What is bridge load rating?

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● Outline
● What is bridge load rating?
● What is bridge load rating? (continued)
● Who is qualified?
● Purpose of load rating
● Load rating methods
● Live Loads
● Live Loads (continued)
● What should be load rated?
● What should be load rated? (continued)
● Reasons for re-load rating
● Reasons for re-load rating (continued)
● Federal Code of Regulations
● Federal Code of Regulations (continued)
● Minnesota Statutes
● Minnesota Statutes (continued)
● Bridge load posting
● Bridge load posting (continued)
● Bridge load posting (contined)
● What do you submit to MnDOT?
● What do you submit to MnDOT? (continued)
● Questions?

نوع زبان: انگلیسی حجم: 10.83 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 57 صفحه
سطح مطلب: نامشخص پسوند فایل: pptx
گروه موضوعی: زمان استخراج مطلب: 2019/05/17 02:45:56

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

load, rating, ., bridge, live, factor, capacity, inventory, rf, carry, level, structure,

توجه: این مطلب در تاریخ 2019/05/17 02:45:56 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://www.dot.state.mn.us/stateaid/training/bridge-load-rating-training-pa.pptx

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: load, rating, ., bridge, live, factor, capacity, inventory, rf, carry, level, structure,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

bridge load rating ۱ outline what is bridge load rating purpose of load rating who is qualified load rating methods live loads what should be load rated reasons for re load rating federal code of regulations minnesota statutes bridge load posting what do you submit to mndot ۲ what is bridge load rating bridge load rating – the determination of the live load carrying capacity of a bridge ۳ rf rating factor for live load capacity c capacity of the member d dead load effect on member l live load effect on member i impact factor a۱ factor for dead load a۲ factor for live load what is bridge load rating bridge load rating is the determination of the live load carrying capacity of a bridge the general equation is shown. it is expressed as a rating factor rf . the rf is simply the structure s capacity at material yield capacity less the dead load dl divided by the live load ll plus impact in other words the structure must have enough strength remaining after the dead load is subtracted to carry the live load. ۳ what is bridge load rating continued generally a rf ≥ ۱. indicates that the bridge has adequate live load carrying capacity generally a rf ۱. indicates that the bridge has inadequate live load carrying capacity ۴ by definition the adequacy or inadequacy of a structural element to carry a specified truck load will be indicated by the value of its rating factor rf that is whether it is greater or smaller than ۱. . for a bridge with a rf of greater than or equal to ۱. the bridge has adequate capacity to carry the live load for a bridge with a rf of less than ۱. the bridge does not have enough capacity to carry the live load therefore resulting in load posting of the bridge. so for a example if you have a rating factor of ۱. it means that the bridge’s capacity is exactly equal to the live load that’s put on it. if you have a rating factor of ۱.۵ that would mean that you have ۵ extra capacity more than the live load that being place on it. and if you have a rating factor of .۹ that would not be good because the bridge’s capacity is less than the live load you’re putting on it which would require the bridge to be posted. ۴ what is bridge load rating continued two primary types of loads used in load ratings. permanent or dead load structure self weight superimposed dead loads barriers overlays utilities etc. transient or live loads vehicular loads impact loads ۵ next let’s look at the load aspect of bridge load rating two primary types of loads use in load ratings dead load and live load. permanent loads are loads and forces that are constant for the life of the structure. they consist of the weight of the materials used to build the bridge. permanent load includes both the self weight of structural members and other permanent external loads. they do not move and do not change unless the bridge is modified. for example beams deck railing overlay sidewalk etc…. on the other hand a transient load is a temporary load and force that is applied to a structure which changes over time. in bridge applications transient live loads are moving vehicular or pedestrian loads. for example trucks cars pedestrians etc. to account for the affects of speed vibration and momentum truck live loads are typically increased for vehicular dynamic load allowance impact loads . this is the bouncing effect of vehicles when they drive across a bridge. vehicular dynamic load allowance is expressed as a percentage of the static truck live load effects. ۵ what is bridge load rating continued inventory rating – the load level that a structure can safely sustain for an indefinite period. operating rating – the absolute maximum permissible load level to which a structure may be subjected. ۶ bridges are rated at two different stress levels inventory level and operating level. inventory rating as defined by aashto is equivalent to the design level of stress it corresponds to the rating at the design level at which the bridge is safe for an infinite period of time operating rating is the maximum permissible live load that can be placed on the bridge. so it is the absolute maximum load that should be allowed on the bridge under any circumstances. operating rating is always higher than the inventory rating because it has a lower factor applied to the loads. in other words it has a lower factor of safety because the loads are specifically known. also the operating level is used for load posting and for evaluation of overweight permits. ۶ what is bridge load rating continued ۷ in the structure inventory report all bridge load rating information is located on the lower right hard corner of the sheet under capacity rating. information about the bridge’s design load inventory and operating rating posting information rating date and overweight permit codes are all given in this section. bridges load rated using load factor rating lfr and allowable stress rating asr inventory and operating ratings are expressed in terms of an equivalent hs truck and reported in tons. bridges load rated using load resistance factor rating lrfr the inventory and operating ratings are reported in rating factor. hl ۹۳ rating factor values cannot be converted to tonnage because it’s a notional load that includes a lane load. the design load inventory and operating rating shown in further discussed in …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: load, rating, ., bridge, live, factor, capacity, inventory, rf, carry, level, structure,

این فایل پاورپوینت شامل 57 اسلاید و به زبان انگلیسی و حجم آن 10.83 مگا بایت است. نوع قالب فایل pptx بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/05/17 02:45:56 استخراج شده است.

http://www.dot.state.mn.us/stateaid/training/bridge-load-rating-training-pa.pptx

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