Engineering Structures最新文献_第2页

Design and experimental study on seismic performance of RC modular superimposed shear walls with novel inter-module connection 采用新型模块间连接的 RC 模块化叠合剪力墙抗震性能的设计与实验研究

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-26 DOI: 10.1016/j.engstruct.2024.119356

Jiulin Bai , Biao Yang , Bin Xie , Jingwei Yang

Modular construction characteristic by higher construction efficiency, superior quality and fewer workers on site can fully leverage its advantages in high-rise buildings with numerous repeated modules. However, the widely applied core wall-based high-rise modular structures are still labor intensive and time consuming for the erection of the core walls. In this study, a new self-supporting high-rise reinforced concrete modular superimposed shear wall (RC-M-SSW) structural system, and an innovative inter-module connector with conservative design method is proposed. The RC-M-SSW comprises of two adjacent precast module wall panels, inter-module connectors, and post-cast self-compacting concrete between the precast wall panels. To investigate the seismic performance of the RC-M-SSWs, two full scale RC-M-SSWs and a reference cast-in-place shear wall were designed and tested under combined axial compression and lateral cycle loading. The results showed that the RC-M-SSWs had high lateral stiffness, excellent energy consumption capacity, good deformation performance and comparable load bearing capacity compared to the reference shear wall. Besides, the RC-M-SSWs employing the innovative connectors exhibited a good integrity during the cycle loading, and the effectiveness of the connection was demonstrated by the strains in the connectors. Finally, a refined numerical analysis was conducted and a design approach for predicting the load bearing capacity of the RC-M-SSWs was developed and validated with high accuracy.

模块化建筑具有施工效率高、质量好、现场工人少等特点，在重复模块较多的高层建筑中可以充分发挥其优势。然而，目前广泛应用的以核心墙为基础的高层模块化结构在核心墙的安装上仍需耗费大量人力和时间。本研究提出了一种新型自支撑高层钢筋混凝土模块化叠合剪力墙（RC-M-SSW）结构体系，以及一种创新的模块间连接器和保守的设计方法。RC-M-SSW 由两个相邻的预制模块墙板、模块间连接器和预制墙板之间的后浇自密实混凝土组成。为了研究 RC-M-SSW 的抗震性能，我们设计了两个全尺寸 RC-M-SSW 和一个现浇剪力墙，并在轴向压缩和横向循环组合荷载下进行了测试。结果表明，与基准剪力墙相比，RC-M-SSW 具有较高的侧向刚度、出色的耗能能力、良好的变形性能和相当的承载能力。此外，采用创新连接件的 RC-M-SSW 在循环加载过程中表现出良好的完整性，连接件的应变也证明了连接的有效性。最后，研究人员进行了精细的数值分析，开发出一种用于预测 RC-M-SSW 承载能力的设计方法，并对其进行了高精度验证。

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引用次数: 0

Bond performance of geopolymer concrete with bazalt/glass fiber under elevated temperature 土工聚合物混凝土与巴扎尔特/玻璃纤维在高温下的粘结性能

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-26 DOI: 10.1016/j.engstruct.2024.119368

Muhammed Himmet Sami Özdemir , Barış Bayrak , Abdulkadir Cüneyt Aydın

This manuscript aims to assess the bond performance of geopolymer concrete was elevated using pullout tests, in which the influences of fiber type (basalt and glass), bar diameter (8 mm and 16 mm and 24 mm), the position of steel rebar and high temperature (20 °C, 200 °C, 400 °C, 600 °C and 800 °C) were analyzed. Results from these tests show that rebar diameter is one of the key factor affecting the bond strength. Although increasing the bar diameter generally reduces the bond strength, in some samples the increase in the bar diameter increases the bond strength. On the other hand, experimental results in the case of high temperature present a great dispersion and high relation is observed between bond strength and high temperature. It was observed the bond strength of samples exposed to temperature of 200 °C increased, whereas bond strength of samples especially exposed to a temperature of 600 °C and 800 °C significant decreased. Therefore, it is possible to conclude that the location of rebar may have an important influence on the characterization of the bond as well as fiber type.

本手稿旨在通过拉拔试验评估土工聚合物混凝土的粘结性能，其中分析了纤维类型（玄武岩和玻璃纤维）、钢筋直径（8 毫米、16 毫米和 24 毫米）、钢筋位置和高温（20 °C、200 °C、400 °C、600 °C 和 800 °C）的影响因素。试验结果表明，钢筋直径是影响粘结强度的关键因素之一。虽然增加钢筋直径通常会降低粘接强度，但在某些样品中，钢筋直径的增加会提高粘接强度。另一方面，高温情况下的实验结果呈现出很大的分散性，并且可以观察到粘结强度与高温之间的高度关系。据观察，暴露在 200 °C 温度下的样品的粘接强度会增加，而暴露在 600 °C 和 800 °C 温度下的样品的粘接强度会显著降低。因此，可以得出结论：钢筋的位置和纤维类型可能对粘结的特性有重要影响。

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引用次数: 0

Effect of sedimentary V-shaped canyon on bridge seismic response considering fault dynamic rupture 考虑断层动态破裂的沉积 V 型峡谷对桥梁地震响应的影响

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-26 DOI: 10.1016/j.engstruct.2024.119315

Mingdong Wang , Wenzhe Wang , Shuai Li , Jingquan Wang , Fan Zhang , Shuang Li

Past earthquakes have shown that the canyon topography and sedimentary soil covering canyons directly influence the features of seismic waves and make the canyon-crossing bridge more fragile. The impacts of canyon topography on the seismic behaviors of these bridges have been numerically investigated using plane waves as excitations in existing literature; however, there are very limited studies on how both the canyon topography and sedimentary soil affect their seismic performance. This study focuses on the seismic performance of a three-span continuous bridge situated in a sedimentary V-shaped canyon considering the fault dynamic rupture. For this purpose, an entire physical model is established to simulate the fault dynamic rupture, attenuation in the propagation, and site effect by the Spectral Element Method (SEM). Three cases are simulated including flat land (FL), V-shaped canyon (VC), and sedimentary V-shaped canyon (SVC). The temporal and spatial distribution characteristics of ground motions in the case of the SVC are thoroughly investigated. Seismic responses of the bridge located in FL, VC, and SVC are analyzed and compared. The results showed that a higher initial shear stress results in a larger stress drop, which can enlarge the released energy of fault rupture. The SVC can cause significant spatial variation of ground motions. Both V-shaped canyon and sedimentary soil can amplify the amplitudes of velocity pulse. Compared with the VC, the sedimentary soil covering the canyon results in larger amplitude of velocity pulse. The seismic responses of the canyon-crossing bridge could be considerably increased by SVC. The maximum acceleration of the girder, bearings deformations, and pier base shear in the case of SVC increased by 55.5 %, 61.4 %−239 %, and 4 %−15 % compared to VC, respectively. The sedimentary V-shaped canyon effect in the seismic design of bridges can not be neglected.

过去的地震表明，峡谷地形和覆盖峡谷的沉积土直接影响地震波的特征，并使跨峡谷桥梁更加脆弱。现有文献已使用平面波作为激励，对峡谷地形对这些桥梁地震行为的影响进行了数值研究；但是，关于峡谷地形和沉积土如何影响桥梁地震性能的研究非常有限。本研究重点关注位于沉积 V 型峡谷中的三跨连续桥梁的抗震性能，并考虑了断层动态破裂。为此，建立了一个完整的物理模型，通过谱元法（SEM）模拟断层动态破裂、传播中的衰减和场地效应。模拟了三种情况，包括平地（FL）、V 型峡谷（VC）和沉积 V 型峡谷（SVC）。对 SVC 情况下地面运动的时空分布特征进行了深入研究。对位于 FL、VC 和 SVC 中的桥梁的地震响应进行了分析和比较。结果表明，较高的初始剪应力会导致较大的应力下降，从而扩大断层破裂的释放能量。SVC 可导致地震动的显著空间变化。V 形峡谷和沉积土均能放大速度脉冲的振幅。与 V 型峡谷相比，覆盖峡谷的沉积土会导致更大的速度脉冲振幅。SVC 可显著提高峡谷跨线桥的地震响应。与 VC 相比，SVC 条件下梁的最大加速度、支座变形和墩底剪力分别增加了 55.5%、61.4%-239% 和 4%-15%。沉积 V 型峡谷效应在桥梁抗震设计中不容忽视。

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引用次数: 0

Reinforcement for compression perpendicular to grain in column-base and -beam joints using partially threaded and fully threaded screws 使用部分螺纹螺钉和全螺纹螺钉对柱底座和梁连接处垂直于纹理的压缩进行加固

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-25 DOI: 10.1016/j.engstruct.2024.119334

Daisuke Kanagaki , Marina Totsuka , Takeo Hirashima , Hayato Kato

Reinforcement using self-tapping screws is an effective strategy for augmenting the bearing capacity and stiffness of timber beams subjected to compression perpendicular to the grains. This paper presents an experimental study on reinforcement using self-tapping screws for compression perpendicular to the grain. The bearing capacities and initial stiffness depended on various factors: wood species, screw information (diameter, arrangement, and thread configuration), and load conditions. For specimens with fully threaded screws in column-base joints, the experimental outcomes diverged from the predictions when a previously published calculation method was used for two primary reasons: (i) the predicted capacity for timber failure at the screw tips was less than the experimental values, and (ii) the capacity of single screws for buckling failure was underestimated. Therefore, we propose an enhanced equation to refine the calculation method (

R^{2} = 0.83

). It was observed that partially threaded screws provided a reinforcement effect, albeit inferior to that of fully threaded screws. This was owing to a deficiency in the pushing-in capacity of single screws. Additionally, the reinforcement effect in the column-beam joints was less than in the column-base joints. This is attributed to a gap in the strain distribution. Thus, in this study, we developed a new equation for partially threaded screws and column-beam joints.

使用自攻螺钉加固是提高木梁在垂直于纹理的压缩条件下的承载能力和刚度的有效策略。本文介绍了使用自攻螺钉进行垂直于纹理压缩加固的实验研究。承载能力和初始刚度取决于多种因素：木材种类、螺钉信息（直径、排列和螺纹结构）以及负载条件。对于柱基连接中使用全螺纹螺钉的试样，如果使用以前公布的计算方法，实验结果与预测结果存在偏差，主要原因有两个：(i) 螺钉顶端木材破坏的预测承载力小于实验值；(ii) 单个螺钉屈曲破坏的承载力被低估。因此，我们提出了一个增强方程来完善计算方法（R2=0.83）。我们观察到，部分螺纹螺钉具有加固效果，但不如全螺纹螺钉。这是因为单个螺钉的推入能力不足。此外，柱梁连接处的加固效果也不如柱基连接处。这是因为应变分布存在差距。因此，在本研究中，我们为部分螺纹螺钉和柱梁连接开发了一种新的方程。

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引用次数: 0

Buckling behavior of orthotropic thin plates using analytical and machine learning methods 利用分析和机器学习方法研究正交薄板的屈曲行为

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-25 DOI: 10.1016/j.engstruct.2024.119376

Salamat Ullah , Jincheng Zhang , Hu Bo , Jinghui Zhang , Muhammad Faisal Javed , Weiqiu Chen

Designing plate structures poses challenges due to potential instabilities and the complexities involved in obtaining accurate analytical solutions, especially for non-Lévy-type boundary conditions. This study employs the finite integral transform method to analyze the buckling behavior of orthotropic thin plates with complex boundary conditions. In solution procedure, the governing high-order partial differential equations are transformed into a system of linear algebraic equations, yielding exact and rapidly converging analytical solution. The method is simple and general and does not need to predetermine the deflection function. The correctness of the method is validated by comparison with numerical simulations performed using the ABAQUS software. Furthermore, Gene Expression Programming (GEP) is utilized to develop empirical models that predict buckling coefficients of isotropic and orthotropic plates under classical and non-classical boundary conditions. Material properties, aspect ratio, rotating fixed coefficient, and boundary conditions are used as input parameters, with simplified mathematical formulations to predict the buckling coefficient. Model performance is assessed using parametric analysis and statistical tests to ensure accuracy and generalization. Further investigation shows aspect ratio and rotating fixed coefficient are significant variables influencing buckling coefficients under classical and non-classical boundary conditions, respectively, followed by boundary conditions and material property. The performance of the GEP model is further assessed by comparing with linear and non-linear regression models. The results show that GEP outperforms the regression models, showing its higher prediction accuracy. This study not only addresses the challenges of designing thin plates with complex boundary conditions, but it also presents an effective machine-learning method for predicting buckling behavior. The analytical solution can be used as a benchmark for validating new analytical and numerical methods. The equations developed using GEP to predict the buckling coefficient of plates provide a useful tool for extrapolating results beyond the scope of this study.

由于潜在的不稳定性和获得精确分析解的复杂性，特别是非 Lévy 型边界条件，板结构的设计面临着挑战。本研究采用有限积分变换法分析了具有复杂边界条件的各向同性薄板的屈曲行为。在求解过程中，理事高阶偏微分方程被转化为线性代数方程组，从而得到精确且快速收敛的解析解。该方法简单通用，无需预先确定挠度函数。通过与使用 ABAQUS 软件进行的数值模拟比较，验证了该方法的正确性。此外，还利用基因表达编程（GEP）开发了经验模型，用于预测经典和非经典边界条件下各向同性和正交异性板的屈曲系数。材料属性、长宽比、旋转固定系数和边界条件被用作输入参数，并通过简化的数学公式来预测屈曲系数。模型性能通过参数分析和统计测试进行评估，以确保准确性和通用性。进一步的研究表明，在经典和非经典边界条件下，长宽比和旋转固定系数分别是影响屈曲系数的重要变量，其次是边界条件和材料特性。通过与线性和非线性回归模型进行比较，进一步评估了 GEP 模型的性能。结果表明，GEP 优于回归模型，显示出其更高的预测精度。这项研究不仅解决了具有复杂边界条件的薄板设计难题，还提出了一种预测屈曲行为的有效机器学习方法。分析解决方案可作为验证新的分析和数值方法的基准。使用 GEP 开发的方程可预测板材的屈曲系数，为推断本研究范围以外的结果提供了有用的工具。

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引用次数: 0

A rapid estimation method for the probability of wind-induced first plastic displacement of SDOF systems based on the Slepian model 基于 Slepian 模型的 SDOF 系统风致首次塑性位移概率快速估算方法

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-25 DOI: 10.1016/j.engstruct.2024.119350

Bo Chen , Wei Li , Jianbiao Jia , Zekang Wang

The conventional method based on the Slepian model for estimating the probability distribution of the first plastic displacement of an ideal elastic-plastic oscillator (EPO) is only applicable for zero-mean white noise loads. This study proposes an improved method applicable to wind loads with non-zero mean and non-white noise characteristics for structures whose resonant response dominates the fluctuating wind-induced response. The original EPO's symmetric constitutive model under non-zero mean loads is modified to be equivalent to an asymmetric constitutive model under zero mean loads; thus, a SDOF system subjected to non-zero mean loads is transformed into a SDOF system under zero mean loads. When the resonant response dominates the fluctuating wind-induced response, the fluctuating wind-induced response can be approximated as a narrow-band stochastic process, the extreme values following a Rayleigh distribution, and the probability distribution of the local maximum displacement of the associated linear oscillator (ALO) can be directly obtained, making the Slepian model-based method applicable for non-white noise loads. A case study is performed to validate the accuracy of the proposed improved method, and the results demonstrate that the improved method proposed in this study can significantly enhance computational efficiency. The accuracy of the improved method is independent of the load characteristics but rather depends on the narrowband characteristics of the structural response. When the narrowband characteristics of the structural response are prominent, the improved method exhibits high accuracy.

基于 Slepian 模型估算理想弹塑性振荡器（EPO）第一塑性位移概率分布的传统方法仅适用于零均值白噪声荷载。本研究提出了一种改进方法，适用于具有非零均值和非白噪声特性的风荷载，适用于共振响应主导风引起的波动响应的结构。原 EPO 在非零均值荷载下的对称构成模型被修改为等效于零均值荷载下的非对称构成模型；因此，承受非零均值荷载的 SDOF 系统被转换为零均值荷载下的 SDOF 系统。当共振响应主导风致波动响应时，风致波动响应可近似为窄带随机过程，其极值遵循瑞利分布，并可直接获得相关线性振荡器（ALO）局部最大位移的概率分布，从而使基于 Slepian 模型的方法适用于非白噪声载荷。为验证所提改进方法的准确性，进行了一项案例研究，结果表明本研究提出的改进方法能显著提高计算效率。改进方法的精度与荷载特性无关，而是取决于结构响应的窄带特性。当结构响应的窄带特征突出时，改进方法就会表现出很高的精度。

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引用次数: 0

Combined effects of long-term cyclic loading and unidirectional flow induced scour on the mechanical responses of tetrapod jacket foundation supported offshore wind turbines 长期循环载荷和单向流引起的冲刷对支撑海上风力涡轮机的四柱夹套基础机械响应的综合影响

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-24 DOI: 10.1016/j.engstruct.2024.119378

Hanbo Zheng , Fayun Liang , Hao Zhang , Lin Li

To avoid the complexities of constructing embedded rock piles, large diameter pile jacket foundations have recently been employed for deploying offshore wind turbines. The offshore wind turbines endure the long-term effects of complex marine environmental factors, including the combined effects of complex lateral loads and local scour, which pose significant challenges to their bearing capacity and deformation control. This paper presents a series of flume model tests for a tetrapod jacket foundation-supported offshore wind turbine considering the large-diameter characteristics of the base piles. A compact and reliable loading device is utilized to synchronously apply long-term cyclic lateral loading and unidirectional flow induced scour. The mechanical responses of the superstructure-foundation system and the local scour development are investigated, with special attention given to long-term cumulative deformation, natural frequency migration, ultimate bearing capacity, and scour depth development. By comparing these findings with a previous experiment for monopile conducted by the authors, the observed phenomena in this paper are explained and analyzed. The results of this study will enable more precise evaluations of the long-term mechanical responses of a newly installed large diameter pile-jacket foundations supported offshore wind turbines.

为了避免埋入式岩石桩施工的复杂性，最近在部署海上风力涡轮机时采用了大直径桩套地基。海上风力涡轮机要长期承受复杂海洋环境因素的影响，包括复杂侧向荷载和局部冲刷的综合影响，这对其承载能力和变形控制提出了巨大挑战。考虑到基桩的大直径特性，本文针对四足夹层基础支撑的海上风力涡轮机进行了一系列水槽模型试验。利用紧凑可靠的加载装置同步施加长期循环侧向加载和单向流诱导冲刷。研究了上部结构-地基系统的力学响应和局部冲刷发展，特别关注了长期累积变形、固有频率迁移、极限承载力和冲刷深度发展。通过将这些研究结果与作者之前进行的单桩实验进行比较，本文对观察到的现象进行了解释和分析。这项研究的结果将有助于更精确地评估新安装的支撑海上风力涡轮机的大直径桩套地基的长期机械响应。

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引用次数: 0

Experimental and numerical studies on the axial compressive performance of localized corroded circular steel tubes 局部腐蚀圆钢管轴向抗压性能的实验和数值研究

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-24 DOI: 10.1016/j.engstruct.2024.119352

Wenhao Liu , Yuxuan Zhang , Bin Zeng , Zhen Zhou

The corrosion issue of steel structures is becoming increasingly prominent, and the study of the axial compressive performance of localized circular steel tubes (LCCSTs) is crucial for evaluating the safety of large-span steel structures. In this work, the electrochemically accelerated corrosion method is employed to simulate the localized corrosion of circular steel tube (CST) members, and the relative corrosion depth of the corrosion region is found to follow a normal distribution with a coefficient of variation of 0.44 through three-dimensional morphological scanning. Furthermore, the effects of different parameters on the failure modes and axial compressive performance of the CST members are investigated through experiments. The uncorroded members are characterized mainly by overall buckling, whereas the corroded members exhibit local buckling. In addition, the ultimate load capacity decreases by at least 30.7 % when the corrosion ratio increases from 15 % to 30 % and by a maximum of 6.3 % when the circumferential corrosion ratio increases from 0.5 to 1.0. Next, a refined finite element (FE) model of the LCCST members is developed. A comparison with the test results shows that the developed refined FE model can better simulate the failure modes and axial compressive performance of LCCST members. Parametric analyses based on the validated FE model are conducted, and the results reveal that the slenderness ratio, corrosion ratio, and circumferential and longitudinal corrosion ratios significantly affect the load capacity degradation coefficient of the members. Finally, based on the test and FE results, a formula for calculating the axial compressive load capacity while considering the effect of localized corrosion is established, and the comparison results reveal that most of the errors between the predicted values and the FE and test values do not exceed 10 %. Furthermore, 65 previous experimental data points of LCCSTs are collected, and the comparison reveals that the errors between the predicted values and the previous test results are mostly controlled within 20 %, which further verifies the accuracy and applicability of the formula for calculating the axial compressive load capacity of LCCST members.

钢结构的腐蚀问题日益突出，研究局部圆钢管（LCCST）的轴向抗压性能对于评估大跨度钢结构的安全性至关重要。本研究采用电化学加速腐蚀法模拟圆钢管（CST）构件的局部腐蚀，通过三维形态扫描发现腐蚀区域的相对腐蚀深度服从正态分布，变异系数为 0.44。此外，还通过实验研究了不同参数对 CST 构件失效模式和轴向抗压性能的影响。未腐蚀构件主要表现为整体屈曲，而腐蚀构件则表现为局部屈曲。此外，当腐蚀率从 15% 增加到 30% 时，极限承载能力至少降低了 30.7%；当圆周腐蚀率从 0.5 增加到 1.0 时，极限承载能力最多降低了 6.3%。接下来，我们建立了 LCCST 构件的精细有限元 (FE) 模型。与测试结果的比较表明，所开发的精炼有限元模型能更好地模拟 LCCST 构件的失效模式和轴向抗压性能。根据验证后的 FE 模型进行了参数分析，结果表明，细长比、腐蚀比以及周向和纵向腐蚀比对构件的承载能力衰减系数有显著影响。最后，根据试验和 FE 结果，建立了考虑局部腐蚀影响的轴向抗压承载力计算公式，对比结果表明，预测值与 FE 值和试验值之间的误差大多不超过 10%。此外，还收集了 65 个以前的 LCCST 试验数据点，对比结果表明，预测值与以前的试验结果之间的误差大多控制在 20% 以内，这进一步验证了 LCCST 构件轴向抗压承载力计算公式的准确性和适用性。

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引用次数: 0

A novel multistable honeycomb structure with tailored variable-length functions 具有定制变长功能的新型多稳态蜂窝结构

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-24 DOI: 10.1016/j.engstruct.2024.119354

Ruixin Wang , Bin Niu , Wei Tan

The multistable honeycomb (MSHC) has excellent application prospects in the field of lightweight deformable structures. This study presented a novel MSHC structure with a tailored function that can achieve stable and reversible changes in structural length, consisting of four-pointed star-shaped honeycomb component and cosine curve beam component, fabricated by Fused deposition modeling (FDM) additive manufacturing technology. Experimental and numerical simulations under axial compression and three-point bending tests were conducted. The effects of MSHC structure parameters (span, height and thickness of bistable beam, and the honeycomb wall angles) on the mechanical properties were systematically analyzed. It was found that the mechanical properties were affected by the height-thickness ratio and span-height ratio of the cosine curved beam bistable structure significantly, and were slightly affected by the honeycomb wall angles. Finally, a span morphing airfoil segment for wind turbine blade, based on the novel MSHC structure, was designed, and its CFD analysis was conducted. It was observed that the lift force is positively associated with the length of the variable-length airfoil segment. The morphing airfoil can adjust its lift force within a specific range by utilizing the structural length variability, which verifies the potential of this novel MSHC in the field of load-bearing deformable structures.

多稳蜂窝（MSHC）在轻质可变形结构领域具有良好的应用前景。本研究提出了一种具有量身定制功能的新型 MSHC 结构，可实现稳定且可逆的结构长度变化，该结构由四点星形蜂窝组件和余弦曲线梁组件组成，采用熔融沉积成型（FDM）增材制造技术制造。对轴向压缩和三点弯曲试验进行了实验和数值模拟。系统分析了 MSHC 结构参数（双稳态梁的跨度、高度和厚度以及蜂窝壁角）对力学性能的影响。结果发现，余弦弯梁双稳态结构的高厚比和跨高比对力学性能的影响较大，而蜂窝壁角对力学性能的影响较小。最后，基于新型 MSHC 结构设计了风力涡轮机叶片的跨度变形翼段，并对其进行了 CFD 分析。结果表明，升力与变长机翼段的长度呈正相关。通过利用结构长度的可变性，变形翼面可在特定范围内调节升力，这验证了新型 MSHC 在承载可变形结构领域的潜力。

{"title":"A novel multistable honeycomb structure with tailored variable-length functions","authors":"Ruixin Wang , Bin Niu , Wei Tan","doi":"10.1016/j.engstruct.2024.119354","DOIUrl":"10.1016/j.engstruct.2024.119354","url":null,"abstract":"<div><div>The multistable honeycomb (MSHC) has excellent application prospects in the field of lightweight deformable structures. This study presented a novel MSHC structure with a tailored function that can achieve stable and reversible changes in structural length, consisting of four-pointed star-shaped honeycomb component and cosine curve beam component, fabricated by Fused deposition modeling (FDM) additive manufacturing technology. Experimental and numerical simulations under axial compression and three-point bending tests were conducted. The effects of MSHC structure parameters (span, height and thickness of bistable beam, and the honeycomb wall angles) on the mechanical properties were systematically analyzed. It was found that the mechanical properties were affected by the height-thickness ratio and span-height ratio of the cosine curved beam bistable structure significantly, and were slightly affected by the honeycomb wall angles. Finally, a span morphing airfoil segment for wind turbine blade, based on the novel MSHC structure, was designed, and its CFD analysis was conducted. It was observed that the lift force is positively associated with the length of the variable-length airfoil segment. The morphing airfoil can adjust its lift force within a specific range by utilizing the structural length variability, which verifies the potential of this novel MSHC in the field of load-bearing deformable structures.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"324 ","pages":"Article 119354"},"PeriodicalIF":5.6,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Influence of plate vibration on delamination formation in composites under multiple impacts 板振动对多重冲击下复合材料分层形成的影响

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2024-11-24 DOI: 10.1016/j.engstruct.2024.119336

L. Huo , X. Gong , Z. Cao , M. Zhang , Y. Cao , X. Li , W. Tu

Dynamic vibration is believed to be a basic property of the impacted composite laminates; however, its effect on delamination formation requires further investigation. This study proposes a numerical model in collaborating with ABAQUS, which was calibrated using experimental results, to investigate the effect of plate vibration on delamination formation in composite laminates subjected to two consecutive identical ice or steel projectile impacts with a fixed loading distance. The only variable parameter for the different simulations was the time interval between the two impacts. The loading condition considered in this study is an extreme case where the composite laminate was still vibrating after the first impact when the second impact occurred. The results showed that the delaminations that formed later were significantly affected by the time intervals of the two identical successive ice or steel projectiles. As the vibrated impact points travel from the minimum peak to the adjacent maximum peak during the first vibration period, the newly formed delamination areas monotonically increase with time and vice versa. The change in the maximum contact forces of two identical impacts induced by dynamic vibration is suggested to be a major reason for the discrepancy between the newly formed delamination and previous ones.

动态振动被认为是受到冲击的复合材料层压板的一个基本特性；然而，其对分层形成的影响还需要进一步研究。本研究提出了一个与 ABAQUS 协作的数值模型，并利用实验结果对该模型进行了校准，以研究板振动对在固定加载距离下受到两次连续相同冰或钢弹丸冲击的复合材料层压板分层形成的影响。不同模拟的唯一可变参数是两次撞击之间的时间间隔。本研究中考虑的加载条件是一种极端情况，即复合材料层压板在第一次撞击后仍在振动，此时发生第二次撞击。结果表明，后来形成的分层受两次相同的连续冰弹或钢弹的时间间隔影响很大。随着振动冲击点从第一次振动期间的最小峰值移动到相邻的最大峰值，新形成的分层面积随时间单调增加，反之亦然。动态振动引起的两次相同撞击的最大接触力的变化被认为是新形成的分层与之前的分层之间存在差异的主要原因。

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引用次数: 0