Manufacture and structural performance of modular hybrid FRP-timber thin-walled columns

2020 ◽  
pp. 113506
Author(s):  
Weiqi Cui ◽  
Dilum Fernando ◽  
Michael Heitzmann ◽  
Joseph M. Gattas
Keyword(s):  
Structural Performance ◽  
Thin Walled

Beam-Like Major Compliant Joint Methodology for Automotive Body Structures

2010 ◽  
Author(s):  
Ali M. Shahhosseini ◽  
Glen Prater
Keyword(s):  
Dynamic Behavior ◽  
Structural Performance ◽  
Automotive Body ◽  
Concept Model ◽  
Metal Sheets ◽  
Development Procedure ◽  
Compliant Joint ◽  
Thin Walled ◽  
Noise Vibration ◽  
Body Joints

One of major difficulties in developing and employing a concept model of a vehicle is to develop a simple and accurate model of joints. A vehicle joint is a subassembly formed by several members that intersect together. It is a thin-walled structure formed by overlapping metal sheets fastened by spot welds. The study of the joints has been important, because they can deform locally. This flexibility can affect noise, vibration and harshness (NVH) characteristics of a vehicle plus other structural performance characteristics under different loading conditions. The main difference between various kinds of concept models is the representation of body joints. Joints are important components of the auto body because they affect significantly, and in some cases, they even dominate, the static and dynamic behavior of a model. This paper introduces a new beam-like major compliant joint methodology. Joints are simulated with different parametric representations that present the major differences among various concept models. The development procedure of the beam-like major compliant joint is explained and the benefits of using this representation are discussed.

Spot Weld Layout Optimization With Manufacturing Constraints for Vehicle Structural Performance

2010 ◽  
Author(s):  
Xueyuan Wu ◽  
Yong Xia ◽  
Qing Zhou ◽  
Wayne Cai ◽  
Robert B. Tilove
Keyword(s):  
Influencing Factor ◽  
Layout Design ◽  
Layout Optimization ◽  
Absorption Capacity ◽  
Spot Weld ◽  
Structural Performance ◽  
Manufacturing Constraints ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Crash Performance

Spot weld layout on thin walled vehicle structures is an influencing factor to the structural performance such as NVH, durability and crashworthiness. The weld layout is also subject to manufacturing constraints such as minimum weld pitch, thickness and curvature of flanges, and accessibility of weld gun. Using an S-shaped thin walled tube as an example, this paper presents a study of spot weld layout optimization considering both structural performance and manufacturing constraints for reducing design iterations between the performance design and the manufacturing design. First, several complex manufacturing constraints, including minimum spot weld pitch, maximum curvature of flange, etc., are mathematically characterized. Then, with and without typical manufacturing constraints, the weld layout is optimized respectively for crash performance and torsion performance of the structure. The effects of adding manufacturing constraints on the spot weld layout optimization are evaluated. The analysis results reveal that the crash performance responses are generally less sensitive to the spot weld layout while the torsion stiffness is closely related to the spot weld layout. To analyze why the crash performance is less dependent on the weld layout, a detailed study is further conducted to reveal the relation between the weld layout and the crash performance of S-shaped thin walled tube. It shows that the parameters for assessing the structural crash performance have distinct sensitivity to the spot weld layout design. For instance, the peak impact force is generally sensitive to the spot welds placed in the curved segment and the total energy absorption capacity is mainly determined by the curvature design of the tube instead of the spot weld layout design.

Influence of Angle Thickness towards Stiffness and Strength Prediction for Cold-Formed Steel Top-Seat Flange Cleat Connection

2013 ◽  
Vol 479-480 ◽  
pp. 1144-1148 ◽  
Author(s):  
Yeong Huei Lee ◽  
Cher Siang Tan ◽  
M.Md. Tahir ◽  
Shahrin Mohammad ◽  
Poi Ngian Shek ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Structural Integrity ◽  
Structural Performance ◽  
Design Stage ◽  
Strength Prediction ◽  
Finite Element Models ◽  
Steel Framing ◽  
Cold Formed Steel ◽  
Thin Walled

For the connection stiffness and strength prediction, Eurocode has showed an inadequacy as it will be affected by the thin-walled behaviour of cold-formed steel in actual structural performance. This paper performs a study on the connection stiffness prediction for cold-formed steel top-seat flange cleat connection with various angle thickness. Validated finite element modelling technique is applied for further advanced investigation. From the developed finite element models, it was realized that Eurocode has overestimated by the analytical stiffness prediction using component method for the studied connection which reduces the structural integrity in the design stage. A new proposal on connection stiffness prediction with influence of angle thickness for cold-formed steel top-seat flange cleat connection is presented to assist practicing engineers to design the cold-formed connection in light steel framing.

Structural performance of novel thin-walled composite cold-formed steel/PE-ECC beams

2021 ◽  
Vol 162 ◽  
pp. 107586
Author(s):  
Ahmed Sheta ◽  
Xing Ma ◽  
Yan Zhuge ◽  
Mohamed A. ElGawady ◽  
Julie E. Mills ◽  
...  
Keyword(s):  
Structural Performance ◽  
Cold Formed Steel ◽  
Thin Walled

Experimental Investigation on Wide-Span Cold-Formed Steel Roof Truss System

2012 ◽  
Vol 166-169 ◽  
pp. 1304-1307 ◽  
Author(s):  
Shahrin Mohammad ◽  
M.Md. Tahir ◽  
Cher Siang Tan ◽  
Poi Ngian Shek
Keyword(s):  
Construction Industry ◽  
Failure Modes ◽  
Environmental Conservation ◽  
Structural Performance ◽  
Total Load ◽  
Roof Truss ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
The Stability ◽  
Stability Issues

The needs of environmental conservation and speed development in construction industry today have forced the search for better technologies in structural roof truss construction. Cold-formed section is a better choice for roof truss system in sustainable design with several advantages e.g. reduce cutting down of trees, speedy in construction, stronger, lighter and flexible in erection. However the stability issues occurred when wide-span roof truss is implemented with thin-walled cold-formed steel member. A full scale testing for a 25 meter wide-span roof truss system was carried out at Universiti Teknologi Malaysia to study the structural performance. The overall span of the truss is 25m in length with the height of 4.7m and the width of 1.2 m, built up by cold-formed steel channel sections of 150 mm and 74 mm in depth. Uniform loads were placed on the top and bottom chords of the truss using cement bags. The roof truss deformed at a total load of 63.77 kN or 52.7% of the designed load. Failure modes of the truss system were being observed and discussed for further improvement of the truss design.

scholarly journals Theoretical Local Buckling Behavior of Thin-Walled UHPC Flanges Subjected to Pure Compressions

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2130
Author(s):  
Jeonghwa Lee ◽  
Seungjun Kim ◽  
Keesei Lee ◽  
Young Jong Kang
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Plastic Material ◽  
Local Buckling ◽  
Material Model ◽  
Failure Criteria ◽  
Structural Performance ◽  
Conventional Concrete ◽  
Buckling Behavior ◽  
Thin Walled

To enhance structural performance of concrete and reduce its self-weight, ultra-high-performance concrete (UHPC) with superior structural performance has been developed. As UHPC members with 180 MPa or above of the compressive strength can be designed, a rational assessment of thin-walled UHPC structural member may be required to prevent unexpected buckling failure that has not been considered while designing conventional concrete members. In this study, theoretical local buckling behavior of the thin-walled UHPC flanges was investigated using geometrical and material nonlinear analysis with imperfections (GMNIA). For the failure criteria of UHPC, a concrete damaged plasticity (CDP) model was applied to the analysis. Additionally, an elastic-perfectly plastic material model for steel materials was considered as a reference to establish differences in local buckling behavior between the UHPC and steel flanges. Finite element approaches were compared and verified based on test data in the literature. Finally, this study offers several important findings on theoretical local buckling and local bending behavior of UHPC flanges. The inelastic local buckling behavior of UHPC flanges was mainly affected by crack propagation due to its low tensile strength. Based on this study, possibility of the local buckling of UHPC flanges was discussed.

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