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cknn 发表于 2021-5-12 14:20 ![](static/image/common/back.gif)
有问题请教一下楼主, allowable ground bearing capacity 和 Ultimate Bearing Capacity 的问题, 能简单 ...
The ‘geotechnical ultimate’ bearing capacity is the calculated ultimate
bearing capacity of the soil in geotechnical terms. The ‘structural’
(or ‘dependable’, ‘allowable’, ‘reduced’) ultimate limit state bearing
capacity’ is the geotechnical ultimate bearing multiplied by a strength
reduction factor (normally in the vicinity of 0.5), to be compared
with fully factored loads as per AS/NZS 1170. The ‘allowable bearing
capacity’ is the geotechnical ultimate limit state bearing capacity divided
by a factor of safety (often 3), to be compared with unfactored working
loads (ie. the old ‘working stress’ method),
这是Canterbury residential technical guidance - References说的
building code里面 allowable是用ultimate除以factor of 3 load不用factor up
reduced是乘以0.5左右 但是load也要factor up 这是limit state design而不是factor of safety design
geotechnical ultimate bearing capacity没有误解 直接算就好 size和depth其实会有影响。 但是最简便的就是5.14 x undrained shear strength 也就是shear vane measured strength 200kPa很简单的 |
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