The paper describes a new design solution of diaphragm stiffness for a multistory building, including a high-rise building, which eliminates the possibility of its combined action with the frame of the building on the vertical loads. This is achieved by the design of elements of shear wall coupling and current methods of determining wind effects…
This paper deals to problems of studying cracks in reinforced concrete beams under long-term loading by fundamental of reinforced concrete resistance theory (energy approach) was describe. The experimental study of bearing capacity of reinforced concrete beams with the form of plastic plates (artificial cracks) and without form of plastic plates (artificial cracks) with different coefficients…
The article investigates the numerical modelling of deformation process and fracture of the reinforced concrete beams with preformed organized cracks and without preformed organized cracks under the action of short-term and long-term loading. Identified that, the features was changed of stress-strain state of beam during the deformation process and the main factors determining process of…
Theoretical and experimental studies on waste heat recovery of combustion stack gas and heat transfer phenomena of a fully developed laminar flow of deionized water in vertical helical coils were carried out with coil dimensions: tube diameter to coil diameter, di/D=0.04-0.06 and pitch to coil diameter, p/D=0.1-0.25. The calculation of heat transfer data was based…
Heat transfer phenomena of a fully developed laminar flow of deionized water-based graphene nanofluids (DI-water/GNPs) in vertical helical coils for heat recovery of combustion stack gas was carried out with different helical coil dimensions. The GNPs particle concentrations were 0.05 and 0.08% by weight and the calculation of experimental heat transfer data was based on…
Overall heat transfer coefficient of helical coiled heat exchanger with graphene- deionized water (DI-water) for waste heat recovery of combustion stack gas including heat exchanger effectiveness, ε, were experimentally carried out. Various sizes of tube diameter (1.2-1.5 cm), coil diameter (19-24.5 cm), and coil pitch (2.8-6 cm) of helical coils 1-4 including different heat transfer…
The first and the second law analyses of a 20 kWe R245fa organic Rankine cycle (ORC) with low grade temperature heat sources were numerically studied. There were three different heat sources such as hot water, saturated steam, and combined hot water/saturated steam used to supply heat at the ORC evaporator. The heat source temperature was varied…
Performance analysis of a new PV/T-cascade heat pump design having 7-kW maximum cooling capacity for combined cooling, heat and power was simulated with the climate of Chiang Mai, a city in tropical area. The technique could enhance both electrical performance of PV/T module, and heat pump thermal performance for cool water (below 17oC) and hot…
Performance analyses and economic evaluations based on exergy-costing of a biomass-boiler organic Rankine cycle coupled with a cascade heat pump system for combined heat and power generation were investigated. The net power outputs of the Rankine cycles were 7 and 20 kWe at the condensing and evaporating temperatures of 40 and 100oC, respectively. The heat…
Discrepancies in the current design guidelines on externally bonded FRP shear strengthening for reinforced concrete (RC) structures had initiated this research study. It is generally believed that the erroneous and irrelevant effective FRP strain models adopted in many of the design guidelines, which are derived entirely based on the 45-deg truss analogy, contributes significantly for…
