My company is designing an elevated platform that extends around all sides of a large piece of equipment. The platform is 3'-0" wide, but there is a small section with a pipe interference where we need to reduce the platform width to 16" This is only a maintenance platform and would not need...
I am attempting to analyze sheet piling and size for an estimate. The piling is to be used for a construction excavation. The piling will be approximately 26' deep and must resist very large pressures due to groundwater. I have referenced the US Steel sheet pile design manual and have...
I am looking at an under-hung monorail and am trying to verify the correct way to combine the local flange stresses with the strong and weak axis bending stresses. I am using the procedure in CMAA-74 to determine the local transverse and longitudinal stresses. I have seen several spreadsheets...
I am working on a non-building structure that I classified as being similar to a building. The structure falls under seismic design category D. I want to use an(SCBF) lateral force resisting system, but there has to be a large opening at the base. Because of this, the bottom bay cannot have...
I am working on a non-building structure that I classified as being similar to a building. The structure falls under seismic design category D. I want to use an(SCBF) lateral force resisting system, but there has to be a large opening at the base. Because of this, the bottom bay cannot have...
I have been trying to find a copy of this supplement but have had no luck. The only thing I can find is that is located in the newer version of ASCE 7-05. I have the older version, so I don't really want to buy the whole new book. Is the supplement only available somewhere? I have a project...
I am designing an underhung crane and currently have a cross section consisting of a built up wide flange and channel cap system. The channel has been provided for bending in the out of plane direction. However, I am running to the issue of resolving the torsional forces. The torsional stress...
I have a situation where I am designing a new concrete pier to be installed to an existing mat foundation. The pier is to be fixed at the base and I am having trouble getting the anchorage to the mat to pass code. Bars are to be anchored to the mat using an epoxy system and I am having no...
I have a situation where a slab supporting precast concrete panel veneer has cracked and I am having trouble determining the cause for the cracks. The foundation system is grade beam on auger cast pile. The structural system is steel framed with brick veneer. However, in this particular side...
I have a proposed building site that is a reclaimed surface mining area and the building is to be placed on approximately 200 feet of mine spoil fill. The fill has been in place since approximately 1992, so it is expected that most of the soil consolidation has already taken place. However, it...
I have interior 8" cmu walls suporting joists on both sides. Typically, I would stagger the joists since the standard joist bearing length is 4" and placing them at the same locations would not allow this. However, is it acceptable for joists to bear at the same location if placed on the same...
I am analyzing an existing roof for potential additional snow loads. The building roof structure is timber joists and girders. The building is very old and there are no grading stamps to be found. The lumber appears to be rough sawn spruce and from what I understand, local spruce was likely...
I have a new proposed building design that is going to be placed directly next to an existing building with no separation. The new structure is 4-story steel framed construction while the existing building is 2-story and the main load resisting system is unknown. The seismic design category is...
I am designing a 4 story building with a basement that will be placed on auger cast piles. The perimeter of the building will be placed on grade beams to support the basement wall as well as a brick facade above. With the exception of the basement wall, the support structure is steel. So, any...
I am designing a composite floor system with metal decking and concrete and I typically consider only the beams perpendicular to the deck span to act as composite. It has been suggested for this project to also consider the girders running parallel with the deck span as composite. The...
I have a situation where I will need pin or micro piles to extend approximately 2 or 3 feet into bedrock. Can this be achieved by driving them or will they need to be drilled? Most references that I can find indicate that they would need to be drilled.
Is it common practice to design for overturning moment due to base shear and the distance from the top of the pedestal to the bottom of footing? I have seen cases where the column and foundation were assumed to act as one and only the shear force considered. In this case, the column is not...
