Precast concrete girder camber can vary significantly between the time of prestress release and the time of erection. The variations in camber become more significant as the use of high-strength concrete, longer spans, and more heavily prestressed concrete girders continues to increase.
Establishing the Amount of Camber: Beams can be cambered to accommodate part of the dead-load deflection, the full dead-load deflection, or dead-load deflection plus part of the live-load deflection, at the discretion of the engineer. This can be influenced by the relative percentages of dead and live load, the probable fre-
Definition and Calculation of Prestressed Concrete Bridge Camber ...
2021年1月5日 · Chapter 1 summarizes the definition and meaning of a camber, and Chapter 2 categorizes and explains what a camber is. Chapter 3 explains how to calculate the camber of a PSC girder, and in Chapter 4, FSM 2-span PSC girder was used as an example to calculate the ‘stage deflection’ all the way to the ‘shop drawings’ according to Chapter 3.
The camber variation in decked and topped beam elements is a complex issue, as opposed to beams with haunches that are used to account for these variations in girder type bridges. This document focuses on beam systems that do not have haunches.
Design Guide 36: Design Considerations for Camber - AISC
This new guide is intended to assist those designing camber with the information they need to achieve optimal results. The guide’s primary focus is on composite floor beams, and it also includes information on girders, trusses, joists, roof framing, and special considerations.
Effective Strategies for Improving Camber Predictions in Precast ...
2019年3月5日 · In order to limit construction conflicts in bridges with precast, prestressed concrete girders, it is essential that designers are able to predict midspan girder camber with sufficient accuracy at key stages.
Predicting Time-Dependent Deformations of Prestressed Concrete Girders
2021年4月28日 · Camber is the time-dependent upward deflection of a prestressed girder. Initial camber (i.e., camber at transfer) can be observed as soon as the prestressed strands are released (i.e., the prestress transfer) and occurs due to the elastic deformation of concrete, which is sketched as the superposition of dead load and prestressing forces in Fig ...
First standard girder sections developed in 1950s ‐ AASHTO/PCI standard shapes developed to give national standard ‐ Standard shapes needed for efficiency in design and fabrication
Precast, prestressed girder camber variability - PCI
Precast concrete girder camber can vary significantly between the time of prestress release and the time of erection. This occurs even in cases in which two identically prestressed concrete girders are stored in the same manner and erected at the same time.
The purpose of the web camber (WC) is to make the top of girder web approximately parallel to the top of the deck. This results in a uniform depth of fillet, except for fabrication tolerances, and makes for simplification of deck forms. The web camber curve is referenced from a chord linebetween supports. For cantilever