深水桥梁动水效应规范计算方法的近断层地震动检验
发布时间：2019-05-19 18:33
【摘要】：动水效应是深水桥梁抗震设计中需要考虑的重要问题。由于高墩、大跨的结构特点,深水桥梁通常具有较长的自振周期,当其邻近或跨越断层时,长周期脉冲型地震动作用势必对此类结构带来更加严峻的考验。目前,脉冲型近场地震下深水桥梁的抗震研究相当薄弱,相关规范计算方法在此类地震下的有效性及适用范围亟待检验。 本文在系统总结国内外代表性规范的动水效应计算方法并分析其不足的基础上,分别以等效单墩模型和深水连续梁桥为对象,以典型的脉冲型近场地震动为输入,从自振特性、分布动水压力、动水压力合力及其作用位置、动水压力作用下的结构地震响应等指标的角度,对国内外代表性规范的动水效应计算方法进行了有效性检验；并以长细比为主要参数构造算例模型组,对各规范动水效应计算方法的合理适用范围进行了量化讨论。本文的主要研究工作如下： 1.系统梳理了国内外代表性规范的动水效应计算方法,对比并总结了各规范在动水压力计算方面存在的主要问题或不足。 2.建立深水桥梁的等效圆截面单墩模型,以考虑流固耦合效应的墩—水全数值计算结果为基准,从自振特性、分布动水压力、动水压力合力及其作用位置、动水压力作用下的结构地震响应等指标的角度,对各规范算法在脉冲型近场地震动作用下的有效性进行了量化检验,对不同规范在各类指标上的误差率进行了具体评价。 3.以某深水连续梁桥为对象,分别建立考虑流固耦合效应的桥梁—水体全数值计算模型及半解析—半数值分析模型,对各规范算法在脉冲型近场地震动作用下全桥结构计算的有效性进行了量化检验,对不同规范在各类指标上的误差率进行了具体评价,并和单墩模型的评估结果进行了对比。针对我国铁路规范在分布动水压力计算方面存在的不足,对其可能的改进方向进行了讨论。 4.以长细比为主要参数,构造两类算例模型组,分别从结构自振特性、动水压力量值、结构地震响应的角度提炼了各项指标误差率的分布特征,量化界定了各规范的适用范围。
[Abstract]:Dynamic water effect is an important problem to be considered in seismic design of deep-water bridges. Because of the structural characteristics of high piers and long span, deep-water bridges usually have a long natural vibration period. When they are adjacent to or across faults, the use of long-period pulse seismic action is bound to bring more severe tests to this kind of structure. At present, the seismic research of deep-water bridges under pulse near-field earthquakes is very weak, and the effectiveness and scope of application of the relevant code calculation methods under this kind of earthquakes need to be tested urgently. On the basis of systematically summing up the calculation methods of dynamic water effect of representative codes at home and abroad and analyzing their shortcomings, this paper takes the equivalent single pier model and deep water continuous beam bridge as the object, takes the typical pulse near site vibration as the input, and takes the natural vibration characteristics. From the point of view of distributing dynamic water pressure, dynamic water pressure resultant force and its action position, structural seismic response under dynamic water pressure, the validity of the calculation method of dynamic water effect in representative codes at home and abroad is tested. The model group of numerical examples is constructed with slenderness ratio as the main parameter, and the reasonable applicable range of dynamic water effect calculation methods of each specification is quantitatively discussed. The main research work of this paper is as follows: 1. The calculation methods of dynamic water effect of representative codes at home and abroad are systematically combed, and the main problems or shortcomings of each code in the calculation of dynamic water pressure are compared and summarized. 2. The equivalent circular section single pier model of deep water bridge is established, based on the numerical results of pier and water considering fluid-solid coupling effect, from the natural vibration characteristics, the distribution of dynamic water pressure, the resultant force of dynamic water pressure and its acting position. From the point of view of seismic response of structures under dynamic water pressure, the effectiveness of each specification algorithm under pulse near-site vibration is quantitatively tested, and the error rates of different specifications on various indexes are evaluated concretely. 3. Taking a deep-water continuous beam bridge as the object, the full numerical calculation model and the semi-analytical-semi-numerical analysis model of the bridge-water body considering the fluid-solid coupling effect are established respectively. The validity of the calculation of the whole bridge structure under the action of pulse near-site vibration is quantitatively tested, and the error rates of different specifications on various indexes are evaluated concretely, and the evaluation results are compared with those of the single pier model. In view of the shortcomings of the railway code in the calculation of distributed dynamic water pressure, the possible improvement direction of the railway code is discussed in this paper. 4. Taking slenderness ratio as the main parameter, two kinds of example model groups are constructed. The distribution characteristics of error rate of each index are extracted from the point of view of structural natural vibration characteristics, dynamic water pressure value and structural seismic response, and the applicable scope of each code is quantitatively defined.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55
本文编号：2480967
[Abstract]:Dynamic water effect is an important problem to be considered in seismic design of deep-water bridges. Because of the structural characteristics of high piers and long span, deep-water bridges usually have a long natural vibration period. When they are adjacent to or across faults, the use of long-period pulse seismic action is bound to bring more severe tests to this kind of structure. At present, the seismic research of deep-water bridges under pulse near-field earthquakes is very weak, and the effectiveness and scope of application of the relevant code calculation methods under this kind of earthquakes need to be tested urgently. On the basis of systematically summing up the calculation methods of dynamic water effect of representative codes at home and abroad and analyzing their shortcomings, this paper takes the equivalent single pier model and deep water continuous beam bridge as the object, takes the typical pulse near site vibration as the input, and takes the natural vibration characteristics. From the point of view of distributing dynamic water pressure, dynamic water pressure resultant force and its action position, structural seismic response under dynamic water pressure, the validity of the calculation method of dynamic water effect in representative codes at home and abroad is tested. The model group of numerical examples is constructed with slenderness ratio as the main parameter, and the reasonable applicable range of dynamic water effect calculation methods of each specification is quantitatively discussed. The main research work of this paper is as follows: 1. The calculation methods of dynamic water effect of representative codes at home and abroad are systematically combed, and the main problems or shortcomings of each code in the calculation of dynamic water pressure are compared and summarized. 2. The equivalent circular section single pier model of deep water bridge is established, based on the numerical results of pier and water considering fluid-solid coupling effect, from the natural vibration characteristics, the distribution of dynamic water pressure, the resultant force of dynamic water pressure and its acting position. From the point of view of seismic response of structures under dynamic water pressure, the effectiveness of each specification algorithm under pulse near-site vibration is quantitatively tested, and the error rates of different specifications on various indexes are evaluated concretely. 3. Taking a deep-water continuous beam bridge as the object, the full numerical calculation model and the semi-analytical-semi-numerical analysis model of the bridge-water body considering the fluid-solid coupling effect are established respectively. The validity of the calculation of the whole bridge structure under the action of pulse near-site vibration is quantitatively tested, and the error rates of different specifications on various indexes are evaluated concretely, and the evaluation results are compared with those of the single pier model. In view of the shortcomings of the railway code in the calculation of distributed dynamic water pressure, the possible improvement direction of the railway code is discussed in this paper. 4. Taking slenderness ratio as the main parameter, two kinds of example model groups are constructed. The distribution characteristics of error rate of each index are extracted from the point of view of structural natural vibration characteristics, dynamic water pressure value and structural seismic response, and the applicable scope of each code is quantitatively defined.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55
【参考文献】
相关期刊论文 前1条
1 孙利民,范立础;阪神地震后日本桥梁抗震设计规范的改订[J];同济大学学报(自然科学版);2001年01期
，本文编号：2480967
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