thuyet minh tai trong

Thuyet minh tinh toan ket cau

THUYET MINHTHUYT MINH TNH TON KT CUHNG MC: KHU PH THNG MI V CH HI TNI. Nhng ti liu, tiu chun s dng trong thuyt minh:1. Tiu chun ti trng v tc ng TCVN 2737 - 19952. Tiu chun thit k kt cu b tng v b tng ct thp TCVN 356 - 20053. Tiu chun thit k mng cc TCVN 205 - 19984. Cu to b tng ct thp - NXB B Xy Dng.5. H s thit k Kin trc6. Bo co kho st a cht cng trnh.II. Gii php kt cu v vt liu s dng.II.1. Tng quan v cng trnh v gii php kt cu:Cng trnh c kch thc hnh hc theo mt bng l: 25,5x35m. Gm 7 tng vi chiu cao l: 27,4 m. Chc nng s dng ch yu l vn phng, phng hp, v khu dch v.Da vo c im v kin trc, c im v ti trng v iu kin xy dng. Ta la chn kt cu b tng ton khi cho cng trnh. Vi h thng chu lc bao gm: vch, ct, dm v sn. Vch c t kt hp lm thnh hc thang my. H thng dm ph c b sung chia nh sn.Cng trnh c xy dng trn nn t kh yu, trong khi ti trng ca cng trnh l kh ln, nn ta s dng phng n mng cc lm mng cho cng trnh.II.2. Vt liu s dng.S dng b tng cp B20 (M250) i vi sn, dm, ct, i cc v ging mng- B tng M200:Cng chu nn: Rb = 90 kG/cm2Cng chu ko: Rbt = 7,5 kG/cm2- B tng M250:Cng chu nn: Rb = 115 kG/cm2Cng chu ko: Rbt = 8,8 kG/cm2- B tng M300:Cng chu nn: Rb = 130 kG/cm2Cng chu ko: Rbt = 10 kG/cm2- Ct thpCt thp chu lc, f >= 10: Thp CII. Cng Rs = 280 Mpa (2800 kG/cm2)Ct thp ai, f < 10: Thp CI. Cng Rs = 225 Mpa (2250 kG/cm2)- Chiu dy lp b tng bo v ct thp quy nh cho tng loi cu kin nh sau:Mng: ao = 4 cmCt, dm: ao = 2,5 cmSn: ao = 1,5 cmIII. M hnh tnh ton.Da vo ti trng v nhp ca cc cu kin, ta la chn kch thc cc cu kin nh sau:- Vch: dy 220- Ct, tu vo din chu ti m c cc kch thc: 550x550; 440x440; v ct D600.- Dm: tu theo nhp m c cc kch thc: 300x600, 220x500, v 220x350IV. Xc nh ti trng.IV.1. Ti trng thng xuyn.Ti trng thng xuyn bao gm trng lng bn thn cc cu kin v cc chi tit kin trc. Trng lng bn thn vch, ct, dm, v sn c tnh ton t ng trong chng trnh phn tch kt cu. Trong bng di dy ch k n trng lng khi xy, cc lp trt v chi tit kin trc.IV.1.a. Ti trng cu thang b.STTTn ti trngChiu dy (m)TL ring (kG/m3)TT tiu chun (kG/m2)H s vt tiTT Tnh ton (kG/m2)1Mt bc bng Granit0.011800181.119.82Va lt0.0151600241.331.23Bc thang xy gch0.06517001111.1121.64Bn b tng0.125002501.12755Va trt0.0151600241.331.2Tng ti trng (kG/m2)479Ti trng ny c phn b ln cn thang, dm thang, tng k v vch thang my. Gn ng, ta coi n phn b ln hai dm thang chiu ti v chiu ngh. Ti trng phn b ln cc dm ny l:q =479x1=479kG/mIV.1.b. Ti trng sn S1(khu vn phng, phng hp)STTTn ti trngChiu dy (m)TL ring (kG/m3)TT tiu chun (kG/m2)H s vt tiTT Tnh ton (kG/m2)1Lt gch Granit (Ceramic)0.011800181.119.82Va lt0.0151600241.331.23Va trt0.0151600241.331.2Tng ti trng (kG/m2)82Ti trng ny c phn b trn cc sn theo phng tc dng.IV.1.c. Ti trng sn S2 (khu v sinh)STTTn ti trngChiu dy (m)TL ring (kG/m3)TT tiu chun (kG/m2)H s vt tiTT Tnh ton (kG/m2)1Lt gch Granit (Ceramic)0.011800181.119.82Va lt0.0151600241.331.23Va trt0.0151600241.331.24Lp trn gi Vilaboar chng nc401.352Tng ti trng (kG/m2)134Ti trng ny c phn b trn cc sn theo phng tc dng.IV.1.d. Ti trng sn M1 (mi)STTTn ti trngChiu dy (m)TL ring (kG/m3)TT tiu chun (kG/m2)H s vt tiTT Tnh ton (kG/m2)1Lt ngi0.011800181.119.82Va lt0.0151600241.331.23Gch 6 l0.212002401.33125Va trt0.0151600241.331.2Tng ti trng (kG/m2)394IV.1.e. Ti trng tng xy 220 cao:3.6m, h s ca:0.7STTTn ti trngChiu dy (m)TL ring (kG/m3)TT tiu chun (kG/m2)H s vt tiTT Tnh ton (kG/m2)1Gch xy0.2200010081.11108.82Va trt0.02160080.641.3105Tng ti trng (kG/m)1214Ti trng ny c phn b trn cc dm theo phng tc dng.IV.2. Ti trng tm thi.IV.2.a. Hot ti s dng.Theo tiu chun TCVN 2737 - 1995Mc ch s dngTi trng tiu chun (kG/m2)H s vt tiTi trng tnh ton (kG/m2)Vn phng2001.2240Phng hp5001.2600Kho4801.2576Phng v sinh1501.3195Hnh lang, cu thang3001.2360Mi b tng khng c ngi s dng751.397.5Ti trng cu thang c phn b ln cn thang, dm thang, tng k v vch thang my. Gn ng, ta coi n phn b ln hai dm thang chiu ti v chiu ngh. Ti trng phn b ln cc dm ny l:q =360x1=360kG/mIV.2.b. Ti trng gi.Ti trng gi c quy v cc mc sn vi gi tr xc nh theo din chu ti.Gi tr tiu chun thnh phn tnh ca p lc gi Wj ti im j ng vi cao zj so vi mc chun xc nh theo cng thc:Wj = Wo.kzj.cc - H s kh ng, khng th nguyn.Wo - Gi tr ca p lc gi tiu chun, daN/m2.kzj - H s cao, khng th nguyn.Ti trng tc dng ln tng mc sn, n v daN, c xc nh theo cng thc:wj = g.Wj.hg - H s vt ti ca ti trng gi, g =1.2h - Chiu cao n gi ca tng sn.Cng trnh c xy dng a im: thnh ph Thi Bnh, tnh Thi Bnh.vng p lc gi:IIIc Wo (daN/m2) =125v dng a hnhBSnCt cao hH s kGi yGi htc =0.8c =0.6Sn tng 24.34.20.852429322Sn tng 350.70.8807455Sn tng 47.42.40.938270203Sn tng 512.451.038623467Sn tng 615.73.31.087430323Sn tng 7193.31.120444333Sn tng tum22.63.61.153498374Mi25.93.31.183469351V. Cc trng hp ti trng v t hp ti trng.Trong qu trnh tnh ton, cc ti trng trn c phn ra lm 6 loi ti trng k hiu nh sau:1. TT: Tnh ti.2. HT: Hot ti s dng.3. GX1: Gi theo phng X t tri sang.4. GX2: Gi theo phng X t phi sang.5. GY1: Gi theo phng Y t trc ra sau.6. GY2: Gi theo phng Y t sau ra trc.T khai bo cc t hp ti trng nh sau:TTHTGX1GX2GY1GY2TH1110000TH210.90.9000TH310.900.900TH410.9000.90TH510.90000.9Kt qu tnh ton ni lc, trng hp t hp nguy him v din tch ct thp tng ng c th hin trong cc bng tnh ton cu kin km theo.

Ph lc GIVng giWoZABCI65310.80.47II9551.070.880.54III125101.1810.66IV155151.241.080.74V185201.291.130.8301.371.220.89401.431.280.97501.471.341.03601.511.381.08801.571.451.18