Comparative studies of live load models for short to medium span lengths bridges in Pakistan
Keywords:
AASHTO LRFD, Actual truck traffic data, Live load model, WIM, WPCPHB.Abstract
In Bridge designing the live loads plays an important role. Most of the developed countries
have their own code for highway bridges design specification while the other countries adopt certain
renowned design codes but with certain additions to meet their demands. In Pakistan, two different codes
are followed for designing of bridges i-e American Association of State Highway and Transportation
Officials and West Pakistan Code of Practice for Highway Bridge. But both of these codes live load
models are not representative of the present truck traffic situation in Pakistan. For this research study,
the MULLA MANSOOR weighing station was selected which is located on Grand Trunk road of Pakistan.
This paper aim is to study the statistical analysis of weigh in motion data and comparative analysis of
short to medium span length typical I girder bridges i-e 10m to 50m with 5m increment. This will help in
comparing the live load effects with the actual truck traffic data for proposing a new live load model in
Pakistan. The method applied for achieving the objectives is based on Line load analysis i-e Load
Resistance Factor Design Equations spreadsheet for bridges design in Pakistan for developing the Live
load model and modification in codes
