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The dwarf tower cable-stayed bridge seismic response analysis and mitigation and isolation

Author: ChenZhuo
Tutor: YuXiangDong
School: Central South University
Course: Civil Engineering
Keywords: Extradossed bridges Response spectrum Time history analysis Seismic performance Lead rubber bearings Mitigation and isolation
CLC: U442.55
Type: Master's thesis
Year: 2011
Downloads: 53
Quote: 0
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Abstract


Low tower cable-stayed bridge is the structure of the rise of a new bridge in the last 20 years, and its structure by force performance between the cable-stayed bridge with continuous beam bridge. Seismic response and mitigation and isolation of this bridge type (especially Single Tower and Cable surface low tower cable-stayed bridge) is still in its infancy. This bridge type dynamic characteristics and mitigation and isolation methods, to provide the basis and reference for its seismic design, it is a rewarding job. Quartet Bridge to Suijiang County engineering background, scale finite element analysis software SAP2000 to conduct the following research: (1) establish a computational model of spatial beam elements and plate elements, comparison of the two models from the vibration characteristics found: two model is basically the same as the first 4 modes, and for bending modes, the frequency error does not exceed 1.6%; fifth order of the plate elements appear torsional modes, the dynamic characteristics of the two models after some differences . Calculated taking into account the relationship of purpose computational efficiency, this choice of the space board unit model as Dynamic characteristics analysis model selection backbone model for the overall seismic analysis response spectrum and nonlinear time history analysis. (2) through a series of major structural control parameters (support conditions, the cable, the main beam height span ratio) sensitivity analysis of the dynamic characteristics of the bridge Quartet. The results show that: the consolidation of the connection in the form of pier beam is more favorable for the Quartet bridge seismic; cable-stayed less dynamic characteristics; the main girder span ratio is mainly reflected in the main beam vertical bending and torsional vibration mode on. (3) using the response spectrum analysis of the seismic response of the bridge E1. Discusses the input to determine the principles, the impact of higher modes of vibration, modal uncoupling effect and the effect of the pile and soil. Response spectra calculated results show that the member of the Quartet bridge the E1 seismic effect in elastic stage. (4) time history analysis parameters selected, based on the Quartet bridge seismic standards under the various components of the bridge E2 earthquake time history seismic check, the results showed that: under rare earthquake, in addition to support other components are in the outside of the seat can not meet the seismic performance requirements, flexible working stage. (5) selection of a series of models of lead-rubber seismic bearings and bridge mitigation and isolation. The results show that: the addition of lead rubber bearings, you can very significantly improve the pier and pile cap longitudinal and the main aspect of the tower to the force of circumstances, but different aspect to the isolation effect. The pier stiffness increases to a certain extent, the pier bottom internal forces basically stable. The lateral seismic performance of little significance to improve the bridge from the increase tetragonal bridge pier stiffness angles conclusions. Finally, according to the main components of the actual bridge cross the longitudinal seismic capacity demand than the latter can be integrated to select the seismic bearing models, in order to achieve the purpose of further reduced by reducing the piers internal forces pier-section reinforced dosage to obtain better economic benefits.

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CLC: > Transportation > Road transport > Bridges and Culverts > Investigation, design and calculation > Bridge Design > Damage Analysis and Seismic Design
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