Yuao Bridge is a continuous prestressed concrete box beam bridge with 8 spans. Spans are 2×35 + 2×24 + 24.5 + 2×25 + 24.915m. This bridge was constructed by using low box beam with large cantilever, two way prestess, prestressing and tensioning with large tonnage span by span.

The paper states the development and construction characteristics of assembling bridges by precast segments span by span as well as the precast method of segmental beams etc.

In the light of Shanghai Xinliuhe Bridge Project it introduces mainly the design characteristics of precast segmental beams, the application of construction method of using machine for splicing span by span and prestressed new material and new process as well as the analysis of the main testing result of precast segmental beams.

3. A statistic of the construction loads of box girder was done in situ. According to thestatistical results and the construction sequences and applying the high-level analytical technique: death and birth of elements, a construction simulation was carried out.

The Gaoji Strait Bridge in Xiamen(Amoy)adopts a superstructure of continuous prestressed concrete box girders with equal spans of 45m each and the stepping formwork construction method.

This paper briefly describes the calculation principles for the creep coefficient in the GFR-Code 《DIN-4227》. According to the delayed elastic deformation theory, a revised formula of the age-adjusted effective coefficient ρ is derived from the "Age-Adjusted Effective Modulus Method" asUsing the method proposed by the author, the calculation of the sedondary moment due to concrete creep in the continuous girder bridge constructed with the span by span method is analysed and discussed here.The main conclusions...

This paper briefly describes the calculation principles for the creep coefficient in the GFR-Code 《DIN-4227》. According to the delayed elastic deformation theory, a revised formula of the age-adjusted effective coefficient ρ is derived from the "Age-Adjusted Effective Modulus Method" asUsing the method proposed by the author, the calculation of the sedondary moment due to concrete creep in the continuous girder bridge constructed with the span by span method is analysed and discussed here.The main conclusions are as follows:1. The accurate value of the age-adjusted effective coefficient ρ is not necessary in the calculation of the secondary moment due to creep in the continuous girder bridge.2. We suggest that the applicable range of the coefficient p be 0.5 to 0.55 when the load is applied for a short time and 0.6 to 0.7 when applied for a long time.

The Gaoji Strait Bridge in Xiamen(Amoy)adopts a superstructure of continuous prestressed concrete box girders with equal spans of 45m each and the stepping formwork construction method. It uses a substructure of thin-walled rectangular piers and pile foundation.This bridge is the longest straitcrossing one at present in China.

The analysis for concrete creep and shrinkage is a common problem in the bridge structural analysis, and there are many popular methods available now. On the basis of the global incremental equation, this paper presents an automatic incremental creep and shrinkage analysis method which is easy to implement by using the modern computer technology, include its principle and features compared with other methods. Taking the development of the new generation of bridge integrated CAD system——BRCAD as the application...

The analysis for concrete creep and shrinkage is a common problem in the bridge structural analysis, and there are many popular methods available now. On the basis of the global incremental equation, this paper presents an automatic incremental creep and shrinkage analysis method which is easy to implement by using the modern computer technology, include its principle and features compared with other methods. Taking the development of the new generation of bridge integrated CAD system——BRCAD as the application background. This paper gives a brief introduction to the implementation. An example of the creep analysis for a continuous girder bridge constructed with span by span method is also given to prove its accuracy and practicable.