Calculation of compelled fluctuations of panel buildings

Abstract

The article discusses the dynamic calculation of the elements of the box structure of buildings under the action of seismic effects, taking into account the spatial work of the box elements, given by the displacement of their lower part according to a sinusoidal law. The equations of motion for each of the plate and beam elements of the box structure of the building are constructed based on the Kirchhoff-Love theory. Expressions for the forces, moments, and stresses of the plate elements, which balance the box elements' displacement, the boundary conditions, and the conditions of full contact through displacements and force factors in the contact zones of the plate and beam elements, are compiled. The general solution to the problem is constructed by decomposing the movement of box elements according to their shapes using the finite difference method. The calculation results are shown in graphs for the height of the box of bending moments, plate elements working in bending, and shear stresses of plate elements.

Numerical solution of the heat transfer equation using different schemes

“…But the drawback of the explicit scheme is that it fell into instability at dt=0.1 seconds. In the implicit scheme, it calculated the problem in dt=0.1 second and showed the solution clearly [36][37][38][39][40][41][42][43][44]. In this case, it gave an opportunity to find out their advantages and disadvantages by applying various schemes to the problem numerically [18][19].…”

Mathematical modelling of heat and hydraulic processes in a solar air heater with a concave air duct absorber

“…Here ∑ 𝜉 is the sum of the hydraulic resistance coefficients of the bottom air pipes on the absorber surface of the solar air heater Collector, v is the mean velocity, m/s; g is the freefall acceleration, m/s 2 [24][25][26][27][28][29][30][31][32][33][34].…”

Water purification and demineralization technology

“…In thе prеsеnсе оf thе аdditiоns 2-3 mg/dm 3 оf PHMG еquаl оr bеttеr quаlitу оf thе Sirdаrуа Rivеr wаtеr filtrаtе bу mоst indiсаtоrs wаs асhiеvеd аt lоwеr dоsеs (bу 10-20 mg/dm3) оf АS, whilе thоsе оf thе Nаrin Rivеr wаtеr-аt thе lоwеr (bу 20-40 mg/dm 3 ) dоsе оf АS аftеr аdditiоn оf 5 mg/dm 3 оf PHMG. Lоwеr dоsеs оf PHMG did nоt mаkе it pоssiblе tо rеtаin thе filtrаtе quаlitу аt thе lоwеr dоsеs оf thе соаgulаnt [11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”