独柱式城市高架桥抗震分析与设计方法研究

发布时间：2018-05-11 08:52

本文选题：独柱墩 + 城市高架桥　；参考：《浙江大学》2015年博士论文

【摘要】：对独柱式城市高架桥进行高效准确的抗震分析及抗震设计,是目前国内外工程抗震领域亟待解决的问题之一。本文结合浙江省交通运输厅科技计划项目“独柱桥墩合理构造型式及实用设计方法的研究(2010H32)”以及浙江省建设厅科研推广项目“基于性能的独柱式城市高架桥桥墩抗震理论分析及试验研究(20142129)”,以独柱式城市高架桥为背景,对独柱墩构件及桥梁系统的抗震分析、设计以及评估方法进行了相关的数值计算和理论分析。主要研究内容及成果如下：(1)对不同施工工艺的独柱墩进行了基于塑性铰模型的抗震性能分析；针对不同的抗震性态评价指标,得出每一个评价指标所对应的最适合的塑性铰模型,为桥梁抗震工作者提供理论指导。(2)提出了改进的基于统计线性化的非线性随机振动虚拟激励法,通过算例进行验证,发现此方法突破了随机振动计算效率低的瓶颈,并且比常规的反应谱法更精确,比动力时程法更高效；以独柱式城市高架桥为研究算例,对其进行相关参数的影响分析,结果表明采用本文所提算法进行计算时,随着独柱墩墩高、桥梁跨度与跨数、视波速以及相干效应的变化,对应的墩顶、墩底的内力及位移会有不同规律的变化,此结论可为独柱式城市高架桥的抗震分析提供准确的理论依据。(3)基于性能的抗震设计理念,确定了城市高架桥的抗震设防水准、性能水准以及对应的性能目标；结合模糊逻辑控制法、神经网络法、自适应遗传算法的优点,提出了一种可以考虑非线性的基于性能的独柱桥墩的抗震设计方法；选取不同截面型式的独柱墩进行验算,发现由此算法所确定的最优设计方案不仅可以满足抗震等级要求及结构性能要求,还可以最大限度地减少工程造价；对设计结果进行Pushover分析,发现其能力曲线与试验滞回环的包络曲线骨架基本一致,说明所提算法的实用性及精确性；将此算法应用于独柱式城市高架桥独柱墩的抗震设计中,可方便、准确、高效的确定其最优设计方案。(4)以可靠度理论为基础,结合能量抗震分析方法,提出了基于滞回能的独柱式城市高架桥抗震设计方法；通过算例研究可以发现：采用此方法确定的独柱式城市高架桥的动力可靠度与地震动平稳持时和地震动谱强度因子有关,随着平稳持时和谱强度因子的增加,桥梁结构的动力可靠度会逐渐减小。(5)以基于性能和的可靠度的抗震设计理论为基础,对不同抗震设防水准下的独柱式城市高架桥进行抗震性能理论分析；采用非线性随机有限元法和概率Pushover法对研究算例进行桥墩及桥梁整体的可靠性研究；结果发现：桥梁整体的失效概率大于单个构件的失效概率；桥梁整体失效概率随着PGA和震级的增加而增加；桥梁在横向更易损坏,因此具有较大的地震风险；非线性随机有限元法与概率Pushover法的计算结果基本一致,但前者的计算值偏小,偏于保守。(6)以全概率理论为基础,基于性能的地震工程框架,引入IDA法,对桥梁结构进行概率地震需求分析,求得易损性曲线,结合地震危险性分析,对通过拉丁超立方体抽样法选取的8个独柱式城市高架桥样本进行数值模拟与计算,最终从概率的角度对研究算例进行抗震性能评估；结果发现：在纵向和横向地震输入下,八个桥梁样本均满足多重抗震设防水准,无论在哪一级的性能水准下均能正常服役,有较高的安全储备,为桥梁工作者提供了一种简单可靠的抗震性能评估方法。
[Abstract]:An efficient and accurate seismic analysis and aseismic design for the single pillar urban viaduct is one of the problems to be solved in the field of earthquake resistance at home and abroad. This paper combines the scientific and technological plan of the Zhejiang provincial transportation department, "the research on the rational structural type and the practical design method of the single column pier (2010H32)" and the scientific research of the Construction Department of Zhejiang Province The anti seismic theory analysis and experimental study of the single column type urban viaduct pier based on performance (20142129). Based on the single column urban viaduct, the seismic analysis, design and evaluation method of the single column pier and bridge system are calculated and analyzed. The main research contents and results are as follows: (1) the aseismic performance analysis based on plastic hinge model for the single column pier with different construction technology is carried out, and the most suitable plastic hinge model for each evaluation index is obtained according to the different evaluation indexes of seismic behavior, which provides the theoretical guidance for the bridge aseismatic workers. (2) an improved nonlinear linear model based on the statistical linearization is proposed. The virtual vibration excitation method is verified by an example. It is found that this method breaks through the bottleneck of the low efficiency of the random vibration calculation and is more accurate than the conventional response spectrum method and is more efficient than the dynamic time history method. The analysis of the influence of the relative parameters on the single column urban viaduct is taken as an example. The results show that the proposed calculation is used in this paper. When the method is calculated, with the height of the single column pier, the span and span of the bridge, the variation of the apparent wave velocity and the coherence effect, the internal force and displacement of the pier top and the bottom of the pier will vary in different laws. This conclusion can provide an accurate theoretical basis for the aseismic analysis of the single pillar city viaduct. (3) the city based on the performance-based seismic design concept has determined the city. The seismic fortification level, performance level and corresponding performance target of the city viaduct, and combining the advantages of fuzzy logic control method, neural network method and adaptive genetic algorithm, a kind of seismic design method which can consider the nonlinear single column pier based on performance is proposed. The optimal design scheme determined by this algorithm can not only meet the requirements of the seismic grade and the structural performance, but also reduce the cost of the project to the maximum. The Pushover analysis of the design results shows that the capability curve is basically the same as the enveloping curve framework of the test hysteresis loop, which shows the practicability and accuracy of the proposed algorithm. This algorithm is applied to the aseismic design of single pillar city viaduct single column pier, which is convenient, accurate and efficient. (4) based on the reliability theory and combined with the energy seismic analysis method, the anti earthquake design method of the single column urban viaduct based on hysteresis energy is put forward. The dynamic reliability of the single column urban viaduct determined by this method is related to the earthquake dynamic stable holding time and the seismic dynamic spectrum intensity factor. With the steady holding time and the spectral intensity factor increasing, the dynamic reliability of the bridge structure will gradually decrease. (5) based on the seismic design theory based on the performance and reliability, the waterproofing of different aseismic design is made. The aseismic performance of the single column urban viaduct is analyzed, and the reliability of the bridge pier and the whole bridge is studied by the nonlinear stochastic finite element method and the probability Pushover method. The results show that the failure probability of the bridge is greater than the failure probability of the single member; the overall failure probability of the bridge is with the PGA and the earthquake. The bridge is more prone to damage in the transverse direction, so it has greater seismic risk; the nonlinear stochastic finite element method is basically the same with the probability Pushover method, but the calculation value of the former is small and conservative. (6) based on the full probability theory, the IDA method is introduced to the bridge structure based on the performance based seismic engineering framework. The probability seismic demand analysis is carried out, the vulnerability curve is obtained, and combined with the seismic hazard analysis, 8 single column urban viaducts selected from the Latin hypercube sampling method are simulated and calculated, and the seismic performance evaluation is carried out from the probability point of view. The results are found in the longitudinal and lateral seismic input. At the same time, the eight Bridge samples all meet the multiple seismic fortification level. No matter which level of the performance level can be served normally and has a high safety reserve, it provides a simple and reliable seismic performance evaluation method for the bridge workers.

【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：U442.55

【相似文献】