Analysis On Mechanical Characteristics Of Single-box Multi-cell Girder Extradosed Cable-stayed Bridge With Corrugated Steel Webs

Extradosed cable-stayed bridge with prestressed concrete box girder with corrugated steel webs has the advantages both of normal extradosed cable-stayed bridge and normal prestressed concrete box girder bridge with corrugated steel webs.It can increase the spanning capacity of general prestressed concrete box girder bridge with corrugated steel webs.It has obvious advantages in these areas,such as the cracking resistance of the web,the set of prestressing system, power transmission path of the concrete roof,concrete floor and web and so on.This kind of structure will be used widely.At present, the domestic and foreign scholars have done less research on extradosed cable-stayed bridge with prestressed concrete box girder with corrugated steel webs,the study of girders mostly are 1-cell single box or 2-cell single box girder,the study of single-box multi-cell girder is less.This article based on Chaoyang ditch bridge which main span is 188 meters and it is a 4-cell single box extradosed cable-stayed bridge with corrugated steel webs,using the large finite element software Midas/Civil and Midas/FEA to built the theoretical analysis model to study the mechanical properties,the rusults can provide theoretical support and reference for the similar bridge’s design and construction. The main work has the following several aspects.(1) Using the large finite element software Midas/Civil and Midas/FEA to built the beam element model and solid element model. The model should be able to accurately simulate the cable tension, concrete roof and floor,corrugated steel webs and prestressed reinforcement and the connections between them;(2) Based on the Unknown Load Coefficient method,calculate the reasonable state of completed bridge of chaoyang ditch bridge and check that if it is reasonable for chaoyang ditch bridge;Calculate the reasonable construction state of chaoyang ditch bridge.At the same time,calculate and analysis the main Control parameters in the construction process of the stay cables’ tension, the construction camber, the secondary cable force,the displacement of tower and girder in construction process, the maximum stress of the box girder’s roof and floor, etc.(3) Analyze the dynamic analysis of chaoyang ditch bridge to learn the dynamic characteristics;Study the time-history analysis of chaoyang ditch bridge,analyze the seismic performance of this type bridge.