可提离式桩基础规则连续梁桥的地震响应分析
发布时间：2019-05-11 16:44
【摘要】：以上海嘉闵高架桥为依托,利用Open Sees软件构建有限元分析模型进行非线性时程分析,对两种不同基础体系下的规则连续梁桥的主梁、墩柱、基础等的地震响应进行对比分析,并考虑墩高变化的影响。结果表明:基础提离设计,相较常规基础设计,会显著降低墩柱的纵、横向弯矩响应,改善墩柱的受力性能,纵向降幅为20.4%~32.0%,横向降幅为2.5%~23.8%;单桩的纵向弯矩响应减小,降幅达16.2%~40.0%;桩基最大拉力受到有效控制。基于新规范体系,评估了墩柱和基础在E2地震下的抗震性能,结果表明采用提离式桩基础的规则梁桥可有效降低墩柱、基础的地震需求。在E2地震下,墩柱均处于弹性状态,单桩配筋率相较常规基础体系梁桥可随墩高增加适当降低。
[Abstract]:Based on the Shanghai Jiamin Viaduct, the finite element analysis model is constructed by Open Sees software to carry on the nonlinear time history analysis, and the seismic response of the main beam, pier column and foundation of the regular continuous beam bridge under two different foundation systems is compared and analyzed. The influence of pier height variation is also considered. The results show that compared with the conventional foundation design, the longitudinal and transverse bending moment response of the pier column can be significantly reduced, and the mechanical properties of the pier column will be improved by 20.4% to 32.0% in longitudinal direction and 2.5% to 23.8% in transverse direction, the results show that compared with the conventional foundation design, the longitudinal and transverse bending moment responses of the pier column are significantly reduced and the mechanical properties of the pier column are improved. The longitudinal bending moment response of single pile decreases by 16.2% / 40.0%, and the maximum tensile force of pile foundation is controlled effectively. Based on the new code system, the seismic performance of pier-column and foundation under E _ 2 earthquake is evaluated. The results show that the seismic demand of pier-column and foundation can be effectively reduced by using regular beam bridge with lift-off pile foundation. Under E2 earthquake, the pier and column are in elastic state, and the reinforcement ratio of single pile is lower than that of the conventional foundation system beam bridge with the increase of pier height.
【作者单位】： 上海理工大学环境与建筑学院;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(51408359,51378384)
【分类号】：U442.55
[Abstract]:Based on the Shanghai Jiamin Viaduct, the finite element analysis model is constructed by Open Sees software to carry on the nonlinear time history analysis, and the seismic response of the main beam, pier column and foundation of the regular continuous beam bridge under two different foundation systems is compared and analyzed. The influence of pier height variation is also considered. The results show that compared with the conventional foundation design, the longitudinal and transverse bending moment response of the pier column can be significantly reduced, and the mechanical properties of the pier column will be improved by 20.4% to 32.0% in longitudinal direction and 2.5% to 23.8% in transverse direction, the results show that compared with the conventional foundation design, the longitudinal and transverse bending moment responses of the pier column are significantly reduced and the mechanical properties of the pier column are improved. The longitudinal bending moment response of single pile decreases by 16.2% / 40.0%, and the maximum tensile force of pile foundation is controlled effectively. Based on the new code system, the seismic performance of pier-column and foundation under E _ 2 earthquake is evaluated. The results show that the seismic demand of pier-column and foundation can be effectively reduced by using regular beam bridge with lift-off pile foundation. Under E2 earthquake, the pier and column are in elastic state, and the reinforcement ratio of single pile is lower than that of the conventional foundation system beam bridge with the increase of pier height.
【作者单位】： 上海理工大学环境与建筑学院;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(51408359,51378384)
【分类号】：U442.55
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