鋼箱梁疊合底模檢算1

1、鋼箱梁疊合層底模檢算一、 10*10cm方木（縱梁）檢算：跨度為L(zhǎng)=1.9m,間距為0.397m1、 荷載計(jì)算： 疊合層砼自重: q1=0.397×0.15×25=1.489 kN/m 施工荷載: q2=0.397×2.5=0.993kN/m 振搗荷載: q3=0.397×2.0=0.794kN/mq= q1+q2+ q3=3.276kN/m故10*10方木上所受線荷載如下圖：2、抗彎?rùn)z算：Mmax=ql2/8=(3.276×1.92)/8=1.478kN/mW=bh2/6=0.1×0.12/6=1.667×10-4m3ma

2、x=Mmax/w=1.478/1.667×10-4=8.9Mpa<=11 Mpa故:抗彎滿足要求：3、抗剪檢算：Q=R支=ql/2=3.276×1.9/2=3.11 kNA=0.1×0.1=0.01m2max=3Qmax/2A=3×3.11/（2×0.01）=0.47Mpa<=1.8Mpa 故:抗剪滿足要求4、撓度檢算：f=5ql4/384EI=5×3.276×19004/(384×9000×8.3×106)=7.4mmf=L/250=1900/250=7.6mm>f=7.4m

3、m撓度變形滿足要求二100槽鋼（橫梁）檢算： 跨度為L(zhǎng)=2.1-0.2×2=1.7m縱梁上承受5組Ni=2×R=2×3.11=6.22kN的集中荷載，受力圖如下：1、抗彎?rùn)z算：M1max=N1L/4=(6.22×1.7)/4=2.64kN mM2max=N2 a2=6.22× (0.397+0.056)=2.82kNM3max=N3×103mm3=39.7×10-6m3W=39.7×103mm3=39.7×10-6m3max=Mmax/w=5.81/39.7×10-6=146.3Mpa<=

4、170Mpa故抗彎滿足要求2、抗剪檢算： Qmax=R=6.22×5/2=15.55kNA=12.74×102mm2=12.74×10-4m2Max=3Qmax/2A=3×15.55/(2×12.74×10-4)=18.3Mpa<Mpa3、撓度檢算：f=N1L3/48EI+N2a2× (3l3-2a22)+ N3×a3 ×(3l2-2a32)/24EI=6.22×103×17003/48×206×103×198.3×104+6.2×

5、;2103×453 +(3×17002-4×4532)/2×4206×103×193.3×104+6.22×103×56×(3×17002-4×562)/24×206×103×193.3×104=4.2mm撓度變形滿足要求二 鋼檢算：由設(shè)計(jì)圖得角鋼受力圖如下：1、抗彎?rùn)z算：Mmax=NL=15.55×.2=3.11kN mW=32.52×103mm3=32.52×10-6m3Max=Mmax/w=3.11/(32.52×10-6)=95.6Mpa<=170Mpa故抗彎滿足要求四120角鋼與箱梁間焊接檢算：根據(jù)設(shè)計(jì)要求,采用角焊接,焊接有效寬度為:b=0.7×10mm×cos45o=4.9mm則焊接受力圖如下:為保證角鋼平行,則:Mo=0 H×0.08-N×0.2=0H=N×0.2/0.08=15.55×0.2/0.08=38.9KNH=1/2ha aHa=2h/a=2×38.9kN/0.