For the purpose of studying the load effect of PC slab bridges under extra-heavy trucks, 883 extra-heavy truck scenarios were extracted based on WIM data from Xuanda highway in Hebei Province. The "bridge dynamic analysis system" was used to calculate the most unfavorable sagging moment of each slab and the maximum sagging moment effect of the bridge. The lateral performance of the slabs was investigated using statistics about the most unfavorable sagging moment of each slab. In addition, the overrun of sagging moment of PC slab bridges was analyzed based on comparison of the maximum sagging moment effect and design value. The results show that owing to the apparent distribution characteristics of extra-heavy trucks, the extreme unfavorable sagging moment of slab 1 was the highest, and the average unfavorable sagging moment of slab 5 was the highest. Under extra-heavy truck load, the overrun problem of sagging moment was universal. Besides, the maximum sagging moment of some scenarios was 1.8 times of the design value. Both the quantity of overrun scenarios and overrun level decreased slightly with the increase of bridge span.

bridge engineering  /  prefabricated PC slab bridge  /  extra-heavy truck load  /  lateral performance analysis  /  overrun analysis