Computers & Structures最新文献_第8页

Multi-agent deep reinforcement learning for resilience optimization of building structures considering utility interactions for functionality

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-22 DOI: 10.1016/j.compstruc.2025.107703

Ghazanfar Ali Anwar , Muhammad Zeshan Akber

{"title":"Multi-agent deep reinforcement learning for resilience optimization of building structures considering utility interactions for functionality","authors":"Ghazanfar Ali Anwar , Muhammad Zeshan Akber","doi":"10.1016/j.compstruc.2025.107703","DOIUrl":"10.1016/j.compstruc.2025.107703","url":null,"abstract":"<div><div>The resilience optimization of the built environment under extreme events with building structures and interdependent physical infrastructure systems is inefficient due to the large action spaces of pre-hazard mitigation alternatives. Hence, a Multi-Agent Deep Deterministic Policy Gradient (MADDPG) based resilience optimization framework is proposed herein to enhance the resilience of the built environment with large mitigation action spaces. The proposed framework is divided into two parts including (1) Performance-Based Environment (PBE) to assess the resilience of the building structures under given hazard scenarios considering dependencies and interdependencies of the physical infrastructure systems, and (2) MADDPG for resilience optimization of the interdependent building structures given minimal mitigation and repair costs. The PBE is developed to assess the consequences of the mitigation actions under hazard by utilizing steps including component consequence and recovery assessment, network modeling and functionality assessment, and portfolio consequence and resilience assessment. The multi-agents for resilience optimization utilize Deep Deterministic Policy Gradients (DDPG) including actor and critic networks to learn to optimize the mitigation actions by maximizing the cumulative reward function given the hazard scenarios. The proposed framework is illustrated on a built environment with building structures and two physical infrastructure systems including a Water Network (WN) and an Electrical Power Network (EPN) system. The provided framework efficiently optimizes complex, interdependent, and large infrastructure systems under extreme events by utilizing physics-based environments and artificial intelligence.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107703"},"PeriodicalIF":4.4,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464293","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}

引用次数: 0

Nitsche-based isogeometric analysis of bending and free vibration of stiffened FGM plates with cutouts

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-21 DOI: 10.1016/j.compstruc.2025.107677

Yuan Wang , Fujian Si , Zhijun Zhang , Chaofeng Pan , Wangfan Zhou , Heng Gu , Jiangping Xu , Hao Zhu

{"title":"Nitsche-based isogeometric analysis of bending and free vibration of stiffened FGM plates with cutouts","authors":"Yuan Wang , Fujian Si , Zhijun Zhang , Chaofeng Pan , Wangfan Zhou , Heng Gu , Jiangping Xu , Hao Zhu","doi":"10.1016/j.compstruc.2025.107677","DOIUrl":"10.1016/j.compstruc.2025.107677","url":null,"abstract":"<div><div>We have developed a coupled framework of Nitsche and isogeometric analysis for investigating the static bending and natural vibration of functionally graded material (FGM) plates reinforced with stiffeners and cutouts. The FGM plates are discretized using non-overlapping non-uniform rational B-splines (NURBS) patches, with stiffeners strategically positioned along the shared edges of neighboring patches. Consequently, the Nitsche technique is adopted to integrate these patches seamlessly. Our methodology, which combines the first-order shear deformation theory (FSDT) and Timoshenko beam theory, is utilized to examine the static bending and natural vibration of the perforated stiffened FGM plates. This approach eliminates the need for stiffener discretization and the localization of FGM plate elements at stiffener nodes. Initially, the convergence and accuracy of the present method are verified by the bending of an unstiffened FGM plate and free vibration of a stiffened FGM plate, respectively. Subsequently, the static bending behaviors of FGM plates are investigated by uniform and nonuniform loads, diverse gradient indices, and variable plate thicknesses. Furthermore, a thorough investigation is conducted on the free vibration of rectangular, skew, and circular FGM plates, considering the cutouts and stiffeners under various boundary conditions. The corresponding results of our method coincide with available data in literature.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107677"},"PeriodicalIF":4.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454267","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}

引用次数: 0

Multiscale characterization of the mechanics of curved fibered structures with application to biological and engineered materials

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-21 DOI: 10.1016/j.compstruc.2025.107690

J.A. Sanz-Herrera, A. Apolinar-Fernandez, A. Jimenez-Aires, P. Perez-Alcantara, J. Dominguez, E. Reina-Romo

{"title":"Multiscale characterization of the mechanics of curved fibered structures with application to biological and engineered materials","authors":"J.A. Sanz-Herrera, A. Apolinar-Fernandez, A. Jimenez-Aires, P. Perez-Alcantara, J. Dominguez, E. Reina-Romo","doi":"10.1016/j.compstruc.2025.107690","DOIUrl":"10.1016/j.compstruc.2025.107690","url":null,"abstract":"<div><div>Curved fibered structures are ubiquitous in nature and the mechanical behavior of these materials is of pivotal importance in the biomechanics and mechanobiology fields. We develop a multiscale formulation to characterize the macroscopic mechanical nonlinear behavior from the microstructure of fibered matrices. From the analysis of the mechanics of a randomly curved single fiber, a fibered matrix model is built to determine the macroscopic behavior following a homogenization approach. The model is tested for tensile, compression and shear loads in different applications. The presented approach naturally recovers instabilities at compression as well as the strain stiffening regime, which are observed experimentally in the mechanical behavior of collagen matrices. Indeed, it was found that the bending energy associated to fiber unrolling, is the most important source of energy developed by fibers for the analyzed cases in tensile and shear in all deformation regions (except the strain stiffening region), whereas bending energy dominates at compression too during buckling. The proposed computational framework can also be used to perform multiscale simulations in engineered fibered materials. Therefore, the developed methodology may be an interesting and complementary tool to characterize the nonlinear behavior and evolution of curved fibered structures present in biology and engineering.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107690"},"PeriodicalIF":4.4,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454266","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}

引用次数: 0

Fast band structure prediction for phononic crystals with double−stage model reduction and wave isogeometric analysis

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-20 DOI: 10.1016/j.compstruc.2025.107694

Zhen Lei , Tengfei Liu

{"title":"Fast band structure prediction for phononic crystals with double−stage model reduction and wave isogeometric analysis","authors":"Zhen Lei , Tengfei Liu","doi":"10.1016/j.compstruc.2025.107694","DOIUrl":"10.1016/j.compstruc.2025.107694","url":null,"abstract":"<div><div>Phononic crystals (PnCs), a well−known group of artificial metamaterials that demonstrate bandgap characteristics, are commonly utilized in multiple engineering fields. However, its design often faces the computational challenge of iterative band structure calculations, retarding the invention of new PnCs. In order to speed up the computation of band structures, this paper introduces a novel numerical method called double−stage reduced wave isogeometric analysis (DRWIGA). Isogeometric analysis is adopted to precisely describe the cell's geometry during modeling and analysis. The reduced−order model is obtained from a single cell undergoing a two−step reduction process: inner mode and boundary mode reduction. This significantly reduces the dimension of the problem, thereby expediting the calculation of band structures. The proposed method's efficiency and effectiveness are demonstrated by classic benchmark problems. This approach achieves a 94% decrease in model size for 2D PnCs, along with an impressive 99.7% reduction in CPU time for slowness surface calculations. It accelerates the bandgap optimization of PnCs and fosters novel metamaterial designs.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107694"},"PeriodicalIF":4.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445531","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}

引用次数: 0

A deep learning-based method for full-bridge flutter analysis considering aerodynamic and geometric nonlinearities

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-19 DOI: 10.1016/j.compstruc.2025.107693

Wen-ming Zhang , Dan-dian Feng , Li-ming Zhao , Yao-jun Ge

{"title":"A deep learning-based method for full-bridge flutter analysis considering aerodynamic and geometric nonlinearities","authors":"Wen-ming Zhang , Dan-dian Feng , Li-ming Zhao , Yao-jun Ge","doi":"10.1016/j.compstruc.2025.107693","DOIUrl":"10.1016/j.compstruc.2025.107693","url":null,"abstract":"<div><div>The nonlinearity effect grows with the span length of the bridge. Traditional linear flutter analysis methods are gradually unable to meet research and design needs. This study proposed a time-domain nonlinear method for the 3D full-bridge flutter analysis based on deep learning. It considered multiple effects including aerostatic effect, as well as aerodynamic and geometric nonlinearities of the structure. Firstly, a nonlinear reduced-order aerodynamic model was constructed for the bridge deck section based on the long short-term memory (LSTM) network. The section displacement was the input, and the aerodynamic force was the output. The aerodynamic data were obtained from CFD numerical simulation of forced vibration. Next, the 3D full-bridge flutter analysis framework was constructed. The aerodynamic forces predicted by the reduced-order model were imposed as concentrated forces on the deck nodes of bridge finite element model. The restart technique was implemented to achieve the dynamic iterative calculation. The influence of the initial excitation caused by the static wind effect on the vibration mode was eliminated by changing Rayleigh damping to make the bridge reaches the static wind equilibrium state in advance. Finally, a case study on a triple-tower suspension bridge was performed. The nonlinear flutter phenomenon observed in the full-bridge model wind tunnel test was reproduced using the proposed method. The influence of geometric nonlinearity on the flutter phenomenon was analyzed. This study provides an important reference for accurately evaluating the nonlinear flutter performance of bridges and further improving their anti-wind performance.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107693"},"PeriodicalIF":4.4,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436862","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}

引用次数: 0

A CFD-FEM-IBM simulation scheme for the strong coupling between the fluid and the structure with large deformations and movements

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-18 DOI: 10.1016/j.compstruc.2025.107673

Jia Mao , Feng Li , Shuhe Wang , Lanhao Zhao , Yingtang Di

{"title":"A CFD-FEM-IBM simulation scheme for the strong coupling between the fluid and the structure with large deformations and movements","authors":"Jia Mao , Feng Li , Shuhe Wang , Lanhao Zhao , Yingtang Di","doi":"10.1016/j.compstruc.2025.107673","DOIUrl":"10.1016/j.compstruc.2025.107673","url":null,"abstract":"<div><div>To describe the strong coupling between the fluid and the elastic structure with drastic deformations and large movements, a CFD-FEM-IBM simulation scheme is proposed. The fluid dynamics are governed by the Navier-Stokes equations, while the highly nonlinear mechanical behavior of the deformable structure is simulated using the updated Lagrangian incremental description. An outstanding feature of the hybrid method is that both the computational fluid dynamics and the computational solid dynamics are discretized spatially in the finite element framework. Besides, the main challenge in simulating strong coupling effects accurately lies in describing the fluid–structure boundary which deforms drastically over time. The direct-forcing immersed boundary method is employed to tackle the fluid–structure interaction and immersed boundary points allocated on the deformable surface of the structure are used to represent the fluid–structure interface. Both the no-slip boundary condition and the divergence-free condition for the IBM are ensured thorough several iterations. Moreover, the partitioned approach is utilized to solve the coupling system and iterations are carried out at each time step to reflect strong coupling effects. The reliability and accuracy of the current method in simulating the fluid–structure interaction problems with large deformations and movements are finally validated by benchmark tests.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107673"},"PeriodicalIF":4.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427803","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}

引用次数: 0

An indirect harmonic balance method based on frequency response functions simplification for periodical response analysis of local nonlinearity systems

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-18 DOI: 10.1016/j.compstruc.2025.107663

Ning Chen , Shuqian Cao , Yuanhang Hou

{"title":"An indirect harmonic balance method based on frequency response functions simplification for periodical response analysis of local nonlinearity systems","authors":"Ning Chen , Shuqian Cao , Yuanhang Hou","doi":"10.1016/j.compstruc.2025.107663","DOIUrl":"10.1016/j.compstruc.2025.107663","url":null,"abstract":"<div><div>The majority of the nonlinear factors introduced into engineering tend to exhibit locality rather than globality. This paper proposed a novel indirect-HBM (indirect Harmonic Balance Method) based on the perspective of local nonlinearity. The excellent performance of this method stems from its HE (Harmonic Equation). The indirect-HE (HEs of the Indirect-HBM) were composed of the FRF (Frequency Response Function) directly and it can be subdivided into Key-HEs and Aug-HEs (Augmented HE). Here, the Key-HE serves efficient computation, while Aug-HE meets various engineering needs. In this research, a FEM(Finite Element Medel) with one cube nonlinear and an infinite dimension rotor system with gap nonlinearity was employed to investigate the computational performance. First, the accuracy of indirect-HBM was verified by the numerical solution based on the 32-DOF FEM. Then, compared with the classical HBM, its computational efficiency can not be constrained by DOFs. Finally, It was applied in an infinite-dimension nonlinear rotor system, which implemented a solution based on PDE rather than ODE. The numerical solutions based on different FEMs prove that the indirect-HBM has the fidelity of the dynamic model. From the perspective of local nonlinearity, the indirect-HBM offers a novel solution approach and excellent computational performance.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107663"},"PeriodicalIF":4.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436861","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}

引用次数: 0

Explicit phase field generalized interpolation material point method for dynamic fracture problems

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-17 DOI: 10.1016/j.compstruc.2025.107685

Chi Lv, Xiao-Ping Zhou

引用次数: 0

An optimised multi-level method for the pushover analysis of historic masonry structures accounting for the actual masonry pattern

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-17 DOI: 10.1016/j.compstruc.2025.107656

Simon Szabó , Marco Francesco Funari , Antonio Maria D’Altri , Stefano de Miranda , Paulo B. Lourenço

{"title":"An optimised multi-level method for the pushover analysis of historic masonry structures accounting for the actual masonry pattern","authors":"Simon Szabó , Marco Francesco Funari , Antonio Maria D’Altri , Stefano de Miranda , Paulo B. Lourenço","doi":"10.1016/j.compstruc.2025.107656","DOIUrl":"10.1016/j.compstruc.2025.107656","url":null,"abstract":"<div><div>In this paper, we propose an optimised multi-level method to efficiently account for the actual masonry pattern in the pushover analysis of historic masonry structures. The method begins with a rigid block-based limit analysis accounting for the actual masonry pattern to identify realistic failure mechanisms. Next, macro-blocks that outline the failure mechanism are identified using a novel optimised procedure that includes a heuristic search, which minimises the number of blocks and non-linear interfaces in the subsequent analyses. Subsequently, macro-blocks are modelled as homogeneous material interacting via cohesive-frictional interfaces in a finite element environment where pushover analysis produces force–displacement curves. Validation against various structural benchmarks with regular and irregular masonry patterns and different loading configurations demonstrates the method’s accuracy and competitiveness compared to micro-modelling approaches. Results show up to a 90% reduction in computational time and the number of blocks, with a maximum difference of about 5% in numerical prediction of force capacity.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"310 ","pages":"Article 107656"},"PeriodicalIF":4.4,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422350","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}

引用次数: 0

An explicit ABAQUS toolbox for soil-structure interaction analysis in localized regions

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2025-02-14 DOI: 10.1016/j.compstruc.2025.107675

Pengfa Zhou , Yusheng Shen , Haifeng Huang , Deng Gao , Xi Zhang , Bo Gao , Ruibin Hou

{"title":"An explicit ABAQUS toolbox for soil-structure interaction analysis in localized regions","authors":"Pengfa Zhou , Yusheng Shen , Haifeng Huang , Deng Gao , Xi Zhang , Bo Gao , Ruibin Hou","doi":"10.1016/j.compstruc.2025.107675","DOIUrl":"10.1016/j.compstruc.2025.107675","url":null,"abstract":"<div><div>The numerical simulation of soil-structure interaction (SSI) in unbounded media requires truncating the semi-infinite domain to create a finite computational domain. Consequently, absorbing boundary conditions (ABCs) and seismic input methods emerge as pivotal challenges. Currently, two technologies, the perfectly matched layers (PMLs) and the domain reduction method (DRM), are robust solutions to address these challenges. However, only a limited number of studies, all using implicit algorithms, have explored its application, which exhibits significant drawbacks in large-scale computations. An explicit dynamic analysis is computationally efficient for the large-scale simulations with relatively short dynamic response times and for the analysis of extremely discontinuous events. To this end, we propose an explicit formulation of the Perfectly Matched Layer (PML) based on an extended central difference method. We implement the formulation in ABAQUS/EXPLICIT through the user-defined element (VUEL) subroutine and the user predefined field (VUFIELD) subroutine. Meanwhile, we implement the DRM by developing a Python package to calculate equivalent nodal forces. Finally, several numerical experiments in the time domain demonstrate the accuracy and stability of these implementations for both 2D and 3D domains.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"309 ","pages":"Article 107675"},"PeriodicalIF":4.4,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419102","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}

引用次数: 0