V 1/ la cac ma Iran dudne eheo
2.6.1. Thong sd cau tao cau day vang
Tfnh loan vf du vdi mot cau day vang cd cac thong sd ket cáu sau: (hinh 2.6) - Ket cau cau day vang 3 nhip đi xung, phan bd nhip:L=40.4+97+40.5=178m
Dam cung dang dam ban BTCT, chi6u eao tren tiet dien dam bien thien h=35cm-55em, chi6u rgng mat cau xe chay 12.5m, chieu rgng loan bg la B=14.5m, chieu rgng treo cap 13.4m.
Cot thap BTCT hinh ehu H, chi6u eao loan bg 34.5m. Cap vang diing loai bd tao 7 sgi, cd 2 loai bd cap vang loai 12 bd T15.2 va 19 bd T15.2
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B - B
Hinh 2.d. So do va eau tao eae bd phan eau day vang
- Trgng Iirgng loan bg cac tai trgng dai han tren dam (dam eirng. dam ngang, lop mat eau, khdi neo, lan ean. lay vin...) la 19.8 Uin/lm ehieii dai dam.
Cac dae irirng vai lieu, hinh hoe eiia dam eírng . cot ihap \a eae da> vang dugc mh toan iriMie bane 2.1.
Bang 2.1. Cac dae trung hinh hoc ciia dam cung, cot thap va cac day vans Dam cuns
1. Due trung vat lien
E =3600000 T/m- G =1384600 T/m- M =0.3
2. Ddc trioii^ hinh hoc
A =6.525 m-' 133=0.11 m' I,, =114.32 m' J =0.44m' Cot thap Ị Dgc trirng vdt lieu E =3600000 T/m- G =1384600 T/m- [i=0.3
2. Dgc trung hinh hoc
Dinh va than cot thap A=1.14m-;l3,=0.257m' l22=0.118m-*;J=0.223m' Chan cot thap
A = 1 . 1 4 m - ; I , , = 0 . 2 5 7 m ' I,, =0.118m^;J=0.223m^ Dav vans /. Dgc trung vgt lieu E= 19500000 T/m- 2. Dgc tnmg hinh hgc Day vang 19K15 A =26.355 cm- Day vang 12K15 Â=16.69cm-