PCI eLearning Course T120: Design Loads and Load Distribution-PCI BDM Ch 9, Part of Design Example, 1a

PCI BDM Ch 9, Part of Design Example, 1a

Pdf Summary

This document is a chapter from the PCI Bridge Design Manual that provides design examples for a bulb-tee beam bridge with a composite deck. The chapter focuses on the design of a single span bridge with specific details and calculations for the cross section, materials, and load combinations.<br /><br />The chapter begins with an introduction and terminology section to familiarize the reader with the design example. It then discusses the materials used in the construction of the bridge, including the concrete slab and precast beams.<br /><br />The document provides calculations for the cross-sectional properties of the beams, including area, moment of inertia, and section modulus. It also calculates the effective flange width and modular ratio between the slab and beam concrete.<br /><br />The chapter then moves on to the analysis of shear forces and bending moments due to dead loads, including the beam weight, slab weight, barrier weight, and wearing surface weight. It provides formulas for calculating these forces and moments at different points along the span, as well as the distribution factors for live loads.<br /><br />The document also covers the dynamic allowance for live loads and provides calculations for shear forces and bending moments due to truck and lane loads. It includes tables displaying the unfactored shear forces and bending moments at various points along the span.<br /><br />Finally, the chapter discusses load combinations for service, strength, and fatigue limit states, and provides the required number of strands based on the stress limits of the concrete.<br /><br />Overall, this chapter provides detailed calculations and analysis for the design of a bulb-tee beam bridge with a composite deck. It covers all aspects of the design process, from materials and cross-section properties to load analysis and strand requirements.

Keywords

PCI Bridge Design Manual

bulb-tee beam bridge

composite deck

design examples

cross section

materials

load combinations

concrete slab

precast beams

cross-sectional properties