Structures最新文献

{"title":"Advanced computational framework for fragility analysis of elevated steel tanks using hybrid and ensemble machine learning techniques","authors":"Mohammad Reza Akbarzadeh , Vahid Jahangiri , Babak Naeim , Ali Asgari","doi":"10.1016/j.istruc.2025.110205","DOIUrl":"10.1016/j.istruc.2025.110205","url":null,"abstract":"<div><div>This research examines the elevated steel tanks’ seismic fragility with emphasis on the impact of significant structural and ground motion characteristics on the parameters of the fragility curve. Focusing on prediction accuracy by sophisticated machine learning techniques and the underlying variable importance in driving the fragility response, the research introduces meaningful insights toward seismic design and retrofitting. The fragility curve is developed for several Engineering Demand Parameters (EDPs) containing Base Shear <span><math><mrow><mo>(</mo><msub><mrow><mi>V</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>)</mo></mrow></math></span>, Overturning Moment <span><math><mrow><mo>(</mo><msub><mrow><mi>M</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>)</mo></mrow></math></span>, Tower Displacement <span><math><mrow><mo>(</mo><msub><mrow><mi>X</mi></mrow><mrow><mi>s</mi></mrow></msub><mo>)</mo></mrow></math></span>, vertical liquid surface displacement <span><math><mrow><mo>(</mo><msub><mrow><mi>d</mi></mrow><mrow><mi>v</mi></mrow></msub><mo>)</mo></mrow></math></span>, meridional tank wall stress (Sigma), Elephant Foot Buckling <span><math><mrow><mo>(</mo><msub><mrow><mi>f</mi></mrow><mrow><mi>pb</mi></mrow></msub><mo>)</mo></mrow></math></span>, and base isolation displacement <span><math><mrow><mo>(</mo><msub><mrow><mi>U</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>)</mo></mrow></math></span>. A detailed sensitivity analysis is conducted using the Fourier Amplitude Spectrum Technique (FAST) to assess the impact of input characteristics on the median <span><math><mrow><mo>(</mo><mi>θ</mi><mo>)</mo></mrow></math></span> and dispersion <span><math><mrow><mo>(</mo><mi>β</mi><mo>)</mo></mrow></math></span> parameters of the fragility curve. For tanks that are not isolated, geometric characteristics like slenderness (S) and liquid height (H) play greater roles than material characteristics like the density of steel <span><math><mrow><mo>(</mo><msub><mrow><mi>ρ</mi></mrow><mrow><mi>steel</mi></mrow></msub><mo>)</mo></mrow></math></span>, emphasizing the structural superiority of geometry to material weight in seismic behavior. Likewise, environmental and ground motion inputs like peak ground acceleration (PGA) and site conditions (Field) show different types and magnitudes of impacts across the EDPs. For isolated tanks, sensitivity patterns change, with the damping ratio <span><math><mrow><mfenced><mrow><msub><mrow><mi>ξ</mi></mrow><mrow><mi>b</mi></mrow></msub></mrow></mfenced></mrow></math></span>, isolation base period <span><math><mrow><mo>(</mo><msub><mrow><mi>T</mi></mrow><mrow><mi>b</mi></mrow></msub><mo>)</mo></mrow></math></span>, and viscous behavior (ν), demonstrating significant impact on some, like <span><math><msub><mrow><mi>U</mi></mrow><mrow><mi>b</mi></mrow></msub></math></span> and Sigma, while others like H and R show minimal impact. These results highlight the variable-specific nature of fragility behavior, providing","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110205"},"PeriodicalIF":4.3,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on bond properties between corroded grout sleeves and concrete in a chloride environment","authors":"Qing-long Wang ,&nbsp;Qin Zhang ,&nbsp;Jia Li ,&nbsp;Wen-Jie Li ,&nbsp;Jun Huang ,&nbsp;Hai-Tao Zhao","doi":"10.1016/j.istruc.2025.110227","DOIUrl":"10.1016/j.istruc.2025.110227","url":null,"abstract":"<div><div>To study the bond mechanism between corroded grout sleeves and concrete, 18 grout sleeve concrete bond specimens were prepared for central pull-out tests. Three key parameters, including corrosion levels, grout sleeve diameters, and protective layer thicknesses, were evaluated. The results revealed that the bond properties between grout sleeves and concrete were significantly degraded as corrosion levels increased, and the bond strength was decreased by up to 84.54 % compared to the specimens without corrosion in this study. Meanwhile, the bond specimens exhibited penetrating cracks due to the corrosion of grout sleeves with the relatively large diameters, and pronounced macro-penetrating cracks were observed when the corrosion level was approximately 5 %. Finally, to predict the bond stress-slip responses between corroded grout sleeves and concrete, an analytical model was developed. The proposed predictive model shows excellent agreement with the measured bond stress-slip curves, which also demonstrates better applicability than existing bond-slip models proposed on the basis of studies on concrete and corroded reinforcing bars with the relatively small diameters.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110227"},"PeriodicalIF":4.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cyclic response of coral concrete: Coupled mechanical-acoustic emission analysis and machine learning-enabled damage identification","authors":"Kailong Lu ,&nbsp;Linjian Ma ,&nbsp;Xudong Chen ,&nbsp;Lu Dong ,&nbsp;Hansheng Geng ,&nbsp;Liqun Duan","doi":"10.1016/j.istruc.2025.110234","DOIUrl":"10.1016/j.istruc.2025.110234","url":null,"abstract":"<div><div>This study investigates the mechanical properties of coral concrete with different sizes under uniaxial cyclic loading, including peak stress, peak strain, stiffness degradation, plastic strain, stress degradation, and energy dissipation. Acoustic emission (AE) parameters, such as ringing counts and Felicity ratio, are analyzed to establish the relationship between these parameters and the damage state. The results show that with the increase in cyclic loading, the strength and stiffness of coral concrete degrade progressively, while plastic strain and stress attenuation significantly affect its long-term service performance. Given the limitations of traditional AE-based damage evaluation methods—such as relying on single parameters like b-value or cumulative ringing counts, which provide limited information, are sensitive to noise and testing conditions, and fail to capture the complex temporal patterns of damage evolution—this study adopts a machine learning approach with strong multi-feature fusion and temporal modeling capabilities. By integrating multiple AE parameters with a Bi-LSTM neural network, a damage identification framework for coral concrete under cyclic loading is established, enabling accurate modeling and prediction of damage evolution. The findings offer practical technical support for condition assessment and durability management of coastal engineering structures.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110234"},"PeriodicalIF":4.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural and thermal performance of masonry walls: Insights from TRM-based upgrading techniques","authors":"Flavio Stochino,&nbsp;Arnas Majumder,&nbsp;Andrea Frattolillo,&nbsp;Monica Valdes,&nbsp;Mauro Sassu,&nbsp;Fausto Mistretta","doi":"10.1016/j.istruc.2025.110200","DOIUrl":"10.1016/j.istruc.2025.110200","url":null,"abstract":"<div><div>Masonry buildings, often constructed without adherence to modern seismic standards, are highly vulnerable to seismic events. Retrofitting techniques, such as Textile Reinforced Mortar (TRM), offer effective solutions for enhancing both structural and thermal performance. This study investigates the retrofitting of hollow clay-brick and concrete-brick masonry walls using TRM systems composed of various textile combinations, including galvanized steel and glass fiber textiles, as well as basalt fiber with Inox steel micro-fiber textiles, along with configurations of four or five diatons. Structural performance was evaluated through in-plane cyclic tests, demonstrating a significant increase in load-bearing capacity: approximately 90 % for clay-brick walls and 23 % for concrete-brick walls. To address energy efficiency, the TRM-upgraded/retrofitted walls were thermally upgraded with lime-based insulating mortar (mixed with recycled aggregates) and assessed in a climate chamber. Results revealed a substantial reduction in thermal transmittance for upgraded/retrofitted clay-brick and upgraded/retrofitted concrete-brick walls, and drops of about 44 % and 34 %, respectively, were observed compared to un-strengthened samples. Notably, the recycled aggregates are responsible for improving the insulation property of the masonry wall. Overall, the integrated TRM retrofitting approach effectively enhances both the seismic resilience and thermal efficiency of masonry structures.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110200"},"PeriodicalIF":4.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compressive deformation modes and properties of 3D printed continuous fiber reinforced composite auxetic honeycomb structures regulated by structural parameters","authors":"Depeng Wang,&nbsp;Yanlu Chang,&nbsp;Ping Cheng,&nbsp;Yanni Rao,&nbsp;Yong Peng,&nbsp;Kui Wang","doi":"10.1016/j.istruc.2025.110214","DOIUrl":"10.1016/j.istruc.2025.110214","url":null,"abstract":"<div><div>In this study, continuous fiber reinforced composite (CFRC) auxetic honeycomb structures with different struts length ratios (<span><math><mrow><mi>h</mi><mo>/</mo><mi>l</mi></mrow></math></span>) and cell angles (<span><math><mi>θ</mi></math></span>) were designed and fabricated by 3D printing process. The compressive behaviors were investigated by in-plane compression tests in two directions (1- and 2-directions). The results showed that the structural deformation modes were influenced by structural parameters, thereby affecting compressive properties. <span><math><mrow><mi>h</mi><mo>/</mo><mi>l</mi></mrow></math></span> determined the strut contact forms, affecting the modes of structural deformation and stress evolution during compression. The structural deformation modes were divided into: strut-end no-contact collapse (<span><math><mrow><mi>h</mi><mo>/</mo><mi>l</mi></mrow></math></span> ≥ 2.0) and strut-end contact collapse (<span><math><mrow><mi>h</mi><mo>/</mo><mi>l</mi></mrow></math></span> &lt; 2.0) in 1- direction; hinge-like collapse (<span><math><mrow><mi>h</mi><mo>/</mo><mi>l</mi></mrow></math></span> &gt; 2.0), self-locking collapse (<span><math><mrow><mi>h</mi><mo>/</mo><mi>l</mi></mrow></math></span> = 2.0) and strut-end contact collapse (<span><math><mrow><mi>h</mi><mo>/</mo><mi>l</mi></mrow></math></span> &lt; 2.0) in 2- direction. And the triggering strains of these deformation modes increased with <span><math><mi>θ</mi></math></span>. Besides<em>,</em> <span><math><mi>θ</mi></math></span> also determined the capability of inclined struts to resist deformation, influencing structural load-bearing capacity. The compressive modulus and energy absorption showed a consistent dependence on <span><math><mi>θ</mi></math></span>, with opposite trends in different compressive directions. Moreover, the negative Poisson's ratio characteristics were also affected by structural parameters. Large <span><math><mi>θ</mi></math></span> (e.g. 75°) in 1-direction and small <span><math><mi>θ</mi></math></span> (e.g. 30°) in 2-direction should be avoided, as they could not maintain negative Poisson's ratio characteristics at large deformation. Finally, a comprehensive assessment method was proposed, and 2.0–60° specimen exhibited the best comprehensive performance among 60° specimens. This work provided references for the structural design and performance customization of 3D printed CFRC auxetic honeycomb structures.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110214"},"PeriodicalIF":4.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deep learning based nonlinear structural time history response prediction enhanced with multi-resolution convolution projection network","authors":"Zuohua Li ,&nbsp;Qitao Yang ,&nbsp;Qingfei Shan ,&nbsp;Jiafei Ning","doi":"10.1016/j.istruc.2025.110199","DOIUrl":"10.1016/j.istruc.2025.110199","url":null,"abstract":"<div><div>Deep learning has shown potential for efficient seismic time history response prediction and performance evaluation of building structures. However, conventional network designs often omit initial projection layers, limiting input sequence utilization such as seismic acceleration data and generating suboptimal intermediate features for subsequent processing. In this study, a Multi-Resolution Convolution Enhanced Gate Recurrent Unit (MRCE-GRU) network is proposed, featuring a novel projection layer that integrates parallel convolutional layers with varying receptive fields. This architecture enables robust multi-resolution feature extraction during initial processing step. Three case studies are conducted to evaluate the proposed network: predicting displacement responses of a moment-resisting frame, analyzing field-sensing acceleration responses of an instrumented building, and modeling hysteresis curves of a nonlinear material. Extended evaluations are performed on network hyperparameters, intermediate projection outputs, and computational efficiency. The results demonstrate that the MRCE-GRU network achieves high accuracy with average coefficients of determination <span><math><msup><mtext>R</mtext><mn>2</mn></msup></math></span> of 0.9590, 0.8784, and 0.9997 for three testing cases, respectively, while maintaining lightweight computational requirements compared to other methods. Moreover, the proposed projection network effectively captures critical features at an early step, transfers informative features to the subsequent layers, and ultimately enhances the response prediction performance.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110199"},"PeriodicalIF":4.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic behavior analysis of new self-centering prefabricated dual energy dissipation frames with metallic staged-yielding dampers","authors":"Fangfang Geng ,&nbsp;Youliang Ding ,&nbsp;YuChen Zhuang","doi":"10.1016/j.istruc.2025.110249","DOIUrl":"10.1016/j.istruc.2025.110249","url":null,"abstract":"<div><div>The new design dual energy dissipation self-centering prefabricated concrete (DED-SCPC) framework joint with the metallic staged-yielding dampers (MYDs) is proposed, and the specific fabrication and mechanics principle of the new joint are elaborated. The theoretical hysteresis behavior of the DED-SCPC joint reflects a new flag-shaped hysteresis curve with “two-inflection points and three-stiffness”. The refined numerical model of the DED-SCPC joint in ABAQUS and OpenSees are established and the quasi-static numerical analysis of the joint are performed, respectively. The hysteretic simulation results have verified the better seismic resilience of the new joint and accuracy of the OpenSees numerical model. The compressive and tension damage degree of the concrete, and the stress cloud map of MYDs are also analyzed. Subsequently, a four-span, six-story prefabricated DED-SCPC framework with the DED-SCPC joint is modeled by the OpenSees platform, and seismic fragility analysis based on the incremental dynamic analysis (IDA) is conducted. Three performance states are defined, including Immediate Occupancy (IO), Life Safety (LS), Collapse Prevention (CP). The results indicate that the DED-SCPC framework tends to reach the IO, and the failure probability also decreases accordingly at various seismic intensity. The DED-SCPC framework has the notable security ability and anti-collapse ability, corresponding to only 6 % and 0 % failure probability under the moderate earthquakes. Furthermore, the risk of collapse of the DED-SCPC framework is fairly low under major earthquakes.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110249"},"PeriodicalIF":4.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fracture properties and sustainability assessment of strain-hardening alkali activated composites of up to 100 % rubber aggregate","authors":"Hongshu Pan ,&nbsp;Zeming Yang ,&nbsp;Minglang Xue ,&nbsp;Jiaying Su ,&nbsp;Xiaocai Yan ,&nbsp;Zhanbiao Chen ,&nbsp;Jiaxiang Lin ,&nbsp;Yongchang Guo","doi":"10.1016/j.istruc.2025.110221","DOIUrl":"10.1016/j.istruc.2025.110221","url":null,"abstract":"<div><div>Strain-hardening alkali-activated composites (SHAAC) are eco-friendly materials with ductile fracture characteristics. This study investigates the effects of rubber powder (RP) replacement ratios (0–100 %) on the ductile fracture performance of rubberized SHAAC (R-SHAAC), focusing on the underlying toughening mechanisms. The ductile fracture process was quantified with initiation fracture energy <em>J</em>_IC and failure fracture energy <em>J</em>_IF. The RP toughening mechanism was revealed with matrix-cracking fracture energy <em>J</em>_m, fiber bridging fracture energy <em>J</em>_b, and composite fracture energy <em>J</em>_c. RP enhances R-SHAAC's fracture performance through three mechanisms: reduced matrix toughness, crack bridging, and improved fiber dispersion. R-SHAAC specimens exhibit ductile failure with a primary crack surrounded by dense microcracks. RP extends the steady-state multi-crack propagation phase, increasing <em>J</em>_IF by up to 89.9 % compared to the baseline. For most mixtures, <em>J</em>_m/<em>J</em>_c exceeds 60 %, indicating that matrix cracking is the primary mode of energy dissipation. However, RP replacement ratio above 75 % triggers over-saturated cracking, which shortens the steady-state cracking phase and advancing the onset of instability. In addition, the Technique for Order of Preference by Similarity to Ideal Solution analysis identified the mixture with a 25 % RP replacement ratio as the optimal balance between mechanical performance and sustainability. This study clarifies the influence of RP modification on SHAAC’s ductile fracture behavior, providing insights into toughening mechanisms and enabling the evaluation of R-SHAAC designs for sustainable, high-performance construction applications.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110221"},"PeriodicalIF":4.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of prestressed CFRP plates to improve the flexural capacity of full size box girders for bridge","authors":"Yong Li ,&nbsp;Ziming Zhou ,&nbsp;Weibing Xu ,&nbsp;Mengfei Xie","doi":"10.1016/j.istruc.2025.110230","DOIUrl":"10.1016/j.istruc.2025.110230","url":null,"abstract":"<div><div>With the growing prevalence of heavy-duty vehicles, highway bridges now subjected to service loads exceeding their original design load ratings. This discrepancy not only affects the service condition of highway bridges but also accelerate the deterioration of the bridge, leading the bridge to the need for reconstruction or repair to increase its rated load capacity. Consequently, bridge strengthening becomes imperative. In contrast to the traditional methods of enlarging sections or paste steel plates, prestressed carbon fiber reinforced polymer (CFRP) plates are used to strengthen bridges and improve cracking moment and flexural capacity without significantly increasing structural weight or reducing vertical clearance. Two full-scale prestressed concrete box girders with a total length of 25 m from a bridge requiring higher load ratings were selected as test specimens. A theoretical analysis of the two girders was conducted, and their mechanical behavior was evaluated through numerical simulation and flexural destructive testing. The results demonstrated that the strengthening increased the actual cracking moment and ultimate flexural capacity of the girder by 12.6 % and 13.6 % respectively. The ratio of ultimate load stress to allowable stress of the strengthened girder under a higher vehicle load rating was close to that of the unstrengthened girder under the original vehicle load rating, Which proved that prestressed CFRP plate strengthening effectively meets the requirements for increasing the vehicle load rating of the girder.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110230"},"PeriodicalIF":4.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical and theoretical investigation on the cyclic behavior of self-centering CFDST column-steel beam joints","authors":"Xueyuan Yan,&nbsp;Jitao Yu,&nbsp;Genliang Wang,&nbsp;Wenhui Chen,&nbsp;Shen Shi","doi":"10.1016/j.istruc.2025.110206","DOIUrl":"10.1016/j.istruc.2025.110206","url":null,"abstract":"<div><div>In this paper, a self-centering joint between the concrete-filled double steel tubular (CFDST) column and the steel beam is proposed. The joint was self-centered by prestressed strands when unloading, and energy was dissipated during loading by friction. This work is a numerical and theoretical exploratory study based on a modeling approach already validated by experiments, aiming to investigate the mechanical behavior of the novel self-centering joint and optimize its design parameters. The reasonableness of the joint model was verified by numerical simulation with ABAQUS finite element software, and the damage modes, hysteresis curves, and energy dissipation capacity of the joint were analyzed. A mechanism-based semi-theoretical restoring force model was established. Performed a parametric analysis on the primary factors influencing the mechanical behavior of the joint. The results indicated that there was a contradiction between self-centering performance and energy dissipation in the joint, and the ratio <em>β</em> between the moment resistance provided by the strands and that provided by the friction devices in the decompression moment of the joint played a key role in moderating the relationship between the two. A value of <em>β</em> between 1 and 1.5 was recommended for a balance between the two. The restoring force model of the joint provided a well-predicted mechanical behavior of the joint. The modified rigid model was more consistent with the numerical results. This study provided theoretical support and optimized design parameters for the design of CFDST column-steel beam joints with favorable self-centering performance and energy dissipation capability. The parameter analysis showed that increasing strand prestress increased the bearing capacity but potentially resulted in stress loss; an increase in friction force improved the bearing capacity and energy dissipation capacity, yet it augmented residual deformation; and an enlargement of the cross-sectional area bolstered both the bearing capacity and stiffness, albeit it also led to stress loss.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"81 ","pages":"Article 110206"},"PeriodicalIF":4.3,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}