The results show that in terms of space curved beam,tensioned prestress has a greater torque effect and the torsional stability of curved girder bridges is mainly reflected in the curved beam deformation and the reaction force on bearings,so it needs to set a reasonable form of support to ensure the torsional stability of the main beam.

In order to develop an effective analytical and monitoring method in breeding rice varieties with higher resistance stability to brown planthopper (BPH), Tai’s method (1971) was employed to estimate the resistance stability of twelve rice varieties to different biotypes of BPH.