEM. A multi-body contact algorithm is also implemented in our Selective S-FEM model using master–slave surface-based node-to-surface algorithms, together with the penalty function method. The contact algorithm enables multi-component, multi-material complex contact between soft-hard materials, as well as the hybrid contacts, such as knee joint contact and skull-brain contact resulted from impact. The proposed Selective S-FEM uses the four-node tetrahedral (T4) that can be generated automatically, and numerical examples have shown that the results are insensitive to large mesh distortion, robust in handling various contacts, and produces accurate stress solution.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107821"},"PeriodicalIF":4.4,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An efficient analytical method for broadband vibro-acoustic analysis of coupled beam-cavity systems","authors":"Xueyi Zhao ,&nbsp;Xiang Liu ,&nbsp;Vladislav Sorokin ,&nbsp;Wei Wang ,&nbsp;Jianqiang Guo","doi":"10.1016/j.compstruc.2025.107806","DOIUrl":"10.1016/j.compstruc.2025.107806","url":null,"abstract":"<div><div>This paper presents an analytical approach that integrates the dynamic stiffness method (DSM) with the spectral dynamic stiffness method (SDSM) for broadband vibro-acoustic modelling of coupled beam-cavity systems. This combined method uses frequency-dependent shape functions to describe both the structural and the acoustic domains, while the interaction between them is analytically modelled by using the modified Fourier series (MFS). In particular, the DSM uses the particular solutions of beams expanded by the MFS to express analytically acoustic pressure loadings of cavities, eliminating extra fine domain discretizations; the SDSM, on the other hand, formulates the coupling conditions using the MFS in a strong sense by direct enforcement of velocity continuity conditions at the coupling boundaries, enabling more accurate boundary condition handling and physically meaningful solutions. Finally, based on the system matrix equation with very few degrees of freedom, the efficient Wittrick–Williams algorithm is extended to extract eigenvalues of the coupled systems while vibro-acoustic responses are evaluated with high accuracy. The proposed method, validated against benchmark and practical problems, achieves up to 18 times faster computation than COMSOL while maintaining comparable accuracy. This promising method can provide an efficient tool for vibration and noise prediction during early design phases.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107806"},"PeriodicalIF":4.4,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel topology optimization sizing design method applied to a two-pile cap structure with a full nonlinear comparison","authors":"Rodrigo R. Amaral,&nbsp;Herbert M. Gomes,&nbsp;Jorge Luis Palomino Tamayo","doi":"10.1016/j.compstruc.2025.107823","DOIUrl":"10.1016/j.compstruc.2025.107823","url":null,"abstract":"<div><div>In this paper, a novel multi-material topology optimization method based on Bidirectional Evolutionary Structural Optimization (BESO) is proposed. The method employs a two-loop approach to optimize two-pile cap structures. The first loop focuses on minimizing structural compliance, thereby reducing the structure’s weight for a given material volume constraint. In the second loop, concrete elements exceeding their strength limits are iteratively replaced with steel elements to ensure a safe stress level for the obtained topology. The steel area is determined based on the equivalent principal forces of finite elements classified as steel. To demonstrate the effectiveness of this optimization method, a comparative analysis is conducted between a two-pile cap system designed using the Strut-and-Tie method and optimized topologies with final volume fractions of 55% and 70%. The optimized two-pile cap structures are evaluated through volume and weight analysis, as well as nonlinear finite element analysis to identify potential failure modes. The obtained designs achieve the required safety level for the design load while considering manufacturing constraints and reducing concrete volume.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107823"},"PeriodicalIF":4.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rapid optimization of rocket projectile tailfins based on multi-fidelity neural networks with transfer learning","authors":"Ye Jiang ,&nbsp;Qinliu Cao ,&nbsp;Ruolin Liu ,&nbsp;Wei-Tao Wu ,&nbsp;Yong He ,&nbsp;Hongbin Yan","doi":"10.1016/j.compstruc.2025.107801","DOIUrl":"10.1016/j.compstruc.2025.107801","url":null,"abstract":"<div><div>The aerodynamic characteristics of a rocket projectile have a direct impact on its flight performance, with tailfins playing a crucial role. Optimizing the tailfin shape is therefore a key focus in rocket projectile design. However, traditional optimization methods based on computational fluid dynamics (CFD) are time-consuming and inefficient. To address this, the study introduces a multi-fidelity fully connected neural network model based on transfer learning (MFFCN-TL) and applies it to the aerodynamic optimization of a 122 mm rocket projectile. The MFFCN-TL model was pre-trained on 1100 low-fidelity CFD samples and fine-tuned with 80 high-fidelity samples to predict the lift coefficient, drag coefficient, and pressure center, with Monte Carlo Dropout used to quantify uncertainty. The prediction performance of MFFCN-TL was first evaluated against several surrogate models, followed by single-objective and multi-objective optimizations of the tailfin design. In single-objective optimization, the goal was to maximize the lift-to-drag ratio by enhancing Bayesian optimization with a heteroscedastic Gaussian process and an improved upper confidence bound acquisition function, enabling the use of model uncertainty to guide the optimization process and balance exploration and precision. Multi-objective optimization employed multi-objective Bayesian optimization (MOBO) and the non-dominated sorting genetic algorithm II (NSGA-II) to balance the lift-to-drag ratio and drag coefficient, offering comprehensive design trade-offs. The results demonstrate that MFFCN-TL achieved determination coefficients of 0.9224, 0.9912, and 0.9688 for the drag coefficient, lift coefficient, and pressure center, respectively, surpassing other models. This method increased the lift-to-drag ratio by 37%, delivering optimization results comparable to CFD-based methods, while shortening the optimization time to 17.5 days from 26.5 days required by CFD. Multi-objective optimization produced a Pareto front and were validated by CFD simulations, confirming the reliability of the model. This approach provides an efficient and reliable solution for rapid tailfin design, significantly reducing computational cost while maintaining high accuracy.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107801"},"PeriodicalIF":4.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strain sensor placement method considering operational loads for virtual sensing of structural deformation","authors":"Sungbo Lee,&nbsp;Phill-Seung Lee","doi":"10.1016/j.compstruc.2025.107763","DOIUrl":"10.1016/j.compstruc.2025.107763","url":null,"abstract":"<div><div>This paper presents a new sensor placement method for real-time virtual sensing of full-field structural deformation. Virtual sensing is a key technology for structural digital twins and structural health monitoring. In mode-based virtual sensing, the appropriate placement of a limited number of strain sensors is essential. The proposed method addresses sensor placement by calculating target strain fields from operational loads using a finite element model and determining the necessary number of basis vectors to achieve target accuracy. Among initially placed sensors, those that can estimate the target strain field with low error using the given basis vectors are selected, with additional consideration of condition numbers. The performance of the proposed method is demonstrated through various numerical examples. While existing sensor placement methods often yield inconsistent virtual sensing performance, the proposed method consistently provides reliable results across various conditions.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"315 ","pages":"Article 107763"},"PeriodicalIF":4.4,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}