39 +uQKĈӗ thӏ thӇ hiӋQJLiWUӏ moment bұc 2 cӫDWRjQSKә ÿӕi vӟi trөc tung Z0 = TXDFiFOҫn cҳt cӫa dҫPWKpSWҥLNrQK.. +uQKĈӗ thӏ thӇ hiӋQJLiWUӏ moment bұc 2 cӫDWRjQSKә ÿӕi vӟi trөc tung Z0 =
Trang 2&Ð1*75Î1+ĈѬӦ&+2¬17+¬1+7ҤI 75ѬӠ1*ĈҤI HӐ&%È&+.+2$±Ĉ+4*-HCM
&iQEӝ Kѭӟng dүn khoa hӑF*6761J{.LӅu Nhi
TS Phҥm BҧR7RjQ
Trang 3ĈҤI HӐC QUӔC GIA TP.HCM
75ѬӠ1*ĈҤI HӐ&%È&+
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CӜ1*+Ñ$;+ӜI CHӪ 1*+Ƭ$ VIӊT NAM Ĉӝc lұp - Tӵ do - HҥQKSK~F
NHIӊM VӨ LUҰ19Ă1THҤ&6Ƭ
+ӑWrQKӑFYLrQ/r1JӑF9LӉQ MSHV: 1970508 1Jj\WKiQJQăPVLQK 1ѫLVLQK/kPĈӗng
&KX\rQQJjQK&ѫNӻWKXұW 0mVӕ : 8520101
I 7Ç1Ĉӄ 7¬,
Khҧo sit tunh trҥng kӃt cҩu dҫm bҵng moment phә (Damage estimation on beam-like structures using the spectral moment)
II NHIӊM VӨ 9¬1ӜI DUNG:
x KhҧRViWFiFQJKLrQFӭXWURQJQѭӟFYjWKӃ giӟi vӅ FiFÿһFWUѭQJQKұn dҥng sӵ xuӕng cҩp cӫa dҫm cҫu
x ThiӃt kӃ, chӃ tҥRP{KuQKWKtQJKLӋm dҫm chӏu tҧLGLÿӝng
x ĈѭDUDTX\WUuQKWKtQJKLӋm thu nhұn sӕ liӋXGDRÿӝng cӫDP{KuQK
x Xӱ OêVӕ liӋX[k\Gӵng phә F{QJVXҩt
x ĈӅ xuҩWÿһFWUѭQJPRPHQWFӫa phә F{QJVXҩWÿӇ khҧRViWWuQKWUҥng dҫm ӭng vӟi vӃt cҳWYjFҫu thӵc tӃ suy yӃu theo thӡi gian
x ĈiQKJLiNӃt quҧ Yjÿӝ nhҥy cӫDWK{QJVӕ ÿӅ xuҩt
III 1*¬<*,AO NHIӊM VӨ : 22/02/2021
Trang 4LӠI CҦ0Ѫ1
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7S+&0QJj\05 WKiQJ07 QăP
/r1Jӑc ViӉn
Trang 57Ï07ҲT LUҰ19Ă1
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tӃ, luұQYăQWUuQKEj\YLӋc tә chӭFWKtQJKLӋPWUrQGҫm kӃt hӧp vӟi thu thұp sӕ liӋu WUrQNӃt cҩu cҫu thұt, kӃt quҧ FNJQJQKѭQKӳng nhұQ[pWYӅ quan hӋ giӳa ӭng xӱ Fѫhӑc cӫa dҫm hay kӃt cҩu vӟi sӵ WKD\ÿәi moment phә&iFQKұQ[pWQj\FyêQJKƭDcho viӋF[k\GӵQJP{KuQKWRiQVDXQj\QKҵm phөc vө FKRF{QJWiFGӵ EiR
ABSTRACT
This thesis experimentally studies on the relationship between mechanic responses and parameters that effected on the reduction of load bearing capacity of beams The parameter selected to characterize the evaluation is the torque of the oscillating power spectrum The results show that the reduction of load bearing capacity of beams is depended on cracks of the structures For comparing between experiment beam and actual structure, the study not only states the combining experiment and actual VWUXFWXUH¶VUesponses monitoring but also figures out the results then comments about spectrum's moment with respect to the dynamic behaviors of structure These comments are significantly useful for future research to monitor structural health
Trang 6LӠ,&$0Ĉ2$1
7{L[LQFDPÿRDQOXұQYăQQj\OjGRFKtQKW{LWKӵc hiӋQ&iFVӕ liӋXWK{QJWLQWjLliӋXWUtFKGүQÿѭӧc sӱ dөng trong luұQYăQÿӅu trung thӵFFyWUtFKGүQU}UjQJYjluұQYăQFKӍ ÿѭӧc nӝp tҥL7UѭӡQJĈҥi hӑF%iFK.KRD73+ӗ &Kt0LQK
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Trang 7Mөc lөc
'DQKViFKbҧng iii
'DQKViFKKuQKҧnh iii
&+ѬѪ1* TӘNG QUAN 1
9DLWUzYjWҫm quan trӑng cӫa kӃt cҩXFѫVӣ hҥ tҫQJWURQJÿӡi sӕQJ[mKӝi 1
&iFELӋQSKiSJLiPViWWuQKWUҥng kӃt cҩu 4
1.2.1 BiӋQSKiSNLӇm tra cөc bӝ 4
1.2.2 BiӋQSKiSNLӇm tra tәng thӇ 6
3KkQORҥLFiFSKѭѫQJSKiSQKұn dҥQJKѭKӓng bҵng VBDI 8
1.4 Mӝt sӕ F{QJWUuQKQJKLrQFӭu trong vҩQÿӅ nhұn dҥQJKѭKӓng kӃt cҩu bҵng WtQKLӋXGDRÿӝng 9
1.5 Giӟi thiӋXÿӅ WjLOXұQYăQ 12
/êGRFKӑQÿӅ WjL 12
1.5.2 MөFWLrXÿӕLWѭӧQJYjQӝLGXQJQJKLrQFӭu 12
&+ѬѪ1* &Ѫ6Ӣ /é7+8<ӂT 14
3KpSELӃQÿәi Fourier 14
2.2 ThiӃt lұp phә GDRÿӝng 16
+jPÿiSӭng tҫn sӕ 18
2.4 Moment cӫa phә 20
'DRÿӝng cӫa dҫm 22
&+ѬѪ1* 7+Ë1*+,ӊ09¬7+87+ҰP SӔ LIӊU 24
3.1 Thu thұp sӕ liӋXWUrQP{KuQKQKӏp cҫu 24
0{KuQKWKtQJKLӋm 24
3.1.2 TiӃQKjQKWKtQJKLӋPYjWKXQKұn sӕ liӋu 29
3.2 Thu thұp sӕ liӋXWUrQQKӏp cҫX6jL*zQ 30
&+ѬѪ1* KӂT QUҦ ĈҤ7ĈѬӦC 33
4.1 KӃt quҧ cho dҫPWKpS 37
4.1.1 Moment cӫDWRjQSKә 38
4.1.2 Moment cho phә ÿѭӧFFKLDWKHRYQJ 46
4.2 KӃt quҧ cho nhӏp cҫX6jL*zQ 63
0RPHQWFKRWRjQSKә 63
Trang 84.2.2 Moment cho phә ÿѭӧFFKLDWKHRYQJ 70
&+ѬѪ1* KӂT LUҰ19¬+ѬӞ1*3+È775,ӆN 77
7yPWҳt kӃt quҧ WKXÿѭӧc 77
5.2 NhұQ[pWYjNӃt luұn 77
+ѭӟQJSKiWWULӇn 80
Lӡi cҧPѫQ 81
7jLOLӋu tham khҧo 82
Trang 9'DQKViFKbҧng
BҧQJ7K{QJVӕ vӃt cҳt cӫa dҫPWKpS 25
BҧQJ7K{QJVӕ cӫDP{KuQKWKtQJKLӋm 26
Bҧng 3.3: Quan hӋ giӳa vұn tӕc cӫa tҧi thӵFYjWҧLGLÿӝQJWURQJWKtQJKLӋm 26
Bҧng 4.1: Bҧng biӇu tәng kӃWKuQKҧnh kӃt quҧ WKXÿѭӧFNKLVRViQKEҵQJJLiWUӏ SM 36
Bҧng 4.2: Bҧng biӇu tәng kӃWKuQKҧnh kӃt quҧ WKXÿѭӧFNKLVRViQKEҵQJJLiWUӏ G 37
Bҧng 4.3: Bҧng biӇu tәng kӃWKuQKҧnh kӃt quҧ WKXÿѭӧFNKLVRViQKEҵQJJLiWUӏ r. 37
'DQKViFKKuQKҧnh +uQKĈѭӡng bӝ JLDRWK{QJӣ 7KjQKSKӕ Hӗ &Kt0LQK>@ 1
+uQK7X\ӃQÿѭӡng sҳWÿ{WKӏ ÿDQJÿѭӧF[k\Gӵng ӣ 7KjQKSKӕ Hӗ &Kt0LQK>@ 2
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+uQK&ҫu Koi ± Vӏnh Hҥ Long, TӍnh Quҧng Ninh [4] 3
+uQK&ҫu RӗQJ7KjQKSKӕ Ĉj1ҹng [5] 3
+uQK%LӇXÿӗ SKkQORҥLFiFSKѭѫQJSKiSNLӇPWUDWuQKWUҥng kӃt cҩXWKHRWiFJLҧ Ramos [6] 4
+uQK3KѭѫQJSKiSNLӇm tra thӫ F{QJEҵQJFiFKTXDQViWKѭKӓng 5
+uQK3KѭѫQJSKiSNLӇm tra kӃt cҩu bҵng kӻ thuұWVLrXkP 6
+uQK0LQKKӑa hӋ thӕng theo G}LVӭc khӓe (SHM) cӫa mӝWFk\Fҫu 8
+uQK0{KuQKPLQKKӑa dҫm chӏXWiFGөng tҧi di chuyӇn 13
+uQKĈӝ rӝQJ[XQJKuQKFKӳ nhұt 15
+uQK3KpSELӃQÿәi Fourier 16
+uQK7tQKWRiQWӵ WѭѫQJTXDQ>@ 18
+uQK0ӕi quan hӋ giӳDQJ}YjRYjQJ}UDFӫDFѫKӋ tuyӃQWtQK>@ 19
+uQK0LQKKӑa tҫn sӕ WUXQJWkPFӫa phә 21
+uQK%LӇXÿӗ FiFWKӵc nghiӋm thu thұp dӳ liӋu 24
+uQK0{KuQKWKtQJKLӋm cho dҫPWKpS 24
Trang 10+uQK0{Wҧ KuQKGҥQJYjYӏ WUtYӃt cҳWWUrQGҫPWKpSWKHRKuQKFKLӅu bҵng cӫa
P{KuQKWKtQJKLӋm 25
+uQK0{KuQKWKӵc tӃ P{Wҧ dҫPWKpSWӵDKDLÿҫu 27
+uQK0{KuQKWҧi di chuyӇQWUrQGҫPWKpS 27
+uQK0i\ELӃn tҫQJL~SWҧi chuyӇQÿӝng 27
+uQKCҧm biӃQÿRJLDWӕc 28
+uQKĈҫXWKXWtQKLӋu cӫa cҧm biӃn gia tӕc 28
+uQK0i\WtQKWKXQKұn dӳ liӋXGDRÿӝng 28
+uQK7KtQJKLӋPÿRGDRÿӝQJWUrQGҫm 29
+uQK6ѫÿӗ TXiWUuQKWLӃQKjQKWKtQJKLӋPWUrQGҫm 29
+uQK6ѫÿӗ biӇu thӏ TXiWUuQKWKXGӳ liӋu trong mӝt lҫn cҳt 30
+uQK&ҧm biӃQÿRJLDWӕc ӣ QJRjLFҫu thӵc tӃ 30
+uQK6ѫÿӗ thӇ hiӋn thӡLJLDQYjQKӏp cҫu lҩ\WtQKLӋXGDRÿӝng 31
+uQK&{QJWiFÿRGDRÿӝng thӵc tӃ cҫX6jL*zQ 31
+uQK6ѫÿӗ biӇu thӏ TXiWUuQKWKXGӳ liӋXWUrQPӝt nhӏp cҫu 32
+uQK6ѫÿӗ chuyӇQÿәLWtQKLӋu dao ÿӝng sang phә F{QJVXҩt 33
+uQK6ѫÿӗ KDLKѭӟQJFKtQKÿӇ WtQKPRPHQWFKRSKә 34
+uQK0{Wҧ cho hai dҥng sӱ dөng phә NKiFQKDX 35
+uQK6ѫÿӗ WyPWҳWTX\WUuQK[ӱ OêYjVRViQKNӃt quҧ 36
+uQK0{KuQKWKӇ hiӋn vӃt cҳWYjYӏ WUtFҧm biӃQWUrQGҫm 37
+uQKĈӗ thӏ phә F{QJVXҩWTXDFiFOҫn cҳWNKiFQKDX6oS9) tҥLNrQK 38
+uQKĈӗ thӏ phә F{QJVXҩWTXDFiFOҫn cҳWNKiFQKDX6oS9) tҥLNrQK 38
+uQKĈӗ thӏ phә F{QJVXҩWTXDFiFOҫn cҳWNKiFQKDX6oS9) tҥLNrQK 39
+uQKĈӗ thӏ phә F{QJVXҩWTXDFiFOҫn cҳWNKiFQKDX6oS9) tҥLNrQK 39
+uQKĈӗ thӏ thӇ hiӋQJLiWUӏ moment bұc 2 cӫDWRjQSKә ÿӕi vӟi trөc tung (Z0 = TXDFiFOҫn cҳt cӫa dҫPWKpSWҥLNrQK Fӫa dҫPWKpS 40
Trang 11+uQKĈӗ thӏ thӇ hiӋQJLiWUӏ moment bұc 2 cӫDWRjQSKә ÿӕi vӟi trөc tung (Z0 =
TXDFiFOҫn cҳt cӫa dҫPWKpSWҥLNrQK Fӫa dҫPWKpS 40
+uQKĈӗ thӏ thӇ hiӋQJLiWUӏ moment bұc 2 cӫDWRjQSKә ÿӕi vӟi trөc tung (Z0 = TXDFiFOҫn cҳt cӫa dҫPWKpSWҥLNrQK