Multistoried buildings

A Research for high strength and better performance characterstics of floor and roof systems are designed to carry gravity loads and transfer these loads to supporting beams, columns or walls. furthermore, they play a key role in distributing earthquake-induced loads to the lateral load resisting systems by diaphragm action. when building structures are subjected to dynamic loadings, the induced inertial forces are transmitted through floor slabs and resisted by vertical structural components such as shear walls and frames. in this situation, the floor slabs function as diaphragms placed between the vertical components. in analysis and design of three dimensional structures under seismic loading, the diaphragms are frequently assumed to be perfectly rigid. in certain type of structures, however, this assumption is found to create significant discrepancy on the lateral load distribution.this discrepancy frequently occurs in frame-wall structures, in which the vertical components consist of shear walls with high storey stiffness and relatively flexible frames. therefore, in the present work analytical parametric studies are done on high rise structures with simple frame and plate frame structures.

— In this paper study of nonlinear dynamic time history analysis of Twenty three storied RCC residential building considering different seismic/earthquake intensities is carried out and response of such building due to earthquake is studied. The building under consideration is modeled with the help of SAP2000V.14.00 software. Five different time histories have been used considering seismic intensities V, VI, VII, VIII, IX and X on Modified Mercalli's Intensity scale (MMI) for developing the relationship between seismic intensities and seismic responses. The outcome of the study shows similar variation pattern in Seismic responses i.e. base shear and storey displacements with intensities V to X. From the study it is recommended that analysis of multistoried RCC building using Time History method became necessary to ensure safety against earthquake force.

Background/Objectives: This presentation describes the main issues in pile foundation design involved in new construction and infrastructure development on the top of existing closed landfill sites necessitated in the urban areas today. As it is known, landfill itself is of different nature, and shows different behavior, when it is closed municipal sanitary landfill, construction debris, toxic or hazardous waste landfill, and causes different possible effects on pile foundations that are constructed to transfer loads from the desired new construction and any infrastructural development running through the landfill refuse down into the underlying soil strata. Landfill sites can undergo significant settlement caused by the decomposition, consolidation, and compression of the landfill material due to the weight of landfill refuse, existing cover soil, and new fill and/or structural loads associated with the proposed development over landfills. This presentation discusses the present state of the art assembled through a number of on ground case studies and suggests a systematic approach that can be developed into the pile foundation design guidelines involving challenges of advanced concrete technology, steel corrosion protection, environmental, geotechnical, site civil, and chemical considerations and the science of landfill characteristics.

In a decision making study, design alternatives are compared with respect to cost, performance, and reliability, and the best is selected. Often, due to the time constraints imposed by the design schedule and budget restrictions, the number of design alternatives considered is limited. This research focuses on composite flooring systems for multi-story buildings and the application of value techniques to the construction industry. The study uses data that obtained from the RSMeans Assemblies Books for the period 1997 to 2019. The data obtained from RSMeans consists of assemblies cost ($/sf of floor) as the dependent variable; and the structural span (ft.), superimposed load (p.s.f), unit cost of sheet metal ($/LF of sheet), unit cost of concrete ($/CY), unit cost of steel structural ($/ton), and total load (p.s.f) as the independent variables. A simple computer model is designed for recommending the optimal composite flooring system of a multi-story building, during the preliminary ...