Aims and Scope
Recent Articles
Time Series Analyses and Modeling of Environmental Systems: Case Studies in Kuwait
Jasem M. Alhumoud, Nourah AlmeshaanBackground:
Time series is a sequence of measurements made at regular time intervals. Tremendous work has been done on pipe break investigation and maintenance, using different models. However, the authors have not found any research work on pipe failures in water distribution networks using time series.
Objective:
The principal objective of this paper was to investigate the applications of time series analysis in modeling man-made (pipe breaks) and natural (rainfall) environmental systems.
Methods:
This objective was satisfied by employing the Time-Domain (Box-Jenkins) approach to assess two case studies in Kuwait of a water distribution network (pipe failures), and from rainfall rates measurement of a solid waste disposal site, respectively. The statistical analysis of these data was conducted with the aid of the BMDP and SAS computer software packages and by the use of the P2T programming procedure for the Box-Jenkins method.
Results:
The results showed a significant correlation between the data and the time series models provides good estimates of pipe reliability and rainfall measurements.
Conclusion:
Based on the significant results, time series analyses could and should be useful by water authorities in planning pipe maintenance and inspection. Moreover, it is recommended and it would be very useful to conduct similar studies on pipes carrying other fluids such as gas, air and oil.
December 31, 2020
Articles
- December 21, 2020
Properties of Sustainable Concrete with Mussel Shell Waste Powder
October 26, 2020Integrated Empirical-mechanical Seismic Vulnerability Analysis Method for Masonry Buildings in Timișoara: Validation based on the 2009 Italian Earthquake
September 25, 2020The Effect of Cassava Starch on the Durability Characteristics of Concrete
September 24, 2020Effect of Gravel-sand Ratio on Physico-mechanical, Thermal and Macrostructural Properties of Micro Epoxy Polymer Concrete based on a Mixture of Alluvial-dune Sand
September 24, 2020Risk Factors Affecting Ground Improvement Work in the Gulf Corporation Council Countries
September 24, 2020The Effect of Hybrid Fibers Reinforcement on the Mechanical and Physical Properties of Concrete
Editor's Choice
Development of Ductile Truss System Using Double Small Buckling-Restrained Braces: Analytical Study
Hidajat Sugihardjo, Yudha Lesmana, Dwi Prasetya
Introdution:
This paper proposed a Small Buckling-Restrained Brace (SBRB) for the ductile truss moment frames and is called here as the Double Braced Truss Moment Frames (DB-TMF). The braces are located at the edge of the truss girder and are only placed around the building perimeter. The braces work in pair as a weak element (structural fuses) and is expected to effectively absorb the seismic energy. The proposed DB-TMF system is an extended development of the Knee Braced Truss Moment Frames (KB-TMF). The DB-TMF system is expected to carry the whole seismic loads, while the rest of the frame is designed to carry only the gravity loads.
Methods:
To study the performance of the proposed DB-TMF system, non-linear finite element analysis was carried out using the DRAIN-2DX package. From the analysis with various time history records, it was found that the drift ratio of the DB-TMF system is lower than the allowed story drift. The roof-top displacement shows an asymptotic behavior. The shape of the hysteresis curve tends to have a pinching shape. However, the cumulative ductility of the proposed system satisfies the requirements as a hysteretic structure. In the event of an earthquake, only the SBRB and the chords adjacent to the column element are damaged while the rest of the structural elements remain elastic which is expected.
Results and Conclusion:
Based on the performance evaluation of the DB-TMF system, the DB-TMF system is suitable for moderate seismic region and has smaller dimension steel sections compared to the KB-TMF system.
February 28, 2019
Other Post
- November 15, 2019
Seismic Fragility of Tall Concrete Wall Structures in Malaysia under Far-Field Earthquakes
December 20, 2019Seismic Performance of Steel Moment Frames Containing Concentric Bracing Equipped with Shape Memory Alloys
February 28, 2019Seismic Behaviour of 17th Century Khusro Tomb due to Site-Specific Ground Motion
December 28, 2017The State of Art on Super Structural Testing Machine in China
August 25, 2017Dynamic Response of RC Frame Structures Under the Action of Mining Blasting
July 31, 2017Light Transmitting Lightweight Concrete with Transparent Plastic Bar