多种滞回模型下单自由度体系的弹塑性反应谱分析
发布时间：2018-11-22 10:26
【摘要】：基于位移延性的地震力调整系数是地震力理论中很重要的一个分支,但是早期的研究计算所基于的地震波记录较少,没有考虑地震波本身的频谱特性和特征周期对地震力调整系数的影响,存在着结果失真的情况。同时对单自由度体系进行弹塑性时程分析,获得等延性弹塑性动力放大系数谱的成果也较少。 论文首先基于自编的C++程序,对双线性(BIL)滞回模型和剪切滑移(SSP)滞回模型的单自由度体系在地震作用下进行弹塑性动力分析,得到了不考虑和考虑P-△效应时不同场地、延性等参数组合下的双周期标准化的地震力调整系数R谱,并与理想弹塑性(EPP)滞回模型的R谱比较。结果表明：在TgaTTgR周期段,等能量准则在BIL模型中成立,EPP模型的R值大于等能量准则的值,显示了耗能能力在此周期段有重要影响；在T2TgR周期段,三种滞回模型的R谱接近；P-△效应对BIL模型的影响可以忽略,对EPP和SSP模型影响则随延性增大而增大；对具有90%保证率的R谱,BIL模型在TgaTTgR范围内很小,SSP模型仅略有改善,EPP模型最好。上述结论的实用意义是：(i)对滑移型滞回体系,如果结构的周期处在TgaTTgR范围内,应要求框架部分的承载力不能小于某一百分比。(ii)有必要在采用高延性设计思路的结构体系的抗震设计中,在计算基底剪力时考虑P-△效应的影响。 接着,得到了考虑承载力退化时不同场地、延性系数等参数组合下的双周期标准化的地震力调整系数R谱,计算了承载力有退化的修正EPP模型的基底剪力影响系数谱αEK,提出了αEK谱的简化计算公式,用以分析承载力退化对基底剪力的影响,进而得到与退化模型等效的理想弹塑性模型。结果表明：承载力退化对BIL和SSP模型的影响不大,对修正EPP模型的影响则随退化值增大而增大。实践中对退化的修正EPP模型,应采用与延性系数定义相配套的地震力折减系数。对于和理想弹塑性模型延性等效的承载力有退化的结构体系,其承载力是理想弹塑性模型的αEK倍,同时变形能力需求也为理想弹塑性模型的αEK倍。 与此同时,按照与地震力调整系数谱相同的参数组合,建立弹塑性动力放大系数β谱。结果显示直接建立弹塑性动力放大系数谱来计算弹塑性地震力,要比采用地震力调整系数来进行折减要更加理想；阻尼比是弹性动力放大的重要因素,而承载力退化和P-△效应则对弹塑性动力放大系数均存在较大影响。 为了探讨曲率延性在实际工程中的应用,进而探索截面分类的依据,本文又通过理论方法来研究钢结构体系在弹塑性阶段的抗震性能,利用ANSYS有限元软件对一系列悬臂梁和三杆框架进行了推覆分析,以考察其曲率延性和位移延性关系。结果显示位移延性的稳定性较好,曲率延性会突然增大,不适合于设计运用；在相同的地震力作用下,曲率延性要大于位移延性,随着模型的不同而不同；在相同的位移延性下,悬臂梁的曲率延性最小,梁上无均布荷载的三杆框架次之,梁上有均布荷载的最大。 最后对理想弹塑性(EPP)滞回模型和修正的克拉夫(MC)滞回模型组成的双重抗侧力的SDOF体系在地震作用下进行弹塑性动力分析,得到了不同参数参数组合下的双特征周期标准化的地震力调整系数R谱和动力放大系数谱,并与EPP、MC滞回模型的R谱比较。结果表明：双重抗侧力体系的R谱谱值均比相同地震力作用下的EPP、MC大,谱值特性更接近MC模型。承载力退化对R谱的影响不能忽略,随着退化值的增大而减小。
[Abstract]:The seismic force adjustment coefficient based on the displacement ductility is an important branch in the theory of seismic force, but the early research and calculation are based on the low record of the seismic wave, and the influence of the spectral characteristics of the seismic wave and the characteristic period on the adjustment coefficient of the seismic force is not taken into account. there is a situation in which the result is distorted. At the same time, the elastic-plastic time-range analysis of a single-degree-of-freedom system is carried out, and the results of the equal-ductility elastic-plastic power amplification factor spectrum are also less. In this paper, the elastic-plastic dynamic analysis of a single-degree-of-freedom system of a bilinear (BIL) hysteresis model and a shear slip (SSP) hysteresis model based on a self-designed C ++ program is carried out under the action of an earthquake. The R-spectrum of the two-cycle normalized seismic force adjustment coefficient R-spectrum and the R-spectrum of the ideal elastic-plastic (EPP) hysteresis model under the combination of site and ductility The results show that, in the TgaTgR period, the isoenergy criterion is set up in the BIL model, and the R value of the EPP model is greater than that of the isoenergy criterion. It shows that the energy dissipation capacity has an important influence on this period. In the T2TgR period, the R spectrum of the three hysteretic models The effect of P-P effect on the BIL model can be neglected, and the effect on the EPP and SSP model is increased with the increase of the ductility; for the R spectrum with 90% assurance rate, the BIL model is very small in the TgaTgR range, and the SSP model is only slightly improved, and the EPP model The practical significance of the above-mentioned conclusion is: (i) the slip-type hysteresis system; if the period of the structure is within the TgaTgR range, the bearing capacity of the frame part shall not be less than one hundred Sub-ratio. (ii) It is necessary to consider the P-equivalent effect in the calculation of the shear of the base in the seismic design of the structural system with high ductility design The influence of the two-cycle normalized seismic force adjustment factor R on the combination of different sites and ductility factors in consideration of the degradation of the bearing capacity is obtained. The modified EPP model based on the modified EPP model with the degradation of the bearing capacity is calculated. The calculation formula is used to analyze the influence of the bearing capacity degradation on the base shear force and to obtain the ideal equivalent to the degradation model. The results show that the influence of the degradation of the bearing capacity on the model of BIL and SSP is not large, and the effect on the modified EPP model is with the degradation value. Increase and increase. In practice, the modified EPP model of the degradation shall adopt the earthquake which is matched with the definition of the ductility factor. The force-reduction factor is a structural system that has a degradation in the bearing capacity equivalent to the ductility of the ideal elastic-plastic model. The bearing capacity of the structural system is the same as that of the ideal elastic-plastic model. At the same time, the deformation capability requirement is an ideal elastic-plastic model. At the same time, the elastic-plastic is established according to the same parameter combination as the seismic force adjustment coefficient spectrum. The results show that the elastic-plastic dynamic magnification factor is directly established to calculate the elastic-plastic seismic force, which is more ideal than the seismic force adjustment coefficient, and the damping ratio is elastic. The important factors of force amplification, and the degradation of the bearing capacity and the P-load effect on the elastic-plastic power amplification system In order to study the application of the curvature ductility in the practical engineering, and then to explore the basis of the section classification, the seismic performance of the steel structure system in the elastic-plastic phase is studied by the theory method, and a series of cantilever beams and a series of cantilever beams are used by the finite element software of ANSYS. The three-bar framework is subjected to a push-over analysis to investigate The results show that the stability of the displacement ductility is good, the ductility of the curvature can be increased suddenly, and it is not suitable for the design and application; under the same seismic force, the ductility of the curvature is greater than the displacement ductility, and as the model is different, under the same displacement ductility, The curvature ductility of the cantilever beam is the least, and the three-rod frame with no uniform load on the beam is the second. The maximum of the load on the beam is the maximum. Finally, the SDOF system with the dual anti-lateral force of the ideal elastic-plastic (EPP) hysteresis model and the modified Kraff (MC) hysteresis model is The elastic-plastic dynamic analysis is carried out under the action of earthquake, and the seismic force adjustment coefficient R spectrum and the power amplification factor spectrum of the two characteristic period standardization under the combination of different parameter parameters are obtained, and the seismic force adjustment coefficient R spectrum and the power amplification factor spectrum are obtained. The results show that the R-spectrum of the dual-side-force system is lower than that of EPP and M under the same seismic force. C is large and the characteristic of the spectral value is closer to the MC model. The effect of the degradation of the bearing capacity on the R spectrum cannot
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.11
本文编号：2349032
[Abstract]:The seismic force adjustment coefficient based on the displacement ductility is an important branch in the theory of seismic force, but the early research and calculation are based on the low record of the seismic wave, and the influence of the spectral characteristics of the seismic wave and the characteristic period on the adjustment coefficient of the seismic force is not taken into account. there is a situation in which the result is distorted. At the same time, the elastic-plastic time-range analysis of a single-degree-of-freedom system is carried out, and the results of the equal-ductility elastic-plastic power amplification factor spectrum are also less. In this paper, the elastic-plastic dynamic analysis of a single-degree-of-freedom system of a bilinear (BIL) hysteresis model and a shear slip (SSP) hysteresis model based on a self-designed C ++ program is carried out under the action of an earthquake. The R-spectrum of the two-cycle normalized seismic force adjustment coefficient R-spectrum and the R-spectrum of the ideal elastic-plastic (EPP) hysteresis model under the combination of site and ductility The results show that, in the TgaTgR period, the isoenergy criterion is set up in the BIL model, and the R value of the EPP model is greater than that of the isoenergy criterion. It shows that the energy dissipation capacity has an important influence on this period. In the T2TgR period, the R spectrum of the three hysteretic models The effect of P-P effect on the BIL model can be neglected, and the effect on the EPP and SSP model is increased with the increase of the ductility; for the R spectrum with 90% assurance rate, the BIL model is very small in the TgaTgR range, and the SSP model is only slightly improved, and the EPP model The practical significance of the above-mentioned conclusion is: (i) the slip-type hysteresis system; if the period of the structure is within the TgaTgR range, the bearing capacity of the frame part shall not be less than one hundred Sub-ratio. (ii) It is necessary to consider the P-equivalent effect in the calculation of the shear of the base in the seismic design of the structural system with high ductility design The influence of the two-cycle normalized seismic force adjustment factor R on the combination of different sites and ductility factors in consideration of the degradation of the bearing capacity is obtained. The modified EPP model based on the modified EPP model with the degradation of the bearing capacity is calculated. The calculation formula is used to analyze the influence of the bearing capacity degradation on the base shear force and to obtain the ideal equivalent to the degradation model. The results show that the influence of the degradation of the bearing capacity on the model of BIL and SSP is not large, and the effect on the modified EPP model is with the degradation value. Increase and increase. In practice, the modified EPP model of the degradation shall adopt the earthquake which is matched with the definition of the ductility factor. The force-reduction factor is a structural system that has a degradation in the bearing capacity equivalent to the ductility of the ideal elastic-plastic model. The bearing capacity of the structural system is the same as that of the ideal elastic-plastic model. At the same time, the deformation capability requirement is an ideal elastic-plastic model. At the same time, the elastic-plastic is established according to the same parameter combination as the seismic force adjustment coefficient spectrum. The results show that the elastic-plastic dynamic magnification factor is directly established to calculate the elastic-plastic seismic force, which is more ideal than the seismic force adjustment coefficient, and the damping ratio is elastic. The important factors of force amplification, and the degradation of the bearing capacity and the P-load effect on the elastic-plastic power amplification system In order to study the application of the curvature ductility in the practical engineering, and then to explore the basis of the section classification, the seismic performance of the steel structure system in the elastic-plastic phase is studied by the theory method, and a series of cantilever beams and a series of cantilever beams are used by the finite element software of ANSYS. The three-bar framework is subjected to a push-over analysis to investigate The results show that the stability of the displacement ductility is good, the ductility of the curvature can be increased suddenly, and it is not suitable for the design and application; under the same seismic force, the ductility of the curvature is greater than the displacement ductility, and as the model is different, under the same displacement ductility, The curvature ductility of the cantilever beam is the least, and the three-rod frame with no uniform load on the beam is the second. The maximum of the load on the beam is the maximum. Finally, the SDOF system with the dual anti-lateral force of the ideal elastic-plastic (EPP) hysteresis model and the modified Kraff (MC) hysteresis model is The elastic-plastic dynamic analysis is carried out under the action of earthquake, and the seismic force adjustment coefficient R spectrum and the power amplification factor spectrum of the two characteristic period standardization under the combination of different parameter parameters are obtained, and the seismic force adjustment coefficient R spectrum and the power amplification factor spectrum are obtained. The results show that the R-spectrum of the dual-side-force system is lower than that of EPP and M under the same seismic force. C is large and the characteristic of the spectral value is closer to the MC model. The effect of the degradation of the bearing capacity on the R spectrum cannot
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.11
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