000 þì X 11 ü?ì0.488üí?ý?T1 = 0.358s?í ý?ì X 21 ü ì- 1.710üT2 = 0.156sT1 = 0.1sm~ Tg 时,a?=a?max ;要求:用底部剪力法计算结构在多遇地震作用下各层的层间地震剪力2?Vi 。提示:a?= ççö÷÷a?maxk2?m1 4m?T1 = Tg ~5 Tg 时,?æ Tgè T1?ø?0.9?;k1?4m?T1 > 1.4Tg?且?Tg < 0.35?s时,d n = 0.08T1 + 0.07 ;Tg = 0.35 ~ 0.55?s时,dn = 0.08T1 + 0.01æ T ö ?æ 0.25 öa?1 = ç?g ÷a?max = ç ?÷?´ 0.16=0.116解:?Tg < T1 = 0.358s<5Tg?,?è T1 ø è 0.358 ø?0.9 0.9Geq = 0.85´ (60 + 50) ´ 9.8=916.3kNFEk = a1Geq = 0.116 ´ 916.3 = 106.29kNT1 > 1.4Tg = 1.4 ´ 0.25 = 0.35s?,?Tg = 0.25s < 0.35sdn = 0.08T1 + 0.07 = 0.08´ 0.358 + 0.07 = 0.10FEk (1-d?n ) = ?´106.29 ´ (1- 0.10) = 35.87kNF1 =?G1H1å Gi Hi?60 ´ 9.8´ 460 ´ 9.8´ 4 + 50 ´ 9.8´ 8FEk (1-d?n ) = ?´106.29´ (1- 0.10) = 59.79kNF2 =?G2H2å GiHi?50´ 9.8´860´ 9.8´ 4 + 50´ 9.8´8