Article
Engineering, Civil
Claudio Galeotti, Federico Gusella, Maurizio Orlando, Paolo Spinelli
Summary: The selective addition of bolted joints can improve the serviceability behavior of rack systems by reducing displacements. However, the beneficial effect of bolted connections on seismic performance is only noticeable when seismic actions are sufficiently high and connections undergo plastic deformation.
Article
Engineering, Civil
Martina Bernardi, Nadia Baldassino, Riccardo Zandonini, Arturo di Gioia
Summary: This paper presents a study on industrial steel storage pallet racks, which were subjected to full-scale tests. The behavior and failure modes of the racks were investigated, and the results were discussed.
Article
Chemistry, Multidisciplinary
Cristhian Ramirez Ortiz, Gilberto Areiza Palma, Albio D. Gutierrez Amador, Jose L. Ramirez Duque, Ruth E. Cano Buitron, Luis F. Gonzales Escobar
Summary: This paper investigates the seismic behavior of a steel beam-to-concrete-filled steel tubular column connection with external diaphragms. The results indicate that this connection exhibits good ductility and dissipation capacity, meeting the design requirements for earthquake resistance.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Bingqing Dong, Jinlong Pan, Jingming Cai, Li Xu
Summary: The study proposed a novel ECC ring beam connection for ECC-encased CFST columns, demonstrating higher load bearing capacity, ductility, and energy dissipation compared to concrete specimens. The relative reinforcement ratio significantly influenced the failure modes of the ECC connection, while increased circumferential reinforcement ratio and joint size positively impacted the seismic behavior of the ECC connection.
ENGINEERING STRUCTURES
(2021)
Article
Construction & Building Technology
Weiguang Zhang, Chaoqun Yu, Genshu Tong
Summary: This paper investigates the interaction between steel racks and supporting frames in the current design process. Different real structures (RS) are created by placing multiple steel racks with varying masses and stiffnesses on the first floor of a two-story main structure, while simplified structures (SS) are established as frames with the mass of steel racks concentrated on the first floor. Modal analysis is performed to analyze the relationship between the periods of RS and SS in the cross-aisle direction. The study also considers the influence of finite beam stiffness on the interaction between racks and the main structure by constructing different analysis models.
Review
Engineering, Civil
Francisco Lopez-Almansa, Oriol Bove, Miquel Casafont, Miquel Ferrer, Jordi Bonada
Summary: This paper presents a review of seismic tests on adjustable pallet rack systems, including tests on components, subassemblies, full racks, and stored goods. The examination of the experiments provides relevant conclusions and identifies research needs.
THIN-WALLED STRUCTURES
(2022)
Article
Construction & Building Technology
Yun-Long Zhong, Guo-Qiang Li, Yang Xiang, Yan-Bo Wang
Summary: A novel energy-dissipating steel beam-column connection incorporating the assembled steel rod energy dissipaters (ASREDs) was proposed in this paper to enhance the post-earthquake repairability of primary building structures. Experimental results showed that the proposed connection efficiently protected the primary structural members by restricting plastic damage, and the damaged connection could be easily repaired.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Cristhian Ramirez Ortiz, Albio D. Gutierrez Amador, Jose L. Ramirez Duque
Summary: The seismic behavior of a novel steel beam-to-concrete-filled steel tubular column connection with external diaphragms was evaluated using a finite element method model. The model was validated with experimental results and found suitable for use in high seismic threat areas. A monotonic test was used to qualify the connection and the model underwent two stages of simplifications to reduce computational time. The simplified model was used in a parametric study and all profiles met seismic performance requirements.
Article
Engineering, Civil
Merve Sagiroglu Maali, Mahyar Maali, Casim Yazici
Summary: Using screws instead of bolts can save costs in cold-formed steel structures. The thickness of gusset plates, beam thickness, and use of stiffeners are found to affect the behavior of screwed beam-column connections. Additionally, the failure mode shape and moment resistance value are determined by the gusset plate thickness, beam thickness, and C/P ratio.
Article
Construction & Building Technology
Haris Stamatopoulos, Kjell Arne Malo, Aivars Vilguts
Summary: The use of moment-resisting frames with semi-rigid connections in timber buildings allows for more open and flexible architecture. Screwed-in threaded rods with wood screw thread can be used as fasteners for beam-to-column connections, offering high axial stiffness and capacity. This study presents a structural concept for a beam-to-column connection using threaded rods and derives analytical expressions for rotational stiffness and forces in the rods based on a component-method approach. Experimental results show good agreement with the analytical predictions for stiffness.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Sang Whan Han, Soo Ik Cho, Taeo Kim, Kihak Lee
Summary: The strong column-weak beam (SCWB) moment ratio is specified in AISC 341 to prevent an abrupt column sway in steel special moment frames (SMFs) during earthquakes. However, the current calculation method does not consider the contribution of composite beam action, leading to potential column-sway in the SMFs. This study proposes a new method that includes the contribution of composite beam action, and demonstrates that it significantly improves the collapse performance of SMFs.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Junchao Fan, Junhai Zhao
Summary: This paper developed a prefabricated connection between concrete-filled double-skin steel tubular (CFDST) column and steel beam, and conducted a series of tests to investigate the seismic performance of the connection. The results showed that increasing the endplate thickness and changing the inner tube shape significantly improved the ultimate strength of the connection. The ultimate strength was not sensitive to the axial compression ratio and bolt diameter, while it decreased with an increase in the concrete fill degree. Increasing the endplate thickness, axial compression ratio, bolt diameter, and changing the inner tube shape resulted in higher ductility and accumulated energy dissipation. However, the ductility and accumulated energy dissipation decreased with an increase in the concrete fill degree.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Engineering, Civil
Feiliang Wang, Yan Han, Jian Yang
Summary: This study used a computer-based finite element approach to investigate the stiffness and resistance behavior of beam-column moment joints in portal frames constructed by cold-formed steel back-to-back channel sections. The numerical simulation method was validated against experimental outcomes, and a modified equation was proposed to predict the initial flexibility of the joints. Parametric studies revealed the effects of sheet width-to-thickness ratio, bolt-to-bolt hole tolerance, and overlap length on connection flexibility.
Article
Engineering, Civil
Nagaraju Mallepogu, Mahendrakumar Madhavan
Summary: This research evaluates the shear performance of CFS welded moment connections through 36 laboratory tests. The addition of flange cleats significantly improves the shear capacity of the welded shear connection. Two shear equations are proposed to represent the shear strength of the moment connection. The failure modes observed in the clip-angle indicate the effectiveness of flange-cleats in resisting free twisting of the beam. Design factors are also determined for different design methods.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Xiaoping Wang, Fuyong Liu, Xiangxue Li, Tao Li, Xiaoqin Xu, Zhonghe Shui, Huancheng Wu
Summary: In this study, a novel prefabricated light-steel beam-column connection is proposed and investigated. Experimental tests demonstrate that this connection has high static bearing capacity. It is found that plug welding the sleeve to the column significantly increases the bearing capacity of the connection, and fillet welding between the column and the channel connectors is crucial. It is recommended to adopt a configuration with single-truss beams for the beam-column connection.
APPLIED SCIENCES-BASEL
(2022)
Article
Computer Science, Interdisciplinary Applications
Dieu Tien Bui, Mu'azu Mohammed Abdullahi, Soheil Ghareh, Hossein Moayedi, Hoang Nguyen
Summary: The study utilized the whale optimization algorithm (WOA) and neural network (NN) to predict the concrete compressive strength (CSC), optimized the model structure through population-based sensitivity analysis, with results showing that WOA-NN provided the most reliable prediction.
ENGINEERING WITH COMPUTERS
(2021)
Article
Computer Science, Interdisciplinary Applications
Hossein Moayedi, Mohammed Abdullahi Mu'azu, Loke Kok Foong
Summary: The paper investigates the social behavior of Grey Wolf Optimization (GWO) in enhancing the neural assessment of friction capacity of concrete driven pile systems, compared with genetic programming (GP) algorithm. Through sensitivity analysis and neural network, it is found that GWO performs better in predicting engineering solutions.
ENGINEERING WITH COMPUTERS
(2021)
Article
Computer Science, Interdisciplinary Applications
Mahdi Shariati, Mohammad Saeed Mafipour, Peyman Mehrabi, Ali Shariati, Ali Toghroli, Nguyen Thoi Trung, Musab N. A. Salih
Summary: The study explores the use of artificial intelligence techniques for predicting the shear strength of C-shaped shear connectors. Slip and inclination angle are found to be the most influential factors on the shear strength. Considering only four parameters is sufficient for accurate predictions, and the extreme learning machine (ELM) performs slightly better than the artificial neural network (ANN) and adaptive neuro-fuzzy inference system (ANFIS) in terms of time and performance indices.
ENGINEERING WITH COMPUTERS
(2021)
Article
Computer Science, Interdisciplinary Applications
Mahdi Shariati, Mohammad Saeed Mafipour, Behzad Ghahremani, Fazel Azarhomayun, Masoud Ahmadi, Nguyen Thoi Trung, Ali Shariati
Summary: The study introduces a novel hybrid ELM-GWO model to predict the compressive strength of concrete with partial replacements for cement. The results demonstrate that combining the ELM model with GWO can efficiently improve performance, leading to superior performance indices compared to other models.
ENGINEERING WITH COMPUTERS
(2022)
Article
Construction & Building Technology
Mahdi Shariati, Ali Shariati, Nguyen Thoi Trung, Parham Shoaei, Farshad Ameri, Nasrollah Bahrami, Saeid Narimani Zamanabadi
Summary: This study evaluated the effects of alkali activator solution and utilization of silica fume on durability and microstructural characteristics of alkali-activated GGBFS pastes. The optimal paste with 12 M NaOH solution and SS:SH ratio of 2.5 exhibited the best performance. The inclusion of SF reduced water absorption and increased electrical resistivity, and the SS:SH ratio was found to have a higher contribution to acid attack resistance of AAS pastes.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Maziar Yazdani, Kamyar Kabirifar, Boadu Elijah Frimpong, Mahdi Shariati, Mirpouya Mirmozaffari, Azam Boskabadi
Summary: The increase in construction and demolition waste due to urbanization and population growth has raised concerns over environmental impacts. A novel simulation-optimization approach using a hybrid Genetic Algorithm is proposed to optimize waste collection routing. The results demonstrate high performance of the proposed simheuristic algorithm.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
Shahin Rajaei, Parham Shoaei, Mahdi Shariati, Farshad Ameri, Hamid Reza Musaeei, Babak Behforouz, Jorge de Brito
Summary: This study evaluated the effects of using crumb rubber and polypropylene fibre in alkali-activated slag mortars on the properties of concrete. The results showed that rubberized mixes reduced mechanical strength, while polypropylene fibre enhanced both mechanical strength and shrinkage resistance. The ecological and economic analysis revealed that rubberized mixes were more environmentally friendly and cost-efficient.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Peyman Mehrabi, Mahdi Shariati, Kamyar Kabirifar, Majid Jarrah, Haleh Rasekh, Nguyen Thoi Trung, Ali Shariati, Soheil Jahandari
Summary: This study investigated the use of recycled concrete aggregate and pozzolanic additives as partial replacements in pervious concrete. The results showed that using RCA decreased the density and strength of concrete, while pumice and nano-clay additives had positive effects on concrete properties. Different types of fibers also affected the performance of concrete, with steel fiber performing the best.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Soheil Jahandari, Zhong Tao, Mohammad Saberian, Mahdi Shariati, Jie Li, Masoumeh Abolhasani, Mostafa Kazemi, Aida Rahmani, Maria Rashidi
Summary: The research found that the combined application of lime and geogrid to clayey subgrade significantly enhanced its ductility and geotechnical characteristics, but excessive water pressure caused separation between geogrid layers and subgrade, leading to reduced uniformity and consistency. Moreover, controlling moisture to optimal levels can maximize the performance of subgrade, while excess moisture beyond optimal levels resulted in more voids, decreasing geotechnical properties.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Geosciences, Multidisciplinary
Mohammed A. Mu'azu
Summary: This study investigates the efficacy of teaching-learning-based optimization (TLBO) for tuning artificial neural network (ANN) and adaptive neuro-fuzzy inference system (ANFIS) in the prediction of the factor of safety for soil slope-footing system. The results show that TLBO can significantly improve the predictive accuracy of both models.
MATHEMATICAL GEOSCIENCES
(2023)
Article
Engineering, Multidisciplinary
Mohammed Abdullahi Mu'azu
Summary: Choosing a suitable training technique, hybridized with various optimization algorithms, is crucial for bearing capacity analysis. The study highlights the significance of applied stress as the most important input factor. The ESDA-ANN model demonstrates the best fit to the training and testing datasets based on RMSE and MAE values.
AIN SHAMS ENGINEERING JOURNAL
(2023)
Article
Construction & Building Technology
Seyed Mehdi Davoodnabi, Seyed Mohammad Mirhosseini, Mahdi Shariati
Summary: The behavior of angle shear connectors in steel-concrete composite floors under temperature increase was investigated numerically, showing that heat affects the performance of shear connectors. Connector dimensions, concrete strength, and temperature value directly affect the final strength of the floor, with increasing angle height potentially increasing strength up to a certain limit. Increasing the temperature up to 850 degrees C leads to significant reduction in shear strength.
STEEL AND COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
B. Pordel Maragheha, A. Jalalia, S. Mohammad Mirhosseinia
Summary: This study highlights the importance of considering the initial cause of failure in analyzing structural responses, and suggests that the use of buckling-restrained braces can significantly reduce the risk of progressive failure in braced steel buildings.
INTERNATIONAL JOURNAL OF ENGINEERING
(2021)
Article
Engineering, Civil
Nasim Irani Sarand, Abdolrahim Jalali
Summary: A new type of rocking zipper-braced frame has been developed to improve seismic performance by adding zipper columns, which reduce structural damage and are suitable for low- and midrise buildings.
PRACTICE PERIODICAL ON STRUCTURAL DESIGN AND CONSTRUCTION
(2021)
Article
Construction & Building Technology
Karim Nouri, N. H. Ramli Sulong, Zainah Ibrahim, Mahdi Shariati
Summary: This study investigated the behavior of stiffened angle shear connectors under isothermal fire loading through push-out tests. The full-length connectors exhibited higher shear resistance, while the half-length connectors showed greater ductility. Heating had a destructive effect on the connectors' resistance but led to increased ductile behavior.
ADVANCED STEEL CONSTRUCTION
(2021)
Article
Engineering, Mechanical
Willy Ank de Morais, Railson Bolsoni Falcao, Mario Boccalini Jr, Fernando Jose Gomes Landgraf
Summary: This study compares the fatigue behavior of bcc Nb-48 wt%Ti (Ti-36at%Nb) alloy parts processed by Laser Powder Bed Fusion (L-PBF) using two different types of powders (spherical powder produced by Plasma Atomization and irregularly shaped powder produced by Hydride-Dehydride). The results show that the fatigue behavior is similar for both powders, but the specimens produced from the Hydride-Dehydride powder have higher dispersed results. Fracture primarily occurs in the porosities near the machined sample surface, and the fatigue cracks propagate in a zigzag mode parallel to the L-PBF building direction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Guoxi Jing, Shuai Sun, Teng Ma, Shubo Li, Tian Ma, Junchao Wei, Jianchao Pang
Summary: This study proposes a parameter identification method for predicting the TMF life of CGI materials used in cylinder heads. The study evaluates the TMF behavior of RuT450 material and successfully predicts its TMF life using multi-objective optimization. The results highlight the influence of plastic strain amplitude, temperature, and strain rate on the damage mechanism and life prediction.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xin Zhang, Xu Li, Weipeng Xu, Kuidong Gao, Kao Jiang, Xinyu Wang, Hongxin Wei
Summary: Conical picks are commonly used in tunnel excavation and often experience high temperatures during the cutting process. This study investigated the influence of temperature on the wear of conical picks and proposed a method for measuring rock abrasiveness that takes into account the thermal effect. The experimental results showed that cooling liquid reduced the maximum temperature and the mean mass loss of the conical pick. Additionally, the study examined the characteristics of oxygen and found evidence of peeling, cracking, and oxidation on the grinding rod used for rock abrasiveness measurement.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Vivek Srivastava, Deependra Singh, A. G. Rao, V. P. Deshmukh
Summary: Engine gear failures are a significant concern in various industries. Investigating each gear failure and determining the root cause is important for preventing future failures. This study used experimental and numerical analysis techniques to investigate the premature failure of a flywheel gear in a marine diesel engine. The findings revealed that the gear failed due to overload stresses caused by overload torque generated from sudden inertial thrust in the internal combustionengine.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jun Zhang, Weidong Liu, Feilong Liu, Zhiqiang Yang, Jinfang Peng, Minhao Zhu
Summary: During a major overhaul of an aeroengine, a cracked stator vane of the low-pressure compressor was discovered, with the crack originating from a corrosion pit located on the arc transition between the leading edge and the upper edge plate. The fracture surface exhibited signs of fatigue cracks, indicating a pit-related fatigue crack. Metallographic examination revealed that most corrosion pits were distributed beneath the bulging or peeling paint layer on the leading edge and the concave side. Identification of the corrosion products showed the presence of sulfate and alumina, suggesting atmospheric corrosion as a likely cause for the cracked stator vane.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Juan Jose Jimenez de Cisneros Fonfria, Ester Olmeda, Susana Sanz, Maria Garrosa, Vicente Diaz
Summary: Energy absorbing devices in vehicles can partially transform impact energy and protect passengers. In this paper, the failure analysis of the underframe crumple zone in a train car was conducted through finite element simulations, showing that the component acted properly after the impact.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Fengqi Zhang, Gang Luo, Haiyang Zhang, Peihong Cong, Lulu Liu, Wei Chen
Summary: In this study, a predictive model for bird strike trajectory was developed based on the quasi-linear viscoelastic model. By combining simulation analysis under multiple conditions, the model reproduced the trajectory change law in low and medium speed bird impact experiments.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
S. M. de Gouveia, L. de Abreu Correa, D. B. Teles, M. Oliveira, T. G. R. Clarke
Summary: Emergency Shutdown Valves (EDSVs) are used in industrial applications to interrupt fluid flow during hazardous events. The damage to the valve seats can be detected by analyzing the pressure and torque data. This study compared three processing options and found that evaluating the complete signature with a Gradient Boosting Classifier algorithm is the most effective strategy.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xinyan Jin, Kai Wang, Hongwei Qian
Summary: This study investigated the root cause of an abnormal premature groove-clogging failure on a sink roll in a hot-dip galvanizing line. It was found that the failure was caused by the buildup of a large amount of Fe2Al5Znx dross in the grooves, and the key factor was the control of Tstrip.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Zhiqiang Li, Jie Li, Cen Li, Xiaodong Xie, Zhiyong Yang
Summary: In this study, the microstructure evolution of the material in the hot spot area of the high-speed train brake disc was observed and the mechanism of mechanical property degradation was obtained through tensile tests. The research results provide guidance for crack damage identification of the brake disc and condition-based maintenance.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Lijia Luo, Yincheng Wang, Wei Chen, Zuming Zhao, Wenfei Chen, Shiyi Bao
Summary: Tube-to-tube impact wear is a significant factor in the failure of alloy 690 tubes in nuclear steam generators. This paper investigates the wear damage mechanism and detection method of alloy 690 tubes under tube-to-tube impact loads. The results reveal the wear damage mechanism through analysis of macro and micro morphologies as well as metallographic structures. A nonlinear ultrasonic wave mixing method is proposed for damage detection and a detection device is developed to implement this method. Experimental results indicate that the damage mode of tube-to-tube impact wear varies with impact load and cycle number, and the nonlinear modulation index is effective in assessing the damage degree of alloy 690 tubes.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xing-Ju Yang, Feng Lin, Xu Du, Lu Qiu
Summary: This paper proposes a novel method of improving the progressive collapse resistance of RC frame structures by adding locally debonded kinked steel plates (KPs). Experimental tests and finite element analysis reveal that the addition of KPs significantly enhances the ultimate resistance and deformability of the beam-slab substructures. The mechanism of resistance improvement is explained, and an analytical model is developed for predicting the ultimate resistance of the structures.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Xiaohe Wang, Zengqiang Cao
Summary: This paper presents a dynamic installation (DI) method based on electromagnetic force to reduce damage to composite laminates and improve joint performance. The study shows that DI can effectively decrease installation resistance, reduce severe damage to laminates, and improve stress distribution in the joint.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Jitong Cui, Yingying Kong, Cuiwei Liu, Baoping Cai, Faisal Khan, Yuxing Li
Summary: This paper presents a method for quantifying the failure probability of hydrogen doped pipelines and utilizes Bayesian network for quantitative calculation. The results show that this method can more accurately assess the failure probability of hydrogen doped pipelines and provide a decision basis for preventing failure accidents.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Engineering, Mechanical
Yiping Jiang, Maoru Chi, Jungang Yang, Liangcheng Dai, Yuchen Xie, Zhaotuan Guo
Summary: This article investigates and simulates the derailment of empty freight trains at the switch section of a turnout in the diverging route, and proposes preventive measures. The results show that the derailment is caused by the combined effect of various factors, and reducing the longitudinal coupler force and the wheel rail friction coefficient can decrease the possibility of derailment. Additionally, installing a guard rail in front of the turnout can effectively prevent derailment.
ENGINEERING FAILURE ANALYSIS
(2024)
