scholarly journals Research on Self-Drilling Screwed Lap Connections in Steel Diaphragms and the Design Models

2019 ◽  
Vol 1 (1) ◽  
pp. 299-306
Author(s):  
Marcin Gryniewicz ◽  
Jerzy K. Szlendak
Keyword(s):  
Static Analysis ◽  
Safety Assessment ◽  
Structural System ◽  
Plane Shear ◽  
Design Models ◽  
Practical Design ◽  
Diaphragm Action ◽  
Building Safety ◽  
Thin Walled ◽  
Mathematical Design

AbstractIn this paper, the results of a research on thin-plate single-lap connections are presented. Such type of connections is popular in steel roofs made of trapezoidal plates and other thin-walled elements. In case of a building safety it is necessary to ensure that materials with proper durability and ductility are used. Connections are one of the most important components in such structures, particularly when in-plane strength of a roof is taken into account. So far, in many existing regulations, only general calculations of such connections are conducted. However recently, discrete and computational methods can be used to build new, expanded mathematical design models, such as those presented here. Such models could be useful in an advanced design where a static analysis is combined with the safety assessment of the connections in a structural system. This is difficult when sheeting is utilized as a structural in-plane shear diaphragm. These require to take into consideration the important interactions of structure with covering and covering with another covering elements. The research is an effect of authors works on practical design approaches. Such methods can be effectively used for structural designs of buildings where the stressed skin diaphragm action is involved. Finally, practical input values about connections can be acquired from the presented data.

Experimental and Numerical Investigation of Critical Buckle Load of Composite Specimens

2015 ◽  
Vol 732 ◽  
pp. 85-90
Author(s):  
Lukáš Bek ◽  
Radek Kottner ◽  
Jan Krystek ◽  
Tomáš Kroupa
Keyword(s):  
Static Analysis ◽  
Glass Fibre ◽  
Large Deformations ◽  
Bending Test ◽  
Test Results ◽  
Beam Test ◽  
Three Point Bending ◽  
Box Beams ◽  
Buckle Beam ◽  
Thin Walled

Different carbon and glass fibre strips were subjected to the double clamp buckle beam test. Furthermore, thin-walled glass fibre box-beams were subjected to the three-point bending test. Results of experiments were compared to different numerical simulations using buckling analysis or static analysis considering large deformations.

Lateral Load Performance of Panelized Wood I-Joist Floor Systems

2020 ◽  
Vol 70 (4) ◽  
pp. 428-438
Author(s):  
Sigong Zhang ◽  
Ying Hei Chui ◽  
David Joo
Keyword(s):  
Load Transfer ◽  
Mechanical Performance ◽  
Small Scale ◽  
Construction Time ◽  
Plane Shear ◽  
Floor Systems ◽  
Diaphragm Action ◽  
Wood Frame ◽  
Strength And Stiffness ◽  
Frame Construction

Abstract Panelized light wood frame construction is becoming more popular due to the faster construction time and shortage of onsite skilled labor. To use light wood frame panels effectively in panelized floor systems, panel-to-panel joints must be fastened adequately to allow load transfer between panels. They must also possess in-plane shear strength and stiffness comparable to stick-built, staggered-sheathed assemblies. This study was designed to develop efficient and effective panel-to-panel joints for connecting adjacent floor panels built with wood I-joists and evaluate the efficiency of the joints in achieving diaphragm action. At first, a number of these panel-to-panel joints were tested in the laboratory using a small-scale diaphragm test setup to determine their efficiency in transferring in-plane forces between panels. Test results showed that a small decrease in in-plane stiffness was expected for the most effective joints, but their strengths were significantly higher than at the same location in a conventional site-built floor diaphragm. The presence of blockings and use of two-row nailing were found to considerably improve stiffness and strength. These features can be used to mitigate the potential reduction in mechanical performance of panelized floor construction, in comparison with the site-built wood I-joist floor.

Advances in Safety Assessment Method for Thin-Walled Shell’s Structure Containing Defects

2013 ◽  
Vol 284-287 ◽  
pp. 592-596
Author(s):  
Yong Dan ◽  
Yi Han
Keyword(s):  
Safety Assessment ◽  
Safety Evaluation ◽  
Assessment Method ◽  
Existing Problems ◽  
Thin Walled

In this paper, the methods of the safety evaluation for thin-walled shells containing defects based on “Fitness for Service” principle were reviewed. The latest authoritative standards and codes for assessment in both domestic and international fields are introduced. The paper also proposes the existing problems in this field and discusses the main solutions of them. The innovation of the method and technical route mentioned in the resolvent are introduced at the same time. As a result, the trend of safety assessment method for thin-walled shell’s structure containing defects is prospected.

Some studies on static analysis of composite thin-walled box beam

1997 ◽  
Vol 62 (4) ◽  
pp. 625-634 ◽  
Author(s):  
R. Suresh ◽  
S.K. Malhotra
Keyword(s):  
Static Analysis ◽  
Box Beam ◽  
Thin Walled

The Damage Inspection and Safety Assessment on Steel-Sheet Pile Wharf Structural System

2006 ◽  
Vol 324-325 ◽  
pp. 1221-1224 ◽  
Author(s):  
H.H. Lee ◽  
P.Y. Chang
Keyword(s):  
Safety Assessment ◽  
Steel Sheet ◽  
Structural System ◽  
Sheet Pile ◽  
Two Stage ◽  
Second Stage ◽  
Inspection Strategy ◽  
Pile Type ◽  
The Cost

This study proposes a procedure of damage inspection for the infrastructure in the harbor. Because most infrastructures in the harbor are submerged under the water the damage inspection is very difficult to process. Normally, divers with special scheme of damage inspection are required and the cost is very expensive. Therefore, a two-stage inspection strategy is proposed. After the first stage of inspection the more detailed second stage inspection will be requested dependent on the examination results. In the second stage of inspection particularly, it is focused on the wharf structures of steel-sheet pile type, where the related items are identified corresponding to the characteristics of the structural system.

scholarly journals Study of Building Safety Monitoring by Using Cost-Effective MEMS Accelerometers for Rapid After-Earthquake Assessment with Missing Data

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7327
Author(s):  
Jian-Fu Lin ◽  
Xue-Yan Li ◽  
Junfang Wang ◽  
Li-Xin Wang ◽  
Xing-Xing Hu ◽  
...  
Keyword(s):  
Missing Data ◽  
Safety Assessment ◽  
Safety Monitoring ◽  
Cost Effective ◽  
Low Noise ◽  
Parameter Analysis ◽  
Structural Failure ◽  
Mems Accelerometers ◽  
Building Safety ◽  
Earthquake Assessment

Suffering from structural deterioration and natural disasters, the resilience of civil structures in the face of extreme loadings inevitably drops, which may lead to catastrophic structural failure and presents great threats to public safety. Earthquake-induced extreme loading is one of the major reasons behind the structural failure of buildings. However, many buildings in earthquake-prone areas of China lack safety monitoring, and prevalent structural health monitoring systems are generally very expensive and complicated for extensive applications. To facilitate cost-effective building-safety monitoring, this study investigates a method using cost-effective MEMS accelerometers for buildings’ rapid after-earthquake assessment. First, a parameter analysis of a cost-effective MEMS sensor is conducted to confirm its suitability for building-safety monitoring. Second, different from the existing investigations that tend to use a simplified building model or small-scaled frame structure excited by strong motions in laboratories, this study selects an in-service public building located in a typical earthquake-prone area after an analysis of earthquake risk in China. The building is instrumented with the selected cost-effective MEMS accelerometers, characterized by a low noise level and the capability to capture low-frequency small-amplitude dynamic responses. Furthermore, a rapid after-earthquake assessment scheme is proposed, which systematically includes fast missing data reconstruction, displacement response estimation based on an acceleration response integral, and safety assessment based on the maximum displacement and maximum inter-story drift ratio. Finally, the proposed method is successfully applied to a building-safety assessment by using earthquake-induced building responses suffering from missing data. This study is conducive to the extensive engineering application of MEMS-based cost-effective building monitoring and rapid after-earthquake assessment.

scholarly journals APPLICATION OF SUPERELEMENTS IN STATIC ANALYSIS OF THIN‐WALLED STRUCTURES

2004 ◽  
Vol 10 (2) ◽  
pp. 113-122
Author(s):  
Ireneusz Kreja ◽  
Tomasz Mikulski ◽  
Czeslaw Szymczak
Keyword(s):  
Static Analysis ◽  
Standard Procedure ◽  
Dimensional Model ◽  
Fem Model ◽  
Shell Elements ◽  
One Dimensional ◽  
Thin Walled Structures ◽  
Thin Walled ◽  
Proper Solutions

A concept of a beam superelement is suggested as a new tool in the static analysis of structures made of thin‐walled members. This proposal seems to be especially attractive for treating the problems where the existing one‐dimensional models do not provide proper solutions. This class of problems includes, for instance, the torsion of thin‐walled beams with battens and the determination of the bimoment distribution at the nodes of frames made of thin‐walled members. The entire segment of the thin‐walled beam with warping stiffener or the whole node of the frame is modelled with shell elements. The stiffness matrix of such thin‐walled beam superelement can be estimated according to the standard procedure of the enforced unit displacements. The accuracy of the proposed one‐dimensional model has proved to be comparable to that offered by the detailed FEM model where the whole structure is represented by a very large number of shell elements.

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