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1、NJDOT Design Manual for Bridges and Structures 1.44-1 Alternative Design Criteria, Non Federal Aid Highways, Off System Bridges SECTION 44 ALTERNATIVE DESIGN CRITERIA NON-FEDERAL AID HIGHWAYS As an alternative to the overall design policy requirements of this Manual, the current AASHTO Standard Spec
2、ifications for Highway Bridges, except for the modifications noted below, are required as absolute minimum design specifications for Non-Federal Aid Highway bridges with projected ADTT up to 500. A Non-Federal Aid Highway is any highway that is classified as a Local Road or Rural Minor Collector. 1.
3、44.1 ALTERNATIVE DESIGN CRITERIA - (NON - FEDERAL AID HIGHWAY BRIDGES WITH PROJECTED ADTT TO 500) 1.The following Sections of the AASHTO Standard Specifications for Highway Bridges, as modified by Section 3 of the this Manual, shall be followed. However, the Load requirements shall only be increased
4、 by 10% instead of 25%. Section 3 - Loads 3.7.2-Classes of Loading 3.7.3 -Designation of Loading 3.7.4-Minimum Loading 3.24 -Distribution of Loads & Design of Concrete Slabs 3.25 -Distribution of Wheel Loads on Timber Flooring 3.29 -Moments, Shears and Reactions Section 9 - Prestressed Concrete 9.13
5、.1 -Design Theory and General Considerations 9.15 -Allowable Stresses Section 10 - Structural Steel 10.6 -Deflection 10.14 -Camber 10.23 -Welding 2.Article 10.3.2.1 of AASHTO and the changes to this article that are made by the NJDOT Design Manual shall be modified as follows: NJDOT Design Manual fo
6、r Bridges and Structures 1.44-2 Alternative Design Criteria, Non Federal Aid Highways, Off System Bridges The number of cycles of maximum stress range to be considered in the design shall be Case II from Table 10.3.2A for all vehicular bridges regardless of type of road. 3.Other considerations that
7、are applicable to the alternative design criteria are as follows: a.Design shall be made with reference to service loads and allowable stresses provided in Service Load Design (Working Stress Design) Criteria. b.Bridge geometry shall be in accordance with AASHTO or FHWA approved 3R Standards where a
8、pplicable. 4.The 1996 Standard Specifications for Road and Bridge Construction shall be used in conjunction with Special Provision requirements. 5.Beyond these requirements, the AASHTO Standard Specifications may be followed. The alternative design criteria or the overall design policy of this Manua
9、l, is to be used at the option of the local authority. 1.44.2 DECK SLAB THICKNESS AND REINFORCEMENT STEEL TABLES FOR ALTERNATIVE DESIGN CRITERIA 1.The following table for one course construction meets the MS18 + 10% alternative live load criteria for Non Federal Aid Highway bridges with projected AD
10、TT to 500. 2.This table, based on 65 millimeters top cover, 25 millimeters bottom cover, and rebars perpendicular to traffic with fc = 9.8 megapascals and fs = 165 megapascals, has been prepared in order to establish uniformity in design and details. However, the designer shall develop the design of
11、 the slab for each bridge and the calculations shall be included in the design folder. ONE COURSE CONSTRUCTION NJDOT Design Manual for Bridges and Structures 1.44-3 Alternative Design Criteria, Non Federal Aid Highways, Off System Bridges FOR DESIGN LIVE LOADING MS18 + 10% EFFECTIVE SLAB SPAN (S) SL
12、AB THICKNESSREINFORCEMENT STEEL (TOP & BOTTOM) 1.22 m to 1.60 m215 mm# 16 200 mm 1.60 m to 1.85 m215 mm# 16 175 mm 1.85 m to 2.04 m215 mm# 19 225 mm 2.04 m to 2.27 m215 mm# 19 175 mm 2.27 m to 2.40 m215 mm# 19 150 mm 2.40 m to 2.55 m220 mm# 19 150 mm 2.55 m to 2.69 m225 mm# 19 150 mm 2.69 m to 2.84 m230 mm# 19 150 mm 2.84 m to 2.00 m235 mm# 19 150 mm 2.99 m to 3.13 m240 mm# 19 150 mm 3.13 m to 3.28 m245 mm# 19 150 mm 3.28 m to 3.42 m250 mm# 19 150 mm