钢壳混凝土沉管组合结构徐变和收缩性能研究

以深圳到中山预投标的钢壳混凝土沉管隧道工程为例,针对钢壳混凝土沉管的组成形式,借鉴已有的钢-混凝土组合结构在收缩和徐变作用下的变形研究成果,对钢壳混凝土结构在长期作用下的受力和变形情况进行研究,采用一种简捷的计算方法对沉管横向结构在长期作用下的受力和变形情况进行计算.结果表明:由于徐变和收缩的影响,混凝土最终将近退去一半的应力值;钢壳的受力随着徐变和收缩的发展趋于均匀;随着收缩徐变的发生钢壳所承担的弯矩逐渐减小;由于徐变和收缩导致挠度增量的影响并不大.

Creep and shrinkage of steel and concrete composite immersed tunnel

Taking the steel and concrete composite immersed tunnel pre-bidding project from Shenzhen to Zhongshan as an example,aiming at the construction characteristics of the steel and concrete composite immersed tunnel,we draw on the stress and deformation research on creep and shrinkage effect of steel and concrete composite beams,and study the stress and deformation of steel shell concrete structure in the long term effects.We calculate the stress and deformation of transverse structure of immersed tunnel in long-term effects by an easy method.The results show that the concrete lost almost half of the stress because of the creep and shrinkage.The stress of the steel casing tends to be uniform with the development of the creep and shrinkage.The bending moment of the steel casing is getting decrease with the development of the creep and shrinkage.The increase of deflection due to the effect of creep and contraction is not significant.