3/26/2021 0 Comments Box Culvert Design Excel Sheet
The critical location of wheel load on the box culvert for maximum moment is given in Fig 15 below.If you missed the post, kindly follow the link below to read it; Loading and Analysis of Box Culverts to Eurocode 2.Here is a quick a recap of the properties of the box culvert under consideration.This means that the width of the box culvert that will be input into Staad Pro is 2.5 m, while the depth will be 2.0 m.
This can be started by forming the nodes in the global XY plane, and then copying and pasting for the length of 8 m in the Z global direction. The final output of the meshing operation is as shown below. A purely rigid approach will involve using fixed supports, but note that employing 3D model for this purpose will not be very appropriate, but a simple 2D frame model will be better. There are many proposals on how culverts can be modelled as 2D frames, and the reader is advised to consult as many publications as possible. However, to incorporate the effects of soil-structure interaction (to a limited degree though) on our model, we can employ the use of elastic plate foundation option on our model. Angle of internal friction of 30 can suggest a loose medium dense sand in its undisturbed state, therefore we can take a modulus of subgrade reaction of 50,000 kNm 2 m for a well compacted sand. For a slightly compacted sand, you can take a value of 30,000 kNm 2 m. So we can input this option into Staad Pro using compression only option (see the dialog box below in Fig 4). If you review our previous post, we considered two construction cases. Please note that effects of ground water and the pressure in the shell of the culvert when it is filled with water is an important load case too but was not considered in this post. We have determined the magnitude of these loads in our previous post, and we are going to apply them on the box culvert for Case A and Case B. I will only demonstrate how load case 5 can be applied, since it will involve using the hydrostatic load command on Staad. In this case, EN 1990, EN 1991-1, EN 1991-2, and EN 1997-1 can be consulted. Note that culverts are also analysed for other loads such as temperature effects, collision on head walls, centrifugal actions, braking actions, etc. Therefore, provision of H16200 cc (A sprov 2010 mm 2 ) on each face will be adequate. As a reminder, the nature of Load Model 1 (which can be used for global and local verification) on the culvert is given in Fig 14 below. Note that you cannot apply a moving load directly on plate elements on Staad Pro, but you will need to create dummy beam members of negligible stiffness so that the axles can sit on them. In this post, we are not going to bother ourselves with the process, but we are going to treat the wheel load as static. Therefore, we are going to apply static wheel load at that location. Box Culvert Design Excel Sheet Full Tandem SystemRemember that it is always recommended to apply the full tandem system of LM1 whenever applicable.
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