A model for a prestressed concrete cable-stayed bridge with a II cross-section main girder was established in a scale of one to five for a concrete cable-stayed bridge over the Jinsha River in Yibin City. The shear lag effect of this bridge was analyzed experimentally and was compared with the one obtained with the finite element method. The comparison shows the reliability of the experiment. The experimental result shows that for a cable-stayed bridge with a Πcross-section main girder, shear lag factor is greater at the fixed ends of its cantilevers than at its mid-span.
[ Shan, Deshan ] Bridge Engineering Department, Civil Engineering School, Southwest Jiaotong University, Chengdu, Sichuan Province, 610031, China;[ Weng, Yan ] School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyan, Sichuan Province, 621010, China;[Li, Qiao ] Civil Engineering School, Southwest Jiaotong University, Chengdu, Sichuan Province, 610031, China
Analytic hierarchy - Bridge performance - Development tools - Evaluation models - Existing concrete bridge - Existing concrete bridges - Group decision - Judgment matrix - Multiple comparison - NET framework - Performance assessment - Performance evaluation - Single element - Visual studios
The performance assessment of existing concrete cable-stayed bridge is discussed in this paper. These assessment indexes are classified into qualitative indexes, quantitative indexes and measurable group indexes. Analytic hierarchy process method is adopted to evaluate the qualitative indexes. Based on the experts' investigation, the judgment matrix of multiple comparisons is carried out, and the weight of single element is figured out and judgment consistency is checked, then group decision method is employed to calculate the judgment results of all experts. The corresponding assessment software is complied on the .net framework 2.0 aided by the powerful development tool of visual studio 2005 C#. One certain concrete cable-stayed bridge with single pylon is inspected and assessed by the proposed method in this paper. The result suggests that the proposed method can be applied in the real bridge performance assessment. Copyright ASCE 2009.
In this paper, a dynamic analysis of light-rail-station viaduct under moving vehicles is presented. Moving vehicles are idealized as moving load-sequence. The overhead and multi-stories' light-rail-stati on viaduct is modeled by the three-dimensional finite element model. Then when applying the time-integration to the dynamic system, the equations of motion are efficiently solved based on these models. The proposed structure is then applied to a real overhead and multi-stories light-rail-station viaduct with a group of moving vehicles. The braking forces, attractive forces and lateral sway forces are also taken into accounts which correspond with the accelerated and decelerated processes of moving vehicles when they enter and depart the station. The dynamic responses of the light-rail-station viaduct and the riding comfort indices are computed. The results show that the formulation presented in this paper can efficiently and effectively predict the dynamic response of light-rail-stations viaducts under a normal operation condition.