Computers & Structures最新文献

{"title":"Hybrid Machine learning Techniques-Aided design of corroded reinforced concrete beams","authors":"Thuy-Anh Nguyen,&nbsp;Hai-Bang Ly","doi":"10.1016/j.compstruc.2024.107388","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107388","url":null,"abstract":"<div><p>Shear strength (SS) is an essential component in the design of reinforced concrete structural elements, particularly in severe settings where reinforcements can occur and cause a loss in SS. The purpose of this work is to develop a framework for predicting the SS and optimal design of corroded reinforced concrete (CRCo) beams by using a machine learning (ML) approach. The model employed was Gradient Boosting (CGB), optimized using three metaheuristic algorithms. By optimizing the CGB model with the Hunger Games Search (HGS) algorithm, the study achieved the best ML model for predicting the SS of CRCo beams, with an R² value of 0.996. The proposed model outperformed five other empirical SS models for CRCo beams, and sensitivity, partial dependence analyses were also conducted to explore the impact of various variables on SS. Finally, this work provided guidance on selecting appropriate beam sizes and corrosion rates for optimal CRCo beams design solutions.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140632660","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":"Algorithms to create realistic virtual asphalt mixtures","authors":"L. Wan ,&nbsp;A. Garcia-Hernández ,&nbsp;S. Dopazo-Hilario ,&nbsp;G. Cui ,&nbsp;P. Liu","doi":"10.1016/j.compstruc.2024.107391","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107391","url":null,"abstract":"<div><p>This paper presents a set of algorithms for creating realistic three-dimensional (3D) models of asphalt mixtures based on its composition. The process begins by measuring the shape of the aggregates in the asphalt mixture. Using these measurements, an algorithm creates 3D volumes that approximate the size and shape of the aggregates. These volumes are then added to a virtual mixer in the same proportions as the aggregates in the real mixture and are pressed together until the air void content of the 3D model matches that of the real asphalt. This results in realistic models of aggregate skeletons in the asphalt mixture. Next, sections are taken from the aggregate skeletons and a mortar mixture, made up of bitumen, filler and fine aggregates, is applied to the sections. Geometrical rules are used to determine which areas of the sections are covered in mortar and which are air voids. The validation of virtual aggregates and air voids has demonstrated good correlations with actual ones. The resulting models are highly realistic and can be used to predict the mechanical or physical properties of asphalt mixtures in future studies.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0045794924001202/pdfft?md5=3d21e81c0e695c9def7c3db2c37dfc22&pid=1-s2.0-S0045794924001202-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140640757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear dynamical response of sinusoidal impulsive actuated piezoelectric/porous sandwich nanoharvesters via GM-based meshfree collocation formulations","authors":"Saeid Sahmani ,&nbsp;Babak Safaei ,&nbsp;Fan Fan","doi":"10.1016/j.compstruc.2024.107389","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107389","url":null,"abstract":"<div><p>In this paper a new effective computational approach based upon a meshless collocation formulation of the Gurtin-Murdoch (GM) continuum elasticity is described. The newly developed computational model for the third-order shear flexible elastic plates is then employed to analyze the nonlinear dynamical response of piezoelectric/porous sandwich nanoharvesters subjected to a sinusoidal impulsive actuation. The material properties relevant to the porous passive core having uniform or two graded through thickness porosity dispersions are estimated using the approach of Gaussian random field. The weak form of model conception is discretized and solved numerically via employing an incorporation of the polynomial and radial basis functions having the capability to remove any feasible singularity as well as taking more precise approximation into account within the GM-based meshfree collocation formulations. It is deduced that by contemplating the surface stress tensor via the established GM-based model, the achieved voltage from the sinusoidal impulsive actuated sandwich nanoharvesters reduces, especially for those possessing lower thickness. Also, it is deduced that for the fully simply supported impulsive actuated sandwich nanoharvester, by changing the porosity decoration of distribution from the uniform decoration to FGO and FGX graded ones, the significance of the role of surface stress tensor in the achieved voltage reduces from <span><math><mrow><mn>12.45</mn><mo>%</mo></mrow></math></span> to <span><math><mrow><mn>12.28</mn><mo>%</mo></mrow></math></span>, and enhances from <span><math><mrow><mn>12.45</mn><mo>%</mo></mrow></math></span> to <span><math><mrow><mn>12.64</mn><mo>%</mo></mrow></math></span>, respectively. For the fully clamped impulsive actuated sandwich nanoharvester, by changing the porosity decoration of distribution from the uniform decoration to FGO and FGX graded ones, the significance of the role of surface stress tensor in the achieved voltage reduces from <span><math><mrow><mn>15.01</mn><mo>%</mo></mrow></math></span> to <span><math><mrow><mn>14.68</mn><mo>%</mo></mrow></math></span>, and enhances from <span><math><mrow><mn>15.01</mn><mo>%</mo></mrow></math></span> to <span><math><mrow><mn>15.37</mn><mo>%</mo></mrow></math></span>, respectively.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140631385","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":"Efficient dynamic topology optimization of 2D metamaterials based on a complementary energy formulation","authors":"Raj Pradip Khawale ,&nbsp;Suparno Bhattacharyya ,&nbsp;Rahul Rai ,&nbsp;Gary F. Dargush","doi":"10.1016/j.compstruc.2024.107371","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107371","url":null,"abstract":"<div><p>The advent of additive manufacturing has revolutionized the design and development of hierarchical structures, with potential applications in compliant, auxetic, and band-gap structures. This paper presents an innovative approach to developing a dynamic Topology Optimization (TO) framework for designing printable lattice structures that exhibit specific dynamic properties. Utilizing parametrically defined filament-based unit cell structures for topology optimization, we achieve desired natural frequency bandgaps in the structures composed of these unit cells. To enhance computational efficiency, we employ a complementary energy-based formulation to (semi)analytically derive the flexibility and stiffness matrices of the unit cell structure, thus, eliminating extensive finite element discretization. Consequently, a wide variety of parametrically defined filament-based meso-structures can be mathematically explored. We apply this innovative framework specifically for band-gap maximization of 2D lattice structures. By tuning the geometry within each cell using TO, we maximize the band gap. Our results show the potential of this approach to create more efficient and effective hierarchical structures with desired band-gap properties.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140620046","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":"Asymptotically accurate and locking-free finite element implementation of first order shear deformation theory for plates","authors":"K.C. Le ,&nbsp;H.-G. Bui","doi":"10.1016/j.compstruc.2024.107387","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107387","url":null,"abstract":"<div><p>A formulation of the asymptotically exact first-order shear deformation theory for linear-elastic homogeneous plates in the rescaled coordinates and rotation angles is considered. This allows the development of its asymptotically accurate and shear-locking-free finite element implementation. As applications, numerical simulations are performed for circular and rectangular plates, showing complete agreement between the analytical solution and the numerical solutions based on two-dimensional theory and three-dimensional elasticity theory.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140619013","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 and efficient computational peridynamic framework for modeling explosive blast effects on solid plates","authors":"D.A. Abdoh","doi":"10.1016/j.compstruc.2024.107381","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107381","url":null,"abstract":"<div><p>The paper presents a novel and efficient model to examine deformations and fractures in solid plates when exposed to explosive blast events under various scenarios and boundary conditions. The proposed model uses the peridynamic method to simulate the motion and damage of solid plate particles during explosions in a mesh-free scheme. The model’s validation with experimental results is essential to ensure that the proposed model can capture the actual behavior of solid plates in explosive blasts. The present study shows the following novelties: (1) A novel coupling strategy is presented, which integrates explosive blast loadings with the peridynamic method. Therefore, the model becomes capable of effectively capturing the interactions between explosive blasts and solid plates; (2) The proposed model demonstrates remarkable stability in modeling explosive blasts on solid plates, and it does not require refinement schemes nor adaptive modeling parameters such as adaptive timestep; (3) The peridynamic model overcomes the mesh-distortion issues commonly encountered in mesh-based models, particularly under extreme loading conditions; (4) The proposed model exhibits high efficiency, enabling fast and accurate simulations of solid plate behavior under explosive blast scenarios. The paper also presents a new parametric study that explores the failure behavior of solid plates during explosions.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140557998","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 displacement-based finite element formulation for solving elastic wave problems in coupled fluid-solid media on a GPU","authors":"Yiannis Simillides ,&nbsp;Peter Huthwaite ,&nbsp;Michał K. Kalkowski ,&nbsp;Michael J.S. Lowe","doi":"10.1016/j.compstruc.2024.107369","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107369","url":null,"abstract":"<div><p>Ultrasonic wave propagation and scattering involving both solids and fluids underpins many key configurations in non-destructive testing and underwater acoustics. The resulting interactions are highly dependent on both material parameters and geometries and are difficult and expensive to investigate experimentally. Modelling capabilities are often used to overcome this, but these are also complex and computationally expensive due to the complexity of the fluid-solid interactions. We introduce a novel explicit time-domain finite element method for simulating ultrasonic waves interacting with fluid-solid interfaces. The method is displacement-based, and relies on classical hourglassing control, in addition to a modified time-stepping scheme to damping out shear motion in an inviscid fluid. One of the key benefits of the displacement-based approach is that nodes in the fluid have the same number of degrees of freedom as those in the solid. Therefore defining a fluid-solid model is as easy as defining an all-fluid or all-solid model, avoiding the need for any special treatments at the interfaces. It is thus compatible with typical elastodynamic finite element formulations and ready for implementation on a graphical processing unit. We verified the method across a range of problems involving millions of degrees of freedom in fields such as non-destructive testing and underwater acoustics.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0045794924000981/pdfft?md5=ea76e88206bc5534a385227b3543a0f0&pid=1-s2.0-S0045794924000981-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140554756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Toward static and transient stress-constrained topology optimization for shell-infill structures","authors":"Chao Wang ,&nbsp;Yi Wu","doi":"10.1016/j.compstruc.2024.107370","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107370","url":null,"abstract":"<div><p>This paper contributes to a stress-constrained topology optimization approach for the design of shell-infill structures. Based on the density method, we utilize the two-step filtering and projection scheme and local volume constraint for generating the shell and non-uniform infills, respectively. The topology optimization formulation is defined as a Robust Minimum Compliance problem with Volume and Stress constraints (RMCVS), where the robust method is used to eliminate undesired topological characteristics. We globalize the static and transient stress constraints through the p-norm function, and tailor material interpolation and stress relaxation schemes for both cases, respectively, to avoid numerical difficulties. Sensitivity analysis is provided, and the derivatives of the objective function and constraints with respect to the design variable fields are derived. We then validate the suggested method through several 2D and 3D benchmarks. The results illustrate that the method is robust to generate various shell-infill structures while limiting the maximum static and transient stress.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140551213","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 hyperspherical cap area integral method for reliability analysis","authors":"Zhenzhong Chen ,&nbsp;Haoxun Mu ,&nbsp;Xiaoke Li ,&nbsp;Ge Chen ,&nbsp;Xuehui Gan","doi":"10.1016/j.compstruc.2024.107372","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107372","url":null,"abstract":"<div><p>In the second-order reliability method, the failure surface consisting of random variables is approximated as a paraboloid in standard normal space. The principal curvatures of the paraboloid are obtained by processing the Hessian matrix to compute the failure probability. However, Breitung's approximate formulation is not always accurate for the reliability problem with the highly nonlinear failure surface. In this paper, based on the approximated paraboloid, a hyperspherical cap area integral method (HCAIM) is presented to improve the accuracy with consistent efficiency. In HCAIM, the hyperspherical cap area expression is combined with the integral method, thus converting the multidimensional failure probability expression into a one-dimensional integral equation to solve for the failure probability of a paraboloid of revolution. An equivalent probability formula is proposed that replaces the failure probability of an elliptic paraboloid with the failure probabilities of multiple paraboloids of revolution. The performance of HCAIM is demonstrated by examples and compared with other methods. The results show that the proposed HCAIM is robust and accurate.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140543121","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 new rational approach to multi-input multi-output 3D topology optimization","authors":"P. Venini","doi":"10.1016/j.compstruc.2024.107362","DOIUrl":"https://doi.org/10.1016/j.compstruc.2024.107362","url":null,"abstract":"<div><p>A new 3D topology optimization approach is presented that is based on the singular value decomposition of the input/output transfer matrix of the system. To start with, the input and output vectors, i.e. the acting loads and the quantities of interest for the designer, are chosen and the input-output transfer matrix is derived. Such matrix, say <span><math><mi>G</mi><mo>(</mo><mi>p</mi><mo>)</mo></math></span>, depends on the vector of the design variables <strong><em>p</em></strong> (the densities at the element level). The singular value decomposition of <span><math><mi>G</mi><mo>(</mo><mi>p</mi><mo>)</mo></math></span> is the core of the proposed approach. It provides singular values as well as left and right singular vectors. Singular values are shown to uniquely define a few matrix norms that can be conveniently computed and used as goal functions to be minimized. Left and right singular vectors respectively represent the principal input/output pairs of the system whose gain is the associated singular value. Numerical optimization is pursued via the method of moving asymptotes (MMA) <span>[1]</span> that calls for the semi-analytic computations of objective functions and constraints. The results of a few 3D numerical investigations are presented and discussed in much detail. An in-house Matlab code developed for the sake of this paper, and based on the ones presented in <span>[2]</span> and <span>[3]</span>, is provided in full as an Appendix to the paper.</p></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140535068","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}