ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 04 NO. 04 OCTOBER 2015:

Title:        Calibration factors for aashto lrfd and pakistan code of practice for highway bridges based on statistically analyzed wim loads
Authors:    Hafiz Ullah, Muahammad Fahad, Khan Shahzada, Faizan Akbar
Abstract:   Based on the statistically analyzed Weigh In Motion (WIM) data, WIM Peak recorded data and National Highway Authority (NHA) Pakistan legal load limits a detailed comparison is performed with AASHTO LRFD (HL-93) Loading and Pakistan Code of Practice for Highway Bridges (PCPHB 1967) live load model in order to derive Calibration Factors. A two lane simply supported bridge of span lengths varying from short (20m) to medium (50m) is modeled in Leap CONSPAN; a software developed by Bentley Software, Inc. All the above mentioned loading patterns are applied to the modeled bridge structures to study the live load effects. Based on the results obtained from analysis, Calibration Factor "r" from short to medium spans has been derived both for AASHTO LRFD and PCPHB for the bridge designing in Pakistan. Calibration Factor "r" based on 99.7% confidence level using lognormal statistical distributions for AASHTO LRFD is 1.67 and 1.09 for PCPHB. It means that the AASHTO LRFD and PCPHB live loads should be enhanced by 67% and 9% respectively for the analysis and design of bridges in Pakistan. Calibration Factor "r" when WIM peak loads considered are 2.45 and 1.56 for AASHTO LRFD and PCPHB respectively.  

Keywords:  AASHTO LRFD, Pakistan Code of Practice for Highway Bridges, WIM Loads, Statistically Analyzed WIM Loads, Live load effects comparison, Calibration factors
Pages:      198-206

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