钢阻尼支座对简支梁桥的减震性能分析

发布时间：2018-07-18 08:45

【摘要】：桥梁结构的抗震设计可以分为延性设计与减隔震设计。减隔震设计是使用一定的措施或者增加附加装置使桥梁结构与地震动分离开来,或者是吸收消耗地震动传给结构的能量,即隔震与减震消能技术,以保证结构的安全。本文基于"支座功能分离"的设计思路,介绍一种新型钢阻尼支座,它由减震榫通过串联的方式与球形钢支座组合成整体。文章采用理论计算与试验相结合的方式对钢阻尼支座的减震性能进行研究。主要研究内容如下:1、对钢阻尼支座的拟静力试验结果进行分析,主要包括其滞回曲线、骨架曲线、初始弹性刚度、刚度退化、承载力退化以及等效粘滞阻尼系数等指标;2、采用有限元程序建立钢阻尼支座模型,计算其滞回曲线、骨架曲线等,并与试验结果进行了对比,试验结果与有限元模拟结果基本吻合;3、建立铁路某简支梁桥模型,研究了钢阻尼支座简支梁桥的桥墩在地震作用下的动力响应,并对其减震效果作出分析评价;4、分析了钢阻尼支座简支梁桥与普通支座简支梁桥采用《铁路工程抗震规范》(GB50111-2006)计算时的区别,给出了钢阻尼支座简支梁桥地震响应的简化计算方法,并将简化计算结果与时程计算结果相比对,误差较小,说明钢阻尼支座简支梁桥的简化计算方法计算地震响应时可以在一定程度上代替复杂而且又耗时的时程计算。5、研究桥墩高度对钢阻尼支座简支梁桥地震响应的影响,利用简化计算方法与时程计算方法分别计算了墩高为5m、8m、10m、15m、20m时,钢阻尼支座简支梁桥的减震率。
[Abstract]:The seismic design of the bridge structure can be divided into ductility design and seismic isolation design. The seismic isolation design is to use certain measures or add additional devices to separate the bridge structure from the ground motion, or to absorb the energy that is transmitted to the structure by the consumption of ground vibration, that is, isolation and damping energy dissipation technology to ensure the safety of the structure. A new type of steel damping support is introduced. It is composed of a spherical steel bearing with a damping tenon in series. The damping property of the steel damping bearing is studied in the combination of theoretical calculation and test. The main contents are as follows: 1, the pseudo static test knot of the steel damping bearing is made as follows. The analysis mainly includes the hysteresis curve, the skeleton curve, the initial elastic stiffness, the stiffness degradation, the bearing capacity degradation and the equivalent viscous damping coefficient. 2, the steel damping support model is established by the finite element program, the hysteresis curve and the skeleton curve are calculated, and the test results are compared with the experimental results. The test results and the finite element simulation are compared. The results are basically consistent. 3, the model of a simple supported beam bridge is established and the dynamic response of the piers of the steel damped support simple supported beam bridge under the earthquake action is studied, and the damping effect is analyzed and evaluated. 4, the analysis of the simple supported beam bridge of the steel damping bearing and the simple supported beam bridge for the calculation of the seismic code for the Railway Engineering (GB50111-2006) is analyzed. The simplified calculation method of seismic response of the simple supported beam bridge with steel damping bearing is given, and the simplified calculation results are compared with the time history calculation results, and the error is smaller. It shows that the simplified calculation method of the simple supported beam bridge of the steel damping bearing can replace the complicated and time-consuming time history calculation.5 for the calculation of the seismic response to a certain extent. The effect of pier height on seismic response of steel damped support simple supported beam bridge is calculated by using simplified calculation method and time history calculation method to calculate the damping ratio of the simple supported beam bridge with the height of 5m, 8m, 10m, 15m and 20m respectively.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U448.217

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