Ƙarƙashin taƙaitaccen gabatarwa don ƙididdige ƙididdiga masu shinge na iska don tunani

Ƙarƙashin taƙaitaccen gabatarwa don ƙididdige ƙididdiga masu shinge na iska don tunani

Halin gaba ɗaya:

Misali: shingen amo mai tsayi 2M;CC 2.5M nisa;Shigarkan gadar sama.

 1.Wind load lissafin

F_wb=K_o× K₁ × K₃ × W_d × A_wh

Ina

F_wb= Madaidaicin ƙimar nauyin nauyin iska (kN)

W₀= Matsalolin iska (kN/m2)

W_d= Zane matsi na iskar (kN/m2)

A_wh= Ketare yankin iska

V_5.5= Gudun iskar tushe mai ƙira a yankin da gadar take (m/s)

V_d= Tsara saurin iskar iska a tsayi Z (m/s)

Z= Tsawon sama da ƙasa (m)

Y= Yawan nauyi na iska (kn/m3)

K₀=Shirya ƙididdige ƙimar jujjuyawar lokacin maimaita saurin iskar.Don katakon kofi na babban gada mai ramin rami guda indes, k₀= 1.0;ga sauran gada k₀= 0.9;ga gada a lokacin gina ginin, k₀= 0.75;Lokacin da gadar ta kasance a wuraren da mahaukaciyar guguwa ke da haɗari, ƙimar K za a iya ƙara matsakaicin matsakaici bisa ga ainihin halin da ake ciki.

K₃= Adadin yanayin ƙasa da yanayin ƙasa, Gabaɗaya K₃= 1.0.

K₅= Matsakaicin saurin iska, k₅= 1.38 zuwa saman A, B, don C, D wanda shine K₅= 1.70.

K₂= Ƙimar gyaran gyare-gyare na canjin tsayin iska idan aka yi la'akari da nau'in tarkace da gradient;gyare-gyaren ƙididdiga K₂na saurin iskar da tsayin daka akan tsarin gadoji da ke cikin kwandunan tsaka-tsaki, kwaruruka ko wucewar tsaunuka da sauran lokuta na musamman an ƙaddara bisa ga nau'in ƙasa na aji B.

K₁= maƙasudin juriya na iska;

G= hanzarin gravitational, g=9.8m/s2.

Za'a iya raba rashin ƙarfi na ƙasa zuwa A, B, C, D.

Class A yana nufin saman tekun da ke bakin teku da tsibirin, bakin teku, bakin teku da hamada

Ajin B yana nufin filaye, ƙauyuka, dazuzzuka, tuddai, garuruwa da yankunan karkara waɗanda ke da ƙarancin gidaje.

Ajin C yana nufin yankunan birane masu tarin gine-gine

Class D yana nufin yankin birni mai tarin gine-gine da manyan gidaje.

Yankin na Class C ne, tsawo daga ƙasa shine 8.5m, an samo K₀= 0.9;K₁= 1.97;K₂= 0.86;K₅= 1.70;V_5.5= 33m/s.

So F_wh= ku₀k₁k₃W_d A_wh= 12.63kN

2. Ƙimar ƙira na ƙarfin kwance

S_wh= 1.4Fwh = 17.68 (kN)

H karfe mLokacin lankwasa gatari: M= 17.68×22.5=14.14 (kN·m)

H karfe shafi ne Ya sanya daga 150x150x7x10mm kasa misali karfe, halatta itace.= 215MPa, damuwa mai ƙarfi 125MPa, I_x= 1660cm4, W_x=221cm3, A=40.55cm2

3.Lissafin ƙarfin lanƙwasawa

Cika buƙatu.

4.Juyawa Lissafi

Meet bukata

5. Cikakken lissafin kwanciyar hankali

Cika abin da ake bukata

Sama lissafin lodi don tunani.