The bearing capacity of the soil is a significant topic in geotechnical engineering, especially in foundation engineering, as the stability of any foundation depends on it. A structure with a very sound design may collapse standing on poor soil with low bearing capacity. As the depth of the water table increases, the ultimate bearing capacity of soil increases. The effect of an increase in depth on safe bearing capacity is predominant due to an increase in surcharge weight. The higher the water table, the lesser is as far as possible and strength of the soil. In this research, soil test reports of different locations of Dhaka city were collected, and the bearing capacity of the soil was calculated by Terzaghi's method based on a fixed foundation depth with a variation of water table depth. Bearing capacity was compared with the depth of the water table in graphical format and it was seen that bearing capacity of soil increases with the increase of water table depth.

Bangladesh's construction industry has grown significantly over the past two decades. The construction industry is progressing at a faster speed, which has raised the raw demand for building materials. Finding an alternative to natural aggregate in concrete casting as a partial replacement is a smart concept to protect natural resources. Our environment is severely harmed by the production of bricks. On the other hand, polystyrene, a common plastic packaging material, degrades to harm the environment and produces useless plastic waste. To conserve natural resources, it can be a good idea to use plastic trash as a partial replacement for natural aggregate in concrete casting. The addition of EPS to concrete offers a variety of benefits. These include reduced self-weight in structures, lighter weights during construction, and higher thermal resistance. In this experiment on the characteristics of concrete structure, expanded polystyrene beads have been used in place of coarse aggregate in this experiment. In various combinations (1:1:2), (1:1.5:3), and (1:2:4), EPS beads replace 0%, 10%, 20%, and 30% of the volume of the course aggregate portion. The compressive strength, unit weight and splitting tensile strength of these mixes are all measured for the complete testing procedure. The optimal levels of compressive strength, splitting tensile strength, and unit weight of 12.65 MPa, 1.89 MPa, and 46.28 kg/m3 respectively, and the normal concrete's compressive strength, splitting tensile strength, and unit weight of about 19.16 MPa, 2.05 MPa, and 12.24 kg/m3 are successfully developed in Grade M25 EPS-based concrete with a replacement percentage of 10%. The results indicate that EPS beads have the potential to produce lightweight concrete with a moderate strength grade that might be used in a wide range of applications.

Tall buildings are now preferred due to the scarcity of available land in cities and the rapid development of the urban population. People are now rising upward to avoid ongoing urban sprawl and to protect vital agricultural productivity. As the building's height increases, the lateral resisting system becomes just as important as the gravity supporting system. Diagrid has recently acquired favor for tall structures among the numerous lateral stability of tall buildings due to its structural efficiency and aesthetic possibilities given by the system's unusual geometric layout. Because of its triangulated construction, the diagonal components of the diagrid system can support both gravity and lateral loads. For this study, two structural models of 24-story buildings are used: one with a rigid frame structure and one with a diagrid structure. ETABS is used for modeling and analysis of buildings. The analytical findings are compared in terms of story drift and story displacement subjected to lateral loading. When compared to rigid framed structures, diagrid systems are far more effective at reducing drift and displacement. Because of the axial action of the diagonal parts, diagonal configurations carry shear. Shear is carried by rigid-framed constructions due to the bending of vertical columns.

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Concrete is a low-maintenance composite material that is primarily composed of cementitious material, water and gravel. It is often used construction material not only in Bangladesh but also across the world. The design of the concrete mix is a critical determinant of the qualities of the concrete. The fundamental ideas and comparative research of certain prominent concrete mix design methods from a qualitative perspective are presented in this work. Two types of concrete mix designs are used which are ACI 211.1-91 (2002) Standard and British Standard (1997) in this paper. Several factors have been determined in this study to choose between the ACI and British Standard. These approaches rely heavily on graphs, tables and bar charts with arbitrary values. The nominal maximum size of coarse aggregate, water to cement ratio (w/c), slump value and the % passing of fine aggregates are used here to change the amount of materials. Differentiating between these strategies allows for a better understanding of the impacts of variables. The ACI and British Standard have been used to compare how the w/c, fine aggregate to cement ratio (FA/C), total aggregate to cement ratio (TA/C) and fine aggregate to total aggregate ratio (FA/TA) are different for various strengths. The following study is expected to pave the path of concrete performance via extensive research on different suggested design factors.