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I am designing a 13-span curved bridge for railway, part of which is shown in the image uploaded. The members between piers in the image are the girders. Piers P142 and before support a pocket track which is why there are 3 girders. P143 onwards only support 2 girders. These are...
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In our railway project, there are concrete barriers at both guide-way edges.
The formula I used is the one on AASHTO LRFD 2012 Page 13-19
If the barrier is sloping (150mm at top, 200mm at bottom, 1200mm in height), what is the thickness that should be considered when calculating for...
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I am designing 8m high MSE Wall. There is a 0.6m diameter high pressure water supply pipe 1.2m below NGL, along the wall alignment. What could be done to prevent any settlement from the MSE Wall?
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I am designing an mse wall abutment (stub abutment supported by deep foundation). I have already designed MSE walls before the bridge abutment (along/parallel to traffic). In my understanding, if the conditions for back-to-back MSE walls in the NHI code are satisfied (length of...
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We tried to replace some of the fine aggregates with different materials. In my understanding, the equipment we have can test concrete cylinders or cubes for compressive strength. The samples would be unreinforced. But for checking of flexure using centre load test, should we add...
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For bridges, should the mass of pile or other foundations below ground surface be considered for response spectra or seismic analysis? Why or why not?
Thanks!
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I was assigned to determine the bearing capacity for a group of drilled shaft/bored piles. I used AASHTO LRFD 2012 as basis for my design. The cap would be 5m x 5m with 4 to 5 piles of 1m diameter. The cap thickness would be 1m to 2m.
Is it correct that I based my reduction factor...
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I have been assigned to design barrier for a railway. Here is the definition from our design criteria:
"For Piers and other guideway support element situated in less than 3m from the edge of adjacent highway shall be designed for horizontal static force of 1000kN, unless protected by...
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I have to apply wind load on the bridge I'm designing using AASHTO LRFD 2012.
The problem is that the base wind pressures on the code are based on a 100mph wind velocity (160kph).
The area I'm designing it for has 200kph wind velocity, so the table would be inaccurate to...
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I am designing a 21 span viaduct (with aashto girders). Where should I put the expansions? I'm assuming that that there should be expansions when the girder type changes. My basis is AASHTO LRFD 2012 but I can't seem to find expansion piers in the code.
Thanks!
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I have been assigned to design viaducts which must include wind load on structures and wind load on live load. I might be designing using STAAD or MIDAS. How do I apply the wind load on live load? Should I put it in the model as a moving load that moves with the train or should I just...
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I am designing columns and piles for a viaduct.
It has a single column and a single pile on all piers. One of my columns, with an unsupported height of 13.7m (12.7m clear height) has a deflection of around 160mm for longitudinal direction and 340mm for transverse direction at the...
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I am designing MSE wall for a railway project. Some parts of the railway are elevated and need MSE wall because there are roads on the sides.
How do I consider the soil reinforcements when checking for overturning, sliding? Should I consider the mse wall soil reinforcement length...
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I am designing retaining walls to be used on a railway project. AASHTO LRFD is required for the design.
Which parts of the code should I read & apply to my design?
For the retaining wall, I have already considered active soil pressure, seismic soil pressure using mononobe-okabe...
