文档介绍：Checking Calculation of TC2#
1. Calculation of supporting reaction
Load and key dimension
Load:M = f anchorage member
As per specification of manufacture of tower crane, the lattice structure with Channel steel and pattern panel of steel plate shall be applied. The section drawing can be seen as follows:
Considering the safety, we take the combination of maximum compression and longest anchorage member to calculate:
Tmax = =
Checking calculation for U steel
Checking calculation of strength in Y axis
iy==×20=
λ = Lmax/==<[λ]=150
According to the specification, φy=
Where:
— turning radius of lattice structure
h— height of web plate of U steel
λ — slenderness ratio
[λ]— allowable maximum slenderness ratio. Supply turning radius big enough to satisfy the rigid requirement.
φy — stability factor of lattice structure which is decided by the value of slenderness ratio as per specification .
σ=Nmax/(φy A)=465/=<[σ]=215MPa
OK !
Checking calculation of stability in X axis
When the axis compression lattice member lose the stability around virtual axis, the additional deformation shall arise from this failure, which is called “ lattice shearing deformation” . This affect shall be considered by the application of conversion slenderness ratioλox