A real-time,long-round global positioning system (GPS) bridge-deformation monitoring technology was proposed,which processes the carrier phase of multiple GPS receivers in an operation center.It was demon- strated an ...A real-time,long-round global positioning system (GPS) bridge-deformation monitoring technology was proposed,which processes the carrier phase of multiple GPS receivers in an operation center.It was demon- strated an extended Kalman filter with triple differential ionospheric-free measurement (EKF-TIF) which can eliminate the ionospheric delay,whiten the TIF noise and optimize the results of EKF,consequently,achieves a better performance than existing real time kinematic (RTK) solution.An experiment,which takes an active ionosphere condition into consideration,proves the feasibility of this system by comparing its records to that of a traditional RTK solution,practically,the system installed on the Donghai Bridge has survived a non-break running for five months.The analysis to the monitoring records shows the system achieves the designed accu- racy and reliability.展开更多
The Emerging Timber Bridge Program to Sao Paulo state （ETBPSP） was started in 2001 with the main objective of research and development of new technologies for timber bridge construction. After five years of this pro...The Emerging Timber Bridge Program to Sao Paulo state （ETBPSP） was started in 2001 with the main objective of research and development of new technologies for timber bridge construction. After five years of this program eleven demonstration timber bridges were constructed in the State of Sao Paulo, whereas eight composite timber/concrete bridges, one log timber girder bridge with transversal sawn deck, one transversal lumber prestressed timber bridge and one transversal cellular plywood box prestressed bridge. As a final objective is the divulgation of the constructive and structural systems in extension courses to municipal engineers and in a complete publication of timber bridges project plans with the different structural and constructional systems. This paper describes the goals of the MTBPSP, the accomplishments of the program in the first five years, the information sheet of the bridges and outlines some obstacles and opportunities.展开更多
文摘A real-time,long-round global positioning system (GPS) bridge-deformation monitoring technology was proposed,which processes the carrier phase of multiple GPS receivers in an operation center.It was demon- strated an extended Kalman filter with triple differential ionospheric-free measurement (EKF-TIF) which can eliminate the ionospheric delay,whiten the TIF noise and optimize the results of EKF,consequently,achieves a better performance than existing real time kinematic (RTK) solution.An experiment,which takes an active ionosphere condition into consideration,proves the feasibility of this system by comparing its records to that of a traditional RTK solution,practically,the system installed on the Donghai Bridge has survived a non-break running for five months.The analysis to the monitoring records shows the system achieves the designed accu- racy and reliability.
文摘The Emerging Timber Bridge Program to Sao Paulo state （ETBPSP） was started in 2001 with the main objective of research and development of new technologies for timber bridge construction. After five years of this program eleven demonstration timber bridges were constructed in the State of Sao Paulo, whereas eight composite timber/concrete bridges, one log timber girder bridge with transversal sawn deck, one transversal lumber prestressed timber bridge and one transversal cellular plywood box prestressed bridge. As a final objective is the divulgation of the constructive and structural systems in extension courses to municipal engineers and in a complete publication of timber bridges project plans with the different structural and constructional systems. This paper describes the goals of the MTBPSP, the accomplishments of the program in the first five years, the information sheet of the bridges and outlines some obstacles and opportunities.
