【摘要】：反應(yīng)譜設(shè)計(jì)是結(jié)構(gòu)抗震設(shè)計(jì)中的一種重要方法,反應(yīng)譜法具有計(jì)算簡單,且標(biāo)準(zhǔn)設(shè)計(jì)譜生成只需計(jì)算一次,適用性強(qiáng)的優(yōu)點(diǎn)的。然目前國內(nèi)的抗震設(shè)計(jì)規(guī)范中普遍采用彈性反應(yīng)譜理論,通過地震力調(diào)整系數(shù)進(jìn)行折減,從而計(jì)算結(jié)構(gòu)彈塑性響應(yīng)。此過程中并未考慮地震波自身的頻譜特性及特征周期對地震力調(diào)整系數(shù)的影響,使結(jié)果增大了誤差的可能性。本文通過反應(yīng)譜計(jì)算軟件Bispec,對理想彈塑性模型、硬化指數(shù)?=0.10的雙折線滯回模型及Clough剛度退化模型三種模型的單自由度體系進(jìn)行了在地震作用下動力彈塑性分析,同時(shí)考慮延性、阻尼、后期剛度、二階效應(yīng)及場地等因素的影響。通過特征周期gT對橫坐標(biāo)的標(biāo)準(zhǔn)化,即橫坐標(biāo)為/=0~10gT T,延性變化范圍2~8,統(tǒng)計(jì)得到在A、B兩類場地條件下的R?譜,并從中發(fā)掘延性、阻尼、后期剛度、二階效應(yīng)對R?譜譜值的影響規(guī)律。主要研究成果有:(1)統(tǒng)計(jì)后三種模型在A、B兩類場地條件下的Rμ譜在特征周期Tg附近存在相當(dāng)明顯的峰值特征,場地條件的不同,其Rμ譜存在一定的差異,但總體趨勢相近,T/Tg=2可作一分界點(diǎn),此后譜曲線基本趨于一直線,隨延性的增大,Rμ譜譜值有所增加,各延性下的譜曲線特征基本一致。(2)Rμ譜值隨阻尼比的增大而減小,對峰值的影響尤為顯著。當(dāng)阻尼比達(dá)到0.15時(shí),Rμ譜峰值逐漸消散,在不同延性條件下,阻尼對Rμ譜的影響趨勢大體一致;在同一延性條件下,隨阻尼比的增大,Rμ譜譜值減小,且譜曲線隨阻尼的增大而受其影響的程度逐漸降低,說明阻尼的影響存在一定的范圍。(3)在同一延性條件下,隨后期剛度的增大,等延性強(qiáng)度需求譜譜值逐漸增大,最終后期剛度對譜曲線的影響逐漸趨于一穩(wěn)定水平。(4)在同延性條件下,隨二階效應(yīng)系數(shù)?的增大,Rμ譜譜值逐漸降低,且其降低趨勢亦在增大,較大的P??效應(yīng)不利于結(jié)構(gòu)的穩(wěn)定;在??0.08時(shí),延性對不同?下的Rμ譜的影響程度不是很大,??0.08時(shí),其區(qū)別顯現(xiàn)出來,隨延性的增大,影響程度遞增,在確定的?值下,其對譜曲線的影響隨周期的增大最終處于一常水平。(5)對單柱結(jié)構(gòu)彈塑性響應(yīng),通過Vindic模型、本文模型及時(shí)程分析,采用Chopra的改進(jìn)能力譜法得到了比較準(zhǔn)確的計(jì)算結(jié)果,體現(xiàn)出Chopra的改進(jìn)能力譜法對于計(jì)算橋梁結(jié)構(gòu)彈塑性反應(yīng)是一種可行的方法,同時(shí)也說明本文直線段模型亦是可行的。
[Abstract]:Response spectrum design is an important method in seismic design of structures. The response spectrum method has the advantages of simple calculation and only need to be calculated once to generate standard design spectrum. However, at present, the elastic response spectrum theory is widely used in the domestic seismic design code, and the seismic force adjustment coefficient is reduced to calculate the elastoplastic response of the structure. In this process, the influence of the frequency spectrum characteristics of the seismic wave and the characteristic period on the seismic force adjustment coefficient is not considered, which increases the possibility of the error. In this paper, the single degree of freedom (DOF) system of ideal elastoplastic model, double fold hysteretic model with hardening exponent = 0.10 and Clough stiffness degradation model is analyzed by response spectrum calculation software Bispec,. At the same time, the effects of ductility, damping, late stiffness, second order effect and site are considered. In this paper, the characteristic periodic gT is used to standardize the horizontal coordinates, that is, the transverse coordinate is / = 0~10gT T, and the ductility range is 2 ~ 8. Spectrum, and explore the ductility, damping, late stiffness, second-order effects on R? The influence law of spectral value. The main research results are as follows: (1) the R 渭 spectrum of the last three models has obvious peak value near the characteristic period Tg under the condition of two kinds of sites, and the R 渭 spectrum of the three models is different with the difference of the site conditions. But the general trend is similar, T/Tg=2 can be used as a dividing point, after that, the spectral curve tends to be a straight line, and with the increase of ductility, the value of R 渭 spectrum increases. (2) the value of R 渭 decreases with the increase of damping ratio, especially the effect of peak value. When the damping ratio reaches 0.15, the peak value of R 渭 spectrum dissipates gradually, and the effect of damping on R 渭 spectrum is almost the same under different ductility conditions. Under the same ductility condition, with the increase of damping ratio, the spectral value of R 渭 decreases, and the spectral curve decreases gradually with the increase of damping, which indicates that the influence of damping exists in a certain range. (3) under the same ductility condition, With the increase of stiffness in the following period, the required spectral value of isoductive strength gradually increases, and the effect of stiffness on the spectral curve gradually tends to a stable level in the later stage. (4) under the same ductility condition, with the second order effect coefficient? The value of R 渭 spectrum decreases gradually, and the decreasing trend is also increasing. The effect is not conducive to the stability of the structure, and at 0.08, the ductility is different. The influence of the R 渭 spectrum is not very great, when? 0.08, the difference appears, with the increase of ductility, the degree of influence increases. (5) for the elastoplastic response of a single column structure, the time-history analysis of this model is based on the Vindic model. The improved capability spectrum method of Chopra is used to obtain more accurate calculation results, which shows that the improved capability spectrum method of Chopra is a feasible method for calculating the elastoplastic response of bridge structures, and it also shows that the linear segment model in this paper is feasible.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.55

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本文編號：2372089