Abstract
Combining the advantages of the concrete-filled core-steel tube (CFCST) column and cross-shaped steel reinforced
concrete (SRC) column, a novel core-steel tube with T-shaped steel reinforced concrete (CSTRC) column is proposed. The steel
skeleton of CSTRC column consists of a core-steel tube and four T-shaped steels welded around the steel tube. Seismic
performance of the seven composite columns are investigated by quasi-static tests, the effects of the cross-section form of core
steel tubes, the steel flange width, and steel web height of composite column are also investigated. A finite element model is
developed to conduct parametric studies to determine how the axial compression ratio, tube diameter-thickness ratio, concrete
grade and steel ratio affects the bearing capacity and ductility of the composite column. The test results show that the T-shaped
steel arranged outside the steel tube reduce the discrepancies in the mechanical properties of the concrete inside and outside the
steel tube and play a positive role in restraining the concrete outside the steel tube. Compared with the contrast column, the
CSTRC column exhibits good seismic performance, bearing capacity and ductility. With a ratio of flange width to section width
of approximately 9/25, the outstanding ductility of CSTRC column is exhibited. The bearing capacity and the ductility of
column decreases with the increase of axial compression ratio. The bearing capacity and ductility of the column improves with
the increase of diameter-thickness ratio. The bearing capacity of column improves with the increase of concrete grade and steel
ratio, while the ductility is decreased.
Key Words
confinement mechanism; core-steel tube with T-shaped steel reinforced concrete column; experimental
study; numerical simulation; seismic behavior
Address
Peng Wang:1)School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China
2)Key Laboratory of Structural Engineering and Earthquake Resistance, Ministry Education (XAUAT), Xi'an 710055, China
Yang Tian:School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China
Qingxuan Shi:1)School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China
2)Key Laboratory of Structural Engineering and Earthquake Resistance, Ministry Education (XAUAT), Xi'an 710055, China
Chong Rong:1)School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China
2)Key Laboratory of Structural Engineering and Earthquake Resistance, Ministry Education (XAUAT), Xi'an 710055, China
Qiuwei Wang:1)School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China
2)Key Laboratory of Structural Engineering and Earthquake Resistance, Ministry Education (XAUAT), Xi'an 710055, China
Abstract
This paper presents a new attempt to explore the dynamic behavior and its economic implications for truncated
nanocomposite conical shells concerning educational infrastructures using techniques of artificial intelligence. The main theme
of the research work is dynamics buckling of carbon nanotube-reinforced composite shells, which find extensive application in
space environments and may have potential adaptations to ensure economical, eco-friendly educational settings. Material
properties of the nanocomposites are calculated using Mori-Tanaka model and, then, equations of motion are extracted utilizing
first order shear deformation theory (FSDT), Hamilton's principle, and energy approach. For the analysis of the dynamic
instability region (DIR), a hybrid model incorporating diffrential quadrature method (DQM) and Bolotin's method is used.
Furthermore, AI can be employed to optimize design parameters such as geometrical configurations and nanotube volume
fractions for improved structural performance and cost efficiency in educational settings. The findings have revealed that the
DIR increases with the increase of the higher frequencies by increasing the amount of CNT, which demonstrates that there is
some scope for dynamic stability and economic feasibility of the design in educational buildings, which can be further optimized
with the help of AI.
Abstract
For a novel prefabricated composite shear studs (PCSS) connectors, there are two kinds of effects, one is the steel
plates-concrete interface effect, and the other is the combined effect of the U-shaped groove formed by steel plates and the
horizontal stud pull-out action, which together constitute the core concrete confinement. To study these two effects on the shear
performance of PCSS, two sets of 6 parameterized push-out tests conducted to reveal the influencing rules and mechanisms. The
results show that both the two effects can enhance the shear performance of PCSS, delaying the cracking and debonding time
between the vertical steel plate and concrete. Compared to specimens with natural interfaces and those with interface treatment,
the peak load, ultimate load, and shear stiffness of the former increased. The core concrete confinement mainly enhances the
shear stiffness. The interface effect and core constraint synergy mechanism of PCSS was proposed: The U-shaped steel groove
provides a hoop effect, which works in conjunction with the uplift resistance of the horizontal studs to generate a core restraint
on the inner concrete. Then the interface effect and the restraint effect complement each other, enabling the steel plate and the
concrete to jointly bear the forces. This combined action extends the effective working time between the stud and the concrete,
enhancing overall shear resistance performance. Furthermore, the core constraint variation laws of PCSS were identified: full
section constraint occurs during the elastic stage, half-section constraint occurs during the plastic stage, and only the pull-out
effect of the horizontal bolts remains during the platform and failure stages.
Address
Yanmei Gao:1)Department of Bridge Engineering, School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2)School of Art and Design, Chongqing Jiaotong University, Chongqing 400074, China
Cheng Hu:Department of Bridge Engineering, School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Xuefei Wang:Guizhou Provincial Transportation Planning Survey and Design Institute Co., Ltd., Guiyang 550081, China
Yuchu Zhu:Department of Bridge Engineering, School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Zhongliang Liu:Department of Bridge Engineering, School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Abstract
This research investigates the material characteristics of a hybrid star hourglass shaped auxetic honeycomb, which
can be manufactured using 3D printing techniques. New analytical formulations are developed using an energy-based approach,
focusing on a single unit cell, to predict the equivalent in-plane mechanical properties. The plateau stress of the proposed
honeycomb structure is assessed at the densification stage of the unit cell by employing energy conservation principles,
balancing external work with plastic energy dissipation. The accuracy of the derived equations for equivalent stiffness is verified
against experimental data, demonstrating a favorable agreement between analytical predictions and experimental findings. Finite
element analyses are performed to validate the obtained relationships for plateau stress. Leveraging the established analytical
models, multi-objective optimization using Genetic Algorithm is applied to identify optimal values for both stiffness and plateau
stress. According to the obtained results, to select the best value for strut angle results in the optimum stiffness and plateau stress,
ranges between 9.5°-60° and 85°-88° proposed for Θ1 and Θ2 respectively.
Key Words
energy method; equivalent stiffness; optimization; plateau stress; star-hourglass shaped
Address
Amin Farrokhabadi:Department of Mechanical, Materials and Manufacturing Engineering Composites Research Group,
University of Nottingham Ningbo, China
Dimitrios Chronopoulos:Mecha(tro)nic System Dynamics (LMSD), Ghent and Aalst Campuses, KU Leuven University, Belgium
Abstract
This study proposes a novel Embedded Steel Plate-Concrete (ESPC) shear wall system aimed at improving
constructability and reducing costs. The system embeds steel plates within concrete and eliminates the need for boundary
elements. Using experimental data, a finite element model was developed to analyze variables such as steel plate thickness,
concrete thickness, studs spacing, and aspect ratio. The results indicate that increasing steel plate thickness improves stiffness
and strength; however, this effect diminishes beyond 12 mm due to the shear capacity limitation of the studs. Concrete thickness
had a minimal impact on shear strength, contributing only about 2%. Stud spacing proved critical, as narrow or wide spacing
resulted in reduced strength due to interference or weakened composite action. When the aspect ratio reached 1.0, combined
shear and flexural failure began to appear. Beyond this point, flexural failure became dominant, limiting the full development of
shear resistance. Comparison with four nominal shear strength Eqs. revealed that the combined strength of concrete and steel
(Vn1) and steel-only strength (Vn2) were accurate depending on the steel ratio, while the other two Eqs. (Vn3, Vn4) exhibited
significant discrepancies. This study emphasizes the need for new shear strength formulation tailored to ESPC shear wall
systems and provides data for future research and design applications.
Abstract
At present, current research on graphene platelet-reinforced metal foam (GPLRMF) beam' resonance is limited to
single excitation levels, such as main resonance and internal resonance. To fill the gap in this field, this article aims to study the
dynamic characteristics of beams under combined lateral and longitudinal excitations. First, a displacement field was established
based on the Euler-Bernoulli beam model, and the motion equations were derived using Hamilton's principle. Subsequently, the
Galerkin method was used to discretize the equations, and the amplitude-frequency response of the system was obtained via the
amplitude variation method (AVM). The article discusses in detail nonlinear behaviors such as jumps and bifurcations. The
correctness of the model was verified by comparing the results with published literature. Numerical results indicate that the
frequency sweep curve of combined resonance (stable solution domain, amplitude peak, hardening characteristics, etc.) is
influenced by multiple parameter combinations, including material properties, damping coefficients, external loads, and initial
phase angles. Additionally, the amplitude-frequency response curve of combined resonance can exhibit multiple jumps, a
phenomenon not observed in internal resonance.
Key Words
combined resonance; Euler-Bernoulli beams; nonlinear vibrations; principal resonance
Address
Yi-Han Cheng:College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China
Gui-Lin She:College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China
