| 曲线桥梁墩高参数动力敏感性研究 |
| |
| 引用本文： | 程麦理.曲线桥梁墩高参数动力敏感性研究[J].西北地震学报,2020,42(1):15-21. |
| |
| 作者姓名： | 程麦理 |
| |
| 作者单位： | 延安大学建筑工程学院, 陕西 延安 716000 |
| |
| 基金项目： | 国家自然科学基金项目（51408453，51808479）；延安大学博士科研启动项目（YDBK2016-08）；陕西省自然科学基础研究计划资助项目（2018JQ5217）；延安大学校级科研计划项目引导项目（YDY2017-11）。 |
| |
| 摘 要： | 为研究曲线桥梁结构桥墩高度参数对地震响应的敏感性,借助有限元分析软件Midas Civil,通过分类处理建立边墩为变高墩和中墩为变高墩两类有限元分析模型。根据Newmark-β法对多自由度体系的曲线桥梁结构进行动力时程分析,结合曲线桥梁结构地震激励的输入基本方式,计算两类墩高布置形式下两跨曲线连续梁桥结构的基本周期、墩顶位移、主梁内力和桥墩墩底内力的变化规律,通过对计算结果分析探究桥墩高度参数和桥墩高度比参数对曲线桥梁结构地震响应的影响规律。研究结果表明:相同条件下,Ⅱ类曲线桥梁的整体刚度小于Ⅰ类曲线桥梁结构;各墩顶径向位移对桥墩高度比和墩高参数敏感性不同;中墩顶曲线主梁内力耦合机理复杂,难以用较少结构参数表征;变高墩墩底内力与曲线桥梁桥墩布置类型密切相关。研究结果可用于指导山区曲线桥梁结构的抗震分析和设计。
|
| 关 键 词： | 曲线桥梁 时程分析 墩高参数 墩高布置 动力敏感性 |
| 收稿时间： | 2018/9/26 0:00:00 |
Dynamic Sensitivity Analysis of Pier-heightParameters of Curved Bridges |
| |
| CHENG Maili.Dynamic Sensitivity Analysis of Pier-heightParameters of Curved Bridges[J].Northwestern Seismological Journal,2020,42(1):15-21. |
| |
| Authors: | CHENG Maili |
| |
| Institution: | School of Architecture and Civil Engineering, Yan''an University, Yan''an 716000, Shaanxi, China |
| |
| Abstract: | To study the sensitivity of the pier-height parameters of curved bridges to the seismic response,we used Midas Civil finite-element-analysis software to establish two finite-element-analysis models for high and middle-range piers.We then used the Newmark-βmethod to perform a dynamic time history analysis of a curved bridge structure with a multi-degrees-of-freedom system.Combined with the basic input of the seismic excitation of a curved bridge structure,we calculated the changes in the basic period,displacement at the top of the pier,and the internal forces of the main beam and pier bottom of a two-span continuous bridge under two different pier-height arrangements.Based on our calculation results,we discuss the influences of the pier height and pier-height ratio on the seismic response of the curved bridge structure.The results show that under the same conditions,the overall stiffness of bridge II is less than that of bridge I,and the sensitivities of the radial displacements at the top of each pier to the pier height and pier-height ratio differ.We found the internal force of a high pier to be closely related to the type of bridge pier arrangement.These results can be used to guide the seismic analysis and design of curved bridge structures in mountainous areas. |
| |
| Keywords: | curved bridge time history analysis pier height parameter pier height arrangement dynamic sensitivity |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《西北地震学报》浏览原始摘要信息 |
| 点击此处可从《西北地震学报》下载免费的PDF全文 |
|
