Research on the Bridge Safety Monitoring System Based on Wi-Fi Network Technology

This paper mainly discusses a method based on Wi-Fi network technology cluster bridge safety monitoring system. In bridge safety monitoring center can be displayed at the same time, analysis of many bridge safety monitoring status, is convenient for decision makers to different budgets, optimize regional bridge within cluster maintenance; through the cluster type bridge safety monitoring, can be realized on the spread over a larger area of bridge security state data comparison, unified management, completely changed the previous single bridge safety monitoring system to realize the information sharing between the" information island" situation, more convenient to the regional environment, similar to different bridge structure or different environment, similar to bridge structure safety status of the longitudinal, transverse analysis comparison and research, which is beneficial to promote the optimum design of bridge structure, and based on the bridge maintenance and reinforcement.

Experimental Research on Aerodynamic Characteristics of Bridge Deck at Extreme Attack Angles

Long-span flexible bridges are always challenged by fierce wind load, and the wind with extreme-attack-angle may be a potential danger to threaten the bridge security. The three-component coefficients at extreme attack angles of the section model of one flat streamlined box-girder and central slotted box-girder are investigated through the wind tunnel test, and the detailed explanation are made. The results show that lift and pitch coefficients change approximately linearly between stall angles, and the coefficients display significant nonlinearity and a certain pulsation phenomenon when the attack angle exceeds stall angles, and the stall angles should not be less than ±10° for the sake of the safety of bridges.