Engineering Structures最新文献_第2页

Experimental, analytical, and numerical study of a wall-type self-centering slip friction damper 壁式自定心滑动摩擦阻尼器的实验、分析和数值研究

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-13 DOI: 10.1016/j.engstruct.2024.119296

Canxing Qiu , Haozhi Huangfu , Jiawang Liu , Yongping Cao , Xiuli Du , Hang Liu

{"title":"Experimental, analytical, and numerical study of a wall-type self-centering slip friction damper","authors":"Canxing Qiu , Haozhi Huangfu , Jiawang Liu , Yongping Cao , Xiuli Du , Hang Liu","doi":"10.1016/j.engstruct.2024.119296","DOIUrl":"10.1016/j.engstruct.2024.119296","url":null,"abstract":"<div><div>This paper proposes a novel wall-type self-centering slip friction damper (WSCSFD), which mainly comprises of the grooved T-shape and L-shape plates that are combined by stacked disc springs. The damper resists shear forces arising from the inter-story drifts under earthquakes. By leveraging the variable friction mechanism and the pre-compressed disc springs, the WSCSFD can provide self-centering capability and energy dissipation capacity. The configuration and working mechanism of WSCSFD were first discussed. And then, the theoretical equations governing the force–displacement relationship were derived. One reduced-scale damper specimen was fabricated to conduct the proof-of-concept tests. The test results validated the deformation mode and cyclic behavior of the WSCSFD. The hysteretic parameters related to seismic applications were quantified and discussed. To complement the experimental observations and gain a further understanding of the local behavior, three-dimensional finite element (FE) models were established in ABAQUS. Finally, to address the deficiencies of the damper specimen, some potential improvement approaches were suggested and evaluated through the validated FE models.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119296"},"PeriodicalIF":5.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Punching failure and analytical model for rectangular flat slabs with equal flexural capacities in orthogonal directions 正交方向抗弯能力相等的矩形平板的冲压破坏和分析模型

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-13 DOI: 10.1016/j.engstruct.2024.119305

Bowen Zheng , Wenzhong Zheng , Yanzhe Zhang , Gang Wang

{"title":"Punching failure and analytical model for rectangular flat slabs with equal flexural capacities in orthogonal directions","authors":"Bowen Zheng , Wenzhong Zheng , Yanzhe Zhang , Gang Wang","doi":"10.1016/j.engstruct.2024.119305","DOIUrl":"10.1016/j.engstruct.2024.119305","url":null,"abstract":"<div><div>Despite the practical use of rectangular flat slabs with equal flexural capacities in orthogonal directions, their punching behavior has not been addressed. In this paper, the mechanical behavior of such slabs under varying tensile reinforcement ratios and plan dimensions has been investigated, using nonlinear finite element analysis in ABAQUS. Initially, the numerical model of the interior slab-column connection under static vertical loads was developed and thoroughly verified using 20 symmetrical and 9 asymmetrical specimens, covering wide variations in various parameters. Subsequently, parametric studies were conducted on rectangular slabs with equal flexural capacities in both directions, utilizing 54 simulations. The results indicated that the slab aspect ratio strongly affected the load-rotation curves, tensile reinforcement stress, cracking patterns, and shear forces in both directions, as well as their symmetry, despite being designed with equal flexural capacities in orthogonal directions. A novel approach, derived from the critical shear crack theory (CSCT), was developed for this slab type and then compared with existing models. It is noted that the ACI code cannot accurately predict the punching capacity. Although the EN1992–1-1 (2023), MC2010, and CSCT models accurately predict punching capacity, especially when the MC2010 and CSCT models account for two directional rotations, they lack in predicting deformation capacity. However, the proposed model offers accurate predictions for punching and deformation capacities. Its innovations include refining the load-rotation equation, validating the CSCT failure criterion, and quantifying the non-uniform shear force between orthogonal directions.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119305"},"PeriodicalIF":5.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on shear behavior of steel fiber high strength concrete beams reinforced with GFRP bars 用 GFRP 钢筋加固的钢纤维高强度混凝土梁的剪切行为实验研究

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-13 DOI: 10.1016/j.engstruct.2024.119294

Wenliang Zhao , Jinjin Xu , Kaiming Pan , Xiaoyan Han , Zhimin Wu

{"title":"Experimental study on shear behavior of steel fiber high strength concrete beams reinforced with GFRP bars","authors":"Wenliang Zhao , Jinjin Xu , Kaiming Pan , Xiaoyan Han , Zhimin Wu","doi":"10.1016/j.engstruct.2024.119294","DOIUrl":"10.1016/j.engstruct.2024.119294","url":null,"abstract":"<div><div>Corrosion of steel reinforcement is the main cause of durability of reinforced concrete structures, and the use of fiber reinforced polymer (FRP) bars to replace steel bars is an effective way to solve the durability problems. Although FRP material has the advantages of high tensile strength and corrosion resistance, its lower elastic modulus leads to wider cracks and larger deformation in the service state. By adding steel fibers to the concrete matrix, the development of cracks in concrete members can be effectively inhibited and the shear capacity can be improved, and thus part or all the stirrups can be replaced to reduce the cost of manual tying. Therefore, experimental studies on the shear performance of 10 steel fiber high strength concrete beams reinforced with GFRP bars are carried out, and the effects of steel fiber content, stirrups spacing, and concrete strength on the failure mode, deformation, and shear capacity are analyzed. The results showed that under the same stirrups reinforcement ratio and concrete strength, adding steel fibers with a volume fraction of 0.75 % increased the shear capacity by 154.8 %. which indicates that the addition of steel fibers can significantly improve the shear capacity of the beam. Steel fibers can replace part or all the stirrups. Adding steel fibers with a volume fraction of 0.16 % can increase the spacing of stirrups from 150 mm to 200 mm, indicating that steels fibers can replace part of the stirrups. Steel fibers with a volume fraction of 0.65 % can completely replace the GFRP stirrups with a stirrup reinforcement ratio of 0.45 %. In addition, the equations for the shear cracking load and shear capacity of GFRP reinforced steel-fiber high-strength concrete beams are proposed, and the calculated results are in good agreement with the test values.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119294"},"PeriodicalIF":5.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cyclic behavior of beam-to-upright bolted connections: Experimental study of Chilean steel storage racks 梁对直角螺栓连接的循环行为：智利钢制仓储架的实验研究

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-13 DOI: 10.1016/j.engstruct.2024.119310

Eduardo Nuñez , Ramón Mata , Marcelo Sanhueza , Matías Hernández , Nelson Maureira , Néstor Guerrero

{"title":"Cyclic behavior of beam-to-upright bolted connections: Experimental study of Chilean steel storage racks","authors":"Eduardo Nuñez , Ramón Mata , Marcelo Sanhueza , Matías Hernández , Nelson Maureira , Néstor Guerrero","doi":"10.1016/j.engstruct.2024.119310","DOIUrl":"10.1016/j.engstruct.2024.119310","url":null,"abstract":"<div><div>In this research an experimental study to assess the cyclic behavior of bolted moment connection in racks structures is performed. The effect of bolt pretension in the response is evaluated. Sixteen full-scale steel rack joint configurations were subjected to cyclic load according to the protocol established in AISC Seismic provisions. The cyclic performance was evaluated in terms of hysteretic response, failure mechanism, energy dissipation, stiffness, and rotation on the components. Two different configurations were studied. The results showed that the steel rack connections using a 70 % of bolt pretension can accommodate a 0.8 My at 0.04 rad of drift angle, while the joints without bolt pretension reached values below 0.7 My at 4 % of rotation. The failure mechanism was controlled by weld fracture at 4 % of the rotation. A high dispersion in the energy dissipation pattern was obtained and a drop in energy dissipation of up to 4 times in all specimens tested for a 4 % rotation was developed. This phenomenon is due to the welding rupture between the beam and the L-connector. A degradation of the secant stiffness reached up to 60 % for 2 % rotation. Finally, the most important effect of bolt pretension on the cyclic response of steel rack connections was achieved in the increase of flexural resistance and rotation developed.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119310"},"PeriodicalIF":5.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and analytical study on flexural behavior of corroded RC beams strengthened with CFRP rods and UHPC 使用 CFRP 杆件和超高强度混凝土加固的受腐蚀 RC 梁弯曲行为的实验和分析研究

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-13 DOI: 10.1016/j.engstruct.2024.119299

Wentao Wang , Lei Li , Jing Chen , Kuangyu Dai

{"title":"Experimental and analytical study on flexural behavior of corroded RC beams strengthened with CFRP rods and UHPC","authors":"Wentao Wang , Lei Li , Jing Chen , Kuangyu Dai","doi":"10.1016/j.engstruct.2024.119299","DOIUrl":"10.1016/j.engstruct.2024.119299","url":null,"abstract":"<div><div>Recent research confirms that concurrent use of Ultra-High Performance Concrete (UHPC) and Carbon Fiber Reinforced Polymer (CFRP) yields superior strengthening effects on RC structures compared to individual applications. However, this combined strategy is underutilized in research on corroded structure strengthening. This study investigates the flexural behavior of corroded RC beams strengthened with UHPC and CFRP rods through experimental and numerical analyses. A total of 13 RC beams were designed with different corrosion levels (0 %−20 %) and strengthening forms (U-strengthened, T-strengthened). The four-point bending test results indicate a substantial increase in peak moments for the strengthened beams, with U-strengthened beams exhibiting higher bearing capacity than T-strengthened ones. Additionally, the failure mode of the strengthened beams tends to be brittle. Sectional analysis results demonstrate that before the longitudinal reinforcement yield, it mainly governs the sectional moment, while after yielding, CFRP rods control the moment. Moreover, UHPC tensile stress makes a non-negligible contribution to the moment.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119299"},"PeriodicalIF":5.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modal parameters to estimate the dynamic response of footbridges considering the human-structure interaction 考虑到人与结构的相互作用，估算人行天桥动态响应的模态参数

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-13 DOI: 10.1016/j.engstruct.2024.119271

Igor Braz do Nascimento Gonzaga, Michèle Schubert Pfeil, Wendell Diniz Varela

{"title":"Modal parameters to estimate the dynamic response of footbridges considering the human-structure interaction","authors":"Igor Braz do Nascimento Gonzaga, Michèle Schubert Pfeil, Wendell Diniz Varela","doi":"10.1016/j.engstruct.2024.119271","DOIUrl":"10.1016/j.engstruct.2024.119271","url":null,"abstract":"<div><div>Lightweight, low damping and slender footbridges are prone to human-structure interaction (HSI) effects, by which a new mechanical system is composed whenever walking subjects couple to the structure, imposing apparent modal properties, different from those of the empty structure. Codes and guidelines typically provide harmonic load models (HLM) in a procedure that does not take into account HSI effects. To do so, a modal analysis of the footbridge structure as a SDoF model characterized by apparent modal parameters equal to those of the coupled system may be employed. Therefore, the main contribution of this paper is the establishment of simple equations to calculate the apparent damping ratio and the apparent natural frequency of footbridges excited by the first harmonic of the human walking loads (1.7 Hz – 2.3 Hz), as functions of the modal parameters of the empty structure and the crowd density. The developed numerical tools are presented and validated with results from the literature, as the crowd model, the human-structure interaction mathematical model and the free vibration analysis of the coupled system. Comparisons between the results of the equivalent SDoF model of the coupled system subjected to a crowd moving load model and the system composed of the footbridge coupled to the moving biodynamic models of the pedestrians showed that the first procedure adequately simulates the HSI effects. Finally, it is shown that the proposed equations are suitable to estimate the dynamic responses of simply support footbridges allowing the consideration of the HSI effects in a straigthforward procedure.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119271"},"PeriodicalIF":5.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Motion adaptive vision-based vibration measurement and modal identification for the roof masts of a tall building 基于运动自适应视觉的高层建筑屋顶桅杆振动测量和模态识别

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-13 DOI: 10.1016/j.engstruct.2024.119278

Mingfeng Huang , Xianzhe Li , Kang Cai , Ahsan Kareem

{"title":"Motion adaptive vision-based vibration measurement and modal identification for the roof masts of a tall building","authors":"Mingfeng Huang , Xianzhe Li , Kang Cai , Ahsan Kareem","doi":"10.1016/j.engstruct.2024.119278","DOIUrl":"10.1016/j.engstruct.2024.119278","url":null,"abstract":"<div><div>On May 18, 2021, occupants in Saige Plaza Building felt significant building motions together with its roof masts caught in obvious vibrations (May 18 vibration event), which were recorded by a surveillance camera installed on the roof of the building. This study aims to investigate the vibration characteristics of masts by processing the video data using computer vision technique. A motion adaptive vision-based vibration measurement method (M-DAVIM) is firstly proposed, focusing on dealing with the adverse motion effects of the camera itself on measuring dynamic displacements. The M-DAVIM incorporates time-domain and frequency domain correction procedures to reduce noise caused by camera self-vibration, and utilizes a CNN-based object tracking method to search objects that blurred by camera shaking. Indoor periodic vibration tests and field tests of photovoltaic panels demonstrated that M-DAVIM outperforms previous vision-based methods in accurately measuring displacements under unfavorable conditions, such as target rotation, motion blurring, and background interference. The proposed M-DAVIM was then applied to measure the dynamic displacements of the roof masts of Saige Building and identify their modal parameters (frequencies and damping ratios) based on the limited video data. A vibration component of 7.60 Hz was identified as the camera self-vibration and was effectively corrected by the M-DAVIM method. Based on finite element analysis and given the wind condition, the twin-mast might mainly experience the vortex-induced vibration at 2.12 Hz with two masts vibrating synchronously in-plane along opposite directions during May 18 to 22, 2021. This study demonstrates the robustness and effectiveness of the M-DAVIM and shows its potential application for long-term field monitoring of large-scale structures under severe outdoor environments.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119278"},"PeriodicalIF":5.6,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metamodel-based optimization of a high-tension cable barrier in crash tests with a large SUV 基于元模型优化大型 SUV 碰撞试验中的高张力缆索护栏

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-12 DOI: 10.1016/j.engstruct.2024.119291

Dawid Bruski , Hongbing Fang

{"title":"Metamodel-based optimization of a high-tension cable barrier in crash tests with a large SUV","authors":"Dawid Bruski , Hongbing Fang","doi":"10.1016/j.engstruct.2024.119291","DOIUrl":"10.1016/j.engstruct.2024.119291","url":null,"abstract":"<div><div>Road safety barriers play an important role in improving road safety. Cable barriers are one of the types of road barriers. Cable barriers have favorable collision-related properties, especially in terms of the safety of the vehicle occupants. Despite the continuous development of road barrier systems, the current European standard EN1317, which is used to evaluate the performance of road barriers, does not take into account all possible crash scenarios and all possible types of impacting vehicles. Sport utility vehicles (SUVs) are one of the types of vehicles that the EN1317 standard does not consider. SUVs are widely used on European roads. The work aims to optimize a high-tension 3-cable barrier system in crash tests with a large SUV. The research utilized the methods related to the design of the experiment, numerical simulations of crash tests, metamodeling, and multi-objective optimization (MOO) algorithms – WSF and NSGA-II. In the optimization, two aspects of the barrier were considered, economical and structural. The primary result of the study was the determination of four optimized designs for the cable barrier. These designs represent different trade-offs between the objective functions, offering various solutions depending on the specific engineering needs. The proposed barrier designs are characterized, among others, by a reduction in barrier mass, a reduction in the lateral deflections of the barrier, and a reduction in the number of posts that would need to be replaced after an SUV collision. The methodology used and the results achieved may be useful in the process of designing, testing, and optimizing other road safety barriers.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119291"},"PeriodicalIF":5.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identification of bridge bearing disengagement by instantaneous frequencies extracted from the acceleration of a passing heavy vehicle 通过从驶过的重型车辆加速度中提取的瞬时频率识别桥梁支座脱离情况

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-12 DOI: 10.1016/j.engstruct.2024.119303

Zhiwei Chen , Yu Duan , Yao Zhang

{"title":"Identification of bridge bearing disengagement by instantaneous frequencies extracted from the acceleration of a passing heavy vehicle","authors":"Zhiwei Chen , Yu Duan , Yao Zhang","doi":"10.1016/j.engstruct.2024.119303","DOIUrl":"10.1016/j.engstruct.2024.119303","url":null,"abstract":"<div><div>Bridge bearing disengagement is often observed from the continuous girder bridge, which has the largest number of bridges. This study proposes an indirect method to identify the bridge girder-bearing separation using the time-varying instantaneous frequency extracted from the dynamic response of a heavy vehicle passing over a continuous girder bridge. Firstly, the dynamic response of a dual-axle heavy vehicle passing over a two-span continuous girder bridge is derived, where the time-varying instantaneous frequency is incorporated by the frequency modulation technique. Then, the iterative variational nonlinear chirp mode decomposition (i-VNCMD) is proposed to extract the time-varying instantaneous frequency from the dynamic response of the passing heavy vehicle. When the heavy vehicle passes over the bridge without bearing disengagement, the instantaneous frequency curve shows a periodic pattern due to the bearings; however, when the heavy vehicle passes over the bridge with bearing disengagement, the periodic pattern is broken, and the instantaneous frequency when the vehicle is just passing over the separated bearing drops significantly. Numerical simulations validate the proposed method and investigate the effects of vehicle mass, vehicle speed, number of bridge spans, and road surface roughness, etc. on the proposed method. An experimental study on a three-span continuous bridge in the laboratory is also presented to validate the proposed method further.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119303"},"PeriodicalIF":5.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exact geometric nonlinear analysis of frames modeled with nonprismatic shear-deformable elements defined by noncentroidal axes 使用由非中心轴定义的非棱柱剪切变形元素建模的框架的精确几何非线性分析

IF 5.6 1区工程技术

Engineering Structures Pub Date : 2024-11-12 DOI: 10.1016/j.engstruct.2024.119267

Francisco C. de Araújo , Protáze Mageveske , Richard Degenhardt

{"title":"Exact geometric nonlinear analysis of frames modeled with nonprismatic shear-deformable elements defined by noncentroidal axes","authors":"Francisco C. de Araújo , Protáze Mageveske , Richard Degenhardt","doi":"10.1016/j.engstruct.2024.119267","DOIUrl":"10.1016/j.engstruct.2024.119267","url":null,"abstract":"<div><div>This paper provides an explicit closed-form expression for geometric-stiffness coefficients for nonprismatic frame elements defined by their noncentroidal axes. The proposed formulation uses the element’s exact elastic stiffness coefficients and exact Timoshenko’s shape functions. One advantage of working with exact stiffness values is the obvious quality of the resulting tangent stiffness matrix, which is expected to be highly accurate. In addition, adopting frame elements based on noncentroidal axes enables the modeling of complex nonprismatic frame elements using simple, straight-line segments. Hence, beams having cross sections that vary asymmetrically around their straight centerlines can be consistently modeled in a simplified process. The formulation takes into consideration the correct interaction between axial and flexural effects. To validate the formulation’s robustness, we evaluate the geometric nonlinear in-plane response of several metal frames possessing nonprismatic elements with variable thin-walled monosymmetric cross sections. We compare these results with highly accurate 3D responses obtained using the <span>ANSYS</span> software.</div></div>","PeriodicalId":11763,"journal":{"name":"Engineering Structures","volume":"323 ","pages":"Article 119267"},"PeriodicalIF":5.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0