【正文】 1節(jié)點(diǎn)：彎矩= 軸力=28700KN2節(jié)點(diǎn)：彎矩= 軸力=28706KN1. =*295/*=2. =1000(1++)= 3.= 18230/49380= =+*+*^2== =*==*== =1 4.=49380/28706= = =5. 1節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**==28700KN1節(jié)點(diǎn)處局部承載力滿足要求（2）20節(jié)點(diǎn)處：20節(jié)點(diǎn)：彎矩= 軸力=20340KN19節(jié)點(diǎn)：彎矩= 軸力=22510KN1. =*295/*=2. =1000(1++)= 3.=+*+*^2== =*==*== =1 4. =1375/22510= = =1/(1+*)=5. 20節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=N=20340KN*Ag*f=**295*1000=21節(jié) 點(diǎn)處局部承載力滿足要求（3）39節(jié)點(diǎn)處：38節(jié)點(diǎn)：彎矩= 軸力=66950KN39節(jié)點(diǎn)：彎矩= 軸力=72040KN1.=*295/*=2.=1000(1++)=3.=4760/5288= =+*+*^2== =*==*== =14.=5288/72040= = =1/(1+*)=5. 39節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**= 7204039節(jié)點(diǎn)處局部承載力滿足要求（4）58節(jié)點(diǎn)處：58節(jié)點(diǎn)：彎矩= 軸力=16680KN59節(jié)點(diǎn)：彎矩= 軸力=25350KN1.=*295/*=2.=1000(1++)=3.=1166/2006= =+*+*^2== =*==*== =1 4.=2006/16680= = =1/(1+*)=5. 58節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=1668058節(jié)點(diǎn)處局部承載力滿足要求（5）77節(jié)點(diǎn)處：76節(jié)點(diǎn)：彎矩= 軸力=16450KN77節(jié)點(diǎn)：彎矩= 軸力=16440KN1.=*295/*=2.=1000(1++)=3.=12500/28180= =+*+*^2== =*==*== =1 4.=28180/16450= = =5. 77節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=215321644077節(jié)點(diǎn)處局部承載力滿足要求（6）78節(jié)點(diǎn)處：78節(jié)點(diǎn)：彎矩= 軸力=11640KN79節(jié)點(diǎn)：彎矩= 軸力=64130KN1. =*295/*=2. =1000(1++)= 3.=16480/70350= =+*+*^2== =*==*== =1 4. =70350/64130= = =5. 78節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=N=11640KN*Ag*f=**295*1000= 78節(jié)點(diǎn)處局部承載力滿足要求（7）97節(jié)點(diǎn)處：96節(jié)點(diǎn)：彎矩= 軸力=39560KN97節(jié)點(diǎn)：彎矩= 軸力=39470KN1. =*295/*=2. =1000(1++)= 3.=1779/2124= =+*+*^2== =*= =*= = =1 4. =2124/39560= = =1/(1+*)=5. 97節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=15958039470 97節(jié)點(diǎn)處局部承載力滿足要求（8）116節(jié)點(diǎn)處：115節(jié)點(diǎn)：彎矩= 軸力=54190KN116節(jié)點(diǎn)：彎矩= 軸力=45130KN1. =*295/*=2. =1000(1++)= 3.=4674/5313= =+*+*^2== =*= =*= = =1 4. =5313/45130= = =1/(1+*)=5. 116節(jié)點(diǎn)處的承載力設(shè)計(jì)值為 =1**= N=45130KN*Ag*f=**295*1000= 116節(jié)點(diǎn)點(diǎn)處局部承載力滿足要求（9）135節(jié)點(diǎn)處：135節(jié)點(diǎn)：彎矩= 軸力=972KN136節(jié)點(diǎn)：彎矩= 軸力=7806KN1. =*295/*=2. =1000(1++)= 3. =+*+*^2= = =*= =*= = =1 4. =2236/972= = =5. 135節(jié)點(diǎn)處的承載力設(shè)計(jì)值為 =1**= N=972KN*Ag*f=**295*1000= 135節(jié)點(diǎn)點(diǎn)處局部承載力滿足要求（10）154節(jié)點(diǎn)處：153節(jié)點(diǎn)：彎矩= 軸力=21440KN154節(jié)點(diǎn)：彎矩= 軸力=22310KN1. =*295/*=2. =1000(1++)= 3. =11210/42630= =+*+*^2= = =*= =*= = =1 4. =42630/21440= = =5. 154節(jié)點(diǎn)處的承載力設(shè)計(jì)值為 =1**= 22310155節(jié) 點(diǎn)點(diǎn)處局部承載力滿足要求整體承載力驗(yàn)算：（1）=*2= *= M1=18230+16480=34710 M2=12500+11210=23710 N1=28700+11640=40340kN N2=16440+22310=38750kN= 23710/34710 =所以=+ +*^2==*=（2）=(+^2*)*2==2*(+*)==*(^^2)/cos(40)====（5） =+(1+)==34710/40340===1/(1+2*)=（4）=2*=（5） 整體承載力設(shè)計(jì)值=**== =40340kN 基本組合下整體承載力滿足要求。（II）以最小負(fù)彎矩組合時(shí)，最不利位置在20,97節(jié)點(diǎn)處（1）20節(jié)點(diǎn)處： 19節(jié)點(diǎn)：彎矩=2022kN .M 軸力=23920KN 20節(jié)點(diǎn)：彎矩= .M 軸力=16230KN1. =*295/*=2. =1000(1++)= 3. = =+*+*^2= = =*= =*= = =1 4. =2022/23920= = =1/(1+*)=5. 20節(jié)點(diǎn)處的承載力設(shè)計(jì)值為 =1**= N=23920KN*Ag*f=**295*1000= 20節(jié)點(diǎn)處局部承載力滿足要求（2）97節(jié)點(diǎn)處： 96節(jié)點(diǎn)：彎矩=2633kN .M 軸力=51980KN 97節(jié)點(diǎn)：彎矩= .M 軸力=51990KN1. =*295/*=2. =1000(1++)= 3. =+*+*^2= = =*= =*= = =1 4. =2633/51980= = =1/(1+*)=5. 97節(jié)點(diǎn)處的承載力設(shè)計(jì)值=1**=161297 51990 97節(jié)點(diǎn)處局部承載力滿足要求 所以在驗(yàn)算節(jié)點(diǎn)處局部承載力是否滿足要求時(shí)，同時(shí)取同桿件上的另一個(gè)點(diǎn)在最不利狀態(tài)下的組合，比單獨(dú)節(jié)點(diǎn)最不利時(shí)更保守（例如取的是20節(jié)點(diǎn)和19節(jié)點(diǎn)同時(shí)在最不利狀態(tài)的組合，這比20節(jié)點(diǎn)最不利時(shí)，19節(jié)點(diǎn)沒(méi)達(dá)到最不利時(shí)更保守）因?yàn)樽畲筘?fù)彎矩組合時(shí)，各節(jié)點(diǎn)中，20,97節(jié)點(diǎn)是最不利的，結(jié)合對(duì)最大正彎矩組合的驗(yàn)算，可以推得最不利節(jié)點(diǎn)20,97節(jié)點(diǎn)局部承載力滿足要求，所以可得其它節(jié)點(diǎn)1節(jié)點(diǎn)、39節(jié)點(diǎn)、58節(jié)點(diǎn)、77節(jié)點(diǎn)、78節(jié)點(diǎn),116節(jié)點(diǎn),135節(jié)點(diǎn),154節(jié)點(diǎn)局部承載力也應(yīng)該滿足要求。整體承載力驗(yàn)算：（1）=*2= *= M1=15730+14200=29930 M2=85740+79430=165170 N1=2870062920 =34220kN N2=11430+45890=57320kN= 29930/165170 =所以=+ +*^2==*=（2）=(+^2*)*2==2*(+*)==*(^^2)/cos(40)====（6） =+(1+)==165170/57320===1/(1+2*)=（4）=2*=（5） 整體承載力設(shè)計(jì)值=**== =34220kN 基本組合下整體承載力滿足要求。C: 以長(zhǎng)期效應(yīng)組合進(jìn)行（用于正常使用極限狀態(tài)）驗(yàn)算時(shí)：最大正彎矩組合下局部承載力時(shí)：（1）1節(jié)點(diǎn)處：1節(jié)點(diǎn)：彎矩= 軸力=28750KN2節(jié)點(diǎn)：彎矩= 軸力=28750KN1. =*295/*=2. =1000(1++)= 3.= 18250/49410= =+*+*^2== =*==*== =1 4.=49410/28750= = =5. 1節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**==28750KN1節(jié)點(diǎn)處局部承載力滿足要求（2）20節(jié)點(diǎn)處：20節(jié)點(diǎn)：彎矩= 軸力=18910KN19節(jié)點(diǎn)：彎矩= 軸力=11260KN1. =*295/*=2. =1000(1++)= 3.=+*+*^2== =*==*== =1 4. =1157/11260= m = =1/(1+*)=5. 20節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=N=18910KN*Ag*f=**295*1000=22節(jié) 點(diǎn)處局部承載力滿足要求（3）39節(jié)點(diǎn)處：38節(jié)點(diǎn)：彎矩= 軸力=68230KN39節(jié)點(diǎn)：彎矩= 軸力=73260KN1.=*295/*=2.=1000(1++)=3.=4891/5509= =+*+*^2== =*==*== =14.=5509/73260= = =1/(1+*)=5. 39節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**= 7326039節(jié)點(diǎn)處局部承載力滿足要求（4）58節(jié)點(diǎn)處：58節(jié)點(diǎn)：彎矩= 軸力=18130KN59節(jié)點(diǎn)：彎矩= 軸力=26630KN1.=*295/*=2.=1000(1++)=3.=1384/2148= =+*+*^2== =*==*== =1 4.=2148/18130= = =1/(1+*)=5. 58節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=1322791813058節(jié)點(diǎn)處局部承載力滿足要求（5）77節(jié)點(diǎn)處：76節(jié)點(diǎn)：彎矩= 軸力=16550KN77節(jié)點(diǎn)：彎矩= 軸力=16510KN1.=*295/*=2.=1000(1++)=3.=12520/28240= =+*+*^2== =*==*== =1 4.=28240/16550= = =5. 77節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=1651077節(jié)點(diǎn)處局部承載力滿足要求 （6）78節(jié)點(diǎn)處：78節(jié)點(diǎn)：彎矩= 軸力=60060KN79節(jié)點(diǎn)：彎矩= 軸力=64000KN1. =*295/*=2. =1000(1++)= 3.=16500/70380= =+*+*^2== =*==*== =1 4. =70380/64000= = =5. 78節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=N=60060KN*Ag*f=**295*1000= 78節(jié)點(diǎn)處局部承載力滿足要求（7）97節(jié)點(diǎn)處：96節(jié)點(diǎn)：彎矩= 軸力=38600KN97節(jié)點(diǎn)：彎矩= 軸力=38480KN1. =*295/*=2. =1000(1++)= 3.=360/1954= =+*+*^2== =*= =*= = =1 4. =1954/38600= = =1/(1+*)=5. 97節(jié)點(diǎn)處的承載力設(shè)計(jì)值為=1**=38480 97節(jié)點(diǎn)處局部承載力滿足要求（8）116節(jié)點(diǎn)處：115節(jié)點(diǎn)：彎矩= 軸力=54780KN116節(jié)點(diǎn)：彎矩= 軸力=45770KN1. =*295/*=2. =1000(1++)= 3.=4887/5524= =+*+*^2== =*= =*=