Since the early 1900s, Malaysian bridges have been built to varying specifications in terms of bridge loading. Due to concerns about the existing bridge's capacity to carry the prevailing traffic load at the time, an axle load study was done in 1987. The study led to the development of the Weight Restriction Order (WRO) 1989 for truck legal axle weights, which is based on the Short Term Axle Load (STAL) policy, which only evaluates HA loads and does not check HB loads. This included all bridges built before 1972 in the United States. The MTAL (Medium Term Axle Load) regulation was later applied in 2003 with the release of WRO 2003. MTAL loadings are obtained from a HA load or a 45-unit HB load steered along the centerline. This included all bridges built in the United States since 1972. Several more studies were also carried out in order to develop Malaysian design loads for bridges. In fact, in 2016, an axle load study was carried out to look at the feasibility of a new axle load policy. The paper proposes a new evaluation load model for evaluating existing bridge carrying capacity. With the issuance of WRO 2017 in 2017, the findings were duly gazetted. Many Malaysian engineers nowadays are unaware of the rationales or foundations for activities, particularly those linked to bridge assessment, because they are unaware of these research. The goal of this study is to go through these studies again and talk about the important decisions that were made about national axle load policies, which were implemented through the issuing of WRO 1989, WRO 2003, and WRO 2017.
Author (s) Details
M. N. Shahruddin
Evenfit Consult Sdn. Bhd., Kuala Lumpur, Malaysia.
C. C. Lim
Jabatan Kerja Raya (JKR), Kuala Lumpur, Malaysia.
S. K. Ng
Evenfit Consult Sdn. Bhd., Kuala Lumpur, Malaysia.
K. M. S. Ku Mahamud
Evenfit Consult Sdn. Bhd., Kuala Lumpur, Malaysia.
M. H. Uzir
Evenfit Consult Sdn. Bhd., Kuala Lumpur, Malaysia.
View Book :- https://stm.bookpi.org/NAER-V8/article/view/2274
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