In This article, I have Covered The Content That How To Design Slab bridge In Midas Civil As Per Indian Code IRC 112. I Have Applied The Basic Steps To Understand For The Beginners or New Users during Designing of Bridge. I described Here Step by Step During Designing of Bridge.

Slab Bridge Design In Midas Civil As Per IRC112

Slab Bridge Design in Midas Civil As Per IRC 112:

The following steps You Have To Follow To Design The slab Bridge In Midas Civil- 1. Units Setting 2. Define Material Properties 3. Define Section Properties 4. Create Geometric Model 5. Define Groups 6. Define Boundary Condition 7. Define Statistic Loads 8. Define Live Loads Combination 9. Perform Analysis 10. Result Analysis 11. RCC Design 12. Design Report

Figure-1: Overall View of Slab Bridge

This is an overall view of the slab the length of the bridge is 10 meters, the overall deck width is 8.4 meters and the overall depth of the deck slab is 0.7 meters.

Figure-2: Cross-section in the longitudinal direction.

This is the cross-section in the longitudinal direction and the length of the bridge is 10.0 meters. I divide it into 12 sections. The intermediate 8 sections are each 1.0 meters and the outer four sections are 0.4 meters and 0.6 meters.

Figure-3: Cross-section in the transverse direction

This is a cross-section in transverse directions and the width of the web is 7.0 meters. I divide it into 7 sections, each of 1.0 meters. The width of the flange is 0.7 meters and the depth of the flange is 0.225 meters and the overall depth of the deck is 0.7 meters.

The following steps are:

1. Units Setting:

At first, you have to open a new project and set the units Kilo-newton, meter. Go to tools and click on unit set- meter, kilo newton, and temperature in Celsius.

2. Define Material Properties:

The next step is defining property sections. You have to define the material property. Click on material property and add. The material will be concrete and define the name M 30, put the IRC code IRC 112, M 30 and the remaining data will be automatically input. Next click on apply.

Define the material as a dummy for the dummy members. In the case of the dummy, you have to select none. Automatically it will be filled. In the case of dummy members, the weight density will be zero. Then apply okay.

3. Define Section Properties:

Next, you have to define the section property. Click on section property. the sections will be solid rectangular and define the name as midsection and click on user. User means I am providing the height and width.

Mid Section: Height will be 0.7 meters and width will be 1.0 meters.

Change the offset-center to top, click-okay, and apply.

End Section:

Now define another section as the end section. The section will be also solid rectangular and define the section name as End section. Click on user.

The height of the end section will be 0.225 meters and the width will be 1.0 meters.
Next, change the offset from center to top. Then click on okay and apply.

Dummy Section:

Now define the dummy members. In case of dummy click on user. It will also be solid rectangular and the height will be 0.225 meters. The width will be 1.0 meters and change the offset center-top.

Dummy crash barrier:

Define the crash barrier as a dummy crash barrier. The height and width will be 0.225 meters and the width will be 0.225meters. Change offset center to top. Click on ok and apply.

4. Create a Geometric Model:

Now close all windows and next create nodes and elements.
At first, you have to create an origin. (0,0,0). Next, click on apply and you can see the origin.
going to take unequal distance. The member's direction will be in the X-direction.

Create a Beam Element:

Now create a beam element with the help of extrude options. Click on extrude and take M 30, mid sections.

you can take equal distance or unequal distance. But I am providing the unequal distance that's why I am At first, I am providing 0.4 meters, the length of the beam will be 0.4 meters. You have to select the points, next okay, and apply. Next, select the end point of beam and input 0.6 meters. Next, okay, and apply.

Next Select the endpoint and create a beam element 1.0 meters up to 8 times. You have to input like that 8@1.0

Next, create the beam element 0.6 m and 0.4 m.

The beam element (0.4 m+0.6 m+8@1.0 m+0.6 m+0.4 m) along longitudinal Direction. This is the beam element along the longitudinal direction.

Alternate process: click on an equal distance and input 0.4, 0.6, 8@1.0, 0.6, 0.4. The beam (Length=10.00m) will be created at once.

Translate the beam element:

Now, translate this beam element along the y-axis. Select the beam element and translate it. Click on translate. I am going to translate in y-axis in equal distance or maybe you can use the unequal distance. So in equal distance i am taking along y-axis one meter it six times (6@1.0 m). click on okay and apply. You can check the 3-D view.

Next, translate it along y directions the distance will be 0.85 meter. apply and also the outer beam translate in opposite of the y directions. In case of opposite of downward directions, you have to put the negative sign and apply.

Select the both outer the both outer beams. open tree menu 2, and go to the end section property. Click and drag on model. the section and material property will be changed on both outer beams. I am going to provide the dummy members. At first you have to translate the nodes at outer sides. Translate the nodes along y axis at 0.35 meter up to end of the structure. Next intercept frame element click here and apply This is already this is has been translated and same process you have to apply here. Select the nodes and elements but i am going to translate the only nodes in opposite direction of the y axis. So you have to provide the negative sign and apply. You have to click the outer all nodes and use the extrude options, material property shall be changed dummy members. I am going to provide here. In case of unequal distance along y axis. At first i am going to put 0.35 meter, 0.85 meter, 6@1.0 meter, 0.85 meters and 0.35 meter. Click on apply. The dummy members have been created. You can check all the dummy members in 2D and 3D view.

Now i am going to create the dummy crash barrier elements at both outer sides. So go to create the elements. Click on material dummy and the section will be dummy crash. Click here node connectivity click on one node to another nodes. You have to repeat the process on other side also and now you can see the 3 D view.

5. Define Groups:

First, go to work and double click on dummy members. All dummy members will be selected and open the team menu 2 and create the group. Define the group name as cross beam. Next click on selected members and drag to the group in tree menu 2. You can see 130 elements have been grouped in cross beam.

6. Define Boundary Condition:

Now i am going to define the boundary conditions. Here i am providing the bearings at the mid and both outer sides. I am assuming thickness of the bearing will be 0.1 meter. So the nodes have to translate at the bottom of the deck and at 0.1 meter.

So, select the middle node and side notes and translate it at bottom of the deck slab. (put 0.7 meter in negative sign). next translate it at -0.1 meter.

The similar process you have to repeat here. Now I have to provide the elastic link and rigid link. So, go to boundary condition go to the rigid link. In the case of a rigid link, the rotation and displacement all along all directions will be fixed. Click on the rigid link. Select the master nodes point and provide the rigid link. Next I i am going to provide the elastic link. Click on the elastic link. Click two nodes where you have to link the elastic link. You have to repeat the process for the other cases. After defining boundary conditions, Up to Six Steps I have completed in this Video. The Remaining Six Steps I will Upload In The Next part.

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Slab Bridge Design In Midas Civil As Per IRC 112

Slab Bridge Design In Midas Civil As Per IRC112

1. Units Setting:

2. Define Material Properties:

3. Define Section Properties: