多種滯回模型下單自由度體系的彈塑性反應(yīng)譜分析
發(fā)布時(shí)間：2018-11-22 10:26
【摘要】：基于位移延性的地震力調(diào)整系數(shù)是地震力理論中很重要的一個(gè)分支,但是早期的研究計(jì)算所基于的地震波記錄較少,沒有考慮地震波本身的頻譜特性和特征周期對(duì)地震力調(diào)整系數(shù)的影響,存在著結(jié)果失真的情況。同時(shí)對(duì)單自由度體系進(jìn)行彈塑性時(shí)程分析,獲得等延性彈塑性動(dòng)力放大系數(shù)譜的成果也較少。 論文首先基于自編的C++程序,對(duì)雙線性(BIL)滯回模型和剪切滑移(SSP)滯回模型的單自由度體系在地震作用下進(jìn)行彈塑性動(dòng)力分析,得到了不考慮和考慮P-△效應(yīng)時(shí)不同場地、延性等參數(shù)組合下的雙周期標(biāo)準(zhǔn)化的地震力調(diào)整系數(shù)R譜,并與理想彈塑性(EPP)滯回模型的R譜比較。結(jié)果表明：在TgaTTgR周期段,等能量準(zhǔn)則在BIL模型中成立,EPP模型的R值大于等能量準(zhǔn)則的值,顯示了耗能能力在此周期段有重要影響；在T2TgR周期段,三種滯回模型的R譜接近；P-△效應(yīng)對(duì)BIL模型的影響可以忽略,對(duì)EPP和SSP模型影響則隨延性增大而增大；對(duì)具有90%保證率的R譜,BIL模型在TgaTTgR范圍內(nèi)很小,SSP模型僅略有改善,EPP模型最好。上述結(jié)論的實(shí)用意義是：(i)對(duì)滑移型滯回體系,如果結(jié)構(gòu)的周期處在TgaTTgR范圍內(nèi),應(yīng)要求框架部分的承載力不能小于某一百分比。(ii)有必要在采用高延性設(shè)計(jì)思路的結(jié)構(gòu)體系的抗震設(shè)計(jì)中,在計(jì)算基底剪力時(shí)考慮P-△效應(yīng)的影響。 接著,得到了考慮承載力退化時(shí)不同場地、延性系數(shù)等參數(shù)組合下的雙周期標(biāo)準(zhǔn)化的地震力調(diào)整系數(shù)R譜,計(jì)算了承載力有退化的修正EPP模型的基底剪力影響系數(shù)譜αEK,提出了αEK譜的簡化計(jì)算公式,用以分析承載力退化對(duì)基底剪力的影響,進(jìn)而得到與退化模型等效的理想彈塑性模型。結(jié)果表明：承載力退化對(duì)BIL和SSP模型的影響不大,對(duì)修正EPP模型的影響則隨退化值增大而增大。實(shí)踐中對(duì)退化的修正EPP模型,應(yīng)采用與延性系數(shù)定義相配套的地震力折減系數(shù)。對(duì)于和理想彈塑性模型延性等效的承載力有退化的結(jié)構(gòu)體系,其承載力是理想彈塑性模型的αEK倍,同時(shí)變形能力需求也為理想彈塑性模型的αEK倍。 與此同時(shí),按照與地震力調(diào)整系數(shù)譜相同的參數(shù)組合,建立彈塑性動(dòng)力放大系數(shù)β譜。結(jié)果顯示直接建立彈塑性動(dòng)力放大系數(shù)譜來計(jì)算彈塑性地震力,要比采用地震力調(diào)整系數(shù)來進(jìn)行折減要更加理想；阻尼比是彈性動(dòng)力放大的重要因素,而承載力退化和P-△效應(yīng)則對(duì)彈塑性動(dòng)力放大系數(shù)均存在較大影響。 為了探討曲率延性在實(shí)際工程中的應(yīng)用,進(jìn)而探索截面分類的依據(jù),本文又通過理論方法來研究鋼結(jié)構(gòu)體系在彈塑性階段的抗震性能,利用ANSYS有限元軟件對(duì)一系列懸臂梁和三桿框架進(jìn)行了推覆分析,以考察其曲率延性和位移延性關(guān)系。結(jié)果顯示位移延性的穩(wěn)定性較好,曲率延性會(huì)突然增大,不適合于設(shè)計(jì)運(yùn)用；在相同的地震力作用下,曲率延性要大于位移延性,隨著模型的不同而不同；在相同的位移延性下,懸臂梁的曲率延性最小,梁上無均布荷載的三桿框架次之,梁上有均布荷載的最大。 最后對(duì)理想彈塑性(EPP)滯回模型和修正的克拉夫(MC)滯回模型組成的雙重抗側(cè)力的SDOF體系在地震作用下進(jìn)行彈塑性動(dòng)力分析,得到了不同參數(shù)參數(shù)組合下的雙特征周期標(biāo)準(zhǔn)化的地震力調(diào)整系數(shù)R譜和動(dòng)力放大系數(shù)譜,并與EPP、MC滯回模型的R譜比較。結(jié)果表明：雙重抗側(cè)力體系的R譜譜值均比相同地震力作用下的EPP、MC大,譜值特性更接近MC模型。承載力退化對(duì)R譜的影響不能忽略,隨著退化值的增大而減小。
[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
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU352.11
本文編號(hào)：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
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU352.11
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