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Hi all, I'm trying to design a perforated steel plate subject to two load cases, one of which is a ud area load, the other a point load. The steel plate is to be used as infill in a balustrade at a train station. I have found Pounder's equation which appears fine but it applies to the...

Hi all, I'm designing a member that is supporting vertical load. The member is to consist of 2 steel beams, one placed directly on top of the other. I want to design them to act compositely and therefore I want to use bolts to fix the top flange of the lower beam to the bottom flange of the...

Hi everyone. I have a query about simple lateral stability of buildings. If you take a simple cube and apply lateral forces to it (say east to west), I normally assume the roof and any floors act as deep horizontal beams and transmit all the forces back to supporting shaer walls (north and...

Hi all. I'm designing a timber cut roof with a lack of triangulation. It typically consists of 2 rafters supported at the feet on block walls. There is a raised collar tie about 1/3 depth from the ridge. There is no ring beam at eaves. Has anybody any experience in what to check for this case?

Folks, I have a lateral stability problem in an existing building that I would like a second opinion on if anybody can help. The building is approx 25m long (west to east) x 5.5m wide (south to north). There are 2 gable walls located at each end which provide my lateral stability in the...

Folks, I have a query that keeps appearing in front of me and I would like some advice, if possible. I have blockwork terraced buildings. Most of them would be retail units. As my building is a retail unit, it has a wide window opening located on the ground floor at the front of the building...

Folks, I have a lateral stability problem that keeps appearing in front of me. When looking at simple 2 storey housing of typical construction I would normally assume that any wind load on the front/rear walls is transmitted to the gables via diaphragm action of the timber floor. Also, any...

Folks, I'm trying to round off figures in microsoft excel but don't know how to go about it. For instance, round off 2387 to 2400. Has anyone any ideas how?

Hi folks. I'm design a steel A-Frame to support a portion of the roof of a dwelling. When I analyse it using a pin and roller support, I get a certain amount of horizontal kickout at the eaves, as expected. The supporting walls are block cavity masonry walls. Usually I would use a limit of...

Hi all, I'm designing an r.c column that is supporting precast concrete pedestrian bridge beams. The bridge spans over the mouth of a river and is supported from piles in the seabed. I have determined the wave, current, dead and imposed loads on the structure. Could anyone give me some...

Has anyone any idea on how I could calculate the natural frequency of a concrete bridge beam?

Hi guys. Has anyone got any advice on pre-cambering steel beams? I was going to pre-camber an amount equal to the total dead load for a beam supporting precast concrete slabs and blockwork walls. Then all my beam should deflect is the live load deflection, which I've calculated as being...

Hi folks. I have a job on site in which I designed a steel beam to carry some precast slabs and blockwork wall panels. The loads from these elements are basically acting through the centre of the beam. Consequently I designed a beam strong about the x-axis and weak about the y-axis. The...

Hi all. I'm designing a single storey basement car park, supporting 2 storey blockwork houses on top. I'm using a transfer slab to support the dwellings, which is supported on reinforced concrete columns and retaining walls. I've designed my slab within acceptable deflection limits (L/500 to...

Hi folks. I'm designing an r.c flat slab and I need drop down panels over my r.c columns to prevent punching shear. Has anyone any suggestions how I should detail my steel reinforcing bars? Should I lap the bottom bars in the shear head with the top reinforcement in the slab or the bottom...

Hi all. I'm designing a transfer slab that is supporting 2 storey blockwork dwellings. The transfer slab is 400mm tk. and is supported by r.c walls and columns in a basement car park. I'm using finite element analysis software to design it. I have taken the worst case loading over the...

I'm designing a raft foundation for Semi-D domestic dwellings. The contractor wants to use this form of construction, only if we can design the raft for a maximum thickness of 200mm. He does not want to use ground beams. It is only economical if we use mesh top and bottom and u-bars around...

I am designing a raft foundation using finite element analysis software. I need to insert a value for the stiffness of the bedding material (ie the soil). Could anyone give me some advice on how I calculate this value? I have heard that it is the allowable bearing pressure divided by teh...

I'm designing a raft foundation for a house. I note on most rafts that edge beams are used. Is it possible to omit these? Could somebody explain to me the exact function of them?

I am designing a cavity masonry wall that is supported on two separate 5m span lintels. The inner leaf lintel is also connected to steel posts and is acting as a wind portal. I am worried about the horizontal movement between the two leaves of blockwork and the effect it will have on the...