Journal of Engineering Mechanics-asce最新文献

A Mixed Variational Framework for Eigenstrain and Residual Stress Reconstruction 特征应变和残余应力重建的混合变分框架

Journal of Engineering Mechanics-asce Pub Date : 2023-11-01 DOI: 10.1061/jenmdt.emeng-7153

Sudipta Naskar, Biswanath Banerjee

引用次数: 0

Bayesian Nonlocal Operator Regression: A Data-Driven Learning Framework of Nonlocal Models with Uncertainty Quantification 贝叶斯非局部算子回归:具有不确定性量化的非局部模型的数据驱动学习框架

Journal of Engineering Mechanics-asce Pub Date : 2023-08-01 DOI: 10.1061/jenmdt.emeng-6994

Yiming Fan, Marta D’Elia, Yue Yu, Habib N. Najm, Stewart Silling

{"title":"Bayesian Nonlocal Operator Regression: A Data-Driven Learning Framework of Nonlocal Models with Uncertainty Quantification","authors":"Yiming Fan, Marta D’Elia, Yue Yu, Habib N. Najm, Stewart Silling","doi":"10.1061/jenmdt.emeng-6994","DOIUrl":"https://doi.org/10.1061/jenmdt.emeng-6994","url":null,"abstract":"We consider the problem of modeling heterogeneous materials where microscale dynamics and interactions affect global behavior. In the presence of heterogeneities in material microstructure it is often impractical, if not impossible, to provide quantitative characterization of material response. The goal of this work is to develop a Bayesian framework for uncertainty quantification (UQ) in material response prediction when using nonlocal models. Our approach combines the nonlocal operator regression (NOR) technique and Bayesian inference. Specifically, additive independent identically distributed Gaussian noise is employed to model the discrepancy between the nonlocal model and the data. Then, we use a Markov chain Monte Carlo (MCMC) method to sample the posterior probability distribution on parameters involved in the nonlocal constitutive law and associated modeling discrepancies relative to higher-fidelity computations. As an application, we consider the propagation of stress waves through a one-dimensional heterogeneous bar with randomly generated microstructure. Several numerical tests illustrate the construction, enabling UQ in nonlocal model predictions. Although nonlocal models have become popular means for homogenization, their statistical calibration with respect to high-fidelity models has not been presented before. This work is a first step in this direction, focused on Bayesian parameter calibration.","PeriodicalId":299892,"journal":{"name":"Journal of Engineering Mechanics-asce","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135618137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Closure to “Simultaneous Assessment of Damage and Unknown Input for Large Structural Systems by UKF-UI” “UKF-UI对大型结构系统的损伤和未知输入的同时评估”结语

Journal of Engineering Mechanics-asce Pub Date : 2023-07-01 DOI: 10.1061/jenmdt.emeng-6934

Ying Lei, Xingyu Li, Jinshan Huang, Lijun Liu

引用次数: 0

Postcritical Behavior of Nonlocal Strain Gradient Arches: Formulation and Differential Quadrature Solution 非局部应变梯度拱的后临界行为:公式和微分正交解

Journal of Engineering Mechanics-asce Pub Date : 2023-02-01 DOI: 10.1061/jenmdt.emeng-6727

Abhilash Dhanoriya, Manjur Alam, Sudib Kumar Mishra

{"title":"Postcritical Behavior of Nonlocal Strain Gradient Arches: Formulation and Differential Quadrature Solution","authors":"Abhilash Dhanoriya, Manjur Alam, Sudib Kumar Mishra","doi":"10.1061/jenmdt.emeng-6727","DOIUrl":"https://doi.org/10.1061/jenmdt.emeng-6727","url":null,"abstract":"Arches are important components in nanostructures and systems. Because of the remarkable strength of nanomaterials, nanoarches are slender, thus enhancing their vulnerability to geometric instability, such as buckling. Although molecular simulations are often employed to analyze nanostructures, their use in routine analysis/design is formidable due to prohibitively exhaustive computation. Equivalent continuum models were developed as alternatives. The buckling and postcritical phenomena of the classical arch also form an important benchmark problem in nonlinear mechanics. This study investigates the buckling and the postcritical behavior of nanoarch subjected to inward pressure using nonlocal (NL), strain gradient (SG) continuum theory. The governing equations are derived in the form of a sixth-order nonlinear integrodifferential equation, unlike the fourth-order for a classical arch. The equation is then solved numerically using a differential quadrature (DQ) with appropriate boundary conditions. An incremental-iterative arc-length continuation is employed for the solution of the resulting algebraic system of equations. The equilibrium paths are traced for the possible instability modes, such as symmetric/antisymmetric bifurcations, snap-through and limit point instability, ascertained with the internal-external force diagrams. A particular instability mode is triggered at a certain threshold/range of the slenderness ratio of the arch, which is significantly influenced by the NL and SG interactions. These interactions not only cause quantitative changes in the instability behavior but also lead to qualitative changes, such as cessation, shift, and conversion of modes, more prominently for SG arches. Similar to classical arches, the prebuckling nonlinearity is shown to be significant.","PeriodicalId":299892,"journal":{"name":"Journal of Engineering Mechanics-asce","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135859005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Expression of Concern for “Discrete Fresh Concrete Model for Simulation of Ordinary, Self-Consolidating, and Printable Concrete Flow” by Elham Ramyar and Gianluca Cusatis Elham Ramyar和Gianluca Cusatis对“用于模拟普通、自固结和可打印混凝土流动的离散新鲜混凝土模型”的关注表达

Journal of Engineering Mechanics-asce Pub Date : 2023-02-01 DOI: 10.1061/jenmdt.emeng-7024

引用次数: 0

Analytical Research on the Mitigation of Structure-Borne Vibrations from Subways Using Locally Resonant Periodic Foundations 局部共振周期基础对地铁结构振动抑制的分析研究

Journal of Engineering Mechanics-asce Pub Date : 2023-01-01 DOI: 10.1061/(asce)em.1943-7889.0002160

Xu, Yifei, Cao, Zhigang, Yuan, Zonghao, Cai, Yuanqiang, Costa, Pedro Alves

{"title":"Analytical Research on the Mitigation of Structure-Borne Vibrations from Subways Using Locally Resonant Periodic Foundations","authors":"Xu, Yifei, Cao, Zhigang, Yuan, Zonghao, Cai, Yuanqiang, Costa, Pedro Alves","doi":"10.1061/(asce)em.1943-7889.0002160","DOIUrl":"https://doi.org/10.1061/(asce)em.1943-7889.0002160","url":null,"abstract":"Filtering properties of locally resonant periodic foundations (LRPFs) have inspired an innovative direction towards the mitigation of structural vibrations. To mitigate the structure-borne vibrations from subways, this study proposes an LRPF equipped with a negative stiffness device connecting the resonator and primary structure. The proposed LRPF can exhibit a quasi-static band gap covering the ultra-low frequency range. These frequency components have the properties of strong diffraction and low attenuation and contribute the most to the incident wave fields impinging on nearby buildings. By formulating the interaction problem between the tunnel-ground and LRPF-superstructure systems, the mitigation performance of the proposed LRPF is evaluated considering the effects of soil compliance and superstructure. The performance depends on the dynamic properties of the ground, foundation, and superstructure as well as their coupling. Transmission analyses indicate that the superstructure responses can be effectively attenuated in the quasi-static band gap by adjusting the negative stiffness. Considering the coupling of the flexible ground, the peak responses of the LRPF-superstructure system occur not only at its eigenfrequencies but also at coupled resonance frequencies due to the contribution of the soil compliance. This study provides an analytical tool for mitigating the structure-borne vibrations from subways with the LRPF.","PeriodicalId":299892,"journal":{"name":"Journal of Engineering Mechanics-asce","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136367729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Particle and Continuum Rotations of Granular Materials: Discrete-Element Method Simulations and Experiment 颗粒材料的颗粒和连续体旋转:离散元方法模拟和实验

Journal of Engineering Mechanics-asce Pub Date : 2021-11-01 DOI: 10.1061/(ASCE)EM.1943-7889.0001997

Chaofa Zhao, N. Kruyt

引用次数: 1

Experimental Characterization of Frictional Line Contact by Digital Image Correlation and Inverse Method 摩擦线接触的数字图像相关与反演实验表征

Journal of Engineering Mechanics-asce Pub Date : 2021-11-01 DOI: 10.1061/(ASCE)EM.1943-7889.0002007

Q. Lin, Chen-Yun Sun, J. Chen

引用次数: 0

Fundamental Mode Shape–Based Structural Damage Quantification Using Spectral Element Method 基于基模态振型的结构损伤谱元量化

Journal of Engineering Mechanics-asce Pub Date : 2021-11-01 DOI: 10.1061/(ASCE)EM.1943-7889.0001970

Purushottam Kumar Chaudhary, Kumar Anjneya, K. Roy

引用次数: 3

Advanced Modeling of a Historical Masonry Umbrella Vault: Settlement Analysis and Crack Tracking via Adaptive NURBS Kinematic Analysis 历史砌体伞形拱顶的高级建模:基于自适应NURBS运动学分析的沉降分析和裂缝跟踪

Journal of Engineering Mechanics-asce Pub Date : 2021-11-01 DOI: 10.1061/(ASCE)EM.1943-7889.0001987

N. Grillanda, L. Cantini, L. Barazzetti, G. Milani, S. D. Torre

引用次数: 2