


Bigi¶ngMètrôcÇu



1


1.TiªuchuÈnthiÕtkÕ
1.1–TiªuchuÈnthiÕtkÕ. ........................................................................................... 4
1.2–Ph−¬ngph¸ptÝnhto¸nthiÕtkÕ......................................................................... 4
1.3–Ph−¬ngtr×nhtængqu¸tcñaTTGH................................................................... 4
1.4–C¸cTTGHtheo22TCN272–05..................................................................... 6
1.4.1–C¸cTTGHtheotiªuchuÈn22TCN272–05................................................ 6
1.4.2–Tr¹ngth¸igiíih¹nc−êng®é. ....................................................................... 6
1.4.3–Tr¹ngth¸igiíih¹nsödông........................................................................... 6
1.4.4–Tr¹ngth¸igiíih¹nmáiv6®øtg8y. .............................................................. 7
1.4.5–Tr¹ngth¸igiíih¹n®ÆcbiÖt........................................................................... 7
2–NéidungtÝnhto¸nthiÕtkÕ.
2.1–Tr×nhtùtÝnhto¸nthiÕtkÕmètrô. .................................................................... 8
2.2–S¬®åkhèi......................................................................................................... 8
2.3–NéidungtÝnhto¸nthiÕtkÕMècÇu.................................................................. 9

1–SèliÖutÝnhto¸nthiÕtkÕ.
1.1–SèliÖuchung .................................................................................................. 10
1.2–vËtliÖuchÕt¹omè.......................................................................................... 10
1.3–C¸chÖsètÝnhto¸n. ........................................................................................ 11
1.4–§Êt®¾psaumè............................................................................................... 11
1.5–SèliÖuvÒc¸clíp®ÊtnÒn. .............................................................................. 11
2–cÊut¹okÕtcÊunhÞp
2.1–Quym«mÆtc¾tngangcÇu............................................................................. 12
2.2–CÊut¹odÇmchñ............................................................................................. 12
3–KÝchth−íccÊut¹omè.
3.1–Nguyªnt¾cx¸c®Þnhc¸ckÝchth−íccñamè.................................................. 14
3.2–X¸c®Þnhc¸ckÝchth−ícc¬b¶ncñamè......................................................... 15
4–X¸c®Þnht¶iträngt¸cdônglªnmè.
4.1–C¸ct¶iträngt¸cdônglªnmè. ....................................................................... 18
4.2–C¸cmÆtc¾tkiÓmto¸n. ................................................................................... 18
4.3–X¸c®Þnhträngl−îngc¸cbéphËnmè. .......................................................... 19
4.4–X¸c®Þnh¸plùcth¼ng®øngtõkÕtcÊunhÞp................................................... 21



Bigi¶ngMètrôcÇu



2
4.5–X¸c®Þnh¸plùcth¼ng®øngdoho¹tt¶itrªnb¶nqu¸®é................................ 22
4.6–X¸c®Þnh¸plùc®Êtt¸cdônglªnmè.............................................................. 23
4.7–Lùch8mdoho¹tt¶itrªnKCN(BR) .............................................................. 29
4.8–Lùcmas¸tgèicÇu.......................................................................................... 29
4.9–¸plùcgiãt¸cdônglªnmè. ............................................................................ 30
4.9.1–¸plùcgiãngang. ......................................................................................... 30
4.9.2–¸plùcgiãdäc. ............................................................................................. 30
4.9.3–¸plùcgiãth¼ng®øng. ................................................................................. 31
4.9.4–¸plùcgiãt¸cdônglªnxecé....................................................................... 31
4.10–¸plùcn−íct¸cdônglªnmè......................................................................... 32
5–Tæhîpt¶iträng
5.1–HÖsèt¶iträng. ............................................................................................... 33
]HÖsèt¶iträngdïngchoc¸ct¶iträngth−êngxuyªn........................................... 34
5.2–Tænghîpnéilùct¹imÆtc¾t®¸ymãng(mÆtc¾tI–I)................................... 34
5.3–Tænghîpnéilùct¹imÆtc¾tch©nt−êngth©n(mÆtc¾tII–II). ..................... 35
5.4–Tænghîpnéilùct¹imÆtc¾tch©nt−êng®Ønh(mÆtc¾tIII–III). .................. 35
5.5–Tænghîpnéilùct¹imÆtc¾tt−êngc¸nh(mÆtc¾tIV–IV)........................... 36
6–tæhîpt¶iträngbÊtlîi
6.1–Nguyªnt¾cth6nhlËptæhîpt¶iträngbÊtlîi................................................. 37
6.1.1–Nguyªnt¾cchung........................................................................................ 37
6.1.2–Tæhîpt¶iträngIa:BÊtlîiraphÝas«ng...................................................... 37
6.1.3–Tæhîpt¶iträngIb:BÊtlîiv6obê. ............................................................. 37
6.2–Tæhîpt¶iträng®èivíimÆtc¾t®¸ybÖ(MÆtc¾tI]I)..................................... 39
6.3–Tæhîpt¶iträng®èivíimÆtc¾tch©nt−êngth©n(MCII]II) ......................... 41
6.4–Tæhîpt¶iträng®èivíimÆtc¾tch©nt−êng®Ønh(MCIII]III) ...................... 43
7–TÝnhto¸nvbètrÝcètthÐp
7.1–Nguyªnt¾ctÝnhto¸nv6bètrÝcètthÐp. ......................................................... 44
7.2–TÝnhto¸nv6bètrÝcètthÐpmÆtc¾t®¸ymãng(MÆtc¾tI]I)........................ 48
7.3–TÝnhto¸nv6bètrÝcètthÐpmÆtc¾tch©nt−êngth©n(MCII]II).................. 50
7.4–TÝnhto¸nv6bètrÝcètthÐpmÆtc¾tch©nt−êng®Ønh(MCIII]III)............... 52
7.5–TÝnhto¸nv6bètrÝcètthÐpmÆtc¾tt−êngc¸nh(MCIV]IV) ...................... 54
8–TÝnhto¸nvbètrÝcäc
8.1–TÝnhsøcchÞut¶icñacäc................................................................................ 56
8.3–S¬békiÓmto¸nnéilùcdäctrôccäctrongmãng.......................................... 60



Bigi¶ngMètrôcÇu



3
9–KiÓmto¸nmãng.
9.1–X¸c®Þnh®iÒukiÖnkiÓmto¸nmãngcäc........................................................ 61
9.2–KiÓmto¸nbÖcäctheoc¸cTTGHc−êng®é .................................................. 61
9.3–KiÓmto¸nbÖcäctheoc¸cTTGHsödông. ................................................... 64
9.4–KiÓmto¸nnÒnmãngtheoc¸cTTGHc−êng®é............................................. 64
9.5–KiÓmto¸nnÒnmãngtheoc¸cTTGHsödông............................................... 67
10–TÝnhto¸nthic«ng.
10.1–X¸c®Þnhkhèil−îngbªt«ngchÕt¹om«. ..................................................... 68
10.2–Chänbóa®ãngcäc....................................................................................... 68
10.3–TÝnh®échèilýthuyÕtcñacäc ..................................................................... 69
10.4–TÝnhchiÒud6ylípbªt«ngbÞt®¸yhèmãng................................................. 69



Bigi¶ngMètrôcÇu



4
H−íngdÉnthiÕtkÕm«nhäc
ThiÕtkÕMècÇudÇm

1–tiªuchuÈnthiÕtkÕ
1.1–TiªuchuÈnthiÕtkÕ.
]Quytr×nhtÝnhto¸nthiÕtkÕcÇucèngtheoc¸ctr¹ngth¸igiíih¹ndoBéGTVT
banh6nh:
22TCN272]05
1.2–Ph−¬ngph¸ptÝnhto¸nthiÕtkÕ
]Tuúv6oquan®iÓmtÝnhto¸nthiÕtkÕm6cãc¸cph−¬ngph¸ptÝnhto¸nkh¸cnhau
nh−tÝnhtheoøngsuÊtchophÐp,tÝnhtheonéilùcgiíih¹nv6tÝnhtheoc¸cTTGH.
®©ychóngtatÝnhto¸nthiÕtkÕtheo22TCN272–05nªnph−¬ngph¸ptÝnhto¸n
®−îc¸pdôngl6tÝnhto¸ntheoc¸cTTGH:
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+[S
gh
]:Kh¶n¨ngchÞulùcgiíih¹ncñabéphËnkÕtcÊucãxÐt®ÕntÊtc¶c¸c
yÕutèl6mgi¶mkh¶n¨ngchÞulùccñakÕtcÊu.
1.3–Ph−¬ngtr×nhtængqu¸tcñaTTGH.
]Ph−¬ngtr×nhc¬b¶n:
∑
=Φ≤
rniii
RRQ ...
γη
Trong®ã:
+η
i
:HÖsè®iÒuchØnht¶iträngliªnquan®ÕntÝnhdÎov6tÝnhd−còngnh−
tÇmquanträngtrongkhaith¸c.
+γ
i
:HÖsèt¶iträng
+Q
i
:nglùcdot¶iträng
+R
n
:Søckh¸ngdanh®Þnh.
+R
r
:Søckh¸ngtÝnhto¸n.
+φ:HÖsèsøckh¸ng



Bigi¶ngMètrôcÇu



5
]HÖsèsøckh¸ngφ:§èivíimétTTGHn6o®ãth×hÖsèsøckh¸ng®−îcsödông
®ÓxÐt®ÕntÝnhthÊtth−êngtrongtÝnhchÊtcñakÕtcÊu,cñavËtliÖuv6®échÝnhx¸c
cñac¸cph−¬ngtr×nhthiÕtkÕ®¸nhgi¸kh¶n¨ngchÞut¶i,t×nhhuèngh−hángcña
c«ngtr×nh.
]HÖsè®iÒuchØnht¶iträng:η
i
+η
i
=η
D
. η
R
. η
I
≥
0,95®èivíic¸ct¶iträngdïnghÖsèt¶iträngγ
imax
.
+η
i
=
IRD
ηηη
..
1
≤
1,0®èivíic¸ct¶iträngdïnghÖsèt¶iträngγ
imin
.
Trong®ã:
+η
D
:§édÎo: §édÎocñavËtliÖurÊtquanträngcho®éanto6ncñacÇu.NÕu
vËtliÖudÎo,khimétbéphËnchÞulùcqu¸t¶inãsÏph©nbènéilùcsangbé
phËnkh¸c.
1]η
D
≥
1,05choc¸ccÊukiÖnv6liªnkÕtkh«ngdÎo.
2]η
D
=1,0choc¸cthiÕtkÕth«ngth−êng,theo®óng yªucÇucñatiªu
chuÈnthiÕtkÕ.
3]η
D
≥
0,95choc¸ccÊukiÖncãdïngc¸cbiÖnph¸p®Ót¨ngthªmtÝnh
dÎo.
+η
R
:§éd−thõa:§éd−thõacãýnghÜa®èivíigiíih¹nanto6ncñacÇu.Mét
sèkÕtcÊusiªutÜnh®−îccäil6d−thõav×nãcãnhiÒuliªnkÕth¬nsovíiyªu
cÇuc©nb»ngtÜnh®Þnh.HÖcÇucãmét®−îctiÕp®Êt®−îccoil6kh«ngd−thõa
(kh«ngnªndïnglo¹in6y).
Trongtr¹ngth¸igiíih¹nc−êng®é(TTGHc−êng®é).
1]η
R
≥
1,05choc¸cbéphËnkh«ngd−thõa.
2]η
R
=1,0choc¸cmøcd−thõath«ngth−êng.
3]η
R
≥
0,95choc¸cmøcd−thõa®ÆcbiÖt.
+η
I
:§équanträng:
Dungtrongc¸cTTGHc−êng®év6TTGH®ÆcbiÖt.
1]η
I
≥
1,05choc¸ccÇuquanträng.
2]η
I
=1,0choc¸ccÇu®iÓnh×nh.
3]η
I
≥
0,95choc¸ccÇut−¬ng®èiÝtquanträng.