MEASURING METHOD AND APPARATUS OF BRIDGE DISPLACEMENT BY MEASURE OF STRAIN

摘要

PURPOSE: A method for measuring the displacement of a rod bridge structure using a strain measurement and a device for measuring the displacement of the rod bridge structure are provided to accurately measure the displacement of an upper structure even under an environment hard to directly measure displacement without bad influences to surroundings. CONSTITUTION: A method for measuring the displacement of a rod bridge structure using a strain measurement is as follows. Strains at a plurality of measuring points of a structure are measured by a strain gauge(1)(S1). Influence coefficients of moment caused by a unit load with respect to each measuring point is calculated by using an equation(S2). Flexible coefficients of a strain-equivalent load with respect to each measuring point are calculated and a rigidity coefficient of the strain-equivalent load is calculated from an inverse matrix(S3). Rigidity matrixes with respect to each measuring point of a portion of the structure between the measurement point adjacent to a corresponding measuring point are calculated(S4-1). The rigidity matrix with respect to a whole structure is calculated by overlapping the obtained rigidity matrixes with respect to each measuring point and a flexible matrix which is an inverse matrix is calculated by using the same(S4-2). [Reference numerals] (S1) Measuring a strain rate(∈n) by a strain gauge(1) of a structure; (S2) Calculating an influence coefficient(e_ij) by a unit load; (S3) Calculating a flexibility coefficient(f_ij) and a rigidity modulus(K_ij) of a strain rate-equivalent load; (S4-1) Calculating a rigidity matrix equation per each measurement point; (S4-2) Calculating rigidity and flexibility matrix equations of an entire structure; (S5) Calculating the displacement of a strain rate-displacement relation