Bridge effective prestress monitoring method based on distributed optical fiber technology

• Main Authors: XIAO JINJUN, GUO CUICUI, MEI XIUDAO, LUO GUOMIN, WANG MINGHUI, YE ZHONGTAO, HUANG XINMING, WANG JINXIA, DENG TONG, HU JUNLIANG, LIU KAI, XIE SHANHAI
• Format: Patent
• Language: Chinese; English
• Published: 29.10.2021
• Subjects: MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; PHYSICS; TESTING

The invention relates to a bridge effective prestress monitoring method based on a distributed optical fiber technology. The method comprises the following steps of arranging distributed strain optical fibers at the bottom of a to-be-monitored bridge in the longitudinal direction; enabling a vehicle to pass through the to-be-monitored bridge, and calculating the stress sigma1 of a measuring point of the to-be-monitored bridge under the combined action of live load and dead load at the initial monitoring stage; meanwhile, according to an initial strain time history curve of a measuring point acquired by the distributed strain optical fiber, calculating an initial peak stress sigma of the measuring point; enabling the vehicle to pass through the to-be-monitored bridge every preset time, acquiring a real-time strain time travel curve of the measuring point according to the distributed strain optical fiber, and calculating a real-time peak stress sigma' of the measuring point; and according to the stress sigma1,