barrier moment slab design example

  • design standards as well as a wide array of rail examples of (both preliminary designs and final .... A coherent and unified railing design that incorporates the elements necessary for pedestrian and bicycle safety is preferable to simply adding decorative elements onto existing vehicle barrier designs. Caltrans. Bridge railings serve both safety and aesthetic functions in bridge projects. ..... Photo of Concrete barrier Type 80 on barrier moment slab over retaining wall with tribal design.


  • CONTRACTOR IS RESPONSIBLE FOR TEMPORARY BRACING design CALCULATIONS. CONTRACTOR IS RESPONSIBLE FOR LIFTING, HANDLING AND TRANSPORTATION STRESSES. IN ACCORDANCE WITH BD-629M. ENTIRE moment slab AND barrier ALONG THE REQUIRED LENGTH. DETAIL INFORMATION. ACCORDANCE WITH PUBLICATION 408. THE SHOP DRAWINGS MUST COMPLETELY DETAIL THE. barrier. CONTRACTOR& ...


  • “design OF ROADSIDE barrier. SYSTEMS PLACED ON MSE. RETAINING WALLS”. Prepared for. National Cooperative Highway Research Program. Transportation Research Board. National Research Council. Transportation Research Board. NAS-NRC. Privileged Document by. Roger P. Bligh. Jean-Louis Briaud. Kang Mi Kim and. Akram Abu-Odeh. Research Foundation Project . Texas Transportation Institute. Texas A&M University System. College Station, Texas.


  • The purpose of this study is to propose a simplified manual design approach for the barrier-deck overhang in concrete bridges. For concrete deck slab overhang and barrier, application of National Cooperative Highway Research Program crash test is reviewed. The failure mechanism, design philosophy and load cases including extreme event limit states for barrier and overhang are discussed. The overhang design for the combined effect of bending moment and& ...


  • This Structures design Bulletin implements new design requirements for sizing the moment slab. Uunction slab) for traffic railings constructed on top of ... The factored nominal static sliding resistance (q> Rn) to sliding of the traffic railing-moment slab system along its base shall satisfy the following condition ... COMMENTARY. Research conducted as part of NCHRP Report 663, design of Roadside barrier Systems Placed on MSE. Retaining Walls, concludes that a& ...


  • collision loads. MSE wall design is not part of this calculation book. design life is 75 years. Following material assumptions are made regarding the construction of the moment slab. Unit weight of concrete = 145 pcf. AASHTO LRFD Table 3.5.1-1.


  • This example illustrates the design of a full height abutment on spread footings for a single span cast-in-place post-tensioned concrete box girder bridge. The bridge has a 160 feet span with a 15 degree skew. Standard ADOT 32-inch f-shape barriers will be used resulting in a typical deck section consisting of. 1'-5” barrier, 12'-0” outside shoulder, two 12'-0” lanes, a 6'-0” inside shoulder and 1'-5” barrier. The overall out-to-out width of the bridge is 44'-10”. A plan view and typical& ...


  • The distance to the centroid is measured from the bottom of the girder. For the strength limit state, since the deck concrete is in tension in the negative moment region, the deck reinforcing steel contributes to the composite section properties and the deck concrete does not. As previously explained, for this design example, the concrete slab will be assumed to be fully effective for both positive and negative flexure for service and fatigue limit states. S.1 & S& ...


  • worked example. The LRFD design process for slab bridges is similar to the LFD design process. Both codes require the main reinforcement to be designed for Strength, Fatigue, Control of Cracking, and. Limits of Reinforcement. ... distribution factor is 1/2E. These distribution factors apply to both shear and moment. slab bridge slabs designed using the equivalent strip width method may be assumed to be adequate in shear (), but edge beams on slab bridges& ...


  • Massachusetts posting vehicles, load rating calculations shall be performed in accordance with Chapter. 7, Part I of this Bridge ...... shall be used to design the barrier and moment slab system as well as to design the MSE wall. 3 . 3 . 3 Pi e rs ...... For example, for a multi- span bridge where there is a longitudinal shear key at the pier to help share the longitudinal seismic force, this tributary permanent load would extend to the mid point of the span from the abutment to the pier. This more& ...


  • cantilever walls with attached traffic barriers, soil nail walls, soldier pile walls, soldier pile tieback walls and ..... The lateral pressure transferred from a moment slab shall be considered in the design of soldier .... Chapter 8. Walls and Buried Structures. WSDOT Bridge design Manual M 23-50.17. Page 8-17. June 2017. 8.2. Noise barrier Walls. 8.2.1. General. design of noise barrier walls shall be based on the requirements and guidance cited herein and in the current& ...


  • This example illustrates the design of a three span precast prestressed box beam bridge. The bridge has spans of 85.25, 86.50 and 85.25 feet resulting in equal lengths of the modified AASHTO BII-48 box beam in all spans. The bridge has zero skew. Standard ADOT 32-inch f-shape barriers will be used resulting in a bridge configuration of 1'-5” barrier, 12'-0” outside shoulder, one 12'-0” lane, a 4'-0” inside shoulder and a 1'-5” barrier. The overall out- to-out width of the bridge is& ...


  • Chapter 10. Signs, barriers, Approach slabs, and Utilities. WSDOT Bridge design Manual M 23-50.17. Page 10-29. June 2017. The torsional rigidity constant for moment slabs shall be based on a solid rectangle using the following formula: Where: 2a = total width of moment slab. 2b = average depth of moment slab. For example: Minimum moment slab Width = 48 inches: a = 24 inches. Minimum moment slab Average Depth = 10 inches: b = 5 inches. J = J60 = 13,900& ...


  • No sidewalks. Two traffic railing barriers and one median barrier. No phased construction. 30 degree skew. Three span continuous 35'-0" each for a total of 105'-0" bridge length. The following assumptions have been incorporated in the example: Intermediate bent cap design. Expansion Joint design. Edge Beam design. Solid c.i.p. slab design. The example includes the following component designs: This document provides guidance for the design of a cast-in-place flat slab bridge.


  • Bridge design Manual M 23-50. Foreward. August 2006. Foreword. This manual has been prepared to provide Washington State Department of Transportation. (WSDOT) bridge design engineers with a guide to the design criteria, analysis methods, and detailing procedures for the preparation of highway bridge and structure construction plans, specifications, and estimates. It is not intended to be a textbook on structural engineering. It is a guide to acceptable WSDOT.


  • The results showed that concrete barriers performed reasonably well under this load condition. () tested the concrete barriers used near the side slope of roads. slab connected to barriers usually resist moment to maintain structure stability. Single slope experimental models without moment slabs were constructed and tested using a bogie vehicle. Changing the design by adding soil beside the barriers reduced this deflection. () computed the lateral deflection of concrete barriers using& ...


  • Total weight of two barriers. (0.41 0.02)(2) 0.86 kip ft w = . = 3.3.2. Dead Load of Wearing Surfaces and Utilities, DW. Future wearing surfaces are generally asphalt concrete. New bridges require designing for a thickness of 3 in., which ..... Case 2 controls (truck lane). The example bridge has 4.092 live load lanes for maximum positive moment design. Live load distribution will be discussed in detail in Section 3.5. Dynamic load allowance (IM) is included in these.


  • Superstructure cross section consisting of a concrete deck with Jersey barriers on 5 steel girders which. Figure 2-1 ... The following slab and overhang thicknesses will be assumed for this design example: Formula: t subscript s = 8 point .... Based on Table 2-1, the maximum unfactored slab, parapet, and future wearing surface positive dead load moment occurs in Bay 2 at a distance of 0.4S. The maximum factored positive dead load moment is as follows: Formula: Mu& ...


  • The maximum negative moment is given in relationship to the distance from the centerline of the girder to the design section. In the design example, the girder width is 8 inches. The maximum negative moment design section is 4 in., which is the& ...


  • tion and sliding, barrier systems atop MSE walls, whether cast-in-place or precast, are designed to resist the impact load by calculations using simple statics over a 6 m length of barrier and moment slab. Internal strength of the barrier is determined using appropriate reinforced concrete design procedures. To preclude the transfer of high impact loads to the. MSE wall panels below the barrier, a 20 mm gap is pro- vided between the throat of the precast barrier and the back side of the& ...


  • the effective length is 6.75 feet. The resulting minimum deck slab thickness per ADOT guidelines is 8.00 inches. In-depth rigorous analysis for deck design is not warranted for ordinary bridges. The empirical design method specified in AASHTO LRFD [9.7.2] is not allowed by ADOT Bridge Group. Therefore the approximate elastic methods specified in [] will be used. Dead load analysis will be based on a strip method using the simplified moment equation of [w S. 2. / 10], for both.