The design life of fiberglass pipe is 50 years. In order to ensure long service life of fiberglass pipe, long-term properties under service conditions is the most important performance. According to the polymer matrix composite material with viscoelastic properties, adopt equivalent principle and shift factors method combined with experiments to study the long term performance of fiberglass pipe, established a relatively simple for fiberglass pipes long-term performance prediction method. The experiments show that compliance of fiberglass pipe with all hoop winding increased by 148% after 50 years in 60% stress level.

Earth pressure can be divided into three kinds of load form by Spangler theory: vertical earth pressure, bed reaction and horizontal lateral pressure. According to Spangler theory, the level of static earth pressure presents a parabolic distribution in central angle bon both sides of the tubes. Used the glass steel pipe as the specific research object, Spangler theory applied to the three-dimensional buried tube model for finite element analysis, the analysis is divided into two situations: (1) the same soil, finite element analysis of different pipe diameter; (2) the same tube diameter, finite element analysis of different soil. This method can reasonably reflect the interaction of soil and structure, it is feasible. The complicated process of the finite element simulation of tube soil interaction can be avoided.

In practical engineering design service life of glass fiber reinforced plastics (GRP) pipes have different requirements. The current specification for different engineering structure design life design only considers the change of variable load. The material properties of GRP pipes can be varied with the service life, which must be considered in the design. Through the analysis of the existing standard design method and principle, the double logarithmic linear extrapolation further promotion, and combine the reduction coefficient method, a simplified design method for GRP pipes of different design service life, which has strong reference significance and application value.

GRP (Glass fiber reinforced plastics) jacking pipe has many advantages, such as lightweight, high strength, corrosion resistance, long life, good hydraulic and so on. The key of GRP jacking pipe is the joints problem. There are two different joints material in GRP jacking pipe: GRP ring and steel ring. The effect of different joints material on the GRP jacking pipe is analyzed by ABAQUS. When the jacking pipe with jacking force, the deflection angle of the pipeline has significant effect on joints force, even if the 0.05° of deflection, the pipe axial compression stress will double. When the jacking pipe without jacking force, joints force related to free deflection angle of the joints. Through comparison the steel ring and GRP ring shows that GRP ring better than steel ring on the ability to withstand deflection.

Creep is one of important properties of polymer matrix composites (PMC).It can be analysis by finite element method (FEM).But creep will be affected by a lot of factors and the creep material parameters are very difficult to be obtained. Shift factors method is one simple method which can be used to obtain the creep properties by fewer tests. Here the basic method analysis of the creep of PMC by FEM was studied. Focus on the analysis of how the material parameters of finite element creep analysis needed to get through the shift factors method. Finally the actual PMC pipe structure is calculated by this method.The error of FEM result and theory result around 2%, the results show that this method has certain rationality and reliability.