Structures最新文献_第3页

Damage mechanisms of reinforced concrete shear walls under internal explosions: An analysis based on joint chamfering design 基于节点倒角设计的钢筋混凝土剪力墙内爆破坏机理分析

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.istruc.2026.111179

Hongkun Shang , Weiqi Guo , Youhao Li , Ziqing Wang , Wenqiang Pang , Hongxu Liu

Reinforced concrete (RC) shear wall structures are widely utilized as blast-resistant chambers for storing hazardous chemical materials and high-pressure reaction equipment. They protect surrounding personnel and facilities by confining blast wave propagation and preventing chain reactions. This study investigates the failure mechanisms of full-scale RC shear wall protective structures under internal blast loading, with a specific focus on the influence of chamfer design on the failure modes of wall-slab joints, using both full-scale field tests and numerical simulations. Two RC shear wall structures were constructed with dimensions of 9.7 m × 8 m × 6.95 m and a wall thickness of 0.8 m. Internal detonations of 200 kg TNT were conducted to simulate the extreme loads potentially encountered in blast containment rooms. Based on the experimental and simulation results, the structural damage mechanisms and dynamic responses were analyzed. The results indicate that under internal blast loading, severe damage initiates at the wall-slab joints, primarily manifesting as shear damage. Structures with traditional right-angle joints suffered severe brittle shear failure, resulting in the separation of walls and slabs. In contrast, the chamfer design effectively alleviated stress concentration at the joints, shifting the failure mode from brittle shear to a ductile flexural behavior with superior energy dissipation capabilities. Furthermore, based on the experimental data, validated finite element models were employed to conduct an in-depth parametric analysis, quantifying the effects of reinforcement configuration and TNT charge weight on the structural dynamic response. This research provides new data support and theoretical references for the design and retrofitting of RC blast-resistant structures.

钢筋混凝土剪力墙结构被广泛用作存放危险化学品和高压反应设备的防爆室。它们通过限制冲击波传播和防止连锁反应来保护周围的人员和设施。本研究采用全尺寸现场试验和数值模拟相结合的方法，研究了内爆炸荷载作用下全尺寸RC剪力墙防护结构的破坏机制，重点研究了倒角设计对墙-板节点破坏模式的影响。两座混凝土剪力墙结构尺寸为9.7 m × 8 m × 6.95 m，壁厚为0.8 m。进行了200 kg TNT的内爆，以模拟在防爆室中可能遇到的极端载荷。基于试验和仿真结果，分析了结构的损伤机理和动力响应。结果表明：在内爆破荷载作用下，墙-板结合处产生了严重的损伤，主要表现为剪切损伤；传统直角节点结构脆性剪切破坏严重，导致墙体与楼板分离。相反，倒角设计有效地缓解了接缝处的应力集中，将破坏模式从脆性剪切转变为具有优越耗能能力的延性弯曲行为。在实验数据的基础上，采用经过验证的有限元模型进行了深入的参数分析，量化了配筋构型和TNT装药重量对结构动力响应的影响。该研究为钢筋混凝土抗爆结构的设计和改造提供了新的数据支持和理论参考。

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引用次数: 0

Flexural performance and capacity calculation of a novel prefabricated column-end joint for subway stations 一种新型地铁车站预制柱端节点抗弯性能及承载力计算

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.istruc.2026.111144

Hao Qian , Zhongming Xiong , Zhi Chen , Xuan Chen , Huiyue Zheng

A new prefabricated reinforced concrete (RC) column with a replaceable column-end connection was proposed for subway station structures. The column-end connection incorporates replaceable steel cover plates that can be easily swapped out after an earthquake, minimizing damage to the column. Four 1/4-scale prefabricated column specimens and one cast-in-place column specimen were tested to evaluate the differences in the seismic performance under lateral loading. The results indicate that the tenon-bolted column-end joint was reliable, and all failure modes involved the flexural failure of the steel cover plates. The column with this connection exhibited gradual crack development, high resistance, good ductility, and excellent energy dissipation capacity. Subsequently, a finite element (FE) model was developed to predict the flexural response of the proposed columns. Increasing the axial load ratio, steel cover plate thickness, and bolt number enhanced the stiffness and flexural capacity of the joints, whereas the influence of tenon size was minimal. Additionally, a simplified analytical model for flexural capacity was established based on superposition principles and verified against both experimental and numerical results, with prediction errors generally within 10 %. The findings highlight that the tenon-bolted joint provides rapid assembly, seismic resilience, and ease of post-earthquake repair, making it a promising solution for prefabricated subway station structures in high-seismic regions.

提出了一种具有可更换柱端连接的新型预制钢筋混凝土柱用于地铁车站结构。柱端连接采用可更换的钢盖板，可以在地震后轻松更换，最大限度地减少对柱的损坏。对4个1/4比例预制柱试件和1个现浇柱试件进行了横向荷载作用下的抗震性能试验。结果表明：柱端节点的榫栓连接是可靠的，所有破坏模式都涉及钢盖板的弯曲破坏。采用这种连接方式的柱具有裂缝发育缓慢、抗裂能力强、延性好、耗能能力好等特点。随后，建立了有限元（FE）模型来预测拟议柱的弯曲响应。增加轴向载荷比、钢盖板厚度和螺栓数量均能提高节点的刚度和抗弯能力，而榫尺寸对节点刚度和抗弯能力的影响最小。此外，基于叠加原理建立了简化的抗弯承载力分析模型，并通过实验和数值结果进行了验证，预测误差一般在10 %以内。研究结果强调，榫卯连接提供了快速组装，抗震弹性和震后修复的便利性，使其成为高震区预制地铁车站结构的一个有前途的解决方案。

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引用次数: 0

Exploration of active human–structure interaction during rhythmic jumping 探索在有节奏的跳跃中积极的人与结构的相互作用

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-27 DOI: 10.1016/j.istruc.2026.111154

Phablo Veríssimo I. Dias , Zenón J.G.N. Del Prado

This work presents a mathematical formulation for active human–structure interaction during rhythmic vertical jumping. The structure is represented by a single-degree-of-freedom (SDOF) nonlinear oscillator with cubic stiffness, while the jumper is modeled as a harmonically excited spring-mass-damper (SMD) system whose stiffness varies with the jump frequency. A piecewise-smooth contact dynamics formulation is used to allow the loss of contact between the jumper and the structure. Numerical simulations investigate how variations in propulsion force ratio, damping, and jump frequency influence the response of the coupled system on both non-resonant and resonant structural models. The results show that larger propulsion force values, combined with lower damping ratios, can lead to period-doubling and chaotic motions, whereas higher human damping mitigates these nonlinear effects. With moderate propulsion force levels, the system exhibits responses consistent with experimental results reported in the literature. At lower frequencies, softening bifurcations produce larger displacements for the jumper, while higher frequencies suggest new jumping strategies. When a resonant structural model is considered, the system exhibits sub-harmonic, high-order and chaotic responses driven by the interaction between piecewise leg stiffness and the structures’s cubic non-linearity. These regimes delineate frequency and propulsion force bands that, once further calibrated, can inform preliminary assessments of lightweight floors susceptible to human-induced vibrations.

这项工作提出了在有节奏的垂直跳跃过程中积极的人-结构相互作用的数学公式。该结构由具有三次刚度的单自由度非线性振子来表示，跳线为刚度随跳线频率变化的谐波激励弹簧-质量-阻尼器（SMD）系统。采用分段平滑接触动力学公式，允许跳线与结构之间失去接触。数值模拟研究了推进力比、阻尼和跳跃频率的变化如何影响耦合系统在非谐振和谐振结构模型上的响应。结果表明，较大的推进力值和较低的阻尼比会导致周期加倍和混沌运动，而较高的人为阻尼会减轻这些非线性影响。在中等推进力水平下，系统表现出与文献中报道的实验结果一致的响应。在较低的频率下，软化分岔产生较大的跳线位移，而较高的频率则表明新的跳线策略。当考虑谐振结构模型时，系统在分段腿刚度和结构的三次非线性之间的相互作用下表现出亚谐波、高阶和混沌响应。这些机制描述了频率和推进力带，一旦进一步校准，就可以为易受人为振动影响的轻质地板提供初步评估。

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引用次数: 0

Durability analysis of concrete mixes with raw-crushed wind-turbine blade and recycled concrete aggregate: A modeling approach 风力涡轮机叶片与再生混凝土骨料混合混凝土耐久性分析：建模方法

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-26 DOI: 10.1016/j.istruc.2026.111199

Nerea Hurtado-Alonso , Javier Manso-Morato , Víctor Revilla-Cuesta , Marta Skaf

Residues from the wind energy sector represent a potential source of raw materials for incorporation into concrete. Specifically, Recycled Concrete Aggregate (RCA) and Raw-Crushed Wind-Turbine Blade (RCWTB) have shown promise in improving the environmental eco-efficiency of concrete, without compromising its mechanical performance. This study focuses on the durability properties of concrete mixes incorporating RCA at levels ranging from 0 % to 100 %, and between 0 % and 10 % of RCWTB. The properties evaluated included porosity, Water Absorption (WA) rate, and abrasion resistance. A modeling approach through Response Surface Method (RSM) was employed to optimize the mix design based on these durability parameters. The results indicated that the inclusion of both RCA and RCWTB overall increased porosity and WA rate, although the glass fiber-reinforced polymer fibers in RCWTB partly mitigated this effect, probably acting as barriers to water penetration. Thus, the presence of these fibers also improved abrasion resistance values when added in intermediate contents. Optimal combinations of up to around 5 % RCWTB and about 10 % RCA were identified following numerical and graphical RSM optimization aimed at minimizing all durability indicators simultaneously. Finally, global numerical optimization, considering mechanical, durability, and eco-efficiency criteria, and following normalization of all concrete properties, identified an optimal mixture containing 3.1 % RCWTB and 46.7 % RCA, in which higher waste contents were yielded, as durability performance accounted for only one-third of the optimization weight. Overall, sustainable concrete containing from low to medium contents of wind-industry-derived residual materials can be developed, yielding a balanced mechanical, durability, and environmental performance.

风能部门的残留物代表了混凝土原料的潜在来源。具体来说，再生混凝土骨料（RCA）和原碎风力涡轮机叶片（RCWTB）在不影响混凝土力学性能的情况下，在提高混凝土的环境生态效率方面表现出了希望。本研究的重点是混凝土混合物的耐久性性能，掺入RCA的水平范围为0 %至100 %，以及0 %至10 %的RCWTB。评估的性能包括孔隙率、吸水率和耐磨性。基于这些耐久性参数，采用响应面法（RSM）建模方法对配合比进行优化设计。结果表明，RCA和RCWTB的加入总体上增加了孔隙率和WA率，尽管RCWTB中的玻璃纤维增强聚合物纤维在一定程度上减轻了这种影响，可能起到了水渗透的屏障作用。因此，当添加中间含量时，这些纤维的存在也提高了耐磨性值。通过数值和图形RSM优化，确定了高达5% % RCWTB和10% % RCA的最佳组合，旨在同时最小化所有耐久性指标。最后，考虑到机械、耐久性和生态效率标准，并对所有混凝土性能进行归一化后，进行了全局数值优化，确定了含有3.1 % RCWTB和46.7 % RCA的最佳混合物，其中产生了更高的废物含量，因为耐久性性能仅占优化重量的三分之一。总的来说，可持续混凝土包含从低到中等含量的风力工业衍生的残余材料，可以产生平衡的机械，耐用性和环境性能。

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引用次数: 0

Seismic fragility and vulnerability assessment of skew-curved box-girder bridges subjected to near- and far-fault earthquakes using dual intensity measures 斜曲箱梁桥近、远断层地震易损性及双烈度评价

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-26 DOI: 10.1016/j.istruc.2026.111142

Fatemeh Asen , Hossein Pahlavan , Mohammad Shamekhi Amiri , Ali Naseri

This study investigates the seismic vulnerability of skew-curved concrete box-girder bridges subjected to both near-fault and far-fault earthquakes. Nonlinear time-history analyses were conducted to develop component-level fragility curves and system-level fragility surfaces for skew angles of 15° and 45°. System fragility was characterized using dual intensity measures, PGA and SA(T1), allowing a more robust representation of seismic demand. The component medians demonstrated that columns and deck unseating had the lowest median values (around 0.3–0.5 g), indicating their dominant contribution to system failure. A Vulnerability Index (VI)-based framework was employed to quantify overall bridge damage potential. The results indicated that near-fault ground motions significantly amplify bridge vulnerability, with VI values approximately 10–15 % higher than those under far-fault excitations. Moreover, increasing the skew angle also heightened vulnerability by up to 10 %, primarily through amplified torsional demands and deck unseating risks. The VI values indicated a rapid transition from slight to complete damage as PGA and SA(T1) approached 1.0 g, with the probability of complete failure surpassing 80 % at these intensities. The proposed VI-based framework effectively integrates probabilistic damage data and provides a reliable basis for comparing the seismic resilience of bridge systems affected by different fault conditions.

本文研究了斜弯混凝土箱梁桥在近断层和远断层地震作用下的地震易损性。通过非线性时程分析，建立了倾角为15°和45°的构件级易损性曲线和系统级易损性曲面。系统脆弱性采用双强度指标PGA和SA（T1）来表征，从而更可靠地表示地震需求。分量中值表明，柱和甲板脱座的中值最低（约0.3-0.5 g），表明它们对系统故障的主要贡献。采用基于脆弱性指数（VI）的框架对桥梁整体损伤潜力进行量化。结果表明，近断层地震动显著放大了桥梁的脆弱性，其VI值比远断层地震动高约10-15 %。此外，增加倾斜角度也会增加高达10% %的脆弱性，主要是通过增加扭转需求和甲板脱落风险。当PGA和SA（T1）接近1.0 g时，VI值表明从轻微到完全损伤的快速转变，在这些强度下完全失效的概率超过80% %。所提出的基于vi的框架有效地整合了概率损伤数据，为比较不同故障条件下桥梁体系的抗震恢复能力提供了可靠的依据。

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引用次数: 0

Lateral impact performance of CFDST members after fire exposure CFDST构件火灾暴露后的横向冲击性能

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-26 DOI: 10.1016/j.istruc.2026.111140

Wei Li, Cong-Ying Chen, Ying-Zhuo Gu

This study examines the post-fire impact behaviour of CFDST members through combined experimental and numerical methods. Tests on 15 CFDST and 13 concrete-filled steel tubular (CFST) counterparts showed that the inner steel tube in CFDST significantly reduced concrete damage. Fire exposure substantially degraded impact resistance, with 60 min of fire leading to a 34.5 % reduction in impact force and a 47.0 % increase in mid-span deflection compared to unexposed ones. A finite element model incorporating temperature-dependent material degradation, confinement effect, strain rate sensitivity and contact behaviour was developed and validated. The analysis clarified failure mechanisms, stress distribution and energy dissipation mechanisms under impact. The effect of the dominant factor such as fire duration was analysed. The combined effect of axial compression and fire exposure was limited, with variations within 5 %, confirming material degradation as the primary cause of performance loss.

本研究通过实验与数值相结合的方法研究了CFDST构件的火灾后冲击行为。对15个CFDST和13个钢管混凝土（CFST）的试验表明，CFDST中的内钢管显著降低了混凝土的损伤。暴露在火中大大降低了抗冲击性，与未暴露的相比，60 min的火导致冲击力降低34.5% %，跨中挠度增加47.0% %。建立并验证了包含温度相关材料降解、约束效应、应变率敏感性和接触行为的有限元模型。分析明确了冲击作用下的破坏机制、应力分布和能量耗散机制。分析了火灾持续时间等主导因素的影响。轴向压缩和火灾暴露的综合影响是有限的，变化在5 %以内，证实材料退化是性能损失的主要原因。

引用次数: 0

Experimental and vibration control analysis of node-type sector-shaped composite viscoelastic dampers 节点型扇形复合粘弹性阻尼器试验及振动控制分析

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-24 DOI: 10.1016/j.istruc.2026.111175

Jiang-liang Song , Zhi-qi Mu , Pei-zhen Li , Yong-mei Qian , Run-jie Liu , Ji-hong Guo , Dong-yang Wang

As architectural forms continue to evolve, traditional node-type dampers may no longer sufficiently meet diverse application demands. To improve the seismic performance of beam-column joints in frame structures, this study proposes a resilient node-type sector-shaped composite viscoelastic damper (SCVD) specifically designed for such connections. The mechanical properties of the SCVD are investigated through quasi-static tests, and the results demonstrate excellent energy dissipation capacity, as evidenced by fully developed hysteretic curves. The SCVD’s mechanical behavior is well characterized by a bilinear model, with calculated stiffness values showing strong agreement with experimental data. Based on both experimental and theoretical analyses, a time-history analysis is performed to evaluate the SCVD’s energy dissipation capability and seismic mitigation effectiveness under rare earthquake scenarios, using a high-rise partially encased composite (PEC) steel-concrete frame as a case study. The results indicate that the SCVD significantly enhances the seismic resilience of high-rise frame structures while effectively suppressing the development of plastic damage.

随着架构形式的不断发展，传统的节点型阻尼器可能不再能够充分满足各种应用需求。为了提高框架结构中梁柱节点的抗震性能，本研究提出了一种专门针对此类节点设计的弹性节点型扇形复合粘弹性阻尼器（SCVD）。通过准静态试验研究了SCVD的力学性能，结果表明其具有良好的能量耗散能力，滞回曲线完全发育。双线性模型很好地表征了SCVD的力学行为，计算出的刚度值与实验数据吻合较好。在实验和理论分析的基础上，以高层部分封闭组合钢-混凝土框架为例，对SCVD在罕见地震情景下的耗能能力和抗震效果进行了时程分析。结果表明，SCVD在有效抑制塑性损伤发展的同时，显著提高了高层框架结构的抗震回弹能力。

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引用次数: 0

Development of novel scaling methodology for experimental test of blast-loaded masonry structures 爆破砌体结构试验试验中新型标度方法的发展

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-24 DOI: 10.1016/j.istruc.2026.111174

Pengli Cong , Guangcai Zhang

Full-scale blast test of masonry structures is challenging due to the spatial constraints of laboratory and high costs. Therefore, developing and applying scaling laws to produce scaled structural models that can accurately predict both the global and local response of prototypes is essential. However, the strain-rate effect significantly influences the strength of brick and mortar, potentially introducing substantial differences between the dynamic responses of a scaled model and its prototype. Given the complexity of constituent materials and distinct dynamic response mechanisms, this study proposes scaling laws for global and local responses of blast-loaded masonry structures using dimensional analysis. For global collapse of masonry walls, we develop a novel scaling methodology that concurrently accounts for gravity effects and strain-rate effects. Regarding local response of masonry walls, the scaling laws taking into account strain-rate effects of material are suggested. To validate the proposed methodology, numerical models of full-scale and reduced-scale masonry walls subjected to blast loading are established via the detailed micro-modelling techniques. Additionally, we investigate practical distortions in bed joint thickness and quantify the influence of neglecting gravity effects on scaling accuracy. The proposed scaling methods provide a scientific foundation for designing blast-resistant masonry model tests.

由于实验室空间和成本的限制，砌体结构的全尺寸爆破试验具有挑战性。因此，开发和应用标度定律来生成能够准确预测原型整体和局部响应的标度结构模型是至关重要的。然而，应变率效应显著影响砖和砂浆的强度，可能导致比例模型和原型之间的动态响应存在实质性差异。考虑到组成材料的复杂性和不同的动力响应机制，本研究采用量纲分析方法提出了爆破砌体结构整体和局部响应的标度规律。对于砖石墙的整体倒塌，我们开发了一种新的标度方法，同时考虑重力效应和应变率效应。针对砌体墙体的局部响应，提出了考虑材料应变率效应的标度规律。为了验证所提出的方法，通过详细的微观建模技术建立了受爆炸载荷影响的全尺寸和缩小尺寸砌体墙的数值模型。此外，我们还研究了床节点厚度的实际变形，并量化了忽略重力效应对标度精度的影响。所提出的标度方法为砌体抗爆模型试验设计提供了科学依据。

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引用次数: 0

Reliability-based design of concrete-filled stainless-steel tubular columns using machine learning 基于可靠性的不锈钢钢管混凝土柱的机器学习设计

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-24 DOI: 10.1016/j.istruc.2026.111193

Mohammad F. Tamimi , Mohamed Soliman , Somayeh Shojaeikhah , Mu'ath I. Abu Qamar , Ammar A. Alshannaq

This paper investigates the axial compressive behavior and reliability of concrete-filled stainless-steel tubular (CFSST) columns by integrating advanced machine learning (ML) techniques with probabilistic reliability analyses. A comprehensive database consisting of 422 experimental tests on circular and rectangular CFSST columns was used to develop and rigorously evaluate six ML algorithms: Gaussian Process Regression (GPR), Artificial Neural Networks (ANN), Random Forest (RF), Decision Tree (DT), Support Vector Regression (SVR), and K-Nearest Neighbors (k-NN). Among these models, the GPR demonstrated superior accuracy and robustness, effectively capturing the nonlinear response and strain-hardening characteristics of stainless steel. Utilizing this optimal ML model, an extensive reliability analysis was conducted via Monte Carlo simulations to quantify the reliability index (β) for various resistance factors

(ϕ)

specified by AISC 360–16 and partial safety factors (

γ_{M}

) outlined in Eurocode 4 (EC4). The analysis highlighted substantial conservatism inherent in existing design guidelines, especially pronounced for circular sections, with AISC and EC4 predictions yielding approximately 75 % and 85 % of the experimentally measured capacities, respectively. A Sobol sensitivity analysis further revealed that geometric parameters, particularly wall thickness and cross-sectional dimensions, dominated the variability in column capacity far more significantly than uncertainties in material properties. Based on a target reliability index

(β_{t} \approx 3.0)

, the reliability analysis recommended resistance factors

(ϕ)

in the range of 0.80–0.85 for AISC 360–16 and partial safety factors

(γ_{M})

between 1.15–1.25 for EC4 based on the geometry of the column. These recalibrated factors, explicitly accounting for stainless steel characteristics, provide improved reliability and optimized design provisions for structural engineers.

本文通过将先进的机器学习（ML）技术与概率可靠性分析相结合，研究了不锈钢钢管混凝土（CFSST）柱的轴压性能和可靠性。利用由422个圆形和矩形CFSST列实验测试组成的综合数据库，开发并严格评估了六种ML算法：高斯过程回归（GPR）、人工神经网络（ANN）、随机森林（RF）、决策树（DT）、支持向量回归（SVR）和k-近邻（k-NN）。其中，GPR模型具有较好的精度和鲁棒性，能够有效地捕捉不锈钢的非线性响应和应变硬化特性。利用该最优ML模型，通过蒙特卡罗模拟进行了广泛的可靠性分析，以量化AISC 360-16指定的各种阻力因子（ϕ）和部分安全因子（γM）的可靠性指数（β）欧洲代码4 （EC4）概述。分析强调了现有设计指南固有的实质性保守性，特别是对于圆形截面，AISC和EC4预测分别产生大约75%和85%的实验测量能力。Sobol敏感性分析进一步表明，几何参数，特别是壁厚和截面尺寸，比材料性能的不确定性更显著地主导了柱容量的变化。基于目标可靠性指标（βt≈3.0），可靠性分析建议AISC 360-16的阻力系数（φ）在0.80-0.85范围内，EC4的部分安全系数（γM）在1.15-1.25之间，基于柱的几何形状。这些重新校准的因素，明确地考虑了不锈钢的特性，为结构工程师提供了更高的可靠性和优化的设计条款。

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引用次数: 0

Shear behavior of joints with embedded steel plates in innovative castellated keys 创新槽形键中预埋钢板节点的剪切性能

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures

Pub Date : 2026-01-24 DOI: 10.1016/j.istruc.2026.111184

Kaidi Zhang , Junfeng Jia , Dahai Yang , Kai Yang , Yonghu Huang , Jianxun Zhang

As the weakest part of precast segmental structures, the joint between adjacent segments has a non-negligible impact on the shear performance of structures. However, existing joint configurations are limited in enhancing shear capacity and construction efficiency. To overcome these limitations, an innovative key with embedded steel plates was developed. A total of fifteen castellated key joints were designed, including two conventional epoxy joints, ten epoxy joints and two dry joints with innovative keys. The influence of joint structure, joint type (dry or epoxy), bonding measure between steel plates and concrete, steel ratio, yield strength and height-to-thickness ratio of steel plates on the shear behavior of novel epoxy joints was studied experimentally and numerically. The results indicated that the innovative joint exhibited a concrete spalling failure, which was distinct from that of conventional joints. Owing to the contribution of the embedded steel plates, the innovative epoxy joints achieved significantly enhanced shear performance. The shear strength of the innovative epoxy joint increased with increasing steel ratio and was 10.2 %-25.5 % higher than that of the conventional epoxy joint, and 13.5 % higher than that of the dry joint. The shear stiffness of innovative joints was 27.4 %-45.9 % greater than that of conventional joints. Improved bonding between the male parts and the embedded steel plates resulted in a higher failure shear load. When the design yield strength is lower than 332 MPa and the height-to-thickness ratio of embedded steel plates exceeded 25, yielding of steel plates in the castellated key occurred, thereby enhancing the shear strength of the joints. The shear strength of the innovative joints was mainly contributed by steel plates and concrete, and the proposed prediction formulas demonstrated good agreement with both the experimental and numerical results.

相邻节段连接作为预制节段结构最薄弱的部分，对结构的抗剪性能有着不可忽视的影响。但现有节理结构在提高抗剪能力和施工效率方面存在一定局限性。为了克服这些限制，开发了一种具有嵌入式钢板的创新钥匙。共设计了15个空心键接头，包括2个常规环氧键接头、10个环氧键接头和2个创新键干接头。研究了接缝结构、接缝类型（干缝或环氧缝）、钢板与混凝土的粘结方式、配钢比、屈服强度和钢板高厚比等因素对新型环氧接缝抗剪性能的影响。结果表明：该新型节理具有明显的混凝土剥落破坏特征，与传统节理不同；由于预埋钢板的作用，新型环氧接缝的抗剪性能得到了显著提高。新型环氧接缝的抗剪强度随着钢比的增大而增大，比常规环氧接缝的抗剪强度提高10. % ~ 25.5 %，比干缝的抗剪强度提高13.5 %。创新节理的抗剪刚度比传统节理提高27.4 % ~ 45.9 %。外延件与预埋钢板的粘结性得到改善，破坏剪切载荷增大。当设计屈服强度低于332 MPa，预埋钢板高厚比超过25时，出现了筒形键内钢板的屈服，从而提高了节点的抗剪强度。创新节点的抗剪强度主要由钢板和混凝土贡献，所提出的预测公式与试验和数值结果吻合较好。

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