This paper takes the double-curved arch bridge as research object; mainly research several problems on how to examine the upper structure of the existing double-curved arch bridges.

Strengthening analysis of the double arch bridge after cracking;

Theory and method of reinforcement of double arch bridge;

Damages analysis and reinforcement of existing reinforced concrete double-curved arch bridges;

Static-state load test and structure analysis of existing double-curved arch bridge;

On technological research on the addition of longitudinal beam strengthening pile double-curved arch bridge and its practice

Research of evaluation and reinforcing skill on double-curve arch bridge;

Through the analysis and summarization of the demolishing course of Macha River Bridge in Ningtong Highway, the article preliminarily approaches the technical gist safely to demolish the steel reinforced concrete double-curve arch bridge.

Taking one 4-span steel reinforced concrete open spandrel double-curve arch bridge as an example, and combined with the investigation and study of the typical disease of the double-curve arch bridge at present and the evaluation method of the old bridge bearing capacity at home and abroad, the overall health examination is carried out for the bridge.

Common diseases of double curved arch bridge and renovation technique;

Stick steel strengthening structure optimization research of dangerous and old double curved arch bridge;

The paper applies the beam unit in ANSYS software to establish the forced model of double curved arch bridge based on the actual measurement data.

The article studies the bearing capacity of two-way curved arch bridge based on the upper structure checking method.

The old Guokeng Bridge in Zhangzhou,Fujian Province is an open spandrel,cate-(narian) two-way curved arch bridge with constant sections.