01698375

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The most commonly used type of prestressed concrete railroad crossties in North American rely on the bond of steel wires or strands to transfer pretension forces to the concrete. When these crossties are installed in track and subjected to flexural loads, center negative bending is one of the most critical demands. However, the ultimate flexural capacity at the crosstie center is often unknown and difficult to obtain. To address this challenge, this paper presents a predictive mathematical model based on laboratory experimentation data of various common concrete crosstie designs to estimate center negative bending strength of these crossties. This model is developed using stepwise selection of variables using analysis of variance and ordinary least square techniques. The final derived equation uses predictor variables that are easily applied, and the results are adequate for approximations when limited information is available about the crossties’ characteristics and lengthy structural calculations or additional laboratory testing is not practical. For the investigated designs, the maximum prediction error was 6.4%.

This paper was sponsored by TRB committee AR060 Standing Committee on Railway Maintenance.

19-00496

English

4p

2019

Transportation Research Board 98th Annual Meeting

Digital/other

Photos; References; Tables

Concrete ties; Flexural strength; Mathematical models; Mathematical prediction; Pretensioning; Railroad ties

Maintenance and Preservation; Railroads; Vehicles and Equipment

Transportation Research Board Annual Meeting 2019 Paper #19-00496

TRIS, TRB, ATRI

Dec 7 2018 9:53AM