預拱度(可按照比例推估),以下以鋼樑為例
1.A beam (or truss) 36' long with a deflection criteria of say L/360,
would have camber of 1".
2.For example,While a beam (or truss) 4.5' long with the same deflection criteria would have a camber of 1/8"
3.For steel bridges, we can adopt (100% DL + 75% LL) to compute the camber.
4How much Camber?
There are certain restrictions for cambering of beams. As a rule of thumb, beams with the following criteria cannot be cambered:
Beams less than 24 feet in length
Beams in moment frames
Beams shallower than 14 inches deep
Beams with cantilevered ends
PS.
Beams shorter than 24 (or 20~25)
feet are typically not cambered because they may not fit in the fabricator's machine and also it is not economical or practical to provide such a small camber.
Additionally, the AISC specifies minimum and maximum camber values depending on the beam depth and span.
For example, the minimum camber on a 24 inch deep wide flange beam
spanning between 65 and 85 feet is 3 inches and the maximum is 5 inches.
資料提供: 良泰大地土木結構技師事務所
e-mail:[email protected]
tel:06-2363337
1.A beam (or truss) 36' long with a deflection criteria of say L/360,
would have camber of 1".
2.For example,While a beam (or truss) 4.5' long with the same deflection criteria would have a camber of 1/8"
3.For steel bridges, we can adopt (100% DL + 75% LL) to compute the camber.
4How much Camber?
There are certain restrictions for cambering of beams. As a rule of thumb, beams with the following criteria cannot be cambered:
Beams less than 24 feet in length
Beams in moment frames
Beams shallower than 14 inches deep
Beams with cantilevered ends
PS.
Beams shorter than 24 (or 20~25)
feet are typically not cambered because they may not fit in the fabricator's machine and also it is not economical or practical to provide such a small camber.
Additionally, the AISC specifies minimum and maximum camber values depending on the beam depth and span.
For example, the minimum camber on a 24 inch deep wide flange beam
spanning between 65 and 85 feet is 3 inches and the maximum is 5 inches.
資料提供: 良泰大地土木結構技師事務所
e-mail:[email protected]
tel:06-2363337