Computers & Structures最新文献_第2页

Offline iteration-based real-time hybrid simulation for high-fidelity fluid-structure dynamic interaction in structures subjected to seismic excitation 基于离线迭代的实时混合模拟，用于受地震激励结构中的高保真流固动力相互作用

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-11-04 DOI: 10.1016/j.compstruc.2024.107579

Yuchen Hu , Yafei Zhang , Zihao Zhou , Ning Li , Dan Zhang

{"title":"Offline iteration-based real-time hybrid simulation for high-fidelity fluid-structure dynamic interaction in structures subjected to seismic excitation","authors":"Yuchen Hu , Yafei Zhang , Zihao Zhou , Ning Li , Dan Zhang","doi":"10.1016/j.compstruc.2024.107579","DOIUrl":"10.1016/j.compstruc.2024.107579","url":null,"abstract":"<div><div>This study introduces an offline iteration-based real-time hybrid simulation (OI-RTHS) method, a novel approach for simulating fluid–structure dynamic interaction (FSDI) under seismic excitation. With this method, hydrodynamic forces are treated as a physical substructure, while numerical computation and servo loading are performed independently throughout the entire duration of the seismic event. By iteratively correcting the input command signals and obtaining the output response signals during each iteration process, they can eventually achieve balanced coordination at the boundaries. This characteristic introduces real hydrodynamic data to address the limitations of purely numerical theoretical analysis, ensuring high fidelity. Additionally, it reduces the need for real-time communication between numerical computation and servo loading, thereby reducing hardware and software requirements. In this study, experimental verification of the proposed method is conducted, and the results illustrate that the method can address the convergence issue of dynamic response for FSDI of structures in the water after a finite number of iterations. Moreover, regarding the hydrodynamic force as a physical substructure helps prevent errors arising from repeated loading processes, enabling the benefits of the OI-RTHS method. This study offers potential insights for the research on the FSDI of structures, also other environmental loadings.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"305 ","pages":"Article 107579"},"PeriodicalIF":4.4,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578266","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

Digital twins-boosted identification of bridge vehicle loads integrating video and physics 整合视频和物理的数字双胞胎增强型桥梁车辆荷载识别技术

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-11-04 DOI: 10.1016/j.compstruc.2024.107578

Junyi Tang , Junlin Heng , Lin Feng , Zhongru Yu , Zhixiang Zhou , Charalampos Baniotopoulos

{"title":"Digital twins-boosted identification of bridge vehicle loads integrating video and physics","authors":"Junyi Tang , Junlin Heng , Lin Feng , Zhongru Yu , Zhixiang Zhou , Charalampos Baniotopoulos","doi":"10.1016/j.compstruc.2024.107578","DOIUrl":"10.1016/j.compstruc.2024.107578","url":null,"abstract":"<div><div>Traffic loads are very critical in bridge digital twins for assessing the deterioration state and structural integrity of road bridges. The existing load rating methods are complicated and time-consuming, necessitating more efficient and intelligent approaches to identify and evaluate safe load capacities. This paper presents a digital twins-boosted approach to identify vehicle loads on road bridges by integrating video records and related physic information. The convolutional neural network (CNN) is adapted with a proposed pixel scale factor (PSF) method to track the motion and dimension of vehicles crossing the bridge. Based on the tracked vehicle data, the time-dependent traffic flow is regenerated via traffic simulation models. Due to the correlation in vehicle loads within a road network, the detailed weight of each vehicle in the traffic flow is inferred using related vehicle load models, e.g., the model established from nearby tollgate data in the case study. After a preliminary verification in the laboratory, a field trial test is carried out to validate the proposed approach in identifying the traffic flow. Then, finite element (FE) simulations are integrated into the approach to predict the vehicle-inducted structural response of an urban arch bridge. The prediction shows a satisfying agreement with the measurement by sensors, which validates the proposed approach in identifying traffic loads. Moreover, compared with purely data-driven methods, the proposed approach demands less training effort and provides more details due to the integration of physics. In general, the output not only offers a promising solution for the digital twins of traffic loads at low costs, but also highlights the integration of visual data and physics in solving engineering issues.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"305 ","pages":"Article 107578"},"PeriodicalIF":4.4,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578265","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 novel modular origami strategy: Achieving adjustable Poisson’s ratio and tunable distinctive mechanical properties for versatile applications 新颖的模块化折纸策略：实现可调节的泊松比和可调整的独特机械特性，满足多种应用需求

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-11-02 DOI: 10.1016/j.compstruc.2024.107566

Yongtao Bai , Chen Chen , Yao Chen , Ruining Zhu

{"title":"A novel modular origami strategy: Achieving adjustable Poisson’s ratio and tunable distinctive mechanical properties for versatile applications","authors":"Yongtao Bai , Chen Chen , Yao Chen , Ruining Zhu","doi":"10.1016/j.compstruc.2024.107566","DOIUrl":"10.1016/j.compstruc.2024.107566","url":null,"abstract":"<div><div>The exigencies of intricate environments necessitate the conception of structures exhibiting extraordinary performance. In response, we devised a foldable modular origami structure by combining Miura-Origami and perforated plates, employing a novel design strategy. We substantiated that this structure manifests adjustable Poisson’s ratios in diverse directions, spanning from negative values to positive, and can even approach infinity. While singular modular origami structures demonstrate inferior performance compared to periodic configurations, our focus has shifted to a more comprehensive analysis. Therefore, we conducted finite element analyses to scrutinize the mechanical behavior of periodically arranged modular origami structures. Remarkably, the same structure can exhibit either analogous or entirely disparate mechanical properties in distinct folding states. The inherent variability in Poisson’s ratio and mechanical performance opens new possibilities for applications in prospective complex environments, such as unfolding thin-walled structures, structural load-bearing, energy absorption, and so forth.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"305 ","pages":"Article 107566"},"PeriodicalIF":4.4,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573315","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

Stress-constrained topology optimization using the velocity field level set method 利用速度场水平集法进行应力约束拓扑优化

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-11-02 DOI: 10.1016/j.compstruc.2024.107577

Wei Cheng , Xiaopeng Zhang , Tiannan Hu , Jing Li , Yaguang Wang

{"title":"Stress-constrained topology optimization using the velocity field level set method","authors":"Wei Cheng , Xiaopeng Zhang , Tiannan Hu , Jing Li , Yaguang Wang","doi":"10.1016/j.compstruc.2024.107577","DOIUrl":"10.1016/j.compstruc.2024.107577","url":null,"abstract":"<div><div>This paper proposes a stress-constrained structural topology optimization method in the velocity field level set framework. To avoid the strength failure in structures, the stress should meet certain strength criteria at all material points. This point-wise constraint brings great difficulty to topology optimization. Instead of using the traditional aggregation scheme, we propose a new stress constraint in the single domain integral form, which is mathematically equivalent to the point-wise stress limitation and enables the precise stress control throughout the entire material domain without introducing numerous constraints. Its simple expression with relatively low non-linearity facilitates the optimization formulation, the sensitivity analysis and the numerical implementation. Here, the velocity field level set method is used for the stress-constraint topology optimization. The implicit material representation by the level set model is combined with the body-fitted mesh, which provides a clear and smooth material boundary with high numerical calculation accuracy for the stress and the sensitivity. Moreover, the velocity field level set method maps the original boundary variation-based optimization problem from the functional design space into a finite-dimensional one by introducing the velocity field design variables. Thus, it allows using of the general mathematical optimization algorithms in the level set model, which provides an efficient and steady way to deal with the stress-constrained optimization problems.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"305 ","pages":"Article 107577"},"PeriodicalIF":4.4,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573316","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

Optimal thickness distribution design for blending hybrid composite laminates using Buckling Factor and Failure Index prediction 利用屈曲因子和失效指数预测进行混合混合复合材料层压板的最佳厚度分布设计

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-31 DOI: 10.1016/j.compstruc.2024.107562

Thanh N. Huynh, Jaehong Lee

{"title":"Optimal thickness distribution design for blending hybrid composite laminates using Buckling Factor and Failure Index prediction","authors":"Thanh N. Huynh, Jaehong Lee","doi":"10.1016/j.compstruc.2024.107562","DOIUrl":"10.1016/j.compstruc.2024.107562","url":null,"abstract":"<div><div>This article introduces an extension to the Optimal Thickness Prediction (OTP) approach for solving the hybrid material composite laminate blending optimization problem considering both Buckling Factor and Failure Index constraints. The proposed optimization approach solves the blending optimization problem with a two-stage procedure. The Stacking Sequence of the laminate is first optimized using optimization algorithms, and then utilized as the input for the CNN-based prediction model to predict the corresponding optimal regional thickness. The present extended approach expands the dimension capacity of the OTP model by including an additional laminate material input dimension and Failure Index output dimension. The additional features broaden the scope of the OTP model to simultaneously handle more design variables and constraints. An integration of the proposed approach with a lamination guideline-based Genetic Algorithm is presented. A hybrid material variation of the 18-panel horseshoe blending optimization problem is introduced and utilized for demonstration of the effectiveness of the proposed approach. The obtained result highlights the significant improvement in performance of the integrated method over the base algorithm.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"305 ","pages":"Article 107562"},"PeriodicalIF":4.4,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554134","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 asymmetric pinching damaged hysteresis model for glubam members: Parameter identification and model comparison 胶合构件的非对称捏合损坏滞后模型：参数识别和模型比较

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-31 DOI: 10.1016/j.compstruc.2024.107574

Da Shi , Cristoforo Demartino , Giuseppe Carlo Marano , Yongjia Xu

{"title":"An asymmetric pinching damaged hysteresis model for glubam members: Parameter identification and model comparison","authors":"Da Shi , Cristoforo Demartino , Giuseppe Carlo Marano , Yongjia Xu","doi":"10.1016/j.compstruc.2024.107574","DOIUrl":"10.1016/j.compstruc.2024.107574","url":null,"abstract":"<div><div>The performance of glue laminated bamboo (glubam) members is governed by the nonlinear response at their joints, where high deformation levels and stress concentrations are developed. Numerous phenomenological models are presently employed to describe the hysteresis behavior of these joints, while these models always have an excessive number of parameters, and the physical interpretation of these parameters is often challenging. Moreover, some hysteresis models cannot capture all hysteresis features such as asymmetry, pinching, and damage. Consequently, this paper introduces a novel phenomenological-based hysteretic model named Asymmetric Pinching Damaged (APD) model, and implemented it in Abaqus by combining connector and spring elements in series or parallel. This model encompasses asymmetry, pinching, and strength degradation for bamboo joint components, with parameters that possess clear physical meanings and are readily comprehensible. This study also presented a parameter identification framework coupling the Parallel Genetic Algorithm (PGA) and Bayesian Neural Network (BNN). By merging the FE modeling and optimizing algorithms with the interactive application of ABAQUS and Python software platforms, the integrated identification framework is capable of performing multi-threaded parallel computation of finite element models considering the BNN-based uncertainty quantification, thus greatly improving the efficiency of parameter identification.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"305 ","pages":"Article 107574"},"PeriodicalIF":4.4,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560589","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

Dynamic shear modulus degradation of saturated soil analysis: From the perspective of phase field theory 饱和土壤的动态剪切模量退化分析：从相场理论的角度

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-31 DOI: 10.1016/j.compstruc.2024.107568

Yuan Yong , Sang Qiaozhi , Chen Xi

引用次数: 0

An objective minimal constraint formulation for the analysis of elastic articulated structures 用于分析弹性铰接结构的目标最小约束公式

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-30 DOI: 10.1016/j.compstruc.2024.107571

L. Greco, D. Castello, M. Cuomo

引用次数: 0

Energy-preserving matrix perturbation theory for coupling dynamic analysis of flexible structures 用于柔性结构耦合动态分析的能量守恒矩阵扰动理论

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-30 DOI: 10.1016/j.compstruc.2024.107572

Han Fei , Wu Lei , Li Shiyang , Deng Zichen , Wu Fa

{"title":"Energy-preserving matrix perturbation theory for coupling dynamic analysis of flexible structures","authors":"Han Fei , Wu Lei , Li Shiyang , Deng Zichen , Wu Fa","doi":"10.1016/j.compstruc.2024.107572","DOIUrl":"10.1016/j.compstruc.2024.107572","url":null,"abstract":"<div><div>Aiming at the reanalysis problem of time-varying eigenvalues of force-shape coupled systems, this paper proposes an energy-preserving matrix perturbation theory (EPMPT) that can maintain the essential physical properties of the system. The classical matrix perturbation method, which employs interpolated shape functions, fails to evaluate and address solution errors promptly during the continuous perturbation process. This limitation has led to the theoretical issue of “eigenvalue drift”, a flaw that has persisted in the original method since its introduction 40 years ago. In contrast, the presented method uses the dynamic stiffness method to obtain the system eigenvalues and eigenvectors at one time, and provides a perturbation solution to the time-varying eigenvalue problem. Further combined with the <em>J</em> count test technology in the Wittrick-Williams algorithm, an energy-preserving method that can “self-check and self-correct” the solution was developed. The idea that “continuous perturbation should maintain force-shape dynamic self-consistency in the frequency domain” is proposed, and avoiding the energy dispersion and resulting distortion problems caused by long-term numerical simulation. To illustrate the advantage of the EPMPT, a thermally induced vibration of an aerospace structure including force-shape coupling effect, and the vibration of a flexible space solar power arrays including rigid-flexible coupling effect are investigated. Case studied elucidates that EPMPT possesses the capability to notably enhance the computational efficiency associated with generalized eigenvalue and response reanalysis problems. When juxtaposed against conventional step-by-step integration methods, EPMPT has been found to augment computational efficiency by a margin of at least 70 %, and in some instances, up to 90 %.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"305 ","pages":"Article 107572"},"PeriodicalIF":4.4,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554132","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 parallel geometric contact algorithm for thin shell finite elements in explicit time integration 显式时间积分薄壳有限元并行几何接触算法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-30 DOI: 10.1016/j.compstruc.2024.107567

Qingquan Wang, Carlos Pantano

{"title":"A parallel geometric contact algorithm for thin shell finite elements in explicit time integration","authors":"Qingquan Wang, Carlos Pantano","doi":"10.1016/j.compstruc.2024.107567","DOIUrl":"10.1016/j.compstruc.2024.107567","url":null,"abstract":"<div><div>While numerical physical models of contact mechanics have become increasingly prevalent, the implementation of these models to efficiently resolve geometric contact with a robust contact search strategy remains lacking. Our research endeavors to address this gap by introducing a comprehensive solution with an exact geometric contact mechanics algorithm for thin shell finite elements with an explicit time scheme. The method has several key features, including precise geometrical resolution of self-contact interactions enabled by a sub-time-step marching method, adaptive data structures to minimize computational overhead, and a dedicated parallelization implementation with load-balancing capability. An efficient detection algorithm is implemented to reduce the natural polynomial time complexity of the problem by decomposing it into two phases: global and local phase contact detection. The impact equations are then applied to resolve the contact event by enforcing the conservation of kinematic energy and momentum. This contact algorithm is fully integrated with the MPI-based parallelization of the thin-shell finite element solver to ensure even load-balancing. The robustness and correctness of the algorithm is demonstrated in three numerical studies. Additionally, a strong scaling study showcases the scalability of the parallelization associated with the algorithm.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":"305 ","pages":"Article 107567"},"PeriodicalIF":4.4,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554133","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