Pansipa mawu oyamba achidule a kuwerengera kuchuluka kwa zotchingira mphepo kuti zigwiritsidwe ntchito

Pansipa mawu oyamba achidule a kuwerengera kuchuluka kwa zotchingira mphepo kuti zigwiritsidwe ntchito

General situation:

Mwachitsanzo: 2M kutalika phokoso chotchinga;CC 2.5M mtunda;Ikanipa flyover.

 1.Wind katundu kuwerengera

F_wb=K_o× K₁ × K₃ × W_d × A_wh

Kuti

F_wb= Mtengo wokhazikika wa katundu wodutsa mphepo (kN)

W₀= Kuthamanga kwa mphepo (kN/m2)

W_d= Kupanga mphamvu yamphepo yamkuntho (kN/m2)

A_wh=Malo olowera mphepo

V_5.5= Kuthamanga kwamphepo yam'munsi komwe kuli mlatho (m/s)

V_d=Kuthamanga kwa mphepo yamkuntho pamtunda Z (m/s)

Z= Kutalika pamwamba pa nthaka (m)

Y=Kuchuluka kwamphamvu yokoka kwa mpweya (kn/m3)

K₀=Pangani coefficient yosinthira yanthawi yobwereza liwiro la mphepo.Kwa mtengo wa chikho cha mlatho waukulu wokhala ndi dzenje limodzi la indes, k₀=1.0;pa mlatho wina k₀= 0.9;kwa Bridge mu nthawi yomanga, k₀= 0.75;Mlatho ukakhala m'malo omwe amakhala ndi chimphepo, mtengo wa K ukhoza kuwonjezeka pang'ono malinga ndi momwe zilili.

K₃= Kukwanira kwa mtunda ndi malo, Nthawi zambiri K₃=1.0.

K₅= liwiro la mphepo, k₅=1.38 pamwamba pa A,B, pa C,D yomwe ili K₅= 1.70.

K₂=Chigawo chowongolera cha kusintha kwa kutalika kwa liwiro la mphepo poganizira za kuuma kwa pamwamba ndi kupendekera kwake;coefficient yokonza K₂Kuthamanga kwa mphepo ndi kusiyanasiyana kwa msinkhu pazigawo za Bridges zomwe zili m'mabeseni a intermontane, zigwa kapena maulendo amapiri ndi zochitika zina zapadera zimatsimikiziridwa molingana ndi gulu B pansi.

K₁= kukana kwa mphepo;

G= kuthamanga kwa mphamvu yokoka, g=9.8m/s2.

Pamwamba pa roughness akhoza kugawidwa mu A, B, C, D.

Kalasi A amatchula za nyanja yam'mphepete mwa nyanja ndi chilumba, gombe, nyanja ndi chipululu

Gulu B limatchula minda, midzi, nkhalango, mapiri, matauni ndi madera akumidzi okhala ndi nyumba zochepa.

Kalasi C imanena za madera akumatauni okhala ndi nyumba zambirimbiri

Kalasi D imanena za tawuni yomwe ili ndi nyumba zambiri komanso nyumba zapamwamba.

Derali ndi la Gulu C, kutalika kuchokera pansi ndi 8.5m, anapeza K₀= 0.9;K₁=1.97;K₂=0.86;K₅= 1.70;V_5.5= 33m/s.

So F_wh= k₀k₁k₃W_d A_wh= 12.63kN

2. Kupanga mtengo wa mphamvu yopingasa

S_wh=1.4Fwh=17.68(kN)

H zitsulo mnkhwangwa yopindika: M=17.68×22.5=14.14(kN·m)

Mzere wachitsulo wa H umapangidwa ndi 150x150x7x10mm zitsulo zamtundu wamtundu, mzere wovomerezeka.= 215MPa, kumeta ubweya wa nkhawa 125MPa, ndi_x= 1660cm4, W_x=221cm3, A=40.55cm2

3.Kuwerengera mphamvu yopindika

Kukwaniritsa zofunika.

4.Kupatuka Kuwerengera

Mndi zofunika

5. Lonse bata mawerengedwe

Kukwaniritsa zofunika

Pamwambapa mawerengedwe a katundu kuti afotokoze.