架空輸電線路設(shè)計(jì)-孟遂民版--答案

1、第二章第二章4.求[例22]中沈陽地區(qū)50年一遇的30m高度的最大設(shè)計(jì)風(fēng)速是多少？【解】（1）計(jì)算樣本中的48個(gè)年最大風(fēng)速的均值和標(biāo)準(zhǔn)差S分別為：?)(9375.184890911smvnnii??????)(3402.41483525.885)(1112smvvnSnii????????（2）進(jìn)行重現(xiàn)期的概率計(jì)算，由于風(fēng)速個(gè)數(shù)，查表27并進(jìn)行線性插值，得到修正系數(shù)C1、C2為：48?n15714.1)4548(455015185.11

2、6066.115185.11???????C54764.0)4548(455054630.054853.054630.02???????C分布的尺度參數(shù)a和位置參數(shù)b為：1)(26661.03402.415714.11????smSCa)(8834.1626661.054764.09375.182smaCvb?????重現(xiàn)期R=50年20m高度的年最大風(fēng)速為：)(519.31)15050ln(ln2661.018834.16)1ln(l

3、n150smRRabv???????????????????（3）進(jìn)行高度換算，B類地區(qū)，故，則0.116.0???z067025.1)2030(0.1)(16.0????zhh儀設(shè)計(jì)??所以，30m設(shè)計(jì)高度處50年重現(xiàn)期的年最大風(fēng)速為：)(632.33519.31067025.15050smvvm?????（1）自重比載為????mMPAqga333110487.361062.1818.92.6761000???????????（2）

4、冰重比載為????mMPaAdbb333210984.411062.181)5.1710(10728.2710)(728.27010??????????????（3）垂直總比載為????????mMPa321310471.7801000010????????（4）無冰風(fēng)壓比載應(yīng)計(jì)算最大風(fēng)速和安裝有風(fēng)兩種情況。因，則；只計(jì)算導(dǎo)線時(shí)，，所mmmmd175.17??1.1?sc?0.1?c?以：①最大風(fēng)速時(shí)，基本風(fēng)壓為sm30????aPw5

5、.56230625.0625.02230?????查表38的得計(jì)算強(qiáng)度時(shí)的，所以75.0?f?????mMPAwdfc333230410715.441062.1815.5625.171.175.00.110sin300??????????????????計(jì)算風(fēng)偏（校驗(yàn)電氣間隙）時(shí)，，所以61.0?f?????mMPAwdfc333230410368.361062.1815.5625.171.161.00.110sin300???????

6、???????????②安裝風(fēng)速時(shí)，查表38得，則sm10??0.1?f???aPw5.6210625.0625.02210?????????mMPAwdfc333210410624.61062.1815.625.171.10.10.110sin100???????????????????（5）覆冰風(fēng)壓比載。因?yàn)椋畹糜?jì)算強(qiáng)度和鳳偏時(shí)均有，取，，所以sm10??0.1?f?1.1?sc???aPw5.6210?????mMPAwbdac

7、sf333210510195.141062.1815.62)1025.17(1.10.110sin)2(1010??????????????????（6）無冰綜合比載最大風(fēng)速（計(jì)算強(qiáng)度）時(shí)有最大風(fēng)速（計(jì)算風(fēng)偏）時(shí)有????????mMPa33222421610712.5710715.44487.3630000300????????????安裝有風(fēng)時(shí)有????????mMPa33222421610516.5110368.36487.363