11/29/2022 0 Comments Lrfd beam design![]() Plate Dimensions of the Right Girder (reference Design Step 3.18): Web Thickness:Ĭoncrete Deck Properties (reference Design Step 3.3): Effective Slab Thickness:īased on the concrete deck design example and as illustrated in Figure 2-18, the area of longitudinal deck reinforcing steel in the negative moment region is computed as follows: For the top steel: Plate Dimensions of the Left Girder (reference Design Step 3.18): Web Thickness: Yield Strength:įor Specifications equations requiring the flange yield strength: These properties will be used for the splice plates as well. In Design Step 1.1, the steel properties of the girder were defined. This minimizes the required splice plate thicknesses and the required number of bolts. The Specifications recommends locating splices near points of dead load contraflexure.įield splices are generally located where total moment in the girder is relatively small. The allowable girder shipping length is often a function of the shipping route from the fabrication site to the construction site. The location of the field splice is generally based on economy and includes the following considerations:įield splices are generally located to provide girder segment lengths that do not exceed the allowable girder shipping length. The following units are defined for use in this design example:įor relatively long girders, field splices are generally required to reduce the girder shipping length. This location was determined using the criteria presented in the narrative below. Included in Figure 4-1 is the bolted field splice location. Presented in Figure 4-1 is the final steel girder configuration as designed in Design Step 3. Additional information is presented about the design assumptions, methodology, and criteria for the entire bridge, including the splice. Refer to Design Step 1 for introductory information about this design example. This includes, but is not limited to, defining material properties, identifying relevant superstructure information, and determining the splice location. The first design step is to identify the appropriate design criteria. ![]() The design methods presented throughout the example are meant to be the most widely used in general bridge engineering practice. This splice design example is based on AASHTO LRFD Bridge Design Specifications (through 2002 interims). ![]() LRFD Steel Girder SuperStructure Design Example Bolted Field Splice Design Example Design Step 4 Table of Contents Design Step 4.1 - Obtain Design Criteriaĭesign Step 4.2 - Select Girder Section as Basis for Field Splice Designĭesign Step 4.3 - Compute Flange Splice Design Loadsĭesign Step 4.4 - Design Bottom Flange Spliceĭesign Step 4.5 - Design Top Flange Spliceĭesign Step 4.6 - Compute Web Splice Design Loadsĭesign Step 4.8 - Draw Schematic of Final Bolted Field Splice Design Design Step 4.1 - Obtain Design Criteria ![]()
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