弯矩Md:=8505σde:=Mde?10I3Vde?1036Me:=9720平均弯矩Mde:=Md+Me2Mde=9.113×102015-12-93KN?m?h032σde=265.458N/mm2τde:=h03?tw3τde=13.473λb4:=N/mm2h03tw3?177?fy235λb3=0.635因双轴对称截面梁的受压翼缘扭转受到约束σcrde:=fifλb4≤0.85?1?0.75?(λb4?0.85)????fif0.85<λb4≤1.251.1?ah03fλb4=1.796h03h03?41?tw3?4+5.34?????a?h0341?tw3?5.34+4??τcrde:=fvifλs4≤0.822ifλb4>1.25σcrde=295N/mm2λs4:=?fy235ifah03≤1?h03?2?fy235ifah03>1λs4=1.069
??a??1?0.59?(λs4?0.8)????fvif0.8<λs4≤1.21.1?fvλs42τcrde=143.029
N/mm2
ifλs4>1.2集中力均为次梁传来,且次梁处设加劲肋。σcde:=0
?σde?+?τde?+(0)2=0.819?????σcrde??τcrde?5）中间区格ef段
22≤1.0满足要求
剪力Vef:=135KN
Mf:=10125平均弯矩Mef:=Me+Mf2Mef=9.922×10N/mm2
3
弯矩Me:=9720σef:=Mef?10I4Vef?1036KN?m
?h042σef=240.254
τef:=h04?tw4τef=3.866λb4:=N/mm2h04tw4?177?fy235λb4=0.738因双轴对称截面梁的受压翼缘扭转受到约束σcref:=fifλb4≤0.85?1?0.75?(λb4?0.85)????fif0.85<λb4≤1.251.1?ah04fλb4=1.5469~6
2ifλb4>1.25σcref=295N/mm22015-12-9λs4:=h04?fyifa2235h04≤141?tw4?4+5.34???h04??a??h04?fya2235ifh04>141?tw4?5.34+4???h04??a??τcref:=fvifλs4≤0.8??1?0.59?(λs4?0.8)???fvif0.8<λs4≤1.21.1?fv>1.2λs42ifλs4集中力均为次梁传来,且次梁处设加劲肋。?22?σef??σcref??+??τef??τcref??+(0)2=0.664≤1.0六、验算腹板和上翼缘的焊缝强度 根据GB50017?2003第7.3.1条
焊缝高度
hf上:=6mm
Vmax:=Vab上翼缘毛截面对梁中和轴的面积矩Sf1:=b1?tf1?(h1?tf1)2有固定集中力处,有顶紧上翼缘的支承加劲肋时?21Vmax?103?Sf1?2?0.7?hf上???I1??+02=69.727≤λs4=1.203τcref=129.266N/mm2σcef:=0满足要求Vmax=1.215×10
3
KN
Sf1=8.24×106
mm3
F0:=0
ffw=160N/mm2
9~7
2015-12-9
1?α1?λn=0.90712
?2???α2+α3?λn+λn?()(α2+α3?λn+λn)22??4?λn?=0.9172?2?λn29~8
因双轴对称截面梁的受压翼缘扭转未受到约束
λb1
h01tw1?153?fy2352015-12-9
9~9
简支钢梁稳定设计计算书(Mathcad) - 图文
