Method and system for three-directional displacement monitoring of building by fusion of InSAR data and physical knowledge

A method for three-directional displacement monitoring of a building by InSAR data and physical knowledge, comprising the steps of:

• step 1, acquiring, by a processor, a time-series LOS-directional deformation displacement of a region of study, where a building to be monitored is located, from each orbit based on periodical observation data of an SAR satellite;
• step 2, calculating, by the processor, time-unified LOS-directional time-series deformations from a plurality of orbits by performing time-dimensional interpolation on LOS-directional deformation datasets from ascending and descending orbits respectively;
• step 3, solving, by the processor, deformations in vertical and east-west directions by establishing an observation equation based on interpolated multi-orbital LOS-directional deformations;
• step 4, calculating, by the processor, major-axis stiffness and minor-axis stiffness of each standard storey of a building structure according to a building structure plan;
• wherein overall lateral stiffness of a structural storey comprises shear stiffness of a shear wall and flexural stiffness of a column member;
• step 5, calculating, by the processor, a ratio of a major-axis-directional deformation to a minor-axis-directional deformation by establishing a priori model of the building structure using physical knowledge of an Equivalent Lateral Force method and based on the building structure plan;
• and
• step 6, solving, by the processor, a deformation displacement of the building structure in a north-south direction in combination with deformation results in the vertical and east-west directions and the priori model of building structure deformations;
• wherein in step 5, each storey of the building structure is regarded as an independent mass point, and according to the Equivalent Lateral Force method, a horizontal seismic action on a mass point of an ith storey is
• F
• i
• =
• H
• i
• ⁢
• G
• i
• ∑
• k
• =
• 1
• n
• H
• k
• ⁢
• G
• k
• ⁢
• F
• Ek
• (
• 1
• -
• δ
• n
• )
• ,
• in which Hi and Hk indicate calculated heights of mass points, Gi and Gk indicate gravity load values of the mass points, FEk indicates a standard value of a total horizontal seismic action of the structure, n indicates a total number of storeys of the structure, and δn indicates a top-added seismic action coefficient;
• and
• a horizontal deformation of each storey is defined as a ratio of a horizontal shear to the stiffness of the storey, a deformation at a top of the building is a sum of deformations of respective storeys, a minor-axis deformation at the top of the building is
• Δ
• ⁢
• x
• =
• ∑
• i
• =
• 1
• n
• F
• i
• K
• ix
• ,
• and a major-axis deformation at the top of the building is
• Δ
• ⁢
• y
• =
• ∑
• i
• =
• 1
• n
• F
• i
• K
• iy
• ,
• in which Kix and Kiy indicate the minor-axis and major-axis stiffness of an ith storey,
• wherein the method for three-directional displacement monitoring of the building by InSAR data and physical knowledge is utilized to prevent a safety hazard of the building caused by a three-dimensional deformation,
• wherein a direct contact with the building is not required during step 1 to step 6, such that influence and damage to the building structure are avoided, thereby safety of the building is guaranteed.