Engineering Structures最新文献_第8页

A data-driven inverse design framework for tunable phononic crystals

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-04 DOI: 10.1016/j.engstruct.2024.119599

Huamao Zhou, Ning Chen, Baizhan Xia, Xianfeng Man, Jian Liu

Soft phononic crystals have significant advantages for tuning bandgaps and undergoing reversible large deformations. Despite the superior tunability performance of soft phononic crystals, most existing research methods typically rely on iterative searching aided by researchers’ experience and optimization algorithms to obtain a structure with desired properties. In this paper, we develop an inverse design framework based on deep learning methods. The framework combines Residual Network (ResNet) and Conditional Generative Adversarial Network (CGAN) to establish a bidirectional relationship between tunable phononic crystal structures and their dispersion relations. The results show that the framework can accurately predict the dispersion relations for given structures and design near-optimal structures for the given dispersion relations through a statistical optimization strategy. In addition, the framework can be used to design structures with specific bandgaps. The developed framework can accelerate the design process of tunable phononic crystals and provide new solutions for material design research.

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引用次数: 0

Investigation on aeroelastic effects of high-rise buildings based on three-dimensional forced vibration wind tunnel tests

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-04 DOI: 10.1016/j.engstruct.2024.119556

Xingyan Fan , Lianghao Zou , Gang Hu , Jie Song , Xingxia Wu , Rongjie Pan

Most of conventional forced vibration systems consider only one-dimensional (1D) structural vibration of high-rise buildings and do not account for aeroelastic coupling effects when determining aeroelastic parameters. In the present study, the motivation-feedback mechanism is introduced to account for aeroelastic coupling effects. In addition, synchronous three-dimensional (3D) vibrations of the building model are achieved by employing a 3D forced vibration system. Aeroelastic parameters including aerodynamic damping and aerodynamic stiffness ratios are determined using the wind pressure and structural displacement responses measured from wind tunnel tests. The two aeroelastic parameters obtained from 3D forced vibration wind tunnel test are then compared with those from 1D forced vibration wind tunnel test, to indicate the meaning of synchronous 3D vibrations. Effects of aeroelastic coupling on the aeroelastic parameters are investigated systematically. In addition, effects of structural vibration frequency and amplitude on the two aeroelastic parameters are examined, and an expression for the aerodynamic damping ratio is proposed based on regression analysis. Results show that alongwind aeroelastic parameters are barely influenced by vibrations in the crosswind and torsional directions. However, either crosswind or torsional aeroelastic parameters are significantly affected by vibrations in both crosswind and torsional directions, demonstrating the considerable aeroelastic coupling between these two directions. Within the range of vortex lock-in wind speeds, the absolute value of the minimum of both aeroelastic stiffness and damping ratios gradually decreases with the increase of structural vibration amplitude; whereas the absolute value of the minimum of both aeroelastic stiffness and damping ratios increases with the structural vibration frequency.

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引用次数: 0

Experimental behaviour of concrete-filled double-skin corrugated steel tubes under eccentric compression

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-04 DOI: 10.1016/j.engstruct.2024.119593

Bo Lu , Hua Yang , Yong Fang

Concrete-filled double-skin corrugated steel tube (CFDCST) is a novel type of hollow section steel-concrete composite member comprising inner and outer layers of galvanized corrugated steel tubes (CSTs) with an interlayer of hollow reinforced concrete (HRC). Previous studies have clarified its behaviour under axial compression. This study further conducted an experimental investigation on 14 large-scale short specimens subjected to eccentric compression, including 11 CFDCST and 3 HRC specimens. The experimental variables are eccentricity ratios, hollow ratios, outer CST thicknesses, and longitudinal reinforcement ratios. The failure modes, load–lateral displacement curves, key mechanical indicators, and strain/stress distributions were analyzed, with the working mechanisms addressed. The experimental results indicate that the CFDCST specimens exhibited desirable mechanical performance and high structural efficiency. The failure modes and mechanical performances showed effective improvement compared to the HRC specimens with the same reinforcement configuration. Specifically, the compressive bearing capacity improved by 32.2–34.9 %, while the ductility index increased by 68.5–115.2 %. The outer thin-walled CSTs provided high-level confinement while the inner thin-walled CSTs effectively maintained the cross-section integrity to prevent performance deterioration. Ultimately, the bearing capacity prediction methods for CFDCST members under eccentric compression are discussed, with design suggestions proposed.

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引用次数: 0

Seismic performance assessment of bridges isolated by a new restorable cable-sliding bearing

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-03 DOI: 10.1016/j.engstruct.2024.119578

Jinhai He , Zhenyong Han , Yutao Pang , Wancheng Yuan

Although a large number of girder bridges use frictional flat sliding bearings to support bridge superstructures, these bearings may have excessive seismic displacement caused by strong earthquake due to the absence of the restorable ability. To improve the restorable ability, this paper presented a novel seismic isolation bearing based on flat sliding bearing and restorable cable restrainers, called Restorable Cable-sliding Bearing (RCB). The restorable cable restrainers in RCB are made up of steel cables and springs, which are used to limit large displacement and provide restorable forces for flat sliding bearings. In this paper, quasi-static tests were first conducted to study the seismic behavior of RCB, which was also used to calibrate analytical and numerical simulation methods. The effectiveness of RCB was then illustrated by a typical two-span reinforced concrete bridge. By comparing with flat sliding bearings, both nonlinear time-history analysis and fragility analysis were performed to study seismic performance of RCBs. Finally, a new factor based on the fragility difference between different components was also proposed to demonstrate the effectiveness of RCB on bridge system. It can be found that the proposed RCB can improve the restorable ability of flat sliding bearings, which can limit the excessive displacement and produce relatively small residual displacement under strong earthquakes.

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引用次数: 0

Experimental behaviour of concrete-filled double-skin corrugated steel tubes under combined compression and cyclic lateral loads

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-03 DOI: 10.1016/j.engstruct.2024.119545

Bo Lu , Yong Fang , Yuyin Wang , Hua Yang , Hao Li

Concrete-filled double-skin corrugated steel tube (CFDCST), as a novel high-performance hollow section composite member, is formed by positioning thin-walled galvanized corrugated steel tubes (CSTs) at the outer and inner walls of hollow reinforced concrete. It is suitable for the application of piers, towers, and offshore platforms owing to the improved mechanical performance, corrosion resistance, and construction convenience due to the benefits provided by the CSTs. Based on the previous studies on its compressive behaviour, this paper further investigates its mechanical performance under combined compression and cyclic lateral loads. A total of 10 large-scale specimens were tested, with experimental variables of specimen types, axial compression ratios, hollow ratios, and outer CST thicknesses. The failure modes, hysteresis curves, key mechanical indicators, and strain distributions were discussed carefully. The experimental results indicated that the novel CFDCST specimens exhibited ductile flexural failure modes, and the hysteretic behaviour was significantly improved compared with the HRC specimens. Based on these analyses, the working mechanism was revealed and the specific design recommendations were proposed. Ultimately, two typical prediction models for similar members were modified and validated to predict the axial load–bending moment interaction diagram of CFDCST members.

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引用次数: 0

Post-fire capacity of aluminium alloy rectangular hollow sections under compression

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-03 DOI: 10.1016/j.engstruct.2024.119602

Yao Sun , Ganghao Han

This paper presents experimental and numerical investigations on the post-fire residual capacities of aluminium alloy rectangular hollow sections under compression. A testing programme was firstly carried out, including heating tests, seven post-fire material tensile coupon tests and fourteen post-fire stub column tests. Following the testing programme, a numerical modelling programme was conducted, where the finite-element models on the post-fire stub columns were developed and validated against the test results. The validated numerical models were then used in parametric studies to derive more post-fire capacity data. Based on the test and numerical data, a design analysis was performed, where the applicability of the current international design codes to the post-fire design of aluminium alloy rectangular hollow sections was evaluated. The results reveal that all considered design codes generally lead to conservative residual compression capacity for post-fire aluminium alloy rectangular hollow sections, especially for those after exposure to the temperatures of 250 °C to 500 °C, owing to the neglect of post-fire material strain-hardening effect. Then, the continuous strength method that considers the material strain-hardening effect, was evaluated and found to result in significant design improvement.

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引用次数: 0

3D-printed functionally graded concrete plates: Concept and bending behavior

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-03 DOI: 10.1016/j.engstruct.2024.119551

Hou-Qi Sun , Jun-Jie Zeng , Guang-Yao Hong , Yan Zhuge , Yue Liu , Yamei Zhang

Three-dimensional concrete printing (3DCP), as an innovative technology, has become increasingly popular owing to advantages such as cost-effectiveness, labor-saving, free of formwork and materials-saving. Using the layer-by-layer construction technique enabled by 3DCP, functionally graded concretes with different ultimate tensile strain (UTS) capacities are proposed in this paper, leading to an optimum design of concrete plates. Three types of concrete, which are designed to have different UTS capacities, namely engineering cementitious composites (ECC), normal concrete (NC) and gepolymer concrete (GC), are developed. Six groups of 3D-printed functionally graded concrete plates are fabricated and tested under bending. The results revealed that the load-bearing capacity of FGC-3–2–1 was comparable to that of ECC plates, while FGC-1–2–3 exhibited the lowest load-bearing and deformation capacities. Increasing the number of ECC layers enhanced both the load-bearing and deformation capacities. Conversely, changing the number of GC and NC layers when the number of ECC layers remained constant resulted in similar performance. Additionally, using ECC as a reinforcing layer for 3D-printed concrete structures significantly improved their load-bearing and deformation capacities. These findings suggest that the proper design of functionally graded concrete can substantially reduce the CO₂ of concrete plates without compromising their mechanical properties. Finally, a theoretical model based on bond-slip laws was proposed and validated against the test results, providing valuable insights for the design and optimization of 3D-printed concrete structures.

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引用次数: 0

Enhancing failure mode classification of RC beam-column joints using logistic regression and hybrid sampling strategy

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-03 DOI: 10.1016/j.engstruct.2024.119542

Zecheng Yu , Bo Yu , Bing Li

Seismic failure mode of reinforced concrete (RC) beam-column joints (BCJs) is crucial for the safety and integrity of RC building or structure withstanding seismic forces. However, traditional classification methods are biased towards estimating majority samples and often misclassify minority samples due to imbalanced data distributions, leading to unexpected classifications for seismic failure modes of BCJs. To address the challenge of imbalanced data in classifying seismic failure modes of BCJs, an innovative imbalanced classification method based on logistic regression (LR) and hybrid sampling strategy is proposed. The method was compared with traditional shear-resistance design methods and LR models based on 197 sets of experimental data. Results demonstrate that the proposed method consistently outperforms traditional approaches. Specifically, the proposed method maintains higher values for K_a and M_cc, even as the class imbalance ratio increases, indicating its robustness in handling imbalanced data. The proposed imbalanced classification method offers several advantages over traditional approaches and a promising tool for accurately classifying seismic failure modes of BCJs, even in the presence of imbalanced data.

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引用次数: 0

A DSF-net-based approach to dual-branch instance segmentation of weak bridge defects

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-03 DOI: 10.1016/j.engstruct.2024.119583

He Zhang , Ruihong Shen , Jiawei Lei , Zhijing Shen , Zhicheng Zhang , Yuhui Zhou

Restricted by the uniqueness of bridge structures and safety requirements of imaging devices, there are numerous challenges in computer vision-based identification of structural surface bridge damage, such as weak defects segmentation, background noise interference, and the difficulty of simultaneously detecting bridge defects with varying morphologies. To address this issue, an efficient dual-branch instance segmentation method for weak defects detection, called DSF NET, has been proposed. Considering the morphological differences among different bridge defects, the Multi-Defect Classification (MDC) Module is introduced to classify the defects into thin tubular defects, which are addressed with dynamic snake convolution(DSConv) for flexible feature extraction, and common small defects. Moreover, the problem of high proportion of weak defects and the serious imbalance of defect categories, a new multi-scale feature fusion network (IFPN) is proposed to enhance the ability to process detailed information of bridge defects. Additionally, Convolutional Block Attention Module(CBAM) was applied to enhance local features and suppress background noise and useless information. After training and optimization of DSF NET, the Mean Average Precisions for masks of tubular defects and common small defects have improved from 5.26 % to 34.92 % and 20.75–77.81 % respectively. Results demonstrate that integrating DSConv into the convolution blocks at lower stages significantly improves the performance of the model, markedly enhancing defect detection capabilities. The proposed method has the potential to provide an intelligent tool for weak bridge defect detection.

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引用次数: 0

Seismic vibration control of monopile supported offshore wind turbines by tuned mass dampers considering seabed liquefaction

IF 5.6 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2025-01-03 DOI: 10.1016/j.engstruct.2024.119596

Lijun Pan , Rui He

Seismic vibrations and site liquefaction are of great concern in offshore wind engineering, as many offshore wind turbines (OWTs) have been constructed in seismically active areas with sandy seabed. Previous studies have reported that tuned mass dampers (TMDs) with precise tuning are an effective means of controlling seismic excessive vibrations of OWTs. However, liquefaction can change the natural frequencies of OWTs, and the potential failure of tuning-sensitive TMDs is not fully appreciated. The aim of this study is to investigate the vibration control of OWTs by single/dual TMDs under the co-actions of earthquakes and seabed liquefaction. Firstly, a nonlinear model is established to simulate the seismic response of a monopile supported 5 MW OWT in sandy sites, and the effect of liquefaction on the soil-structure interaction (SSI) is considered. In addition to the observed significant threat of strong earthquakes to the safety service, liquefaction can result in a notable reduction in the first two natural frequencies of the OWT. TMDs are believed to mitigate the negative impacts of potential liquefaction. Secondly, a linear elastic two-degrees-of-freedom (2DOFs) analytical model of OWT-TMD is presented to optimize the TMDs, and the effect of liquefaction on the OWT is simplified as frequency drops of the first two eigenfrequencies. The 2DOFs linear theory is chosen due to its high efficiency and wide applicability. Finally, the feasibility of the proposed method is validated, and it is found that the dual TMDs optimized based on the proposed linear theory are effective and robust for OWT’s nonlinear seismic vibration with possible soil liquefaction.

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引用次数: 0