Mist International Journal of Science and Technology

Journal Information
ISSN / EISSN: 22242007 / 27077365
Total articles ≅ 43

Latest articles in this journal

Tanvir Mustafy, Raquib Ahsan
Mist International Journal of Science and Technology, Volume 10, pp 43-55; https://doi.org/10.47981/j.mijst.10(02)2022.384(43-55)

Abstract:
In the recent decade, the concept of "structural health monitoring," or SHM, has gained prominence due to its promise of reflecting the condition of structures and facilitating the monitoring of their behavior. Bangladesh is a country with a long coastline, thus it is unfortunate that the SHM system has not been more widely deployed on the country's many highway bridges across rivers. Saving money on manpower, remote monitoring allows for accurate, up-to-date assessments of a bridge's structural soundness. Recent developments in sensor, communication, and storage technologies have made a worldwide SHM system for infrastructures possible. The primary goal of this investigation is to assess the performance of the structural health monitoring system on the Padma Multipurpose Bridge. Recent developments in SHM's integration with ITS show the usefulness of ITS devices (such as traffic cameras and traffic detectors) in analyzing bridge responses to multimodal traffic with varying loads or during critical events that cause excessive vibration beyond the normal limit, which can be of great assistance in tackling the Padma bridge's serviceability challenge. Integrating information from an ITS device with SHM may increase the reliability and precision of the SHM system. As a consequence of this integration, the SHM system would be less likely to misdiagnose damages (i.e., vibrations caused by big cars on a bridge may be perceived by a SHM sensor as a structural health concern of the bridge), resulting in decreased maintenance costs. This investigative study provided a summary of the SHM systems now in place for major bridges in Bangladesh, such as the spectacular Padma Bridge, and discussed their use and appropriateness in the near and far future.
Tauhid Ur Rahman, Sadib Bin Kabir
Mist International Journal of Science and Technology, Volume 10, pp 09-21; https://doi.org/10.47981/j.mijst.10(02)2022.389(09-21)

Abstract:
An iconic building linking Bangladesh's southwest to its northern and eastern areas is the Padma bridge, which spans the third-largest river in the world with a complicated topology. By boosting production, employment, transportation, and the national and regional economy, this multipurpose bridge is projected to boost GDP growth by 1.2%. This study's primary goal is to pinpoint the greatest challenges encountered during Padma Bridge's construction and explain how sustainable management procedures might be put in place to address such difficulties. The most challenging tasks included finding a suitable site, dealing with complex river morphology, overcoming geotechnical barriers, controlling unfavorable environmental conditions, assembling massive construction equipment and materials, maintaining the construction schedule, and dealing with the COVID epidemic. To resolve these construction challenges, massive river training works and a unique pile foundation design that consists of six floating heaps and one center pile with the largest raking pile in the center were both utilized. To get around the difficulties in superstructural design, longer pre-assembled steel truss girders, pre-tensioned Super-T girders in viaducts, seismic isolation devices, and the largest friction pendulum bearings in the world were all made. Only a small number of people experienced COVID-19 without any fatalities or causing delays in the construction schedule since the Project was kept operational during the COVID-19 period by tightly enforcing the COVID laws and limits on people's mobility. The field of construction management would undergo a paradigm shift with this sustainable management of construction-related difficulties, which might later be used to design more intricate bridges.
M. Y. Ali, S. A. Suma, M. R. Islam, M. Hadiuzzaman
Mist International Journal of Science and Technology, Volume 10, pp 01-07; https://doi.org/10.47981/j.mijst.10(02)2022.385(01-07)

Abstract:
This study describes the impact of the Padma Multipurpose Bridge in creating regional connectivity and mobility in traffic movement, thus contributing to the socioeconomic development of Bangladesh. It finds that the travel time between the Dhaka division and the southwestern region will be saved by about two hours for cars and buses and by over 10 hours for trucks due to new connectivity through the bridge. It will reduce the distance from Mongla Port to Dhaka by more than 100 km to 170 km and save a lot of working hours, which will further accelerate the growth of the country’s economy. Additionally, a total of 212.05 km of the new railway line is being constructed for the Padma Multipurpose Bridge, which will connect Dhaka with the country’s largest land port, Jessore. After the Padma Bridge Rail Link project is done, the travel time from Dhaka to Kolkata via Jessore will be cut in half, and it will take only 3 to 4 hours. Moreover, the bridge will also pave the way for putting in place a new route for the Trans-Asian Railway network. The Padma Multipurpose Bridge is estimated to boost the country’s annual GDP by 1.23 percent and the southwestern region’s GDP by 2.5 percent. Moreover, the Padma Multipurpose Bridge will reduce the poverty rate by 1.01 percent at the regional level and by 0.84 percent at the national level. This study finds that to take full advantage of the newly constructed bridge, the southern part of the outer ring road of Dhaka proposed in RSTP should be completed soon. Padma Multipurpose Bridge will work as a key component of Asian Highway-1, boosting economic growth in Asia and improving the country's standing on the continent.
Bsp Major General Md Wahid-Uz-Zaman
Mist International Journal of Science and Technology, Volume 10; https://doi.org/10.47981/j.mijst.10(02)2022.390(ix)

Khondaker S. Ahmed, Max T. W. Chuan, Jian Dai, Ang K Keng
Mist International Journal of Science and Technology, Volume 10, pp 65-78; https://doi.org/10.47981/j.mijst.10(02)2022.383(65-78)

Abstract:
Padma Multipurpose Bridge (PMB) is one of the most important projects in the history of Bangladesh due to its regional importance, economic benefit, and primary connectivity of one-third population of the country. The bridge is 6.15km long, connecting the ends of Mawa and Janjira in Bangladesh. The entire project is challenging to construct and complex in design as it contains both four-lane highways and train tracks supported by a double-deck composite warren truss. In this study, the dynamic response of the truss due to the moving train has been analyzed using the Moving Element Method (MEM). In this process, a separate finite element model has been developed using Finite Element (FE) program to convert the double deck truss into an equivalent beam. Analysis has been conducted for a series of different load cases, converging to the most realistic case where the actual train parameters are considered. Parametric studies have been carried out to determine the dynamic responses of the bridge with varying pier spacing and speed of the train. The most optimal solution has been discussed with the effect of the vibration of the train acting on the multi-purpose Padma bridge. The bridge's dynamic amplification factor (DAF) at a design speed of below 100km/hr is found 1.05. The parametric study shows that the critical train speed for the PMB is 1400km/hr resulting in the bridge resonance with a DAF of 18. It is also evident that with the increase of pier spacing the resonance of the bridge is expected to occur at a relatively lower speed.
Hossain Md. Shahin
Mist International Journal of Science and Technology, Volume 10, pp 33-41; https://doi.org/10.47981/j.mijst.10(02)2022.382(33-41)

Abstract:
Padma Multipurpose Bridge is situated on a section of the Padma river where the soil condition is highly heterogeneous and intermixed with different soil layers, for which pile design was the critical part. This paper describes the soil properties and ground profiling of the Padma Multipurpose Bridge. Different types of field and laboratory tests were carried out to obtain accurate soil parameters and ground profiles along the whole alignment of the bridge. Standard Penetration Tests, Cone Penetration Tests, and grain size analyses were conducted for the soil classifications and ground profiling. Flat Plate Dilatometer Tests, High Pressure Dilatometer Tests, and Self-Boring Internal Friction Tests were performed to obtain the stiffness of the different soil layers and shear strength parameters in field conditions. Cross-hole and Seismic Tomography Geophysical tests were executed to obtain seismic waves and dynamic shear modulus of each soil layer. Gel Push Soil Sampling technique was used to collect undisturbed samples of sandy soils to get accurate stress–strength-dilatancy characteristics of sandy soils through different laboratory tests. The soil was classified into three Units and some sub-units based on grain size and SPT-N value. Soil parameters were finalized based on both laboratory and field test results. The pile design was possible for accurate measurement of soil parameters and ground profiling along the alignment of the bridge.
K. S. Ahmed, S. M. Moniruzzaman, Tahsin Reza Hossain, Shamim Z Bosunia
Mist International Journal of Science and Technology, Volume 10, pp 57-63; https://doi.org/10.47981/j.mijst.10(02)2022.387(57-63)

Abstract:
The Padma Multipurpose Bridge (PMB) is one of the biggest megaprojects of Bangladesh connecting one third of the country with the capital city, Dhaka. The infrastructure is expected to produce considerable uplift on the nation’s transport system, the national and regional economy, employment, household income, and ultimately, poverty reduction. From construction and river management points of view, it is the most difficult and engineering innovation-intenstive project in the world. Hence the Padma Multipurpose Bridge (PMB) required analytical, computational and experimental studies. In this work, a 3D Finite Element (FE) model of the actual PMB containing a single (6x150m) 900m modules has been developed in MIDAS Civil, a commercial computer program for bridges. P-y soil spring model following API guideline has been developed to conform flexible support system of the bridge pier. Following BNBC 2020, the bridge's performance has been evaluated for the 475-year, 975 years, and 2475-year return periods for Service Level, Design Basis and the Maximum Credible Earthquake (MCE), respectively. The forced based design shows that the bridge pier reached only 28% and 36% of its axial and shear capacity respectively for an earthquake return period of 2475 years. On the other hand, the pier has reached a maximum of 41% of its total shear capacity for the same seismic level.
Abul Kalam Azad
Mist International Journal of Science and Technology, Volume 10, pp 79-84; https://doi.org/10.47981/j.mijst.10(02)2022.388(79-84)

Abstract:
The South and Southwestern part of the country is devoid of direct communication with the central part of Bangladesh due to the presence of the most important tributaries of Lower Ganges i.e. Padma River. To establish direct communication with those areas Government of Bangladesh Constructed Padma Multipurpose Bridge with the provision of road and rail traffic at the upper and lower deck of the bridge respectively. The Padma Bridge Rail Link Project (PBRLP) is the main passage connecting the East and the West of Bangladesh and is also a part of the Bangladesh-China-India-Myanmar corridor. This line is a single-track passenger-freight railway with a total length of 168.6 km. For the first time in Bangladesh, State of the Art technology ballast less tracks in Padma Bridge, its approach to viaducts and other viaducts are being adopted for providing a smooth operation for both freight and passenger traffic. Precast and prestressed long sleeper embedded in cast in-situ track slab ensures a maintenance-free track system for the railway. PBRLP, once completed will restore the missing link with the Trans-Asian railway and will provide a platform for connecting with the Dedicated Freight Corridor (DFC) of India in future. It will also contribute to the Gross Domestic Product (GDP) of the country by 1.0%.
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