Research On Asphalt Deck Of Binzhou Three-Cable-Stayed Bridge Over Yellow River

Yellow River bridge for expressway in Binzhou is a unique triple pylon cable stayed bridge on Yellow River, the structure is subjected to complicated stress, the region it is in has high traffic volume and more heavy vehicles, the weather is hot and wet in summer and chill in winter, so it is strict with the performance of bridge deck, which affect the safety and riding comfort directly. This paper did some systemic study on bridge deck with the method of spot inquisition, technical analysis, experimental investigation and the combination of construction technology and quality control index.Firstly, the paper based on the analysis of deck outcome both here and abroad presents research content, method and technique route of deck pavement of Yellow River Bridge in Binzhou.Secondly, basing on the investigation of damage styles and reasons of deck pavement, the paper presents the measure of how to avoid the damage styles existing, analyzes the layers performance of deck pavement subjected to stress with three dimensional finite-element method, points out the worst position of bituminous pavement course and water-proof binder coat under vehicle, compares pavement condition subjected to stress under different thickness combination and modulus combination, states proper thickness and modulus ranges. Vehicle load is simplified as moving symmetrically distributed load; the influenceable rule in response to the most stress in the deck averment course is calculated in the condition of variable vehicle steering velocity. In the condition of the brake, variability of horizontal shear stress in different depth and the influence of horizontal stress with variable horizontal stress index are researched. The control index of maximum tension stress and shear stress are brought forward by analyzing calculated results.Thirdly, the performance of fiber reinforced bitumen concrete, SMA and water-proof binder coat are studied with laboratory experiment, and the paper gives theory foundation of selecting proper pavement materials. Meanwhile, the author does textural association test with compound beam to compare the fatigue life of different kinds of deck pavement structure, evaluates fatigue property of every textural association style, and selects proper depth of each pavement course, proper water-proof binder coat and textural association of deck pavement for Yellow River bridge in Binzhou .Fourthly, the paper presents the study on mix design, construction machinery association and project quality control of pavement course and presents that the influence of vibratory road roller on bridge structure safety is feeble, so vibratory road roller can be used in pavement course construction process. At the same time, construction guide opinion is presented in order to ensure the pavement satisfy the research objective and quality index.The research results of this paper indicate that it can increase the performance of anti-rutting, anti-water damage, anti-fatigue and prevent premature failure to use high dosage SBS-modified asphalt as waterproof cohesive layer, SMA13 and fiber reinforced asphalt concrete as pavement course. This paper also presents theoretical reference and practical guide for studying deck pavement structure of long-span prestressed concrete bridge deck pavement.