高墩大跨连续刚构桥线性与非线性稳定研究

发布时间：2018-01-14 10:39

本文关键词：高墩大跨连续刚构桥线性与非线性稳定研究　出处：《铁道工程学报》2015年06期 　论文类型：期刊论文

【摘要】：研究目的:高墩大跨度连续刚构桥悬浇施工中,保证最大悬臂状态下结构的稳定性至关重要。本文以山西省某高墩大跨连续刚构桥(90+168+90)m为工程背景,以其2号墩T构最大悬臂状态为分析对象,考虑挂篮正常工作及单侧挂篮跌落两类情况,对高墩线性和非线性稳定进行系统性研究。通过引入"稳定安全储备系数"的概念,对两类稳定问题及是否考虑箍筋约束作用对墩柱非线性稳定性能的影响问题进行对比分析。研究结论:(1)在主梁所承受的恒载中,对刚构桥线性稳定性起控制作用的是结构自重;(2)风荷载不影响结构线性稳定,但对结构非线性稳定有明显影响;(3)对于高墩的稳定性,仍可采用线性稳定的分析方法和评判标准;(4)当考虑墩柱截面箍筋的约束作用时仍可采用稳定系数大于4~5的限值标准,当不考虑墩柱截面箍筋的约束作用时可适当提高稳定系数限值;(5)该研究结果可为高墩大跨连续刚构桥的设计和施工提供参考。
[Abstract]:Research purpose: high pier and large span continuous rigid frame bridge suspension casting construction. It is very important to ensure the stability of the structure under the state of maximum cantilever. This paper takes 90 168 90m of a continuous rigid frame bridge with high piers and long span as the engineering background. Taking the maximum cantilever state of the T structure of Pier 2 as the analysis object, the normal operation of the hanging basket and the drop of the hanging basket on one side are considered. The linear and nonlinear stability of high pier is studied systematically. The concept of "stable safety reserve coefficient" is introduced. Two kinds of stability problems and whether to consider the effect of stirrups constraint on nonlinear stability of pier column are compared and analyzed. Conclusion: 1) in the dead load of the main beam. It is the weight of the structure that controls the linear stability of the rigid frame bridge. (2) Wind load does not affect the linear stability of the structure, but has obvious effect on the nonlinear stability of the structure; 3) for the stability of high piers, linear stability analysis method and evaluation criteria can be adopted. 4) when the constraint of stirrups in section of pier column is considered, the limit value of stability coefficient greater than 4 ~ 5 can still be adopted, and the limit value of stability coefficient can be increased appropriately when the constraint of stirrups of section of pier column is not considered. The results can provide reference for the design and construction of long span continuous rigid frame bridge with high piers.
【作者单位】：华东交通大学;铁道第三勘察设计院集团有限公司;
【基金】：国家自然科学基金(51468018)
【分类号】：U441;U448.23
【正文快照】： 双肢薄壁大跨连续刚构桥因其在经济上的竞争力 300;300和施工上的方便性[|],在国内得到了广泛的采用。为 Tl.sNI!|'_ts'y了能有效地减小因温度变化、混凝土收缩、徐变以及地 A震力对结构的不利影响,同时为了适应地形条件和桥 m丨fo 70:丑■70 o梁跨度,这类桥梁的桥墩高度不断

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