几何尺寸与公差论坛------致力于产品几何量公差标准GD&T (GDT:ASME)|New GPS(ISO)研究/CAD设计/CAM加工/CMM测量 - 查看单个帖子

digester tank pad
fellers,
i am designing a concrete base/pad for a 1.5 million pound digester that is 24' in diameter. the tank is flat bottom bearing so it is about 3300 psf pressure. we will have 3500 psf soil allowable. what issues do i need to consider for designing the concrete pad since the pressure should be going straight thru
thanks

find a job or post a job opening
if the pressure is uniform as stated, with well prepared, compacted fill, i don't see the need for concrete pad.
the pad is somewhat elevated from the surrounding level for containment issues so we must support directly on concrete and a stone base on compacted soil.
if the pad is larger than the tank, you should check shear and bending on the ledge as usual for all loads and load combinations, and provide reinforcing as required. if there are tie downs, check shear and pull out strengths. otherwise provide minimum reinforcement to maintain the connectivity (for local pockets due to soil errosion, uneven settlement...etc). make sure there is no ground water issues, and the runoff is draining away from the concrete pad.
have you checked the foundation for seismic?

2009-09-08, 06:47 PM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	digester tank pad digester tank pad fellers, i am designing a concrete base/pad for a 1.5 million pound digester that is 24' in diameter. the tank is flat bottom bearing so it is about 3300 psf pressure. we will have 3500 psf soil allowable. what issues do i need to consider for designing the concrete pad since the pressure should be going straight thru thanks find a job or post a job opening if the pressure is uniform as stated, with well prepared, compacted fill, i don't see the need for concrete pad. the pad is somewhat elevated from the surrounding level for containment issues so we must support directly on concrete and a stone base on compacted soil. if the pad is larger than the tank, you should check shear and bending on the ledge as usual for all loads and load combinations, and provide reinforcing as required. if there are tie downs, check shear and pull out strengths. otherwise provide minimum reinforcement to maintain the connectivity (for local pockets due to soil errosion, uneven settlement...etc). make sure there is no ground water issues, and the runoff is draining away from the concrete pad. have you checked the foundation for seismic? __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]