Structures最新文献_第2页

Cracking behavior and flexural performance of fiber-reinforced RC beams subjected to cryogenic freeze-thaw cycles under static and repeated loading: Experimental and theoretical analysis 低温冻融循环下纤维增强RC梁的开裂行为和抗弯性能：实验和理论分析

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-28 DOI: 10.1016/j.istruc.2026.111201

Yang Li , Yongqi Chen , Wei Hu , Yifan Wang , Chaojie Yuan , Jiangkun Zhang

In cold climate regions, concrete structures are subjected to cryogenic freeze–thaw (FT) cycles, raising concerns about long-term durability. Although interest in the performance of fiber-reinforced concrete (FRC) beams under FT conditions has grown, extending to ultra-low-temperature and repeated loading remains limited. This paper investigates the effects of cryogenic FT cycles and loading conditions (static and repeated) on cracking behavior and flexural performance of fiber-reinforced concrete beams. The results indicate that more cryogenic FT cycles and lower minimum temperatures reduce the cracking moment and flexural strength of RC beams. Specifically, after six FT cycles, the cracking load and ultimate load decreased by 25.62 % and 17.35 %, respectively. Moreover, HFRC beams enhanced cracking moment by 23.41 %, ultimate load by 22.47 % and equivalent stiffness by 59.8 % under three FT cycles. Furthermore, the incorporation of hybrid fibers mitigated the residual deflection induced by repeated loading, reducing it by 0.41 mm, 0.31 mm, and 0.21 mm in the Δ1, Δ2, and Δ3 stages, respectively. Theoretical calculation models for cracking moments, ultimate load-bearing capacity, and flexural deflection were proposed through sectional strain analysis. Finally, based on bond-slip theory and composite mechanics, theoretical formulas were developed to calculate flexural crack widths under static and repeated loading after exposure to cryogenic FT cycles.

在寒冷气候地区，混凝土结构受到低温冻融（FT）循环，引起了对长期耐久性的关注。尽管人们对纤维增强混凝土（FRC）梁在FT条件下的性能越来越感兴趣，但延伸到超低温和重复加载仍然有限。本文研究了低温FT循环和加载条件（静态和重复）对纤维混凝土梁的开裂行为和抗弯性能的影响。结果表明，低温FT循环次数越多，最低温度越低，RC梁的开裂弯矩和抗弯强度降低。其中，6次FT循环后，开裂荷载和极限荷载分别下降25.62% %和17.35% %。在3次FT循环作用下，HFRC梁的开裂弯矩提高了23.41 %，极限荷载提高了22.47 %，等效刚度提高了59.8 %。此外，混杂纤维的掺入减轻了重复加载引起的残余挠度，在Δ1、Δ2和Δ3阶段分别减少了0.41 mm、0.31 mm和0.21 mm。通过截面应变分析，提出了开裂弯矩、极限承载力和受弯挠度的理论计算模型。最后，基于黏结滑移理论和复合力学，建立了低温FT循环后静载荷和重复载荷下弯曲裂纹宽度的理论计算公式。

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引用次数: 0

Topology optimization of locally resonant metamaterials for high modal effective mass 高模态有效质量局部共振材料的拓扑优化

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-28 DOI: 10.1016/j.istruc.2026.111192

Vanessa Cool , Willem Jaspers , Claus Claeys , Elke Deckers

Locally resonant metamaterials have emerged as a promising lightweight solution for the attenuation of noise and vibration through subwavelength resonance phenomena. However, their design largely relies on expert-driven intuition, frequently resulting in resonator configurations with suboptimal utilization of the used mass, as quantified by low modal effective mass (MEM) values. This work presents a topology optimization framework to systematically design metamaterial resonators to targeted frequencies while focusing on the efficient dynamic mass-usage by maximizing the corresponding MEM in the out-of-plane translational direction. Five distinct resonator mechanisms result from the optimization, ranging from well-known cantilever designs with low mass-efficiency to intricate double-lever and curved-leg resonators achieving MEM-values of more than 95%, demonstrating the potential of near-ideal utilization of the available mass. The optimization automates the selection and tuning of the best performing higher order modes with high overall displacement in the out-of-plane direction, contrary to classical manual design which uses the first bending mode. One of the obtained curved-leg resonators with a MEM of

96.2

% is further fabricated and experimentally validated on both the resonator and finite plate levels. The findings demonstrate the feasibility of designing lightweight locally resonant metamaterials that fully exploit the dynamic potential of the utilized mass without prior assumptions about the resonator geometry or targeted mode.

局部共振超材料已成为一种有前途的轻量化解决方案，用于通过亚波长共振现象衰减噪声和振动。然而，它们的设计很大程度上依赖于专家驱动的直觉，经常导致谐振器配置与使用质量的次优利用率，如低模态有效质量（MEM）值量化。本文提出了一种拓扑优化框架，可以系统地将超材料谐振器设计到目标频率，同时通过最大化面外平移方向上相应的MEM来关注有效的动态质量利用率。优化产生了五种不同的谐振器机制，从众所周知的低质量效率的悬臂设计到复杂的双杠杆和弯曲腿谐振器，其meme值超过95%，展示了接近理想的可用质量利用率的潜力。与传统的使用第一弯曲模态的人工设计相反，该优化可以自动选择和调整在面外方向上具有高总位移的最佳高阶模态。进一步制作了MEM为96.2%的曲腿谐振器，并在谐振器和有限板水平上进行了实验验证。这些发现证明了设计轻量级局部谐振超材料的可行性，该材料可以充分利用所利用质量的动态潜力，而无需预先假设谐振腔的几何形状或目标模式。

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引用次数: 0

The load-displacement characteristics of corroded reinforced concrete members as revealed by structural experiments and finite element analysis 通过结构试验和有限元分析，揭示了锈蚀钢筋混凝土构件的荷载-位移特性

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-28 DOI: 10.1016/j.istruc.2026.111214

Kyungjin Kim , Ji-Hyeon An , Bok-Gi Lee , Ju-Seong Jung , Kang-Seok Lee

It is essential to investigate the effects of corrosion-damaged reinforced concrete (R/C) members on the overall seismic performance of structures. It then becomes possible to assess more accurately the seismic safety of R/C buildings that include corroded components such as beams and columns. However, the existing guidelines for seismic evaluation of R/C structures—such as FEMA 310 and the Standard for Seismic Evaluation of Existing Reinforced Concrete Buildings by the Japan Building Disaster Prevention Association—do not consider deterioration, including rebar corrosion, when assessing seismic performance. Although previous experimental and analytical studies on corroded R/C members reported quantitative reductions in the load-carrying capacity, few studies have investigated hysteretic characteristics related to member strength and deformability or used finite element analysis incorporating bond degradation caused by rebar corrosion. In short, the seismic performance of R/C structures with corrosion-damaged members should be quantitatively and directly evaluated by reference to any reduction in performance based on the strength–deformation capacity as reflected in the hysteresis characteristics. To assess the seismic capacity of corroded R/C structures, it is essential to analyze the strength–deformation behavior of damaged members across the cracking, yielding, and final performance stages. This study investigated the effects of corrosion on the restoring force of RC flexural and shear beams. Following electrochemical accelerated corrosion and monotonic loading tests, a finite element model was developed using a bond stress–slip relationship to simulate bond strength loss. The model was validated against experimental data and used to predict the behavior of beams with corrosion levels not covered in the physical tests. Strength–deformation characteristics were then analyzed across the cracking, yielding, and ultimate performance stages.

研究钢筋混凝土构件腐蚀损伤对结构整体抗震性能的影响是十分必要的。这样就可以更准确地评估包括梁和柱等腐蚀部件的R/C建筑的地震安全性。然而，现有的钢筋混凝土结构抗震评估指南——如FEMA 310和日本建筑防灾协会的《现有钢筋混凝土建筑抗震评估标准》——在评估抗震性能时并未考虑劣化，包括钢筋腐蚀。虽然之前对腐蚀R/C构件的实验和分析研究报告了承载能力的定量降低，但很少有研究调查与构件强度和变形能力相关的滞后特性，或者使用包含钢筋腐蚀引起的粘结退化的有限元分析。简而言之，构件腐蚀损伤的钢筋混凝土结构的抗震性能应根据其滞回特性所反映的强度-变形能力的性能下降来进行定量、直接的评价。为了评估腐蚀R/C结构的抗震能力，有必要分析受损构件在开裂、屈服和最终性能阶段的强度变形行为。研究腐蚀对钢筋混凝土受弯剪力梁恢复力的影响。通过电化学加速腐蚀和单调加载试验，建立了基于粘结应力-滑移关系的有限元模型，模拟了粘结强度损失。根据实验数据验证了该模型，并用于预测物理测试中未涵盖腐蚀水平的梁的行为。然后分析了开裂、屈服和极限性能阶段的强度-变形特征。

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引用次数: 0

Coupling mechanism between steel-profile eccentricity and load eccentricity in SRC columns 型钢混凝土柱钢形偏心与荷载偏心的耦合机理

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-28 DOI: 10.1016/j.istruc.2026.111186

Yilai Wu , Alifujiang Xiamuxi , Lingling Qiao , Xiaojin Zhu

In practical engineering applications, Steel Reinforced Concrete (SRC) columns are frequently subjected to the combined effects of load eccentricity and steel-profile eccentricity. However, systematic research on their coupling mechanism remains limited. The coupling effects of load eccentricity and steel-profile eccentricity on the mechanical behavior of SRC columns were investigated using experimental, analytical, and numerical approaches. Eccentric compression tests were conducted with eccentrically configured steel-profile. A numerical model was developed and validated against test data, followed by extensive parametric studies (three heights, nine steel‑profile eccentricities, eight load eccentricities). Results indicate that the influence of steel-profile eccentricity is closely related to load eccentricity ratio; when the load eccentricity ratio is less than 0.38, coincident eccentricities of the load and the steel-profile improve performance, whereas reversed eccentricity reduces the load-bearing capacity as the steel eccentricity increases; when the load eccentricity ratio exceeds 0.38, the steel-profile eccentricity and direction have little influence on the axial load capacity but significantly affect the moment capacity. Based on limit equilibrium theory, design equations are proposed to predict the ultimate load-bearing capacity of eccentrically compressed SRC columns with eccentric steel-profiles, showing good agreement with test results. A practical method is also introduced to pre-estimate the compression and tension failure behaviors without calculating the depth of the compression zone, using a proposed boundary e_ob = 0.54h_o, simplifying the design process and improving engineering efficiency. These findings provide a valuable reference for the design and safety assessment of SRC structures under asymmetric loading or construction conditions.

在实际工程应用中，钢筋混凝土柱经常受到荷载偏心和钢形偏心的共同作用。然而，对二者耦合机理的系统研究仍然有限。采用试验、分析和数值方法研究了荷载偏心和钢型偏心对SRC柱力学性能的耦合影响。用偏心配置的钢型材进行了偏心压缩试验。建立了一个数值模型，并根据试验数据进行了验证，随后进行了广泛的参数研究（三种高度，九种钢型材偏心，八种负载偏心）。结果表明：钢型材偏心的影响与荷载偏心比密切相关；当荷载偏心比小于0.38时，荷载与型钢的重合偏心比提高了性能，相反偏心比随着型钢偏心比的增大而降低了承载能力；当载荷偏心比大于0.38时，钢-型材偏心和方向对轴向承载力影响不大，但对弯矩承载力影响显著。基于极限平衡理论，提出了偏心型钢偏心受压SRC柱的极限承载力预测设计方程，与试验结果吻合较好。采用提出的边界eob = 0.54ho，提出了一种不需要计算压缩区深度就能预估压拉破坏行为的实用方法，简化了设计过程，提高了工程效率。这些研究结果为非对称荷载或施工条件下SRC结构的设计和安全评价提供了有价值的参考。

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引用次数: 0

Fatigue behavior and life prediction of stainless steels after hydrogen charging 不锈钢充氢后疲劳行为及寿命预测

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-28 DOI: 10.1016/j.istruc.2026.111205

Qinglin Wang , Jian Jiang , Jing Dong , Wei Chen , Jihong Ye

The hydrogen storage technology using lined rock cavern (LRC) has gained significant attention due to its high-pressure resistance and good stability. Under cyclic loading in hydrogen environments, stainless steel liners may experience dual fatigue-hydrogen degradation mechanisms, greatly reducing the durability of energy storage structures. Experiments are conducted in this paper to investigate the low-cycle fatigue performance of 304 austenitic, 410 martensitic and 430 ferritic stainless steels after hydrogen charging. The effect of hydrogen charging and strain amplitude on the fatigue life is studied. A coupled simulation model based on ABAQUS and FE-SAFE is established and validated against test results. A cascaded BP-PINN model is established by combining a BP network with a physics-data-driven PINN network to predict fatigue life of hydrogen-charged stainless steels. The experimental results show that hydrogen charging has a significant effect up to 60 % on the fatigue life of stainless steels, and 304 austenitic stainless steels exhibit the highest sensitivity to hydrogen embrittlement. The fatigue life of stainless steels decreases significantly as strain amplitude increases, with a reduction in a range of 30–60 %. Fractographic analyses indicate that the stainless steels exhibit brittle fracture behavior after hydrogen charging, and cracks initiate at surface stress concentration areas while propagation zones exhibit characteristic fatigue striations. The fatigue life of hydrogen-charged stainless steels can be rapidly and accurately predicted by the proposed cascaded PINN model, with errors within 5 %. It provides a theoretical support for optimizing material design and structural safety assessment for energy storage applications.

内衬岩洞储氢技术因其耐高压、稳定性好而受到广泛关注。在氢气环境下的循环载荷作用下，不锈钢衬垫可能会经历双重疲劳-氢气降解机制，大大降低储能结构的耐久性。对304奥氏体、410马氏体和430铁素体不锈钢加氢后的低周疲劳性能进行了试验研究。研究了充氢和应变幅值对疲劳寿命的影响。建立了基于ABAQUS和FE-SAFE的耦合仿真模型，并根据试验结果进行了验证。将BP网络与物理数据驱动的PINN网络相结合，建立了级联BP-PINN模型，用于预测含氢不锈钢的疲劳寿命。实验结果表明，充氢对不锈钢疲劳寿命的影响高达60% %，其中304奥氏体不锈钢对氢脆的敏感性最高。随着应变幅值的增加，不锈钢的疲劳寿命显著降低，降低幅度为30 - 60% %。断口形貌分析表明，充氢后不锈钢呈现脆性断裂行为，裂纹在表面应力集中区萌生，扩展区呈现典型的疲劳条纹。本文提出的级联PINN模型可以快速准确地预测含氢不锈钢的疲劳寿命，误差在5 %以内。为储能应用的材料优化设计和结构安全评价提供理论支持。

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引用次数: 0

RBSM–neural network system for corrosion estimation in RC with multiple rebars considering interaction effects 考虑相互作用的钢筋混凝土多钢筋腐蚀评价的rbsm -神经网络系统

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.istruc.2026.111194

Tianyu Shao , Jie Luo , Kohei Nagai

In reinforced concrete (RC) structures, the rebar corrosion estimation is crucial to evaluate the residual performance and perform maintenance. The authors have developed a system for estimating the corrosion distribution of model with single rebar using surface crack data by integrating the rigid body spring model (RBSM) with machine learning. While this approach demonstrated feasibility, it is limited because real RC members typically contain multiple rebars. In such cases, the cracking distribution is influenced not only by the corrosion pattern but also by interactions between adjacent rebars, which makes direct application of the single-rebar method inadequate. To address this limitation, this study extends the system to multi-rebar cases. A new training dataset is generated through RBSM simulations of RC models with three rebars, and a revised network is developed that incorporates cracking data from neighboring rebars as input. By expanding the input from one-dimensional to two-dimensional crack width data, the system explicitly accounts for rebar interaction effects. The trained model successfully estimates the internal expansive strain along the rebars and reproduces the observed surface crack distribution. Its feasibility is further verified by varying rebar spacing, cover depth, and number of rebars. This research is original in integrating mesoscale RBSM simulations with machine learning to consider rebar interaction. The proposed system not only improves corrosion prediction for realistic RC structures but also provides valuable internal cracking information for durability assessment, including spalling risk.

在钢筋混凝土（RC）结构中，钢筋腐蚀评估是评估其剩余性能和进行维修的关键。作者通过将刚体弹簧模型（RBSM）与机器学习相结合，开发了一种利用表面裂纹数据估计单个钢筋模型腐蚀分布的系统。虽然这种方法被证明是可行的，但由于实际的钢筋混凝土构件通常包含多个钢筋，因此它是有限的。在这种情况下，裂缝分布不仅受到腐蚀模式的影响，还受到相邻钢筋之间相互作用的影响，这使得直接应用单钢筋法是不够的。为了解决这一限制，本研究将系统扩展到多钢筋情况。通过对带有三根钢筋的钢筋混凝土模型进行RBSM仿真，生成了一个新的训练数据集，并开发了一个改进的网络，该网络将相邻钢筋的开裂数据作为输入。通过将输入从一维扩展到二维裂缝宽度数据，该系统明确地考虑了钢筋相互作用的影响。该模型成功地估计了沿钢筋的内部膨胀应变，并再现了观察到的表面裂纹分布。通过改变钢筋间距、覆盖深度和钢筋数量进一步验证了其可行性。本研究独创地将中尺度RBSM模拟与机器学习相结合，以考虑螺纹钢相互作用。该系统不仅提高了现实RC结构的腐蚀预测，而且为耐久性评估提供了有价值的内部裂缝信息，包括剥落风险。

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引用次数: 0

Axial compression behavior of square concrete-filled steel tube columns with stiffeners and multi-spiral stirrups 加筋多螺旋箍筋方钢管混凝土柱轴压性能研究

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.istruc.2026.111198

Baochen Zhu , Xueshuai Li , Dabin Yang

This paper proposes a novel square concrete-filled steel tube (SCFST) column reinforced with stiffeners and multi-spiral stirrups. An experimental and numerical study is conducted to investigate its axial compression behavior. The validity of the finite element model for spiral stirrup reinforced SCFST columns is verified through axial compression tests on SCFST columns with a single spiral stirrup. The failure mechanism and axial compressive behavior are systematically investigated and compared for five types of SCFST columns: without spiral stirrups and stiffeners, without spiral stirrups but with stiffeners, with a single spiral stirrup and stiffeners, with four spiral stirrups and stiffeners, and with five spiral stirrups and stiffeners. The effects of concrete strength grade, spiral stirrup spacing, spiral stirrup diameter, and spiral stirrup strength grade on the axial compressive capacity and ductility of SCFST columns with stiffeners and multi-spiral stirrups are investigated. The results indicate that the stiffeners effectively limit the buckling of the steel tube. The spiral stirrups enhance the confinement effect on the concrete, resulting in a significant improvement in both the compressive capacity and ductility of the SCFST column. Compared to the SCFST column without spiral stirrups and stiffeners, the column with five spiral stirrups and stiffeners exhibited increases of 69.3 % in bearing capacity and 271.2 % in the ductility coefficient, respectively. The formula for predicting the axial compressive capacity of SCFST columns with spiral stirrups and stiffeners is established.

提出了一种新型的加筋多螺旋箍筋方钢管混凝土柱。对其轴压特性进行了试验和数值研究。通过单螺旋箍筋SCFST柱轴压试验，验证了螺旋箍筋加固SCFST柱有限元模型的有效性。对无螺旋箍筋和加筋、无螺旋箍筋但加筋、单螺旋箍筋和加筋、四螺旋箍筋和加筋以及五螺旋箍筋和加筋五种SCFST柱的破坏机制和轴压性能进行了系统的研究和比较。研究了混凝土强度等级、螺旋箍筋间距、螺旋箍筋直径和螺旋箍筋强度等级对加筋和多螺旋箍筋混凝土混凝土柱轴压承载力和延性的影响。结果表明，加筋有效地限制了钢管的屈曲。螺旋箍筋增强了对混凝土的约束作用，显著提高了SCFST柱的抗压能力和延性。与不加螺旋箍筋和加筋的SCFST柱相比，加5根螺旋箍筋和加筋的柱承载力和延性系数分别提高了69.3%和271.2%。建立了螺旋箍筋加加劲混凝土混凝土柱轴压承载力的计算公式。

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引用次数: 0

Interfacial bond performance and degradation mechanisms of UHPC-normal concrete composites in aggressive environments 侵蚀环境下uhpc -普通混凝土复合材料界面粘结性能及降解机理

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.istruc.2026.111152

Kaihua Liu , Junzan Li , Tingrui Wu , Tianyu Xie , Yuan Sang , Youzhu Lin , Jingran He

Interfacial degradation under harsh environmental conditions limits the durability of UHPC-repaired concrete structures. This study provides an experimental-mechanistic framework to evaluate and predict UHPC-normal concrete (NC) interfacial performance. This study investigates the interfacial bond degradation of UHPC-NC composites subjected to seawater dry-wet cycles (DWC) and freeze-thaw cycles (FTC), considering interface treatments and matrix NC strength grades. Results show that grooved interfaces exhibited the highest initial shear strength (4.16 MPa) but experienced severe degradation, with shear strength losses of 41.6 % after 60 DWC and 44.2 % after 75 FTC. Smooth interfaces deteriorated most rapidly, with shear strength decreasing by 72.2 % after only 20 DWC. In contrast, composite-treated interfaces (chiseling + grooving) maintained stable shear and splitting tensile strengths throughout both DWC and FTC, demonstrating superior durability. Higher NC strength effectively enhanced initial interfacial performance and improved strength retention under environmental exposure. Based on experimental results, predictive models for interfacial shear and splitting tensile strength were established, achieving good agreement with test data (R² = 0.84 and 0.83, respectively). The findings confirm that interfacial bond performance is governed by the combined effects of chemical adhesion and mechanical interlock, and that composite interface treatment provides an effective strategy for improving the durability of UHPC–NC composite systems in marine and cold-region environments.

恶劣环境条件下的界面降解限制了uhpc修复混凝土结构的耐久性。本研究为评价和预测UHPC-normal混凝土（NC）界面性能提供了一个实验-机制框架。本研究考察了海水干湿循环（DWC）和冻融循环（FTC）作用下UHPC-NC复合材料的界面粘结降解，考虑了界面处理和基体NC强度等级。结果表明：沟槽界面具有最高的初始抗剪强度（4.16 MPa），但其抗剪强度衰减严重，60 DWC后的抗剪强度损失为41.6 %，75 FTC后的抗剪强度损失为44.2% %；光滑界面恶化最快，仅20 DWC后抗剪强度下降72.2 %。相比之下，复合材料处理的界面（凿凿+开槽）在DWC和FTC中都保持稳定的剪切和劈裂抗拉强度，表现出优异的耐久性。较高的NC强度可以有效地提高初始界面性能，并改善环境暴露下的强度保持。基于实验结果，建立了界面剪切和劈裂抗拉强度预测模型，与试验数据吻合较好（R2分别为0.84和0.83）。研究结果证实，界面结合性能受化学粘附和机械互锁的共同作用，复合界面处理为提高UHPC-NC复合系统在海洋和寒冷地区环境中的耐久性提供了有效的策略。

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引用次数: 0

Analytical shear-slip models of J-hook connectors in steel-concrete-steel sandwich composite structures 钢-混凝土-钢夹层组合结构j型钩连接件剪切-滑移分析模型

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.istruc.2026.111182

Jia-Bao Yan, Huining Guan

Steel-concrete-steel sandwich composite structures (SCSSCSs) with J-hook connectors exhibit superior structural performances under static and dynamic loads. This study developed an analytical shear-slip constitutive model for J-hooks in SCSSCSs. Firstly, a database comprising 119 push-out tests of J-hooks with a loading rate of 0.05 mm/min was established to illustrate their general shear-slip failure modes. The database includes various concrete types with compressive strength ranging from 18.1 to 71 MPa and J-hook yield strength from 280 to 515 MPa. Subsequently, a finite element model (FEM) was developed to reveal the load-transfer mechanism of J-hook connectors. Based on the mechanical insights, a four-stage analytical model was developed with characteristic indexes of elastic stiffness, yielding strength and slip, peak shear resistance and slip, and ultimate slip. Extensive validations against the reported test results confirmed the accuracy of developed shear-slip analytical models. Finally, step-by-step procedure was proposed to establish full-range shear-slip curves of J-hooks. The proposed shear-slip constitutive model can be directly used in numerical simulations with simplified beam or spring elements, improving analysis efficiency without using complex solid elements.

j型钩连接的钢-混凝土-钢夹芯复合结构在静、动荷载作用下均表现出优异的结构性能。本研究建立了scssscs中j型钩的剪切滑移解析本构模型。首先，建立了加载速率为0.05 mm/min的119个j型钩推出试验数据数据库，阐明了j型钩的剪切滑移破坏模式；该数据库包括各种类型的混凝土，抗压强度范围为18.1 ~ 71 MPa， j钩屈服强度范围为280 ~ 515 MPa。建立了j型钩接插件的有限元模型，揭示了j型钩接插件的载荷传递机理。在此基础上，建立了以弹性刚度、屈服强度和屈服滑移、峰值抗剪滑移和极限滑移为特征指标的四阶段分析模型。对报告的试验结果进行了广泛的验证，证实了所开发的剪切滑移分析模型的准确性。最后，提出了逐步建立j型钩全范围剪切滑移曲线的方法。所提出的剪切滑移本构模型可直接用于简化梁单元或弹簧单元的数值模拟，提高了分析效率，而无需使用复杂的实体单元。

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引用次数: 0

Effect and mechanism of composite modification of SAP and PVA fiber on shrinkage characteristics of HPC pavement of steel bridge deck SAP与PVA纤维复合改性对钢桥面HPC铺装收缩特性的影响及机理

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.istruc.2026.111190

Jiaqiang Zhang , Qingpeng Zhang , Huimin Pan , Shengming Dai , Qingxin Zhao , Dongli Wang

Combining High Performance Concrete (HPC) with orthotropic steel bridge decks slabs mitigates fatigue failure and issues such as the susceptibility of bridge deck pavements to damage. But HPC's high shrinkage causes debonding and cracking under the constraint. In this study, the internal curing technology and fiber reinforcement technology were combined. By synergistic incorporation of Super Absorbent Polymer (SAP) and Polyvinyl alcohol (PVA) fiber into the HPC system, the effect of their composite modification on the shrinkage characteristics of the HPC pavement layer applied to the steel bridge deck was investigated. Results show that the combination of SAP and PVA fiber effectively regulates concrete autogenous shrinkage development. The SAP0.5 % + PVA0.4 % scheme provided the best autogenous shrinkage inhibition. When the SAP dosage is between 0.35 % and 0.5 %, and the PVA fiber dosage is between 0.25 % and 0.4 %, the combination of these two can achieve a drying shrinkage inhibition rate of 45–50 %. The water retention effect of SAP and the crack resistance effect of PVA fiber can complement each other and reduce the shrinkage of HPC under restrained conditions. The microscopic analysis shows that SAP particles promote the formation of gel phase through the continuous water release mechanism, homogenize the pore distribution and inhibit the development of the maximum pore size. However, the pores formed by water release from high-dosage SAP will weaken the interfacial bonding between fibers and the matrix, resulting in the weakening of the shrinkage inhibition ability. This research is expected to provide a new material design strategy for solving the cracking problem of orthotropic steel bridge deck slabs.

将高性能混凝土（HPC）与正交各向异性钢桥面板相结合，减轻了疲劳破坏和桥面铺装对损伤的敏感性等问题。但高性能混凝土的高收缩率在约束下会引起脱粘和开裂。本研究将内固化技术与纤维增强技术相结合。通过将高吸水聚合物（SAP）和聚乙烯醇（PVA）纤维协同掺入HPC体系，研究了它们的复合改性对钢桥面HPC铺装层收缩特性的影响。结果表明，SAP纤维与PVA纤维的复合可有效调节混凝土自收缩的发展。SAP0.5 % + PVA0.4 %方案的自收缩抑制效果最好。当SAP掺量在0.35 % ~ 0.5 %之间，PVA纤维掺量在0.25 % ~ 0.4 %之间时，两者组合可达到45 ~ 50 %的干缩抑制率。SAP的保水效果与PVA纤维的抗裂效果相辅相成，在受限条件下降低HPC的收缩率。微观分析表明，SAP颗粒通过连续水释放机制促进凝胶相的形成，使孔隙分布均匀化，抑制最大孔径的发育。然而，高剂量SAP释放水分形成的孔隙会削弱纤维与基体之间的界面结合，导致纤维的防缩能力减弱。该研究有望为解决正交各向异性钢桥面板开裂问题提供一种新的材料设计策略。

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