|Table of Contents|

Internal force state of long-span continuous rigid-frame bridge with high-rise piers and its effect on seismic response(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2022年01期
Page:
70-81
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Internal force state of long-span continuous rigid-frame bridge with high-rise piers and its effect on seismic response
Author(s):
SHI Yan1;  LI Jun1;  QIN Hong-guo1;  LI Ping1;  ZHENG Guo-zu1;  WANG Dong-sheng2
(1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; 2. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China)
Keywords:
bridge engineering;  continuous rigid-frame bridge;  equivalent load method;  construction process;  internal force state;  seismic response
PACS:
U448.23
DOI:
10.19818/j.cnki.1671-1637.2022.01.005
Abstract:
An analysis model was established to study the effects of actual construction process and concrete shrinkage and creep on the internal force state of continuous rigid-frame bridge to determine the differences in seismic responses of the main bridge under different internal force states. The model was established taking a long-span continuous rigid-frame bridge with high-rise pier as the background, through MIDAS/Civil, and the effects of each construction factor on the internal force state of the main bridge were discussed. Based on the equivalent load method, the calculation formulas of internal force equivalent loads were proposed for continuous rigid-frame bridges. The internal forces of the main bridge were decomposed. Several simple internal force equivalent loads were used for equivalence, followed by the summation using the superposition principle to obtain the equivalent internal force state corresponding to the actual situation. The nonlinear dynamic analysis model of the completed bridge was established through the OpenSees, and the internal force equivalent loads corresponding to different internal force states were applied to enable the positioning of the corresponding equivalent internal force states. Forty groups of typical near-fault ground motion records with velocity pulse effect were selected as the input. The nonlinear dynamic time-history analysis of the completed bridge was carried out under different internal force states. Analysis results show that with the prestress of the main bridge ignored, the maximum bending moment of the main girder is overestimated by about 2.8 times, and the maximum bending moments of the top and bottom of the main pier are overestimated by about 3.5 and 2.0 times, respectively, with the bending moment in reverse direction to the actual situation. Therefore, the influence of prestress on the internal force state of continuous rigid-frame bridge cannot be ignored. The maximum error between the peak value of the equivalent internal force of the main girder and that of the target internal force near the pier-beam consolidation is less than 5%. Under the action of near-fault ground motions, the drift angle of main pier, curvature ductility factor, and maximum strain of reinforcement in plastic hinge area all display decreasing trends with the increase of concrete shrinkage and creep, especially detectable along the longitudinal direction of the bridge. The proposed calculation method of equivalent internal force loads can provide a reference for the seismic design and performance evaluation of continuous rigid-frame bridges in high intensity areas. 4 tabs, 12 figs, 30 refs.

References:

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Last Update: 2022-03-20