风载荷

风载荷理论

在结构分析中,风载荷表示风施加在结构上的力。风载荷受地上高度和速度等因素的影响。这些力会严重影响结构和建筑的稳定性和结构完整性。SimSolid 会考虑风速、空气密度、方向性、摩擦阻力和形状系数等关键因素,在结构风载荷建模中起着至关重要的作用。SimSolid 会合并这些参数,帮助评估暴露在风中的曲面所承受的压力,准确计算结构挠度。

风廓线是影响风载荷的关键因素。SimSolid 支持两种截然不同的廓线:单值和对数。这些廓线作为数学模型,阐明了大气边界层内与地上高度 (H) 有关的风速的均匀分布或对数级数。

1.


在对数风廓线中,地上高度 (H)和风速 (V) 之间的对数曲线的插值点按以下公式计算。
V ( z ) = u κ ln ( H + 1 ) MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOvaiaacI cacaWG6bGaaiykaiabg2da9maalaaabaGaamyDaaqaaGGaaiab=P7a RbaaciGGSbGaaiOBaiaacIcacaWGibGaey4kaSIaaGymaiaacMcaaa a@4294@
其中,
u
剪切速度(默认 = ~0.5)
κ MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaaccaGae8NUdS gaaa@37AA@
冯-卡尔曼常数(默认 = ~0.41)
H
测量速度时离地面的高度
垂直于风向的曲面所承受的风压按以下公式计算。
P w i n d = 1 2 ρ a i r V 2 C MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiuamaaBa aaleaacaWG3bGaamyAaiaad6gacaWGKbaabeaakiabg2da9maalaaa baGaaGymaaqaaiaaikdaaaGaeqyWdi3aaSbaaSqaaiaadggacaWGPb GaamOCaaqabaGccaWGwbWaaWbaaSqabeaacaaIYaaaaOGaam4qaaaa @44A8@
其中,
P w i n d MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiuamaaBa aaleaacaWG3bGaamyAaiaad6gacaWGKbaabeaaaaa@3ABA@
风压
ρ a i r MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqyWdi3aaS baaSqaaiaadggacaWGPbGaamOCaaqabaaaaa@3AAA@
空气密度
V
风速
C
形状因子

对于平行于风向的曲面,包括摩擦阻力 ( C f MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaam4qamaaBa aaleaacaWGMbaabeaaaaa@37D2@ ) 由以下公式计算。

P w i n d = 1 2 ρ a i r C f V 2 C MathType@MTEF@5@5@+= feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiuamaaBa aaleaacaWG3bGaamyAaiaad6gacaWGKbaabeaakiabg2da9maalaaa baGaaGymaaqaaiaaikdaaaGaeqyWdi3aaSbaaSqaaiaadggacaWGPb GaamOCaaqabaGccaWGdbWaaSbaaSqaaiaadAgaaeqaaOGaamOvamaa CaaaleqabaGaaGOmaaaakiaadoeaaaa@4691@
摩擦阻力系数的默认值设置为 0.01。

提示: 启用屏蔽复选框可以保护被其他零件遮挡的组件免受风载荷的影响。取消选中时,风载荷将施加于所有组件,无论组件面向风源的曲面是否被装配中的其他零件遮挡。