What are the real security issues for a wireless sensor network (WSN) intended to monitor the structural health of a suspension bridge, a subway tunnel or a water distribution pipe? Could an attack on the sensor network cause the structure to collapse? How easy is it for civil engineers or other domain experts to build a secure WSN using commercially available hardware and software? We answer t...

Main cables, comprising a number of wire strands, constitute vital element in long-span suspension bridges. The determination their alignment during construction is great importance, and relative sag commonly measured for the efficient adjustment general strands. conventional approach uses caterpillar method, which inconvenient, difficult-to-implement, potentially dangerous. In order to realize...

Deflection is a key index to reflect the bearing capacity and operation situation of bridges. As existing measurements methods have their limitations, this paper tries introduce new method using suspension cable measure deflection This sets supports for dial meters by erecting main cables up longitudinal measuring points on bridge deck. The counterweights limit bars avoids horizontal disturbanc...

A spatially dense wireless sensor network was designed, developed and installed on a long-span suspension bridge for a 3-month deployment to record ambient acceleration. A total 174 sets of data 1.3 GB were collected from 64 sensor nodes on the main span and south tower of the Golden Gate Bridge. Analysis of the vibration data using power spectral densities and peak picking provide approximate ...