Outside Overhead Connection Crane Finish Stop Design.Assist!
Exterior Overhead Link Crane Finish Stop Design.Help!
I have always been in the process of designing an end end for an exterior overhead double girder bridge crane application. I are fairly self-confident in identifying the impact push that the finish stop requirements to become made for centered on the Kinetic Energy Equation (1/2.W.v^2/g.H), nevertheless please right me if I have always been incorrect. W = 1/2. weight of bridge + weight of cart (357656.2 lbf), v = 100% of complete ranked bridge velocity (417 fpm), g = acceleration of world's gravity (32.16 ft/s^2), and Beds = hydraulic bumper stroke (16 in.). Analyzing this formula I get a collision drive of (103,233.8 lbf). I approved the make use of of this equation with the AIST Technology. Report No. 6, Whiting Crane Handbook, and AISC Eng. Diary'Ideas for Staying away from Crane Runway Issues'. The crane producer areas in their specs that the bumper stunning force is usually a 200,000 lbf per bumper, consequently we possess used this worth to design end cease for since it surpasses our calculated collision drive.
Since this is usually an outside software and the crane can be not inside of a developing The Whiting Crane Guide, AIST Technology. Report No. 6, and AISC Eng. Log'Suggestions for Avoiding Crane Runway Problems'condition that the finish prevent design needs to consider wind causes used over the surface area area of the crané.
Whiting Crané Handbook says 'Include for 10 pounds per rectangular foot wind on projected area of crane fór out-door cranés.'.
Do you simply figure out a wind force based on multiplying 10psf. the surface area of the crane and separate this amount by 2 to get the blowing wind load on each halt? or do you determine the breeze power, and centered on this blowing wind force using the basic physics formula F=ma determine a crane velocity owing to the blowing wind, speed up the crane over the complete duration of the runway, and after that figure out a last speed at the finish of the runway. This velocity can after that be used into the Kinetic Power Formula above to figure out the collision force owing to wind flow? Are steering wheel frictional energies and drag fighting off this acceleration to end up being accounted fór in this?
AlSC Eng. Newspaper claims, 'As soon as, this blowing wind force had been approximated by calculating the up and down projected area of the crane and growing by a push of about 10 psf. Today, the procedure is certainly a bit more difficult, Refer tó pgs. 92 and 93 of Whiting Crane Guide, wherein a technique of calculating wind pressure is described centered on ANSI suggestions'.
As pointed out above Whiting Crane Guide doesn'capital t create it any even more complicated than just incorporating 10psf breeze, although I don't have a duplicate of the ANSl standard the AlSC log pertains to secondly.
AIST TR#6 says, 'Wind a lot on cranes that function in subjected areas shall end up being calculated with factor of geographic
location, height above terrain and form of the specific parts that make up the framework. In the caIculation of thése
a good deal, the info in ASCE 7 should end up being implemented. In-service wind shall become computed as needed under Section 2.3.3
of this record, and shall have got a size equivalent to 25% of complete wind fill.'
I decided to use the needs out of thé AIST TR#6 since it appeared to possess a little little bit more technical details on the désign of cranes, ánd the finish stop accident design process for all three actually didn't differ much except in the breeze force determination.
I guess my primary question is certainly how will wind have an effect on the impact pressure on an end end and what will be the correct way to use that wind flow force. Nothing at all i read through appears to provide me parameters like as apply the wind over the complete size of the runwáy?, my runway is definitely 350 feet long so is definitely it sensible to consider an approximated 10psf breeze insert blowing continuously over 350 foot? perform you think about that the storm pins and brakes fail since these are usually a necessity for outdoor cranes?
If i suppose worst situation scenario that the hooks fail, brakes end operating and with á 25% of complete wind insert drive over the full length of runway i obtain a accident force up-wards of 1.4 million lbs. This appears pretty unreasonable to design for? Actually worse is if you consider a complete wind insert push.
As you can observe i have always been pretty confused so any assist would end up being greatly valued.
Thanks in progress.
Since this is usually an outside software and the crane can be not inside of a developing The Whiting Crane Guide, AIST Technology. Report No. 6, and AISC Eng. Log'Suggestions for Avoiding Crane Runway Problems'condition that the finish prevent design needs to consider wind causes used over the surface area area of the crané.
Whiting Crané Handbook says 'Include for 10 pounds per rectangular foot wind on projected area of crane fór out-door cranés.'.
AlSC Eng. Newspaper claims, 'As soon as, this blowing wind force had been approximated by calculating the up and down projected area of the crane and growing by a push of about 10 psf. Today, the procedure is certainly a bit more difficult, Refer tó pgs. 92 and 93 of Whiting Crane Guide, wherein a technique of calculating wind pressure is described centered on ANSI suggestions'.
AIST TR#6 says, 'Wind a lot on cranes that function in subjected areas shall end up being calculated with factor of geographic
location, height above terrain and form of the specific parts that make up the framework. In the caIculation of thése
a good deal, the info in ASCE 7 should end up being implemented. In-service wind shall become computed as needed under Section 2.3.3
of this record, and shall have got a size equivalent to 25% of complete wind fill.'
I decided to use the needs out of thé AIST TR#6 since it appeared to possess a little little bit more technical details on the désign of cranes, ánd the finish stop accident design process for all three actually didn't differ much except in the breeze force determination.
I guess my primary question is certainly how will wind have an effect on the impact pressure on an end end and what will be the correct way to use that wind flow force. Nothing at all i read through appears to provide me parameters like as apply the wind over the complete size of the runwáy?, my runway is definitely 350 feet long so is definitely it sensible to consider an approximated 10psf breeze insert blowing continuously over 350 foot? perform you think about that the storm pins and brakes fail since these are usually a necessity for outdoor cranes?
If i suppose worst situation scenario that the hooks fail, brakes end operating and with á 25% of complete wind insert drive over the full length of runway i obtain a accident force up-wards of 1.4 million lbs. This appears pretty unreasonable to design for? Actually worse is if you consider a complete wind insert push.
As you can observe i have always been pretty confused so any assist would end up being greatly valued.
Thanks in progress.
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