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Dynamical analysis of sliding connections with mesh independent roughness by a total Lagrangian FEM 基于全拉格朗日有限元法的网格无关粗糙度滑动连接动力学分析
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2022-01-01 DOI: 10.1590/1679-78257295
Tiago Morkis Siqueira, Edwin Alexander Morantes Rodríguez, H. B. Coda
Sliding connections are present in several applications on the mechanics, civil and aerospace industries. A framework consisting on an accurate and stable formulation to describe the dynamics of flexible systems with sliding connections is developed. The total Lagrangian positional approach of the Finite Element Method is employed using 2D solid and frame elements to discretize bodies and connections. This allows a wide range of applications, particularly the local modelling of joints. The proposed formulation includes roughness along sliding paths independent from the finite element geometry discretization. Following variational principles, Lagrange multipliers are used to impose sliding constraints on the equations of motion. A direct time integration is performed by the generalized-α method and its stability in the present finite deformation context is evaluated. The resulting nonlinear equations are solved by the Newton-Raphson method. Examples are presented where the proposed framework is evaluated regarding its dynamical behavior and to solve practical scenarios for which sliding modelling is a necessity.
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引用次数: 0
Experimental Study and In-depth Tensile Mechanism Analysis of Grouted Sleeve Lapping Conectors 灌浆套筒搭接接头拉伸机理试验研究及深入分析
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2022-01-01 DOI: 10.1590/1679-78256935
Qiong Yu, Liang Zhang, Peiyan Tang, Ling-zhi Li, Xingkui Zhang, Baoxiu Fan, Zhi Zhang, Zhenhai Chen
To study the failure modes, bearing capacity, ductility, and sleeve strain of grouted sleeve lapping connectors, 36 specimens were tested under uniaxial tensile load. The test results show that the sleeves are under longitudinal tension at the beginning, which changes to longitudinal compression in the late stage of loading, and the changing load increases gradually with the lap length. The force transmission path and mechanical mechanism of the connectors are analyzed. The distribution and development process of longitudinal sleeve stress is analyzed based on the constitutive model stress, and it is found that the sleeve changes from longitudinal tension to longitudinal compression at the late loading stage, which is consistent with the test results. Based on the test, the calculation formulas of the ultimate bond strength and critical lap length of the grouted sleeve lapping connector are proposed. The research results lay a theoretical foundation for the application of grouted sleeve lapping connectors.
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引用次数: 3
Numerical investigation into the effectiveness of steel i-beam strengthening techniques in steel-framed buildings 钢结构建筑工字钢加固技术有效性的数值研究
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2021-10-22 DOI: 10.1590/1679-78256696
S. Alhammadi
Abstract While structural strengthening is not the consequence of a structure's condition of failure, it does take place as a result of a need to increase the structural stiffness and load capacity when a change in the structure's usage occurs. As a result, various techniques must be presented to enhance the structural elements by considering economic and time requirement factors and load-bearing capacity. In this study, the issue is demonstrated using a steel I-beam that was strengthened using six different techniques to postpone the beam's lateral torsional buckling to achieve its full plastic flexural capacity. Finite element (FE) analyses were carried out with the use of Abaqus software to predict the response of both unstrengthened and strengthened steel I-beams in a four-point bending test for a total of 56 specimens with different parameters studied. In order to understand which strengthening techniques are most appropriate for a new or existing steel building, an analysis of the costs was conducted for each strengthening technique to reach a conclusion regarding which strengthening techniques would be ideal for use.
摘要虽然结构加固不是结构失效条件的结果,但当结构用途发生变化时,它确实是由于需要增加结构刚度和承载能力而发生的。因此,必须考虑经济和时间要求因素以及承载能力,提出各种技术来增强结构元件。在本研究中,使用一根工字钢梁来证明这一问题,该工字钢采用六种不同的技术进行加固,以推迟梁的侧向扭转屈曲,从而实现其全塑性弯曲承载力。使用Abaqus软件对56个不同参数的试件进行了有限元分析,以预测未加固和加固工字钢在四点弯曲试验中的响应。为了了解哪些加固技术最适合新的或现有的钢结构建筑,对每种加固技术的成本进行了分析,以得出哪些加固技术更适合使用的结论。
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引用次数: 2
Reliability analysis of very slender columns subjected to creep 细长柱在蠕变作用下的可靠性分析
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2021-10-22 DOI: 10.1590/1679-78256569
Kleyser Ribeiro, D. D. Loriggio, M. V. Real
Abstract A mechanical model was developed to evaluate the reliability of very slender columns subject to creep, employing the nonlinear moment-curvature relationship. Second-order effects were considered by the finite difference method. Numerical tests were carried out on 432 columns with a slenderness index between 100 and 200. The general nonlinear method was adopted to determine the design load, applying the displacement of the stress-strain diagram for consideration of creep. The reliability index was calculated using the Monte Carlo method and the First Order Reliability Method. Among the results obtained, it was observed that it is important to review the safety criterion of the Brazilian Standard NBR 6118 about the very slender columns (90 < λ ≤ 200) by performing the calibration of the additional coefficient γn1. In addition, it was observed that an increase in the reinforcement ratio commonly produces a reduction in the reliability index; an increase in the first-order relative eccentricity promotes a decrease in reliability, among other evaluated factors.
摘要利用非线性弯矩-曲率关系,建立了一个评估细长柱蠕变可靠性的力学模型。采用有限差分法考虑了二阶效应。对432根长细比指数在100-200之间的柱进行了数值试验。采用一般的非线性方法确定设计荷载,应用应力-应变图的位移考虑蠕变。可靠性指标采用蒙特卡罗方法和一阶可靠性方法计算。在获得的结果中,可以观察到,通过对附加系数γn1进行校准,审查巴西标准NBR 6118中关于细长柱(90<λ≤200)的安全标准非常重要。此外,观察到,加强比的增加通常会导致可靠性指数的降低;一阶相对偏心率的增加促进了可靠性的降低。
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引用次数: 1
Postbuckling analysis of nonlocal functionally graded beams 非局部功能梯度梁的后屈曲分析
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2021-10-22 DOI: 10.1590/1679-78256699
K. Soncco, K. N. Betancourt, R. Arciniega, J. Reddy
Abstract The main goal of this research is to study the postbuckling behavior of nonlocal functionally graded beams. Eringen’s nonlocal differential model is used to evaluate the influence of the material length scale in the bending response. An improved shear deformation beam theory with five independent parameters is utilized, which is suitable for the use of 3D constitutive equations. A finite element model is derived with spectral high-order interpolation functions to avoid shear locking. The formulation is verified by comparing the present results with the ones found in the literature. Functionally graded beams with different boundary conditions, nonlocal parameters, and power law indices are analyzed. It is shown that the present model can accurately predict the behavior of nonlocal beams due to the use of high-order terms in the displacement field in comparison with classical beam formulations. Finally, new benchmark problems are analyzed to show the capabilities of the present model to evaluate the effect of the nonlocal parameter and the power law index on postbuckling beam behavior.
摘要本研究的主要目的是研究非局部功能梯度梁的后屈曲行为。Eringen的非局部微分模型用于评估材料长度尺度对弯曲响应的影响。采用了一种改进的具有五个独立参数的剪切变形梁理论,该理论适用于三维本构方程。为了避免剪切锁定,利用谱高阶插值函数建立了有限元模型。通过将目前的结果与文献中发现的结果进行比较来验证该配方。分析了具有不同边界条件、非局部参数和幂律指标的功能梯度梁。结果表明,与经典梁公式相比,由于在位移场中使用了高阶项,本模型可以准确地预测非局部梁的行为。最后,分析了新的基准问题,以表明该模型能够评估非局部参数和幂律指标对后屈曲梁性能的影响。
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引用次数: 4
Vibration Analysis of Axially Functionally Graded Timoshenko Beams with Non-uniform Cross-section 非均匀截面轴功能梯度Timoshenko梁的振动分析
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2021-10-22 DOI: 10.1590/1679-78256434
Wei-Ren Chen
Abstract The present paper investigates the transverse vibration of a non-uniform axially functionally graded Timoshenko beam with cross-sectional and material properties varying in the beam length direction. The Chebyshev collocation method is used to spatially discretize the governing partial differential equations of motion of the beam into time-dependent ordinary differential equations in terms of Chebyshev differentiation matrices. An algebraic eigenvalue equation in matrix form is then formed to study the free vibration behavior of non-uniform axially functionally graded Timoshenko beams. Several results of natural frequencies of the beams are evaluated and compared with those in the published literature to assure the accuracy of the proposed model. The effects of taper ratio, material graded index, slenderness ratio, material compositions and restraint types on the natural frequencies of tapered axially functionally graded Timoshenko beams are examined.
摘要本文研究了截面和材料性质沿梁长方向变化的非均匀轴向功能梯度Timoshenko梁的横向振动。采用切比雪夫配置法将梁运动的控制偏微分方程空间离散为基于切比雪夫微分矩阵的含时常微分方程。建立了矩阵形式的代数特征值方程,研究了非均匀轴向功能梯度Timoshenko梁的自由振动行为。对梁的几个固有频率结果进行了评估,并与已发表的文献中的结果进行了比较,以确保所提出的模型的准确性。研究了锥度比、材料级配指数、长细比、材料成分和约束类型对锥形轴向功能梯度Timoshenko梁固有频率的影响。
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引用次数: 3
Elastoplastic Analysis of Perforated Metal Sheets using Transformation Field Analysis and Finite Element Method 基于转换场分析和有限元法的多孔金属板弹塑性分析
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2021-09-03 DOI: 10.1590/1679-78256650
C. A. V. Várady Filho, M. Cavalcante
Abstract This investigation analyzes the cost-benefit ratio of the Transformation Field Analysis to compute the elastoplastic behavior of periodically perforated metal sheets. Evaluation of accuracy and computational cost are analyzed by implementing a finite element approach coupled with the Transformation Field Analysis technique for different meshes and finite element orders. Numerical studies are employed to compare Transformation Field Analysis accuracy with standard Finite Element Analysis for elastoplastic analysis of periodically perforated metal sheets. Additionally, experimental data is employed to validate the Transformation Field Analysis results. The Transformation Field Analysis requires calculating the strain concentration and influencing tensors employing the finite element method. The numerical results show the technique's capabilities and favorable scenarios, besides the influence of domain discretization and finite element order.
摘要本研究分析了转换场分析的成本效益比,以计算周期穿孔金属板的弹塑性行为。对于不同的网格和有限元阶数,通过实现有限元方法与变换场分析技术相结合来分析精度和计算成本的评估。采用数值研究方法比较了周期穿孔金属板弹塑性分析中变换场分析和标准有限元分析的精度。此外,还利用实验数据对变换场分析结果进行了验证。变换场分析需要采用有限元方法计算应变集中和影响张量。数值结果表明,除了域离散化和有限元阶数的影响外,该技术的性能和良好的场景。
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引用次数: 3
Experimental research on tungsten alloy spherical fragments penetrating into carbon fiber target plate 钨合金球形破片穿透碳纤维靶板的实验研究
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2021-07-26 DOI: 10.1590/1679-78256510
Dou Hong, Wen-bin Li, Yu Zheng, Ning Jiang
Abstract A ballistic projectile launching device was used to study the penetration behaviors of tungsten alloy spherical fragments of various diameters into carbon fiber composite target plates of different thicknesses. Based on the ballistic test results, we obtained the relationship between ultimate penetration velocity, target plate thickness, and fragment diameter as well as the relationship between the fragment penetration energy and fragment incident velocity. Using dimensional analysis, we obtained a formula relating the incident fragment velocity and the fragment penetration energy, which showed good agreement with the experimental values. We also analyzed the main fracture mode and the energy absorption mechanism of the carbon composite target plate under high-velocity impacts of tungsten alloy spheres and investigated the experimental damage modes of the target plate at different fragment velocities during the ballistic impact.
摘要利用弹道弹丸发射装置,研究了不同直径的钨合金球形破片对不同厚度碳纤维复合材料靶板的侵彻行为。根据弹道试验结果,得到了最终侵彻速度与靶板厚度、破片直径之间的关系以及破片侵彻能量与破片入射速度之间的关系。通过量纲分析,得到了入射破片速度与破片穿透能的关系式,与实验值吻合较好。分析了钨合金球高速冲击下碳复合靶板的主要断裂模式和吸能机理,研究了不同破片速度下靶板在弹道冲击下的实验损伤模式。
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引用次数: 1
Bilateral Interference of Wind Loads Induced on Duplicate Building Models of Various Shapes 不同形状重复建筑模型上风荷载的双向干扰
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2021-07-26 DOI: 10.1590/1679-78256595
Supriya Pal, R. Raj, S. Anbukumar
Abstract The current investigation focuses on the results of an experimental investigation of Square-plan-shape and Remodel-triangle-shape building model’s varied interference conditions between duplicate building models of 1:300 scale (at 100% blockage) on wind-induced pressure and base moments at fixed 10% of the height of the instrumented model. Under current working conditions, the study concludes that -1 > Interference Factor > 1 as experienced by the Remodel-triangle-shape model results in reduced performance of the instrumented model as opposed to the Square-plan-shape model. Front-to-Front interference condition of Remodel-triangle-shape model has the best overall performance in along-wind and crosswind directions, whereas Front-to-Back interference condition of Remodel-triangle-shape model has the best torsional performance. Back-to-Back interference of a Remodel-triangle-shape model should be avoided because the orientation of duplicate models attracts the most overturning moments in both the along-wind and crosswind directions of all interference conditions investigated in this study.
摘要当前的研究重点是对正方形平面形状和重塑三角形建筑模型的实验研究结果,该模型在1:300比例的重复建筑模型之间(在100%堵塞的情况下)对仪表模型高度固定10%的风致压力和基础力矩的不同干扰条件。在当前工作条件下,研究得出结论,与方形平面形状模型相比,重塑三角形模型所经历的-1>干扰因子>1会导致仪器模型的性能降低。Remodel三角形模型在顺风和侧风方向上的前-前干扰条件具有最佳的整体性能,而Remodel三角形状模型的前-后干扰条件具有最好的扭转性能。应避免Remodel三角形模型的背靠背干扰,因为在本研究中调查的所有干扰条件下,重复模型的方向在顺风和侧风方向上都吸引了最大的倾覆力矩。
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引用次数: 13
Evaluation and fitting of a numerical model for reinforced concrete thin walls through experimental results of monotonic and cyclic loading tests 通过单调和循环荷载试验结果评估和拟合钢筋混凝土薄壁的数值模型
IF 1.2 4区 工程技术 Q2 Engineering Pub Date : 2021-07-19 DOI: 10.1590/1679-78256575
R. Ortega, Carlos Naranjo, P. Torres, C. Madera, J. Marulanda, P. Thomson, G. Areiza
Abstract Reinforced concrete thin walls buildings have become one of the most common alternatives for housing construction in Colombia. However, some studies on this system have reported that walls have a limited deformation capacity and may suffer brittle failures. In this paper, a numerical model developed in OpenSees was used to represent the behavior of thin and slender reinforced concrete walls. The model was evaluated and fitted with the experimental response of two representative walls of this type of construction in high seismic hazard zone, in addition to the results of cyclic tests of other investigations with walls of similar characteristics. The experimental response of the walls indicated that, despite reaching a moderate deformation capacity, for the 1% drift limit, the level of damage was severe and lost 77% and 67% of their initial stiffness, respectively, which confirms that their performance is limited and provides a warning that the design practices may be insufficient. The numerical simulation correlated well with the experimental response in terms of displacement capacity, strength, and hysteric behavior.
摘要钢筋混凝土薄壁建筑已成为哥伦比亚住房建设最常见的替代方案之一。然而,一些关于该系统的研究报告称,墙体的变形能力有限,可能会发生脆性破坏。在本文中,使用OpenSees中开发的数值模型来表示细长钢筋混凝土墙的行为。对该模型进行了评估,并将其与高地震危险区这类建筑的两个代表性墙的实验响应进行了拟合,此外还对其他具有类似特征的墙进行了循环试验。墙体的实验响应表明,尽管达到了中等变形能力,但对于1%的漂移极限,损伤程度严重,分别损失了77%和67%的初始刚度,这证实了其性能有限,并警告设计实践可能不足。数值模拟与实验响应在位移能力、强度和滞回特性方面有很好的相关性。
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引用次数: 5
期刊
Latin American Journal of Solids and Structures
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