Journal of Constructional Steel Research最新文献_第2页

Ductile crack initiation in welded connections with highly dissipative panel zones 高耗散板区焊接连接的延性裂纹萌生

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-10 DOI: 10.1016/j.jcsr.2026.110258

Andronikos Skiadopoulos , Dimitrios G. Lignos

Shear yielding enables beam-to-column connections in capacity-designed steel moment frames to dissipate energy and remain stable at lateral drifts up to 4% rad, as long as ductile fracture does not compromise their hysteretic behavior at lower drift levels. This paper characterizes the fracture potential of welded unreinforced flange-welded web (WUF-W) connections designed with such an alternative design concept that defies the current status quo of pre-qualified welded connections. The analysis relies on state-of-the-art micromechanics based fracture models along with detailed mechanical testing and scanning electron microscopy of samples extracted from WUF-W connections exhibiting ductile fracture originating at the kink points of their panel zone at deformation demands characteristic of earthquakes with a low probability of occurrence. The analysis results demonstrate that while the origin of ductile fracture is near the complete joint penetration (CJP) weld toe of the beam flange-to-column face joint, the overall hysteretic behavior of the connections meet the pre-qualification limits established in current seismic standards. Leaving a customized beveled backing bar in place after completing the CJP welds does not elevate the risk of ductile fracture at this location, thus enabling a more straightforward fabrication process than the current practice. The simulation of hypothetical extreme earthquake loading scenarios demonstrates that, the examined WUF-W connections are not prone to ductile fracture till at least 6% rad while achieving instability-free hysteretic response.

只要韧性断裂在较低的漂移水平下不影响其滞回性能，在承载力设计的钢弯矩框架中，梁柱连接的剪切屈服使其在高达4% rad的横向漂移中耗散能量并保持稳定。本文描述了采用这种替代设计理念设计的焊接无增强法兰焊接腹板（WUF-W）连接的断裂潜力，这种设计理念挑战了目前预合格焊接连接的现状。该分析依赖于最先进的基于微观力学的断裂模型，以及从WUF-W连接中提取的样品的详细力学测试和扫描电子显微镜，显示出在低概率地震发生的变形要求下，面板区域的扭结点产生的韧性断裂。分析结果表明，当延性断裂发生在梁-翼-柱面节点的完全贯通焊缝趾附近时，节点的整体滞回性能满足现行抗震标准的预认证限制。在完成CJP焊接后，将定制的斜面支撑条留在原位，不会增加该位置的韧性断裂风险，因此比目前的做法更直接地实现了制造过程。假设极端地震荷载情景的模拟表明，在所研究的WUF-W连接在达到无失稳迟滞响应的情况下，至少在6% rad之前不容易发生韧性断裂。

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引用次数: 0

Shear behaviour of an innovative module-to-module connection for high-rise steel modular buildings 高层钢模块建筑创新模块对模块连接的剪切性能

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-07 DOI: 10.1016/j.jcsr.2026.110277

Yan Duan , Tianyao Ping , Ben Young , Wei Pan

This study aimed to develop an innovative module-to-module (M2M) connection for high-rise steel modular buildings and examine its structural behaviour under shear loads. The M2M connection was developed based on the examination of the special characteristics of connections in high-rise steel modular buildings from the perspectives of construction efficiency and structural safety. Experimental tests with eight specimens were performed to investigate the shear behaviour of the developed connection. Numerical models were then established and validated base on the test results to accurately simulate the shear behaviour of the developed connection. Subsequent parametric numerical simulations with 153 models were performed to examine the effects of critical influencing factors on the shear behaviour of the connection. The analysis results indicated that the middle sleeve in the developed M2M connection can provide effective protection for the vertical connectors from horizontal loads. Furthermore, the identified critical influencing factors, such as the steel grade of different components and axial compression ratio, can facilitate the protection of the vertical connector across all loading stages, thereby ensuring the disassembly and reassembly ability of the developed connection. The axial compression ratio had the most significant effects on the shear behaviour of the connection, as it not only increased the yield and ultimate load of the connection by over 100%, but also exhibited significant interactive effects with the thickness of the connection plate and the steel grade of the middle sleeve and the connection plate.

本研究旨在为高层钢模块建筑开发一种创新的模块对模块（M2M）连接方式，并研究其在剪切荷载下的结构性能。M2M连接是从施工效率和结构安全的角度对高层钢模块建筑中连接的特殊性进行考察的基础上发展起来的。进行了8个试件的试验试验，以研究开发的连接的剪切性能。然后根据试验结果建立并验证了数值模型，以准确模拟开发连接的剪切行为。随后进行了153个模型的参数化数值模拟，以检验关键影响因素对连接剪切性能的影响。分析结果表明，所开发的M2M连接中套筒可以有效地保护垂直连接件免受水平荷载的影响。此外，通过对不同构件的钢种、轴压比等关键影响因素的识别，可以在各个加载阶段对垂直连接件进行保护，从而保证所开发连接件的拆装能力。轴压比对连接接头抗剪性能的影响最为显著，不仅使连接接头的屈服和极限荷载提高了100%以上，而且与连接板厚度、中间套和连接板的钢种之间存在显著的交互作用。

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引用次数: 0

Cut-out joint for steel truss suspension bridges: Constructability analysis and stiffness testing 钢桁架悬索桥切割接头：可施工性分析及刚度试验

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-07 DOI: 10.1016/j.jcsr.2026.110287

Zhenbei Liu , Taike Zhang , Bing Cui , Gaoyan Cui , Jingyu Lu , Yongjian Liu , Kun Wang , Chongyang Jia

To address the segment division requirement of steel truss stiffening girders for long-span suspension bridges, the vertical cut-out joint was introduced. In this scheme, the integral joint was vertically divided, so the cut-out joint was created by connecting two semi-integral joints via high-performance connection systems. Two finite element models of suspension bridge were employed to analyze the hoisting process of girders. Meanwhile, the full-scale model tests were conducted to verify the construction feasibility, the rotational performance of joints, and the accuracy of two finite element models. The results demonstrate that the segment division by vertical cutting produces symmetric segments with uniform mass distribution and superior hoisting stability. This approach eliminates the need for splicing of diagonal members, thus simplifying construction. Full-scale tests reveal a 30% enhancement in the out-of-plane rotational stiffness of the cut-out joint compared to the integral joint. The splice plates of cut-out joint improve the bearing efficiency of the diagonal and reduce the risk of out-of-plane buckling in gusset. These findings confirm that the cut-out joint not only enhances structural performance but also significantly improves construction efficiency. This study provides a novel and practical design solution for segment division of long-span steel truss suspension bridges.

针对大跨度悬索桥钢桁架加劲梁的节段划分要求，引入了垂直切缝。在该方案中，整体接头被垂直划分，因此通过高性能连接系统将两个半整体接头连接在一起形成切割接头。采用两种悬索桥有限元模型，对吊桥梁的吊装过程进行了分析。同时，进行了全尺寸模型试验，验证了两种有限元模型的构建可行性、节点转动性能和精度。结果表明：采用垂直切割分段法可得到质量分布均匀的对称分段，提升稳定性好；这种方法消除了对角构件拼接的需要，从而简化了构造。全尺寸测试表明，与整体关节相比，切割关节的面外旋转刚度提高了30%。切割接头的拼接板提高了对角线的承载效率，降低了扣板的面外屈曲风险。研究结果表明，节理不仅提高了结构性能，而且显著提高了施工效率。本研究为大跨度钢桁架悬索桥的分段设计提供了一种新颖实用的解决方案。

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引用次数: 0

Seismic performance of high-strength circular CFST column-to-composite beam joint using external diaphragm 采用外隔膜的高强度圆形钢管混凝土柱-组合梁节点的抗震性能

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-06 DOI: 10.1016/j.jcsr.2026.110267

Wei Li, Hao Guan

This study conducts experimental and numerical investigations on the seismic behaviour of high-strength circular CFST column-to-composite beam joint using external diaphragm. Both high-strength steel and high-strength concrete were used, where the yield strength of steel tube was 620.6 MPa and 771.7 MPa, and the cube compressive strength of core concrete was 78.5 MPa. The same profile of circular steel tubes (Φ 203 mm × 4 mm) and the size of external diaphragms (60 mm × 8 mm) were applied for all specimens. Columns were subjected to constant axial load ratios of 0.23 and 0.38, while beams were subjected to reverse cyclic loading. The experimental parameters were the steel tube strength, the axial load ratio of the CFST column and the beam cross-sectional configuration. A finite element model was established and validated, accounting for material nonlinearity and damage, confinement effect and inter-component interactions. Parametric studies were conducted to explore the effects of various critical parameters. The hysteretic model for the shear strength-shear deformation relation of panel zone was analysed. By increasing the steel tube yield strength from 620.6 MPa to 771.7 MPa, the average maximum shear of the panel zone was enhanced by 13.0%, and the dissipated energy increased by 26.7%. The panel zone shear model for joints using normal-strength materials remained applicable for those using high-strength materials.

本文对采用外隔板的高强度圆形钢管混凝土柱-组合梁节点的抗震性能进行了试验和数值研究。采用高强钢和高强混凝土，其中钢管屈服强度为620.6 MPa和771.7 MPa，核心混凝土立方体抗压强度为78.5 MPa。所有试件均采用相同的圆钢管外形（Φ 203 mm × 4 mm）和外隔板尺寸（60 mm × 8 mm）。柱承受恒定轴向荷载比为0.23和0.38，而梁承受反向循环荷载。试验参数为钢管强度、钢管混凝土柱轴向载荷比和梁截面构型。建立并验证了考虑材料非线性与损伤、约束效应和构件间相互作用的有限元模型。进行了参数研究，以探讨各种关键参数的影响。分析了板区抗剪强度-剪切变形关系的滞回模型。将钢管屈服强度由620.6 MPa提高到771.7 MPa，板区平均最大剪切强度提高13.0%，耗散能提高26.7%。采用普通强度材料的节点面板区域剪切模型仍然适用于采用高强度材料的节点。

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引用次数: 0

Fire testing on axially compressed stainless-clad bimetallic steel columns with restraints 带约束的轴向压缩不锈钢包层双金属钢柱的防火试验

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-06 DOI: 10.1016/j.jcsr.2026.110280

Yiwen Wu , Yueshen Fan , Ziwei Zhao , Tong Xiao

Stainless-clad bimetallic steel (SCBS) retains the superior mechanical properties of high-performance alloys while significantly reducing the consumption of alloying elements. Based on SCBS (304 + Q235), this study investigates the fire resistance of restrained SCBS columns under axial compression through systematic experimental work. A total of 18 tensile tests were conducted to evaluate the mechanical properties of SCBS covering the temperature range from 20 to 800 °C. Steady-state tests reveal that the stress–strain curve exhibits a clear elastic region and yield plateau at room temperature, whereas pronounced nonlinearity is observed at high temperatures. The two-stage and three-stage constitutive models proposed for SCBS (316 L + Q355B) provide good agreement with the tested stress–strain curves. Furthermore, this study presents the first fire tests on five restrained SCBS columns under axial compression, focusing on the effects of load ratio, axial restraint stiffness ratio and slenderness ratio. The experiments reveal the failure modes of the specimens and provide detailed records of furnace temperature, surface temperature, axial displacement and mid-span lateral displacement over time, as well as the critical buckling and failure temperatures of the columns. This work offers critical scientific support for the broader application of SCBS in structural engineering and the development of relevant design codes.

不锈钢包层双金属钢（SCBS）在保持高性能合金优越的机械性能的同时，显著减少了合金元素的消耗。本文以SCBS （304 + Q235）为基础，通过系统的试验研究了约束SCBS柱在轴压作用下的耐火性能。共进行了18次拉伸试验，以评估SCBS在20至800°C温度范围内的力学性能。稳态试验表明，在室温下，应力-应变曲线呈现出明显的弹性区和屈服平台，而在高温下，应力-应变曲线呈现出明显的非线性。提出的两阶段和三阶段SCBS （316l + Q355B）本构模型与试验的应力-应变曲线吻合较好。在此基础上，对5根受约束的SCBS柱进行了首次轴压防火试验，重点研究了载荷比、轴向约束刚度比和长细比的影响。试验揭示了试件的破坏模式，详细记录了炉温、表面温度、轴向位移和跨中侧向位移随时间的变化，以及柱的临界屈曲温度和破坏温度。这项工作为SCBS在结构工程中的广泛应用和相关设计规范的制定提供了重要的科学支持。

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引用次数: 0

Lateral performance of plywood-sheathed cold-formed steel shear wall: Experimental and numerical investigations 胶合板冷弯型钢剪力墙的横向性能：实验和数值研究

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-05 DOI: 10.1016/j.jcsr.2026.110279

Xiaofeng Sun , Zhaozhuo Gan , Lie Luo , Zhiyang Cheng

Plywood, as an engineered wood product, offers excellent mechanical properties and cost-effectiveness, making it a promising sheathing candidate for cold-formed steel (CFS) shear walls. However, limited research has hindered its application compared to other sheathing materials. This paper presents a comprehensive experimental and numerical investigation into the lateral performance of plywood-sheathed CFS shear walls. Fifteen full-scale specimens were tested to evaluate the effects of sheathing thickness, perimeter screw spacing, screw diameter, and loading protocol. For a configuration with 2.44 × 2.44 m size, 12 mm sheathing, 4.8 mm screws, and 150 mm perimeter screw spacing, the wall exhibited an elastic stiffness of 1.47 kN/mm and a shear strength of 16.1 kN/m. Results indicate that shear performance is governed by connection behavior. Densifying perimeter screws to 50 mm significantly enhanced shear capacity but may lead to a reduction in ductility if the framing is not concurrently strengthened. A detailed finite element model was developed and verified against the experimental data. A subsequent parametric study investigated the effects of stud spacing, stud section size, field screw spacing, and wall aspect ratio on wall performance. Results indicated that increasing stud spacing reduces shear capacity, whereas stud section size has negligible impact on ultimate strength under proper overstrength design, and shear strength per unit length remained relatively constant for aspect ratios up to 2:1.

胶合板作为一种工程木制品，具有优异的机械性能和成本效益，是冷弯型钢（CFS）剪力墙的理想护套材料。然而，与其他护套材料相比，有限的研究阻碍了其应用。本文对复合材料CFS剪力墙的横向性能进行了全面的试验和数值研究。15个全尺寸试件进行了测试，以评估护套厚度、周长螺钉间距、螺钉直径和加载方案的影响。在2.44 × 2.44 m尺寸、12 mm护套、4.8 mm螺钉、150mm周长螺钉间距配置下，墙体弹性刚度为1.47 kN/mm，抗剪强度为16.1 kN/m。结果表明，抗剪性能受连接行为的支配。将周边螺钉致密化至50mm可显著提高抗剪能力，但如果框架没有同时加强，则可能导致延性降低。建立了详细的有限元模型，并根据实验数据进行了验证。随后的参数研究考察了螺柱间距、螺柱截面尺寸、螺杆间距和管壁长径比对管壁性能的影响。结果表明，增加螺柱间距会降低抗剪能力，而在适当的超强设计下，螺柱截面尺寸对极限强度的影响可以忽略不计，当长径比达到2:1时，单位长度抗剪强度保持相对恒定。

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引用次数: 0

Controlled Inelastic Response of BRS Energy Dissipation System in Self-Centering CFST Bridge Columns 自定心CFST桥柱中BRS耗能系统的可控非弹性响应

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-05 DOI: 10.1016/j.jcsr.2026.110262

Ahmed T.M.A. El-Shweekh , Redhwan M. Algobahi , Aly G.A. AbdelShafy , Mohamed F.M. Fahmy

In accelerated bridge construction (ABC), the resilience of self-centering (SC) concrete-filled steel tube (CFST) bridge columns is closely linked to the performance of their energy dissipation (ED) system, which in this study is provided by a buckling-restrained steel (BRS) plate; however, ensuring stable BRS behavior under seismic loading remains a critical challenge. To address this issue, a three-dimensional finite element model (3D-FEM) was developed using commercial software to simulate SC CFST bridge columns equipped with BRS plates, and a total of 33 numerical models were analyzed by varying BRS geometry, axial load ratios, and material properties. The accuracy of the developed FEM was verified through strong agreement between the numerical predictions and available experimental data. The results demonstrated that the investigated design parameters exert a significant influence on overall system performance, and that the stability of the BRS plate is primarily governed by the out-of-plane slenderness ratio (L/i). Based on these findings, two design strategies are recommended to ensure the desired resilience: adopting a stability-based approach to optimize the geometry of the BRS plate, and employing a fully buckling-restrained steel system instead of a partial one.

在桥梁加速施工中，自定心钢管混凝土（CFST）桥柱的回弹性与其耗能系统的性能密切相关，在本研究中，耗能系统是由抗屈曲钢板提供的；然而，确保在地震荷载下稳定的BRS性能仍然是一个关键的挑战。为了解决这一问题，利用商业软件开发了一个三维有限元模型（3D-FEM）来模拟安装BRS板的SC CFST桥柱，并对33个不同BRS几何形状、轴向载荷比和材料性能的数值模型进行了分析。数值预测结果与实验数据吻合较好，验证了所建立有限元法的准确性。结果表明，设计参数对系统整体性能有显著影响，且BRS板的稳定性主要受面外长细比（L/i）的影响。基于这些发现，建议采用两种设计策略来确保所需的回弹性：采用基于稳定性的方法来优化BRS板的几何形状，并采用完全约束屈曲的钢系统而不是部分钢系统。

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引用次数: 0

Post-fire mechanical properties and constitutive modeling of low-yield-point LY160 steel subjected to different cooling methods 不同冷却方式下低屈服点LY160钢火灾后力学性能及本构模型

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-05 DOI: 10.1016/j.jcsr.2026.110281

Hao Zhang , Jiajian Yi , Mingzhou Su , Gengyao Tian

In this study, the residual mechanical performance of post-fire low-yield-point (LYP) steel was investigated. Forty-two LY160 specimens were heated to different exposure temperatures for different durations and then subjected to cooling in air (CIA) or cooling in water (CIW); subsequently, monotonic tensile tests were conducted to evaluate their failure modes, fracture surfaces, stress–strain curves, and mechanical properties. All post-fire specimens exhibited significant necking, and microstructural analyses revealed numerous spherical dimples, indicating ductile fracture. All stress–strain curves were highly nonlinear, and the yield plateaus of the CIA and CIW specimens disappeared once the exposure temperature exceeded 600 and 400 °C, respectively. The yield strength (f_y,T) and tensile-to-yield-strength ratio (f_u,T/f_y,T) of LY160 steel were markedly influenced by the exposure temperature and cooling method. Notably, f_y,T significantly decreased and f_u,T/f_y,T substantially increased once the LY160 specimens were heated above 600 °C. This trend was different from that of other steels. The average f_y,T and f_u,T/f_y,T of the CIA specimens heated to 900 °C were 0.44 and 1.98 times, respectively, those of the control specimens, and the corresponding values of the CIW specimens heated to 900 °C were 0.58 and 1.57 times, respectively, those of the control specimens. As the exposure temperature increased, the tensile strength of LY160 steel initially remained constant and then decreased; the elongation after fracture and ultimate strain initially decreased and then increased; and the elastic modulus exhibited no change. Exposure time affected only the f_y,T value of the CIA LY160 and had minimal impact on the properties of the CIW LY160. Finally, equations were derived to predict the post-fire mechanical properties of LY160 steel according to exposure temperature and cooling method. The prediction equations were applied to formulate two constitutive models utilizing the Mander and Ramberg–Osgood models. The findings of this study offer a valuable benchmark for assessing the post-fire residual performance of energy-dissipating members made of LYP steel.

在本研究中，研究了火灾后低屈服点（LYP）钢的残余力学性能。将42个LY160试样加热到不同的暴露温度和不同的暴露时间，然后进行空气冷却（CIA）和水冷却（CIW）；随后，进行单调拉伸试验，以评估其破坏模式、断口表面、应力-应变曲线和力学性能。所有火灾后的标本都表现出明显的颈缩，显微结构分析显示许多球形韧窝，表明韧性断裂。应力-应变曲线均呈高度非线性，暴露温度超过600℃后，CIA和CIW试样的屈服平台消失；暴露温度和冷却方式对LY160钢的屈服强度（fy，T）和抗拉-屈服强度比（fu,T/fy，T）有显著影响。值得注意的是，当LY160试样加热到600℃以上时，fy，T显著减小，fu,T/fy，T显著增大。这种趋势与其他钢材不同。加热至900℃的CIA标本的平均fy、T和fu、T/fy、T分别为对照标本的0.44和1.98倍，加热至900℃的CIW标本的相应值分别为对照标本的0.58和1.57倍。随着暴露温度的升高，LY160钢的抗拉强度先保持不变后下降；断后伸长率和极限应变先减小后增大；弹性模量没有变化。曝光时间仅影响CIA LY160的fy，T值，对CIW LY160的性能影响最小。最后，根据暴露温度和冷却方式，导出了LY160钢火灾后力学性能的预测方程。将预测方程应用于Mander和Ramberg-Osgood两种本构模型。本研究结果为评价LYP钢耗能构件的火灾后残余性能提供了有价值的基准。

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引用次数: 0

Initial global imperfections of L-shaped double steel plate composite walls l型双钢板复合墙体的初始全局缺陷

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-05 DOI: 10.1016/j.jcsr.2026.110282

Yan Lang , Ying Qin , Tong Guo , Ganping Shu , Jiadi Liu , Zhonghua Liu , Xin Yan

Truss-stiffened double steel plate concrete composite walls (DSPCWs) are susceptible to global geometric imperfections during fabrication, transportation, and concrete casting. Existing studies often approximate these imperfections using a first-order elastic buckling mode, but this approach lacks validation against real measurement data, especially for irregular cross-sections. This study systematically investigates initial geometric imperfections in L-shaped and I-shaped DSPCWs using 3D laser scanning. Two macro-scale deformation indicators—centroidal-axis deflection and principal-axis rotation—are introduced to characterize global imperfections. By integrating finite element buckling analysis with numerical fitting, a multi-mode superposition method is proposed to represent measured imperfections more accurately. Key findings include: (1) Both L- and I-shaped walls exhibit coupled deflection–torsion deformations, with the torsional component being particularly significant—the torsion-to-deflection ratio of the I-shaped specimen reaches 2.506, underscoring the inadequacy of single-mode approximations; (2) The contribution of buckling modes to imperfections depends on limb-width ratios, with higher-order modes becoming more influential in walls with smaller ratios; (3) While multi-mode imperfections significantly influence stability strength, especially in walls with small limb-width ratios, they do not alter the global failure mode. The proposed multi-mode model offers a mechanically sound and metrologically validated approach for imperfection simulation in stability analysis of irregular DSPCWs.

桁架加筋双钢板混凝土复合墙（DSPCWs）在制造、运输和混凝土浇筑过程中容易受到全局几何缺陷的影响。现有的研究通常使用一阶弹性屈曲模式来近似这些缺陷，但这种方法缺乏对实际测量数据的验证，特别是对于不规则截面。本研究使用三维激光扫描系统地研究了l形和i形DSPCWs的初始几何缺陷。引入了两个宏观尺度的变形指标-质心轴挠度和主轴旋转-来表征全局缺陷。将有限元屈曲分析与数值拟合相结合，提出了一种多模态叠加法，以更准确地表示测量缺陷。主要发现包括：(1)L形和i形试件均表现出扭扭耦合变形，其中扭转分量尤为显著，i形试件的扭扭比达到2.506，说明单模态近似存在不足；(2)屈曲模态对缺陷的贡献取决于肢宽比，在肢宽比较小的壁面上，高阶模态的影响更大；(3)虽然多模态缺陷显著影响稳定强度，特别是在肢宽比较小的墙体中，但它们不会改变整体破坏模式。所提出的多模态模型为不规则DSPCWs稳定性分析中的缺陷模拟提供了一种力学上合理且经计量学验证的方法。

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引用次数: 0

Evolution of ultimate pressure of randomly corroded pipes based on stochastic numerical analysis and CNN 基于随机数值分析和CNN的随机腐蚀管道极限压力演化

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-02-05 DOI: 10.1016/j.jcsr.2026.110276

Ni Zhang , Pengyuan Li , Zhongwei Zhao , Zhancai Lao

Research on corroded pressure pipelines is of great importance, given their critical role in industries including oil and gas, chemical processing, water distribution, and power generation. Corrosion is among the most detrimental factors impacting pressure pipeline safety. Via stochastic finite element analysis, this study explores the degradation law of external ultimate pressure for randomly corroded pipelines concerning the mass loss rate χ. It also examines the effect of axial loading on the radial pressure of such pipelines and clarifies how geometric dimensions (characterized by diameter-to-thickness ratio) and material yield strength impact their ultimate radial compressive bearing capacity. Furthermore, a reduction coefficient is proposed to quantify the degradation of corroded pipelines' ultimate compressive bearing capacity. Results show that the study's conclusions apply to pressure pipelines of various strength grades. Meanwhile, a theoretical simplified formula for the reduction coefficient—covering the range of diameter-to-thickness ratios commonly used in engineering practice—is established. Moreover, an optimized convolutional neural network (CNN) is introduced to effectively predict the reduction coefficient for corroded pipelines with varying diameter-to-thickness ratios. Overall, this research lays a foundation for the safety assessment of corroded pressure pipelines.

由于压力管道在油气、化工、配水、发电等行业中起着至关重要的作用，因此对腐蚀压力管道的研究具有重要意义。腐蚀是影响压力管道安全的最不利因素之一。通过随机有限元分析，探讨了随机腐蚀管道外极限压力随质量损失率χ的退化规律。它还研究了轴向载荷对此类管道径向压力的影响，并阐明了几何尺寸（以直径与厚度比为特征）和材料屈服强度如何影响其最终径向压缩承载能力。此外，还提出了一个折减系数来量化腐蚀管道极限抗压承载力的退化。结果表明，研究结论适用于各种强度等级的压力管道。同时，建立了涵盖工程实践中常用的径厚比范围的理论简化折减系数公式。此外，引入优化的卷积神经网络（CNN），对不同径厚比腐蚀管道的折减系数进行有效预测。研究结果为腐蚀压力管道的安全评价奠定了基础。

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引用次数: 0