Bearing Design Parameters

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yanzliu
Bearing Design Parameters

Hi Rick,
I have download the PGSuper Version 3.0.0.57 (x64). I am trying to design
the bearing pad so I printed out the Bearing Design Parameters Report. I
have two questions for the output.

1. For the maximum service limit state rotation due to total load, I need to
add the rotation of excess camber. I remember the old version gave out the
rotation of excess camber directly. But the new version gives Excess Camber Slope (ft/ft) in Bearing Geometry Table. That means I have to calculate the rotation from the
Excess Camber Slope. Do I understand it right?

2. The first Table in the output gives Girder Bearing Reactions, and "Design
Live Load" is listed in the Table. The third Table also gives Girder Bearing
Reactions with "LL Design". What are the difference with this two Live Load?
Is the one in first Table considering the worst case for all live loads
while the one in third Table considering only the Vehicle live load?

Thanks,
Yan

Rick Brice
#1) This is small deflection

#1) This is small deflection theory. Slope in ft/ft is the same as rotation. You can use the excess camber or you can compute a slope based on the contributions of individual loads

#2) There is no difference between these outputs. A new version of BridgeLink:PGSuper was released today that provides better description of the results.

yanzliu
Need Further Help on 2nd Question

Hi Rick,

#1) That sounds good! Thank you!

#2)I still get the same answer. Maybe my question is not clear. I wish I can post a picture here but cannot. Let me try one more time.

Under " Bearing Design Parameters ":

1st Table: Girder Bearing Reactions
What does the "Design Live Load" in this Table include? Is this the worst case considering Design Vehicles and other Live Load, while 3rd Table only consider Design Vehicles? The live load reaction list in 1st Table and 3rd Table are different (13.76kips vs 8.3kips)

2nd Table: Girder Bearing Reactions (This is for DL)

3rd Table: Girder Bearing Reactions - Design Vehicles (without Impact)

Thanks,
Yan

YZL

Rick Brice
See PGSuper FAQ, Question

See PGSuper FAQ, Question #23.
http://www.wsdot.wa.gov/eesc/bridge/software/index.cfm?fuseaction=FAQs&s...

Table 1 has per lane results with an indicator of the controlling vehicle
Table 3 has per girder results

yanzliu
Not Solved

Hi Rick,

Is there any way to send you a screen shot of the output? We are looking at different things. Both Table 1 and 3 are for live load per girder without impact. And both seems for vehicle load but the results are different.

Thanks,
Yan

YZL

Rick Brice
Make sure you have the latest

Make sure you have the latest version of the software. As I mentioned in an earlier post, a new version was released yesterday. The table 1 was modified slightly based on your original question.

In PGSuper Version 3.0, Table 1 and Table 3 both report results per girder. The live load results in Table 1 and Table 3 are exactly the same and are the controlling of the various design live load vehicles.

In PGSuper Version 3.1, released yesterday, Table 1 has per lane results and Table 3 has per girder results. This is consistent with all the other tables in the PGSuper results.

This issue is a matter of interpreting results. This is getting beyond the scope of support that WSDOT will provide. Here is a link to our support policy.

http://www.wsdot.wa.gov/eesc/bridge/software/Documentation/bridgeLink/1....

You can continue to post questions in these forums and wait for responses from other PGSuper users. Alternatively, you can consider professional support options.

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