Dissertations/Theses - Department of Civil Engineering
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Item Evaluation of design parameters of near embankment underground tunnel structure(Department of Civil Engineering, 28-03-20) Rahman, Asker Rajin; Ahsan, Dr. RaquibNow-a-days, traffic congestion is a major problem in many cities. Due to excessive pressure on overland roadways, underground subway or roadway is regarded as an alternative solution to accommodate this huge traffic. For this reason, construction of a suitable underground tunnel is a good alternative. Because the urban tunnel construction is normally carried out in difficult and crowded city areas, one of major design and construction challenges lies in minimizing the induced ground movement, as it poses potential threats to nearby buildings and utilities along the tunnel alignment. Most of the previous works were done to study the impact of the tunnel excavation on adjacent buildings which is of major interest for tunneling construction in urban areas, due to the high interaction between tunneling and existing structures. In context of the previous studies, present study aims at investigating the design parameters (such as thickness, position) of an underground tunnel which is constructed in such a zone where a residential area is being developed far away from the business center, for example, near any river embankment, where new land is being developed using sand filling taken from the dredged materials from the bed of the rivers. The response of the nearby structures (displacement, bending moment, shear force) will not only be dependent on the construction sequence of the tunnel, but also will be dependent on the change in water level near the embankment as these embankments are subjected to a certain water head difference due to difference in water levels on both sides of the embankment causing seepage of water through the embankment and generating uplift forces in adjacent structures. Such phenomena may also induce lateral displacements to nearby tunnels, buildings and if overlooked, can cause severe structural damage at their base. In this particular study, a simple 2D plain strain model has been developed in PLAXIS-2D. Various scenarios have been simulated by construction of tunnel and varying the water level on one side of the embankment. The behavior of both nearby tunnel and building has been observed in terms of generated maximum displacement, bending moment and shear force. Simulated results show both increase and decrease in the parameters mentioned above for varying thickness of tunnel, vertical distance of center of tunnel from existing ground level, distance between tunnel center and center of structure and varying water head difference on both sides of the embankment. Model results in this research, incorporating some of these variations showed that a tunnel away from the embankment, just below the center of the road or any heavily loaded building, having lining thickness of 0.380m at 6.5m below ground level is adequate considering economy of tunneling and vertical displacements generated in nearby structures.Item Stability coefficient of moment resisting frame structure for different building parameters(Department of Civil Engineering, BUET, 29-09-21) Subbir Bin Harun, Md.; Ahsan, Dr. RaquibHigh Rise Moment Resisting Frame structures are exposed to both static and dynamic loads. The process of designing high-rise buildings depends on many parameters. Stability Coefficient is one of them. It indicates whether a Moment Resisting frame Structure needs a second order analysis or not. P-delta effect is secondary effect on a structure. It is also known as “Geometric non-linearity effect”. As number of stories increases P-delta effect becomes more important. If the change in bending moment and displacement due to lateral load is more than 10% of primary moment and displacement P-delta effect should be considered in design, that is, second order analysis is required. There are many important factors which take part in determination of stability coefficient. Load, base shear, earthquake load characteristics, story drift etc. play vital role in this factor. This study covers stability coefficient determination of ninety (90) moment resisting frame buildings for different building parameters to determine when it is necessary to perform the second order analysis. Moment resisting frames are considered as frames which resist 100% of seismic force and are not enclosed or adjoined by components that are more rigid and will prevent the frames from deflecting under seismic forces. In this study, three different aspect ratios of structure are compared individually in same seismic zone namely Seismic Zone II of Bangladesh. As a case study a commercial building located at Dhaka city of Bangladesh with a floor area around 1000 square meter per floor has been considered in this study. Each structure was analyzed, and designed separately for comparison. Comparisons were made for height of structure varying from two storied to thirty storied building. Comparisons were made for both symmetric and asymmetric buildings. The comparisons were made in terms of their stability coefficient obtained from Finite Element analysis. Finally, it is concluded that for up to 24 storied RCC building at Dhaka city in both the cases of symmetric and asymmetric commercial buildings considered in the case study one does not need to consider P-delta effect in the analysis.Item Post glacial deposits as foundation media in lower alluvial valleys and deltaic areas(Graduate College of the . Texas A&M University, 1965-05) Hayat Khan Eusufzai, Md. Hossain Sekander; Buchanan., Spencer J.For abstracts please see full textItem Studies of fundamental , properties and mechanical behavior of selected synthetic aggregates(Graduate College of the Texas A&M University, 1966-08) Das, Subodh Kumar; Ledbetter, Dr. W. B.For abstracts please see full textItem Study of failure of reinforced concrete highway bridges in East Pakistan(Department of Civil Engineering, BUET (CE), 1967-01) Salam, Sk. Abdus; Ahmad, Dr. W.For abstract please see full textItem Investigations on reinforced and prestressed concrete beams under combined bending ,torsion & shear(Department of Civil and Hydraulic Engineering, Indian Institute of science, Bangalore, 1967-05) Rangan, B. Vijaya; RAO, N. S. GovindaFor abstracts please see full textItem Behaviour of pre-stressed concreate beams with circular perforations(Department of Civil Engineering, The University of Leeds, 1969-08) Salam, Sk. Abdus; Neville, A. M.The behaviour of prestressed. rectangular beaTIs containing a single hole or an array of circular holes is reported. Theoretical and experimental studies are described, attention being given to th~ elastic stress distribution around the holes, the deflection of beams containing multiple holes, the ultimate load carrying capacity and to possible methods of strengthening perforated beams by additional reinforcement. Computer programmes are developed for the calculation of the stress distribution around holes for the application of prestress, pure bending and bending with shear. The experimental results from tests on a total of thirty- Seven beams show good agreement with the theoretical results •Item Influence of initially curved bars on the behaviour of reinforced concrete columns(Department of Civil Engineering (CE), 1969-10) Muhammad, Shafiul Alam; Abul Hasnat, Dr.For abstract please see full textItem Chemical treatment of surface waters for public water supplies in Dacca(Department of Civil Engineering, 1974-12) Ahmed, M. Feroze; Aziz, Dr. M.A .For abstract please see full textItem Study of the suitability of locally available filler materials for asphaltic concrete(Department of Civil Engineering, 1976-10) Golam Fariduddin Akhter; Abdur Rauf, A.F.M.For abstract please see full textItem Some characteristics of various water in and around Dacca city(Department of Civil Engineering, 1977-03) Tazul Islam; Aziz, Dr. M.A .For abstract please see full textItem Causes of failure of embankments - Dacca - Narayanganj - Demra embankments a case study(Department of Civil Engineering, 1977-06) A.M.M. Safiullah; Eusufzai, Dr. S.H.K.For abstract please see full textItem Evalution of the extension training program at comilla thana training and development center Bangladesh(Faculty of the Graduate School of Cornell University, 1977-08) A.K. Fazlul Bari; Leagans, J. PaulThe central focus of this study is to evaluate the extension training program at Comilla Thana Training and Development Center (TTDC). This center is conceived as an experimental attempt where the thana level officers of nation building departments serve as teachers and village cooperative society representatives called managers and model farmers serve as extension agents by attending continuous weekly training programs at TTDC. They maintain liaison between TTDC teachers and farmer-members of village societies. Data were collected through personal interviews using three different interview schedules designed for TTDC teachers, village representatives and farmer-members. Twenty-five village societies were selected randomly and the managers and model farmers of each selected village along with two randomly selected farmer- members were included for interview. All eligible teachers at TTDC were interviewed. Five objectives were set for investigation - the relevance of subject-matter; strengfus,weaknesses and needed changes in the training program; process of feedback; 'methods of training and the conditions necessary for successful role performance by teachers. The study reveals the fact that the relevance of the subject-matter is not consistent. On one hand, more training time is spent o~ topics which are not high in priority of the trainees' choice, and on the other, eighty per cent of the farmers do not find adequate answers to their '. questions. The 'manager-model farmer' approach is appreciated by all groups, but the low level of teachers' knowledge, the lack of facilities for conducting effective training classes, and administrative inefficienciesare mentioned as major weaknesses in the 'training program. The process of feedback between the teachers and village representatives and between the village representatives and farmer-members seems to be reasonably effective. The training methods believed by teachers to be effective are not used by them for lack of facilities. Economic hardship is mentioned by the teachers to be the major impediment in their successful role performance. The findings of the study reflect a set of deteriorating conditions in the training activities at Comi11a which further may signal a trend of worsening conditions in the whole Comi11a program. The pipeline from where the knowledge used to flow from the TTDC to the villages in early / ' years has now stopped due to failure in the production of new information. More collaboration with research institutes is needed to solve farmers' problems and produce new information. The findings also suggest that the curriculum of the training program needs to be changed to incorporate the priority the trainees desire. Training, being a part of the rural development program of Comi11a, i,tneeds to reinvigorate the / system levels at Comi11a and revitalize the institutional approach in order to have impact not only in training activities, but also the whole Comi11a program.Item Analysis of tall buildings with interconnected shear walls and frames(Department of Civil Engineering (CE), 1978-03) Mohammed Abdul Mannan; Choudhury, Dr. J.R.For abstract please see full textItem Comparison of stress-path method of settlement analysis with other methods applied to a lightly over-consolidated clay(Department of Civil Engineering, 1978-08) Muhammed Homayun Kabir; Eusufzai, Dr. S.H.K.For abstract please see full textItem Diagonal compression field theory for reinforced concrete beams subjected to combined torsion , flexure and axial load .(University of Toronto, 1978-10) Onsongo, Winston M.; Coldins, M. P.For abstracts please see full textItem Comparative study of approximate methods of multistoried building frame analysis(Department of Civil Engineering (CE), 1978-12) Shah Muhammad Yunus; Choudhury, Dr. J.R.For abstract please see full textItem Some aspect plain and reinforced brick masonry(Department of Civil Engineering, 1980-08) Habibur Rahman, Ahmad; Choudhury, Dr. J.R.For abstract please see full textItem Studies on the engineering properties of sub-soil with reference to foundation requirements in the coastal areas of Bangladesh(Department of Civil Engineering, 1980-12) Mahmud Musharraf Hussain; Ahmed, Dr. SohrabuddinFor abstract please see full textItem Design parameters for rural water supplies in Bangladesh(Department of Civil Engineering, 1981-04) Farooque Ahmed; Choudhury, Dr. J.R.For abstract please see full text