EXPERIMENTAL STUDY ON FALL PROTECTION DURING BRIDGE MAINTENANCE AND MANAGEMENT WORKS ON FRP INSPECTION PLATFORM

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Katsutoshi Ohdo ◽  
Yasumichi Hino ◽  
Hiroki Takahashi
Keyword(s):  
Experimental Study ◽  
Construction Industry ◽  
Structural Elements ◽  
Bridge Maintenance ◽  
Safety Belt ◽  
Bridge Girder ◽  
Fall Protection ◽  
Construction Accidents

Accidents from falls are a serious problem in the construction industry in Japan, where approximately 40% of fatal construction accidents are caused by falls. FRP inspection platforms are used for fall protection during bridge maintenance and management works. These structural elements are usually set on the side of an abutment for the inspection of the joint located between the abutment and a bridge girder. The hook of a safety belt is then fastened onto the guardrail of a platform when work is executed at a high location. Nevertheless, the degree of platform safety remains uncertain because of the properties of the FRP platform. In this study, therefore, the safety of a platform was experimentally confirmed through the use of 75-and 85-kg sandbags and a 100-kg human dummy. Results show that platform safety improved, as indicated by the sandbags remaining firmly attached to the hook latched onto a platform railing when they were dropped during the experiment.

Experimental Study On The Behavior Of Concrete Structural Elements In Natural Sea Water

1977 ◽  
Author(s):  
Jean Paul Peyronnet ◽  
Jacques Paul Trinh ◽  
M. Paul Kavyrchine ◽  
Michel Paul Seguin
Keyword(s):  
Experimental Study ◽  
Sea Water ◽  
Structural Elements

scholarly journals THE USE OF KNOWLEDGE MAP MODEL IN CONSTRUCTION INDUSTRY

2010 ◽  
Vol 16 (3) ◽  
pp. 332-344 ◽  
Author(s):  
H. Ping Tserng ◽  
Samuel Yen-Liang Yin ◽  
Meng-Hsueh Lee
Keyword(s):  
Tacit Knowledge ◽  
Construction Industry ◽  
Explicit Knowledge ◽  
Model System ◽  
Knowledge Map ◽  
Specific Domain ◽  
Bridge Maintenance ◽  
Practical Model ◽  
Use Of Knowledge ◽  
Classification Structure

The construction industry consists of many unstructured documents, which accumulate a large volume of tacit knowledge. In the general domain, a Knowledge Map can illustrate connections of knowledge and transfer tacit knowledge to explicit knowledge, but this is unsuitable on specific domain such as construction industry. This research generalized existing mapping rules to be applied to general and specific domain; and presented a novel and practical model for building knowledge map, named Knowledge Map Model (KMM). This model comprised of five procedures, including identifying problems, discussing with experts and users, establishing the classification structure, establishing the document base, and deciding the display model. Furthermore, this research establishes Knowledge Map Model System (KMMS) as a major tool to improve the knowledge map reused and shared among the practical process. Finally, this re‐search validated the KMM in a real project of bridge maintenance. Santrauka Statybos pramoneje taikoma daug nestruktūrizuotu dokumentu, kuriuose sukaupti tiksliai neišreikšti, numanomi duome‐nys. Bendruoju atveju žiniu žemelapis gali parodyti žiniu tarpusavio ryšius ir transformuoti numanomas žinias i tikslias žinias, tačiau tai netinka specifinems sritims, tokioms kaip statyba. Šis mokslinis tyrimas apibendrino esamas žiniu žeme‐lapiu sudarymo taisykles, kurios galetu būti taikomos bendrosioms ir specifinems sritims, ir pristate nauja, praktini žiniu žemelapio sudarymo modeli, pavadinta KMM (Knowledge Map Model). Modeli sudaro penkios procedūros: problemu identifikavimo, aptarimo su ekspertais ir vartotojais, klasifikavimo struktūros nustatymo, dokumento formos nustatymo ir sprendimo del vaizdinio parinkimo. Be to, šiais moksliniais tyrimais nustatyta, kad žiniu žemelapio modelio sistema (KMMS) yra svarbi priemone, padedanti pritaikyti žiniu žemelapio naudojima praktiniams tikslams. Galiausiai šis tyrimas pagrinde KMM taikyma vykdant realu tilto eksploatacijos projekta.

Experimental study of bond–slip in RC structural elements with plain bars

2014 ◽  
Vol 48 (8) ◽  
pp. 2367-2381 ◽  
Author(s):  
José Melo ◽  
Tiziana Rossetto ◽  
Humberto Varum
Keyword(s):  
Experimental Study ◽  
Structural Elements ◽  
Bond Slip ◽  
Plain Bars

The factors contributing to construction accidents in Pakistan

2017 ◽  
Vol 24 (3) ◽  
pp. 463-485 ◽  
Author(s):  
Hafiz Zahoor ◽  
Albert P.C. Chan ◽  
Ran Gao ◽  
Wahyudi P. Utama
Keyword(s):  
Construction Industry ◽  
Delphi Survey ◽  
Structured Interviews ◽  
Content Type ◽  
Contributory Factors ◽  
Similar Work ◽  
Safety Research ◽  
Accident Causation ◽  
The Government ◽  
Construction Accidents

Purpose The highest number of accidents in proportion to the employment rate is found in construction industry among all industries in Pakistan. The purpose of this paper is to identify and prioritize the contributory factors of accident causation that can significantly reduce the rate of accident in the construction industry. Design/methodology/approach In total, 32 contributory factors of accident causation were identified through a triangulation strategy comprising eight face-to-face semi-structured interviews with the academic and industry experts coupled with a comprehensive literature review. Delphi survey was then conducted among the four respondent groups (clients, contractors, safety official and academia) to prioritize these factors. A consensus was achieved among the respondent groups after conducting two rounds of Delphi survey. Finally, the results were validated using the technique of inter-rater agreement (IRA) analysis. Findings All the shortlisted accident causation factors were graded as “important” to “extremely important”. Moreover, a “moderate” to “strong level” agreement was developed among the respondent groups. The three most significant factors were highlighted as “poor enforcement of safety rules and regulations by the Government agencies”, “insufficient allocation of safety budget and safety incentives by the client”, and “insufficient provision of safety training and resources by the contractor”. Practical implications The findings will help the key stakeholders to prioritize their energies towards achieving zero accident in the construction industry. Moreover, addition of academic experts as one of the respondent groups will enhance the linkages between the academia and the industry practitioners. Originality/value Besides highlighting the underlying causes of construction accidents in Pakistan, a detailed methodology is presented in this study for the analysis and validation of the Delphi survey data, which can be extrapolated in other regions and industries for elements prioritization. The findings of the study can also be generalized for other developing countries having similar work environment. The results validation through the use of IRA analysis is an addition to the field of construction safety research. The study also authenticates the applicability of IRA analysis to assess the agreement level among the respondents.

scholarly journals A REAL-TIME LOCATION-BASED CONSTRUCTION LABOR SAFETY MANAGEMENT SYSTEM

2014 ◽  
Vol 20 (5) ◽  
pp. 724-736 ◽  
Author(s):  
Kwang-Pyo Lee ◽  
Hyun-Soo Lee ◽  
Moonseo Park ◽  
Hyunsoo Kim ◽  
Sangwon Han
Keyword(s):  
Real Time ◽  
Construction Industry ◽  
Management System ◽  
Safety Management ◽  
Economic Loss ◽  
Safety Management System ◽  
Labor Safety ◽  
Construction Safety Management ◽  
Construction Accidents ◽  
Early Warnings

The construction industry continues to record a high number of accidents compared to other industries. Furthermore, the ramifications of construction accidents are growing in terms of both economic loss and loss of life with trends toward larger-scale, more complex projects. For this reason, there is an increasing awareness of the importance of safety management in the construction industry, and the need for more effective safety management techniques. This paper introduces a real-time location-based construction labor safety management system that tracks and visualizes workers’ locations in real-time and sends early warnings to endangered workers. The system is developed by integrating: a real-time locating system (RTLS) for tracking of workers’ location; a location monitoring system for mapping the workers location on a computerized building model; and alarm technology for sending early warnings. The developed system has been applied to an apartment project and an RTLS technology test center in Korea, and proved to be effective in tracking and monitoring workers in real-time and preventing construction accidents. It is envisioned that the developed system will enable proactive construction safety management in South Korea and the methodologies developed in this study will be applicable to other contexts with minimal customization.

scholarly journals Experimental study on static response of prefabricated concrete bulb-tee bridge girder flange-to-flange connections

2021 ◽  
Author(s):  
Siyin Tu
Keyword(s):  
Experimental Study ◽  
Bridge Deck ◽  
Ultimate Load ◽  
Load Capacity ◽  
Wheel Load ◽  
Ultimate Load Capacity ◽  
Yield Line Theory ◽  
Line Theory ◽  
Bridge Girder ◽  
Ultimate Load Carrying Capacity

Prefabricated concrete Deck Bulb-Tee (DBT) bridge girder system requires precast girder flanges to be connected and formed bridge deck at site. In this study, a new bridge deck slab flange to flange connection system for precast DBT girders has been investigated. Two types of moment transferring connection and another two types of intermittent bolted connection were developed. A total of four full-scale bridge DBTgirders for the developed connection details were fabricated and then tested to collapse under simulated wheel load. This thesis reports on an experimental study on static behavior and ultimate load carrying capacity of bridge Deck Bulb-Tee girders jointed with proposed connection detail and technology. structural behavior, including stress and strain, crack formation and propagation, deflection, failure mode, and ultimate load capacity, has been identified. Experimental results are compared to those obtained using the Yield-Line Theory and the available Punching Shear Equations.

scholarly journals An Experimental Study of Mortars with Recycled Ceramic Aggregates. Deduction and Prediction of the Stress-Strain

2016 ◽  
Author(s):  
F. Guadalupe Cabrera-Covarrubias ◽  
J. Manuel Gómez-Soberón ◽  
J. Luis Almaral-Sánchez ◽  
S. Paola Arredondo-Rea ◽  
M. Consolación Gómez-Soberón ◽  
...  
Keyword(s):  
Experimental Study ◽  
Numerical Analysis ◽  
Construction Industry ◽  
Compression Strength ◽  
Ceramic Materials ◽  
Experimental Results ◽  
Recycled Aggregates ◽  
Stress Strain ◽  
Environmental Situation ◽  
Analysis Process

The difficult current environmental situation, caused by construction industry residues containing ceramic materials could be improved by using these materials as recycled aggregates in mortars, with their processing causing a reduction in their use in landfill, contributing to recycling and also minimizing the consumption of virgin materials. Although some research is currently being carried out into recycled mortars, little is known about their stress-strain (σ-ε); therefore this work will provide the experimental results obtained from recycled mortars with recycled ceramic aggregates (with contents of 0, 10, 20, 30, 50 and 100%), such as: the density, the compression strength, as well as the σ-ε curves representative of their behavior. The values obtained from the analysis process of the results are those of: σ (elastic ranges and failure maximum), ε (elastic ranges and failure maximum), and Resilience and Toughness; in order to finally obtain, through numerical analysis, the equations to predict their behavior (related to their recycled content). At the end of the investigation it is established that mortars with recycled ceramic aggregate contents of up to 20% could be assimilated just like mortars with the usual aggregates, and the prediction equations produced could be used in cases of similar applications.

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