Vehicle Load With Its Reduction Factor Study In Highway Bridge Design

Aimed at developing vehicle load increases and traffic, in order to improve the safety of highway Bridges, economy and practicability, in the latest observation data basis, need targeted re-design of vehicle load reduction factor transverse fold unfold research and calculation.This paper adopts two calculation methods, the first kind of calculation method:the Inner Mongolia arongqi-shenzhen key national highway of ganzhou to set in jiangxi province highway section south of survey data, using probability statistical theory, it is concluded that the total weight of vehicle load observations and largest law between means and standard, the total effect reduction method for folding multi-lanes lateral fold reduction factor calculation formula of repeated independent tests, according to the basic theory of probability, establish lateral fold reduction factor and related variables, it is concluded that the relation between parameters value, again will value inverse into horizontal fold reduction factor formula to calculate lateral fold reduction factor suggested value; The second kind of calculation methods:use 107 national highway Laura hillock section vehicle load measurement, the most unfavorable according to each driveway to the main control models load each driveway, calculates the probability of heavy traffic, and all appear within 24 hours a day calculating the probability of a single driveway appear heavy vehicles, using the formula to calculate the lateral fold reduction factor advisable values. Around two methods of lateral fold calculated respectively with reduction factor in urban-A level and I level JTG the D60 highway transverse comparison and analysis, finally give the suggested value of fold reduction factor.