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Experimental investigation for concrete cablestayed bridges with longspan(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2019年05期
Page:
78-87
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Experimental investigation for concrete cablestayed bridges with longspan
Author(s):
LIU Yun;  YUAN Ming; YAN Donghuang
(1. School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China；〖JP〗 2. School of Road and Bridge Engineering, Hunan Communication Polytechnic, Changsha 410132, Hunan, China)
Keywords:
bridge engineering;  nonlinear;  localglobal model;  concrete cablestayed bridge;  cable free zone;  elastic supporter
PACS:
-
DOI:
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Abstract:
A nonlinear localglobal design method test for concrete cablestayed bridges was proposed, to simulate the spatial structural behavior while considering both the model space and test accuracy, and to reflect the overall mechanical characteristics of cablestayed bridges. The midspan region of main girder with the strongest plasticity was selected as the test section. A cablefree zone was set at both ends of the segment, and an elastic support was applied， to simulate the stress states of the original structure at its boundaries and eliminate simulation errors. The length of the cablefree zone and the stiffness of the elastic support at both ends were adjusted， until the control section and the internal force increment of the control cable under external loads of the test beam were consistent with the original structure. This adjustment was made to reflect the mechanical characteristics of the entire structure correctly. The scale ratio was determined, the test beam section and the spring support were constructed, the loading condition was designed, and the loading test was completed with the crack width of the concrete as the control index. Next, the calculation and measurement results for the control sections of the local section and the entire model were compared. The results show that during the elastic period, the segmental model is consistent with the actual bridge. The loaddeflection and loadcable force curves of the main girder after cracking are close to each other, and the segmental model better reflects the stress state of the actual bridge in this area. The proposed method effectively simulates the nonlinear character of local cablestayed bridges as well as their internal force redistribution. The initial crack position on the main beam of the cablestayed bridge is near the concentrated force loading point. The crack gradually expands to the vicinity of the loading point, and the maximum crack width increases slowly. The development of the concrete compressive strain and the increase in the cable force are also relatively slow. The total stiffness of the concrete cablestayed bridge decreases slightly after the cracking of the main girder. There is a significant internal force redistribution in the entire structure, and the ultimate load of the structure is increased. 4 tabs, 13 figs, 25 refs.

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Last Update: 2019-10-16