Computers & Structures最新文献_第7页

An experimental assessment of ground-borne vibration impact of tramcars 有轨电车地面振动冲击试验研究

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-12 DOI: 10.1016/j.compstruc.2025.108069

L. Faccini, F. Castellini, E. Di Gialleonardo, S. Alfi, S. Bionda, R. Corradi

Ground-borne vibrations from rail transit systems present challenges in urban areas due to their effects on structures and human comfort. This study introduces a falling mass impact setup to estimate the transmissibility between the track and a receiver in the surrounding area. This enables the calculation of the Line Source Transfer Mobility (LSTM), required by the U.S. Federal Transit Administration (FTA) to assess ground-borne vibrations from rail vehicles. The falling mass method offers higher energy input and better repeatability than traditional impact hammers, making it suitable for evaluating soil and building transmissibility even at long distances. Transfer mobilities obtained with this method are validated against hammer-based measurements. Vibration levels produced by a modern tramcar running at 10, 30, and 50 km/h are measured at various distances and normalised using the corresponding LSTM, in line with the FTA Detailed Assessment Method. Force Density Levels (FDLs) are calculated for each speed, with the highest values at 50 km/h. A strong consistency of FDLs across distances confirms the method’s robustness. This integrated experimental approach offers a reliable framework for characterising vibration sources and supports the assessment of vehicles and infrastructure planning in areas sensitive to vibration.

轨道交通系统的地面振动对城市结构和人体舒适度的影响给城市带来了挑战。本研究引入了一个落体碰撞装置来估计轨道与周围区域接收器之间的传递率。这使得计算线源转移移动性（LSTM）成为可能，这是美国联邦运输管理局（FTA）评估轨道车辆地面振动的要求。与传统的冲击锤相比，下落质量法提供了更高的能量输入和更好的重复性，使其适用于评估土壤和建筑的长距离传递性。用该方法获得的传递迁移率与基于锤的测量结果进行了验证。以每小时10公里、30公里和50公里的速度行驶的现代有轨电车所产生的振动水平，在不同的距离上进行测量，并根据自由贸易协定详细评估方法，使用相应的LSTM进行归一化。力密度水平（fdl）计算为每一个速度，最高的值在50公里/小时。fdl跨距离的强一致性证实了该方法的鲁棒性。这种综合实验方法为表征振动源提供了可靠的框架，并支持对振动敏感地区的车辆和基础设施规划进行评估。

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引用次数: 0

High-order time-spectral BEM for efficient elastodynamic analysis 高效弹性动力学分析的高阶时谱边界元

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-11 DOI: 10.1016/j.compstruc.2025.108076

Yan Gu , Wenzhen Qu , Chuanzeng Zhang , Vladimir Babeshko , Yuri V. Petrov

This study presents a novel boundary element method (BEM) framework for the accurate and efficient numerical solution of elastodynamic problems. By reformulating the time-derivative terms as equivalent body forces, the method enables the use of static fundamental solutions for dynamic analysis, thereby eliminating the need for frequency-domain transformations or the construction of complex time-dependent Green’s functions. In the temporal domain, instead of directly approximating the time-differentiation operators, a more stable time-spectral integration technique based on orthogonal polynomial expansions is introduced. This scheme can, in principle, achieve arbitrary-order of accuracy in the temporal space and eliminate the strict time-step limitations inherent in conventional finite-difference-based schemes. Moreover, the resulting coefficient matrix is time-independent and therefore needs to be computed only once for the entire time-marching process. To evaluate domain integrals, discontinuous triangular elements are employed for spatial discretization, and a scaled coordinate transformation (SCT) technique is employed to address singularities arising from source-field point coincidences. Preliminary numerical experiments in elastodynamic analysis demonstrate that the proposed framework is robust and flexible for long-time dynamic simulations, particularly in problems involving rapid transients or complex geometries.

本文提出了一种新的边界元法框架，用于精确、高效地求解弹性动力学问题。通过将时间导数项重新表述为等效体力，该方法可以使用静态基本解进行动态分析，从而消除了频域变换或构建复杂的时间相关格林函数的需要。在时域中，引入了一种基于正交多项式展开的更稳定的时谱积分技术，而不是直接逼近微分算子。该方案原则上可以在时间空间上实现任意阶的精度，消除了传统有限差分方案固有的严格的时间步长限制。此外，得到的系数矩阵是时间无关的，因此在整个时间推进过程中只需要计算一次。在计算域积分时，采用不连续三角形单元进行空间离散，并采用缩放坐标变换（SCT）技术处理源场点重合引起的奇异点。弹性动力学分析的初步数值实验表明，所提出的框架对于长时间的动态模拟具有鲁棒性和灵活性，特别是在涉及快速瞬态或复杂几何形状的问题中。

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引用次数: 0

First-order equivalent static loads for dynamic response structural optimization 一阶等效静荷载的动力响应结构优化

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-11 DOI: 10.1016/j.compstruc.2025.108071

Mordechay Buzaglo , Nicolò Pollini

A novel first-order equivalent static loads approach for optimization of structural dynamic response, F-ESL, is presented and compared with the basic equivalent static load formulation, ESL. F-ESL simplifies dynamic optimization problems by converting them into a series of static optimization sub-problems. The ESL algorithm in its original formulation does not have a guaranteed capability of reaching, or recognizing, final designs that satisfy the necessary first-order optimality conditions. F-ESL addresses this limitation by including first-order terms directly into the equivalent static load definition. This new mathematical information guides the optimization algorithm more effectively toward solutions that satisfy both feasibility and optimality conditions. Using reproducible numerical examples, we show that F-ESL overcomes the known limitations of the original ESL, often with a few outer function evaluations and fast convergence. At the same time, F-ESL maintains ESL simplicity, robustness, and ease of implementation, providing practitioners with an effective tool for structural dynamic optimization problems.

提出了一种新的一阶等效静荷载优化方法F-ESL，并与基本等效静荷载公式ESL进行了比较。F-ESL将动态优化问题简化为一系列静态优化子问题。原始形式的ESL算法不能保证达到或识别满足必要的一阶最优性条件的最终设计。F-ESL通过将一阶项直接纳入等效静态载荷定义来解决这一限制。这种新的数学信息引导优化算法更有效地求解同时满足可行性和最优性条件的解。通过可重复的数值例子，我们证明了F-ESL克服了原始ESL的已知局限性，通常只需要少量的外部函数计算和快速收敛。同时，F-ESL保持了ESL的简单性、鲁棒性和易于实现性，为从业者提供了解决结构动态优化问题的有效工具。

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引用次数: 0

Predicting probabilistic flexural strength of corroded reinforced concrete columns based on physics-informed GPR model 基于物理信息GPR模型的锈蚀钢筋混凝土柱概率抗弯强度预测

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-08 DOI: 10.1016/j.compstruc.2025.108074

Pengfei Zhang , Qiang Zhang , Weiwei Xie , Bo Yu

A physics-informed Gaussian process regression (PI-GPR) model for predicting the probabilistic flexural strength of corroded reinforced concrete (RC) columns was developed based on the multi-level embedding strategy. According to the moment equilibrium conditions, a physical model representing the flexural mechanism of corroded RC columns was established first. Subsequently, the multi-level embedding strategy was adopted to develop the PI-GPR model by constraining the mean, kernel, and loss functions hierarchically. Meanwhile, an adaptive trade-off between physical priors and data features was achieved by adding the dynamic coefficients that are continuously updated as training data changes. Then the PI-GPR model was applied to predict the probabilistic flexural strength of corroded RC columns. Finally, the effectiveness of the PI-GPR model was validated by comparing it with traditional prediction methods. Analysis results show that the PI-GPR model, which integrates the physical constraints with data-driven learning, demonstrates excellent performance and robust uncertainty quantification. Compared with traditional GPR, the PI-GPR ensures high physical consistency of predictions, which not only achieves an average improvement of 20% in confidence interval coverage when the training set proportion was only 30%, but also reduces the mean absolute error and root mean square error for edge samples by 23% and 21%, respectively.

基于多层嵌入策略，建立了一种基于物理信息的高斯过程回归（PI-GPR）模型，用于腐蚀钢筋混凝土柱的概率抗弯强度预测。根据弯矩平衡条件，首先建立了腐蚀钢筋混凝土柱受弯机理的物理模型。随后，采用多层嵌入策略，对均值、核函数和损失函数进行分层约束，建立PI-GPR模型。同时，通过添加随训练数据变化而不断更新的动态系数，实现了物理先验和数据特征之间的自适应权衡。然后应用PI-GPR模型对锈蚀钢筋混凝土柱的概率抗弯强度进行预测。最后，通过与传统预测方法的比较，验证了PI-GPR模型的有效性。分析结果表明，PI-GPR模型将物理约束与数据驱动学习相结合，具有良好的性能和鲁棒性。与传统GPR相比，PI-GPR保证了预测的高物理一致性，在训练集比例仅为30%的情况下，置信区间覆盖率平均提高20%，边缘样本的平均绝对误差和均方根误差分别降低23%和21%。

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引用次数: 0

Scale-invariant Monte Carlo and multilevel Monte Carlo estimation of mean and variance: An application to simulation of linear elastic bone tissue 尺度不变蒙特卡罗和多水平蒙特卡罗均值和方差估计：在线性弹性骨组织模拟中的应用

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-06 DOI: 10.1016/j.compstruc.2025.108054

Sharana Kumar Shivanand , Bojana Rosić

We propose novel scale-invariant error estimators for the Monte Carlo and multilevel Monte Carlo estimation of mean and variance. For any linear transformation of the distribution of the quantity of interest, the computation cost across fidelity levels is optimized using a normalized error estimate, which is not only fully dimensionless but also remains robust to variations in the characteristics of the distribution. We demonstrate the effectiveness of the algorithms through application to a mechanical simulation of linear elastic bone tissue, where material uncertainty incorporating both heterogeneity and random anisotropy is considered in the constitutive law.

我们提出了新的尺度不变误差估计的蒙特卡罗和多电平蒙特卡罗估计的均值和方差。对于兴趣量分布的任何线性变换，使用归一化误差估计来优化跨保真度水平的计算成本，该估计不仅是完全无因次的，而且对分布特征的变化保持鲁棒性。我们通过应用于线弹性骨组织的力学模拟来证明算法的有效性，其中在本构律中考虑了包含非均质性和随机各向异性的材料不确定性。

引用次数: 0

Automated design optimization of bowstring tied-arch concrete bridges 弓弦系拱混凝土桥梁自动化设计优化

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-05 DOI: 10.1016/j.compstruc.2025.108068

Alberto M.B. Martins , Luís M.C. Simões , João H.J.O. Negrão

This article presents an optimization-based approach to assist in the design of bowstring tied-arch concrete bridges. This approach comprises an automated procedure to define initial designs and a gradient-based algorithm, from which local optimum solutions are obtained, and the least-cost solution is selected as the optimum design. The finite element method is used for the three-dimensional analysis considering several load cases, geometrical nonlinearities and time-dependent effects. The design is posed as a cost minimization subject to constraints on the displacements and stresses defined according to the Eurocodes provisions. A constraint aggregation approach is adopted to solve the problem by minimizing a convex scalar function. The discrete direct method for sensitivity analysis provides the algorithm with the structural response to changes in the design variables. The design variables are the arch and deck cross-sectional sizes, the hangers and tendons cross-sectional areas and prestressing forces, the geometry of the arch, the hangers’ layout and the number of hangers’ anchoring points in the deck. The optimization of a 120 m single-span bridge illustrates the features and applicability of the proposed approach. Optimum solution with Nielsen layout, deck slenderness of 1/150 and arch rise-to-span ratio of 1/5.

本文提出了一种基于优化的方法来辅助弓弦系拱桥的设计。该方法包括一个自动定义初始设计的过程和一个基于梯度的算法，从中获得局部最优解，并选择代价最小的解作为最优设计。考虑多种载荷情况、几何非线性和时变效应，采用有限元法进行三维分析。根据欧洲规范的规定，在位移和应力的限制下，设计提出了成本最小化的要求。采用约束聚合的方法，通过最小化凸标量函数来求解该问题。灵敏度分析的离散直接法为算法提供了结构对设计变量变化的响应。设计变量为拱和甲板的截面尺寸、吊杆和筋的截面面积和预应力、拱的几何形状、吊杆的布置以及吊杆在甲板上锚固点的数量。以一座120m单跨桥梁为例，说明了该方法的特点和适用性。最优方案为尼尔森布局，甲板长细为1/150，拱高跨比为1/5。

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引用次数: 0

A new variational approach for coupling of non-conforming patches in Isogeometric Analysis 等几何分析中非协调块耦合的一种新变分方法

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-04 DOI: 10.1016/j.compstruc.2025.108067

Saeed Saeedmonir , Alireza Sadeghirad

Isogeometric Analysis is known to be a powerful numerical method in bridging between Computer-Aided Design and Computational Mechanics by utilizing special spline basis functions for both geometric and field discretization, resulting in reduction of errors corresponding to geometric approximations in traditional Finite Elements Method. Moreover, it can satisfy higher-order continuity to ensure stability and accuracy. However, there are several challenges in dealing with multi-patch domains, especially in the case of non-conforming patches in establishing continuity across the patch interfaces. Existing methods such as the penalty method, Lagrange multipliers and Nitsche’s method often encounter several numerical issues such as ill-conditioned systems, saddle point problem and computational overhead. This study presents a novel variational formulation for coupling of non-conforming patches while preserving higher-order continuity without introducing new degrees of freedom. In addition, the proposed method ensures a symmetric system, guaranteeing stable and efficient implementation. The constraints are applied through the variational formulation and therefore, no other approach is utilized within the procedure. Some benchmark numerical examples are provided to demonstrate the performance, accuracy and effectiveness of the proposed method.

等几何分析是连接计算机辅助设计和计算力学的一种强大的数值方法，它利用特殊的样条基函数进行几何离散和场离散，从而减少了传统有限元方法中几何近似的误差。同时满足高阶连续性，保证了系统的稳定性和精度。然而，在处理多补丁域时存在一些挑战，特别是在不符合补丁的情况下，在补丁接口之间建立连续性。现有的方法如惩罚法、拉格朗日乘子法和Nitsche的方法经常遇到一些数值问题，如病态系统、鞍点问题和计算开销。本研究提出了一种新的变分公式，在不引入新的自由度的情况下，在保持高阶连续性的情况下，对不一致的贴片进行耦合。此外，该方法保证了系统的对称性，保证了实现的稳定性和效率。约束是通过变分公式应用的，因此，在程序中没有使用其他方法。给出了一些基准数值算例，验证了该方法的性能、准确性和有效性。

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引用次数: 0

Designer preference-driven topology optimization using a human-in-the-loop neural network 设计者偏好驱动的拓扑优化使用人在环神经网络

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-04 DOI: 10.1016/j.compstruc.2025.108070

Boxu Tian , Wenliang Qian , Yefei Yang

Topology optimization is a powerful computational methodology for generating high-performance structures. However, ignoring aesthetics limits the practical application. User interaction helps address this limitation, but current methods lack generality, needing separate design and sensitivity analyses for each interaction form. To overcome this challenge, we propose a Designer Preference-Driven Neural Topology Optimization (DPDNTO) method, which utilizes a unified interaction parameter to formulate a unified, mask-based loss function to control geometric features and material distribution. In addition, feature sizes are flexibly controlled by adjusting the number of neurons in the DPDNTO method. By utilizing the backpropagation mechanism of neural networks, the proposed method efficiently updates design variables and automatically balances these multi-objective tasks through a dynamic parameter strategy. To provide further intuitive visual feedback, a multimodal large model is employed to render optimized structures into conceptual visualization images. Numerical experiments demonstrate that the proposed method not only enhances the aesthetic quality of the final designs but also improves structural stress performance and linear buckling resistance. These findings establish DPDNTO as a versatile and computationally efficient paradigm, bridging the critical gap between algorithmic optimization and preference-driven aesthetics and paving the way for advancements in fields such as architecture, industrial design, and advanced manufacturing.

拓扑优化是生成高性能结构的一种强大的计算方法。然而，忽视美学限制了实际应用。用户交互有助于解决这一限制，但目前的方法缺乏通用性，需要对每个交互形式进行单独的设计和敏感性分析。为了克服这一挑战，我们提出了一种设计师偏好驱动的神经拓扑优化（DPDNTO）方法，该方法利用统一的交互参数来制定统一的、基于掩模的损失函数来控制几何特征和材料分布。此外，DPDNTO方法通过调整神经元数量灵活地控制特征大小。该方法利用神经网络的反向传播机制，通过动态参数策略，有效地更新设计变量，实现多目标任务的自动平衡。为了进一步提供直观的视觉反馈，采用多模态大模型将优化后的结构渲染成概念可视化图像。数值实验表明，该方法不仅提高了最终设计的美观性，而且改善了结构的应力性能和抗线性屈曲性能。这些发现确立了DPDNTO作为一种通用且计算效率高的范式，弥合了算法优化和偏好驱动美学之间的关键差距，并为建筑、工业设计和先进制造等领域的进步铺平了道路。

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引用次数: 0

A micromechanics-based computational framework for predicting the elastic modulus and compressive strength of normal and high-performance concrete 一个基于微力学的计算框架，用于预测普通和高性能混凝土的弹性模量和抗压强度

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-03 DOI: 10.1016/j.compstruc.2025.108055

Hoang-Quan Nguyen , Gia-Khuyen Le , Tinh Quoc Bui , Thi-Loan Bui , Bao-Viet Tran

This study presents a computational framework that integrates micromechanics, a phase-field damage model, and genetic programming-based symbolic regression to predict the elastic modulus and compressive strength of both normal and high-strength concrete. The micromechanical formulations are developed using an extended generalized self-consistent scheme, incorporating a quasi-elasto-plastic brittle behavior governed by a von Mises yield criterion. A simplified phase-field damage model is proposed, introducing a compressive phase-field variable along with an analytical approximation that links fracture energy to the macroscopic behavior of concrete. The proposed framework is validated through strong agreement among numerical simulations, experimental observations, and theoretical predictions, supporting the development of a robust theoretical database for elastic modulus, compressive strength, and associated material properties. Based on this dataset, an efficient computational strategy is developed and examined to generate simple and practical symbolic regression expressions within the Genetic Programming-based framework to derive predictive equations for elastic modulus as a function of compressive strength and aggregate characteristics. These equations are validated against established standards and experimental data, confirming their accuracy and practical relevance for structural design applications.

本研究提出了一个计算框架，集成了微观力学、相场损伤模型和基于遗传规划的符号回归，以预测普通和高强混凝土的弹性模量和抗压强度。微力学公式是使用扩展的广义自洽方案开发的，结合了由von Mises屈服准则控制的准弹塑性脆性行为。提出了一种简化的相场损伤模型，引入了压缩相场变量以及将断裂能与混凝土宏观行为联系起来的解析近似。通过数值模拟、实验观察和理论预测之间的强烈一致性，验证了所提出的框架，支持弹性模量、抗压强度和相关材料特性的强大理论数据库的发展。基于此数据集，开发并检查了一种有效的计算策略，以在基于遗传规划的框架内生成简单实用的符号回归表达式，以导出弹性模量作为抗压强度和聚合特性的函数的预测方程。这些方程是根据既定的标准和实验数据进行验证的，证实了它们的准确性和结构设计应用的实际相关性。

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引用次数: 0

An extended Generalized beam theory formulation for large deformation analyses of perforated Thin-Walled members 多孔薄壁构件大变形分析的广义梁理论扩展公式

IF 4.8 2区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers & Structures

Pub Date : 2025-12-02 DOI: 10.1016/j.compstruc.2025.108052

Liping Duan , Ji Miao , Jincheng Zhao

This paper presents a geometrically exact beam finite element based on the classic Generalized Beam Theory (GBT) for large-deformation analyses of perforated thin-walled sections. The proposed formulation enables the beam to undergo arbitrary cross-sectional deformations, such as in-plane distortion, out-of-plane warping, transverse bending, and extension of the cross-sectional walls. The key novelty of the proposed approach lies in the extension/improvement of a previous GBT formulation for handling linear buckling analyses of perforated thin-section beams, proposed by the authors Duan et al. (2022), to the realm of large-deformation analysis. The geometrically exact kinematic description is built by enriching the cross-section kinematics of a spatially rotated Euler-Bernoulli/Vlasov thin-section beam with some hierarchic deformation modes and using the enrichment functions constructed in terms of signed distance functions to approximate cross-section discontinuities caused by holes. The Neo-Hookean hyperelastic material model is imposed on the proposed beam FE formulation, where an iterative procedure is performed to ensure the plane stress assumption for the stress fields in cross-section walls. The discrete equations are obtained by using the displacement Galerkin method. Some illustrative examples are presented to demonstrate the potential of the proposed beam FE, and the results demonstrate its capability to perform the GBT modal decomposition of buckled configurations of perforated thin-section members.

本文基于经典的广义梁理论（GBT），提出了一种用于多孔薄壁截面大变形分析的几何精确梁有限元。所提出的公式使梁能够经受任意截面变形，如面内变形、面外翘曲、横向弯曲和截面壁的延伸。所提出方法的关键新颖之处在于，将Duan等人（2022）提出的用于处理穿孔薄截面梁线性屈曲分析的先前GBT公式扩展/改进到大变形分析领域。将空间旋转的Euler-Bernoulli/Vlasov薄截面梁的截面运动学丰富为若干层次变形模式，并利用符号距离函数构造的丰富函数近似孔洞引起的截面不连续，从而建立几何精确的运动学描述。将Neo-Hookean超弹性材料模型应用于所提出的梁有限元公式中，并进行迭代过程以确保截面壁面应力场的平面应力假设。采用位移伽辽金法得到离散方程。本文给出了一些实例来证明所提出的梁有限元分析的潜力，结果表明它能够执行带孔薄壁构件屈曲结构的GBT模态分解。

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引用次数: 0