Computers & Structures最新文献_第2页

Automatic yield-line analysis of out-of-plane loaded masonry cladding panels 平面外荷载砌体覆面板的自动屈服线分析

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-23 DOI: 10.1016/j.compstruc.2024.107563

{"title":"Automatic yield-line analysis of out-of-plane loaded masonry cladding panels","authors":"","doi":"10.1016/j.compstruc.2024.107563","DOIUrl":"10.1016/j.compstruc.2024.107563","url":null,"abstract":"<div><div>To design out-of-plane loaded masonry cladding panels, as well as modern non-loadbearing masonry panels, the yield-line method has become widely used by engineers, and features in various design codes. However, the traditional hand-based yield-line analysis method can be challenging to apply to complex or irregular shapes, since the form of the critical yield-line pattern will generally not be known in advance. The discontinuity layout optimization (DLO) procedure, previously applied to reinforced concrete slabs, is here extended to treat masonry wall panels, with (i) the flexural moment capacity modified to take account of vertical dead loads from above; and (ii) shear failure also modelled, if critical (e.g., at damp proof course level). A key benefit of DLO is that the critical yield-line pattern can be identified automatically, with a rigorous linear programming-based formulation employed to ensure that a globally optimal solution is obtained for any given numerical discretization. Given the power of modern desktop PCs, this effectively eliminates the possibility of the critical yield-line failure mechanism being missed, allowing the presented method to be applied with confidence to both regular and complex-shaped masonry panels. A range of examples are used to demonstrate the efficacy of the approach, with solutions compared with those from analytical models and experimental tests.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142529698","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}

引用次数: 0

3D limit analysis of reinforced concrete with sliding along smeared cracks 钢筋混凝土沿抹灰裂缝滑动的三维极限分析

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-18 DOI: 10.1016/j.compstruc.2024.107561

{"title":"3D limit analysis of reinforced concrete with sliding along smeared cracks","authors":"","doi":"10.1016/j.compstruc.2024.107561","DOIUrl":"10.1016/j.compstruc.2024.107561","url":null,"abstract":"<div><div>Limit analysis (LA) is successfully used for investigating the bearing capacity of reinforced concrete (RC) structures. Some cautions must be taken when using this method for RC since the concrete component exhibits a softening behavior with decreasing strength and limited ductility. A commonly adopted provision consists of considering isotropic reduced values of concrete strength to be input in the analysis (empirical effectiveness factors). In this paper, an alternative and completely new approach is proposed and investigated in which concrete strength is weakened in a more targeted manner. To that purpose, the commonly used 3D truncated Mohr-Coulomb (TMC) criterion is adopted to classically describe the compressive, tensile, and shear failure of concrete. However, TMC is here in an original way enriched by additional constraints that allow to account for weakness and anisotropy induced by preferential failure patterns, assumed a priori. The limit analysis approach is then formulated for two dual analyses in the convex optimization framework, making it possible to quantify the numerical error and obtain a lower and an upper bound of the limit load. Numerical examples illustrate the agreement of the formulation with academic results and laboratory tests.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530130","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

Adaptive isogeometric topology optimization of shell structures based on PHT-splines 基于 PHT-样条线的壳体结构自适应等值拓扑优化

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-17 DOI: 10.1016/j.compstruc.2024.107565

{"title":"Adaptive isogeometric topology optimization of shell structures based on PHT-splines","authors":"","doi":"10.1016/j.compstruc.2024.107565","DOIUrl":"10.1016/j.compstruc.2024.107565","url":null,"abstract":"<div><div>This paper proposes an adaptive isogeometric topology optimization framework for shell structures by utilizing a continuous density field represented as Polynomial splines over Hierarchical T-meshes (PHT-splines). This framework ensures an exact representation of shell structures, eliminating the geometric inaccuracies commonly associated with topology optimization. In the meanwhile, the meshes used for design and analysis are refined adaptively and locally along the density boundary to achieve a smooth material layout with reduced degrees of freedom (DOF). The adaptive sensitivity filter is tailored to the characteristics of PHT-splines, where the filter radius is determined automatically and adaptively, without the need to specify parameters in advance. Numerical experiments conducted on various shell structures validate the efficacy of the proposed adaptive framework. In comparison with isogeometric topology optimization based on non-adaptive cases (i.e. B-splines), the proposed adaptive framework demonstrates a notable enhancement in computational efficiency, with a <span><math><mn>50</mn><mtext>%</mtext><mo>−</mo><mn>80</mn><mtext>%</mtext></math></span> reduction in running time and a <span><math><mn>30</mn><mtext>%</mtext><mo>−</mo><mn>60</mn><mtext>%</mtext></math></span> reduction in DOF. Additionally, we offer a detailed comparison between PHT-splines and other locally refinable splines in the context of shell topology optimization. Numerical experiments exhibit that the efficient and localized refinement capability of PHT-splines provides advantages in both computational efficiency and structural performance for topology optimization.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446033","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

Isogeometric topology optimization method for design with local stress constraints 针对局部应力约束设计的等几何拓扑优化方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-16 DOI: 10.1016/j.compstruc.2024.107564

{"title":"Isogeometric topology optimization method for design with local stress constraints","authors":"","doi":"10.1016/j.compstruc.2024.107564","DOIUrl":"10.1016/j.compstruc.2024.107564","url":null,"abstract":"<div><div>Engineering structures are required to meet strength conditions to ensure engineering safety, where the maximum stress level of the structure mainly characterizes the structural strength. This study proposes an isogeometric topology optimization method for the local stress-constrained design. This method establishes an optimization model with volume fraction as the objective function and maximum von Mises stress as the constraint condition. The augmented lagrangian approach is introduced to ensure that the design results satisfy stress constraints locally. To increase the convergence rate of stress-constrained topology optimization, we develop a new stress constraint function, and compare it with the other two stress constraint functions proposed by previous research. Sensitivity analysis of the local stress-constraint and volume objective based on an isogeometric topology optimization framework is systematically derived. The design result is compared with the traditional global stress minimization design through typical numerical examples. In addition, this method is extended to the three-dimensional stress-constrained topology optimization design problem that has rarely been studied in the isogeometric-analysis-based topology optimization framework. Several typical numerical examples are presented to demonstrate the method’s effectiveness. It demonstrates that the proposed method inherits the merits of the exact geometry and high-order continuity between elements of isogeometric analysis and can effectively control the maximum von Mises stress level of structures, with a faster convergence rate.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441586","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 implicit gradient-enhanced microplane damage material model in the coupled implicit MPM-FEM 耦合隐式 MPM-FEM 中的隐式梯度增强微平面损伤材料模型

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-13 DOI: 10.1016/j.compstruc.2024.107559

引用次数: 0

Adaptive isogeometric gear contact analysis: Geometry generation, truncated hierarchical B-Spline refinement and validation 自适应等距齿轮接触分析：几何生成、截断分层 B 样条细化和验证

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-13 DOI: 10.1016/j.compstruc.2024.107553

{"title":"Adaptive isogeometric gear contact analysis: Geometry generation, truncated hierarchical B-Spline refinement and validation","authors":"","doi":"10.1016/j.compstruc.2024.107553","DOIUrl":"10.1016/j.compstruc.2024.107553","url":null,"abstract":"<div><div>Gears are one of the most widely used transmission components. Their operation relies on the contact between mating gear teeth flanks for the transmission of power. Accurate prediction of the contact stresses at these regions, is crucial for the design and dimensioning of these systems. Gear design is centered around highly smooth involute curves that greatly influence their contact behaviour. In this paper, a fully adaptive isogeometric contact modelling scheme, based on hierarchical splines, is presented and applied to the simulation of gear contact problems. In particular, isogeometric simulation is performed for the modelling of mating pair of gear teeth, regarded as linearly elastic bodies. A boundary fitted B-Spline representation of the teeth is automatically generated from engineering design parameters and is used to define the initial discretisation basis. The numerical integration over the contact region is addressed using the so called, Gauss-Point to Surface formulation and a closest point projection procedure. Truncated hierarchical B-Splines are used to capture the highly localised nature of contact, while effectively reducing the number of degrees of freedom. The adaptivity is driven by the strain energy density gradient, which allows to automatically localise the mesh without <em>a priori</em> knowledge of the contact region between the teeth flanks. In our experiments we justify the choices made in different steps of our algorithm and we assess the performance of our adaptive solver with respect to classical tensor product B-Splines.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434268","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

Efficient approaches for modeling and simulating the mechanical behavior of concrete using lattice discrete particle models 利用晶格离散粒子模型建模和模拟混凝土力学行为的高效方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-09 DOI: 10.1016/j.compstruc.2024.107557

{"title":"Efficient approaches for modeling and simulating the mechanical behavior of concrete using lattice discrete particle models","authors":"","doi":"10.1016/j.compstruc.2024.107557","DOIUrl":"10.1016/j.compstruc.2024.107557","url":null,"abstract":"<div><div>Simulating the quasi-static mechanical behavior of concrete at the micro- or meso-scale, considering its heterogeneous nature, quickly becomes impractical in terms of computational cost. This manuscript explores efficient computational strategies in numerical modeling by means of the Lattice Discrete Particle Model (LDPM), a state-of-the-art approach for simulating concrete at the coarse aggregate level, emphasizing three interaction approaches. Whereas the original formulation of LDPM employs a 12-facet formulation, this research proposes a simplified interaction approach for LDPM, based on either 6-facet or edge-based interactions, designed to significantly reduce computational costs while maintaining precise predictions of the concrete fracture behavior. This approach is systematically applied to a variety of standard concrete tests, including unconfined compression, biaxial compression, triaxial compression, torsional-compressive, three-point bending, and cyclic compression loading in order to assess the predictive capabilities of the model. The efficiency and accuracy of the reduced number of interaction surfaces are critically discussed in both tensile and compressive loading conditions. The results indicate that approaches based on edge-based and 6-facet interactions substantially reduce computational costs and memory usage while providing similar results to the 12-facet model, except for unconfined compression simulations based on edge-based interaction. This research opens a promising avenue for advancing the utilization of LDPM in concrete mechanics simulations.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420390","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 efficient method for estimating building dynamic response due to train operations in tunnel considering transmission path from source to receiver 考虑到从源头到接收器的传输路径，估算隧道内列车运行引起的建筑物动态响应的有效方法

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-09 DOI: 10.1016/j.compstruc.2024.107555

{"title":"An efficient method for estimating building dynamic response due to train operations in tunnel considering transmission path from source to receiver","authors":"","doi":"10.1016/j.compstruc.2024.107555","DOIUrl":"10.1016/j.compstruc.2024.107555","url":null,"abstract":"<div><div>The paper presents an efficient method for estimating the dynamic response of buildings due to train operations in tunnel. The proposed method involves four models to consider the transmission path in the train-track-tunnel-soil-pile-building chain: the vehicle model, track-tunnel-soil model, building model, and soil-structure interaction model. A series of theoretical methods are employed, including the multibody dynamic method for wheel-rail interaction, the double Euler-Bernoulli beam method for track structures, the wave decomposition method and transfer matrix method for vibration propagation in soil, the impedance method for building vibration transmission. Validation is conducted through measurements of train-induced ground-borne vibrations and building vibrations in Guangzhou, China. The estimated vibrations demonstrated good agreement with measured vibrations, indicating the feasibility of the proposed method. Parametric studies are subsequently conducted to investigate the influence of spatial relationships between tunnel and pile on building vibrations. The presence of piles results in dissipation and attenuation of vibration energy due to the kinematic interaction. The spatial distribution of the wave field within the soil can significantly impact the coupling loss between the soil and structure. The research findings facilitate a clear comprehension of vibration transmission mechanisms from source to receiver, which are readily applicable in engineering practice for engineers.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420392","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

Fragment prediction of reinforced concrete wall under close-in explosion using Fragment Graph Network (FGN) 利用碎片图网络（FGN）预测近距离爆炸下钢筋混凝土墙的碎片情况

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-09 DOI: 10.1016/j.compstruc.2024.107556

{"title":"Fragment prediction of reinforced concrete wall under close-in explosion using Fragment Graph Network (FGN)","authors":"","doi":"10.1016/j.compstruc.2024.107556","DOIUrl":"10.1016/j.compstruc.2024.107556","url":null,"abstract":"<div><div>Reinforced concrete (RC) walls are vulnerable to severe damage under high-intensity, close-in TNT explosions. Substantial secondary fragments at high ejecting velocities could be generated from the damaged wall, posing serious threats to people, facilities and structures in the area. Predicting the blast-induced secondary fragments remains a great challenge. Traditional computational methods, such as the finite element method (FEM) or meshfree methods, are often used to predict the fragment characteristics despite their inherent problems, such as the application of erosion and predefining the weak sections in the simulation. They also require high computational power to perform the simulation, thus limiting their use in creating an adequate dataset to thoroughly analyse the characteristics of secondary fragments and the associated threats. This study employs a recently developed machine learning-based approach named Fragment Graph Network (FGN), a variant of Graph Neural Networks (GNNs), to generate a large dataset of fragment characteristics. This FGN model can efficiently predict the fragment mass, size, and velocity with a significantly reduced computational cost. Intensive predictions of fragments from different wall configurations and explosion intensities are carried out. The results are used to develop analytical formulae for predicting secondary fragments of RC walls subjected to close-in explosions.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420487","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}

引用次数: 0

On application of the relative entropy concept in reliability assessment of some engineering cable structures 论相对熵概念在某些工程电缆结构可靠性评估中的应用

IF 4.4 2区工程技术

Computers & Structures Pub Date : 2024-10-05 DOI: 10.1016/j.compstruc.2024.107560

{"title":"On application of the relative entropy concept in reliability assessment of some engineering cable structures","authors":"","doi":"10.1016/j.compstruc.2024.107560","DOIUrl":"10.1016/j.compstruc.2024.107560","url":null,"abstract":"<div><div>The main research problem studied in this work is an uncertain response and reliability assessment of the spatial cable structures due to the environmental stochasticity as well as material and geometrical imperfections. Some popular cable structures are analyzed for this purpose using the Stochastic Finite Element Method (SFEM) implemented with the use of three different techniques, namely the iterative generalized perturbation method, semi-analytical approach as well as the Monte-Carlo simulation. Uncertainty quantification delivered in this study is based on the series of FEM analyses of both static and dynamic structural problems. They enable the Least Squares Method determination of the structural polynomial responses linking extreme stresses and deformations with several uncorrelated uncertainty sources. Reliability assessment, fundamental in durability and Structural Health Monitoring, is completed using a comparison of the First Order Reliability Method (FORM) with probabilistic distance formulated by Bhattacharyya. Input uncertainties are assumed to be Gaussian according to the Maximum Entropy Principle. They have specific expected values following engineering design demands or the provisions of designing codes, whereas their standard deviations do not exceed the 10% level. The methods presented and the results obtained in this study may serve for further reliability analyses of large-scale civil engineering structures completed with both steel cables and also reinforced concrete plates like suspended bridges, for instance.</div></div>","PeriodicalId":50626,"journal":{"name":"Computers & Structures","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420486","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}

引用次数: 0