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冲击荷载下高速公路护栏的实验研究和优化分析

华南理工大学学报(自然科学版)

第33卷笫1l期2005年11月

JoumalofsouthchinaulliversicyofTechnology

vol33

N0.112005

(Natllral

Science

Edinon)

Anicle

November

m:1000一565X(2005)1l一0098—06

ExperimentalInVestigationandop恤nizedAnaly鸵sof

HighwayGuardrailsUnderImpactLoads+

劢Ⅱo胁j溉1

乳i眈.蒯n1

勋增工i—gMn2

Tech.,Guallgzhou51删;40,Guangdo”g,China)

(1.C011。geofArchitectureandCivilEn舀ne甜“g,S邮thChinaUniv.ofTecIl,Cu皿gzhou5】o“O,Guaogdong,C}lina

coll呼ofTdhc

andcommunications,southchina

u赢0f

Abstmct:Thedynamicchamcteristics0fhi曲”aygIlardralls111】derj“lP8c“0adsaminvestigated姆exp鲥mImb

and

nnite—ek唧tan出y8es

decreasesalmost

The

re砌ts

indicatethat,withthetheimpact

two

incre鼬eoftheimpacL

to

tli5Pl煳ent,the

fe,nureand

impact

velocityl抽e一,,and

dividedinto

acceleratio“qulcklydeclines

mini岫m

M。reov盯,the

enelgy absorbi“g

pmce…s

phases,aⅡdene。gyisabsorbed

muchfasteriⅡthe6rstphase.An

叩tlmized

impactmalKey

de8ignoftheguardr“ls

thatthe

isalsn

ca而edouIby

consid““g山e删。gy—a1)sorbillg

the“tial

hce,∞ncludi“g

nrie

1)eam

wilhdmthicknes8of1.3mmandthe8P8nofO.665mi8the叩ti-

stnlcture

ofaUselectedguardrails

word8:gLl8rdHjl;impactforc8;ene‘钉-absorbi“gfeatur。;optimizeddesi印;£nite—ekmentmethod

36+6

CLC叫mbeo:U412DocuI眦nt

codo:A

OIntroduction

Inrecen‘years,

mauy

new

concentrateon

the

beam『1一“,

the

post…,thebrac.

ket,t}1e

g【lardrailsystemi引,themedianguardmil【引,

highwayguardmils

Becallse0f

the£ip.beam【“.aswe儿8s曲efransj£ionsfnlc£uT℃and

havebeenusedLheexistence

inpracticalen西need“g.

technolo西es

valjm‘yaIld

cess8工y

to

ofth。guardrail‘引.

to

Butlhere

are

still

0fnexibjl呻andstiI如ess0f

can

the印ard.

som。problems

besolved,forexample,thesafety,

is

ne-

ra订,theimpactenergy

heabsorbedbythedefor—

oplimizedde啦呻0fth。guad商1.It

jnvestigateaIld

to

mation,thusreducingthedamagetovehiclesandthethe

vehicles

bump89ainst

elp嘶memally

tlleoretjcally

jnjury

to

passe“gerswhen

analyze

di雎rent

kinds0fgLIardrails.

on

an

theguardrail

Duri“gtheimpact,theimpactene。gyof

out8preaddefor—

Inthi8paper,based

elperimentaljnvestiga—

thegLlardrailisabsorbedthr0“ght|le

tion,thedynamicre8ponse0fthesemi-rigjdguardr“ls

mationofrippleandthebenddefonnationofLhebeam,andthevelocityofthevehicleisreducedandthemn—ni“gdirectionofthevehicleisforcedhavebee“greatinterestsinthecationofhighw8y

to

subjected

to

impactloadsisanalyzedbymeansofthe

efkctsofthe

thickness.

6njIe—elementmelhod.The

cha“ge.

There

the8panandth。geometricalsizeoft}屺crosssection

on

invest培ationand印pli

The

researches

mainIy

the

ene。盯-absorbi“gfeature

are

alsoconsidered.

theoreti-

to

guardra溉

Duri”gtheelperimentalinvestigationandthecalanalyses,theboundaryconditions

are

s“pposed

Re嘣veddate:June

ence

9.揪

bythePmvincialNatundScl-

be

longitudinal代strictionandpanjaUy

s“pported

hlncks.

}F0unda“帅j蛔啦:S“pp叫ed

Foundatlon0f

cuan出)“g(980577,000482)and1hns-

Cu蚰gdong

ponationBureauof

fhvi㈣

iII

ExperimentalInVestigation

The

瑚ography:Zha0Jiaoian(bomdH忙,main坤reseamhes

dn

1976),Ph

can越

The

elpedmentin啪llation

and

isshownwhh

i11

Fig

1.

con8truchon

en昏neen“g.E—mail:

scaling-down

W-beam印ecimen

ofO

thicknes8

0fthe

i舯615@sina㈣

oflmm

5”n

490misabout】/3

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