速度脈沖強(qiáng)震下偏心RC框架結(jié)構(gòu)抗震設(shè)計(jì)法的基礎(chǔ)研究
發(fā)布時(shí)間：2018-09-01 07:58
【摘要】：結(jié)構(gòu)偏心布置和近斷層速度脈沖地震作用是結(jié)構(gòu)抗震設(shè)計(jì)中兩種極為不利的條件。本文將以往單獨(dú)考慮的這兩種條件綜合,研究偏心鋼筋混凝土(RC)框架結(jié)構(gòu)在速度脈沖地震作用下的抗震需求和設(shè)計(jì)方法。針對目前研究的不足,本文的目的是在開發(fā)考慮軸力-彎矩相互作用恢復(fù)力模型的基礎(chǔ)上,量化研究偏心RC框架結(jié)構(gòu)在速度脈沖強(qiáng)震作用下的抗震需求,提出其延性折減系數(shù)的修正方法,從而建立偏心結(jié)構(gòu)基于強(qiáng)度折減系數(shù)的抗震設(shè)計(jì)方法。本文主要開展了以下幾個(gè)方面的研究工作:(1)開發(fā)軸力-彎矩相互作用模型(N-M模型)�；赩C++平臺和金屬塑性原理,開發(fā)考慮軸力-彎矩相互作用的恢復(fù)力模型。通過對有實(shí)際震害記錄的RC框架結(jié)構(gòu)模型和一超高層建筑結(jié)構(gòu)的分析,評估N-M模型的有效性和計(jì)算效率。結(jié)果表明,N-M模型在結(jié)構(gòu)彈塑性分析中能獲得較為可靠的結(jié)果,且計(jì)算效率較纖維模型或多彈簧模型大為提高。N-M模型能為批量計(jì)算或超大規(guī)模結(jié)構(gòu)分析提供高效途徑和驗(yàn)證手段,可在科研和工程中加以應(yīng)用和完善。(2)研究速度脈沖強(qiáng)震作用下單層偏心結(jié)構(gòu)的抗震需求。揭示不同偏心形式和軸力對結(jié)構(gòu)抗震需求的影響機(jī)理,探討最佳強(qiáng)度中心和剛度中心相對位置。分別研究基于N-M模型的單層偏心RC剪力墻和框架結(jié)構(gòu)在速度脈沖地震作用下的彈性和彈塑性抗震需求變化規(guī)律。結(jié)果表明,單層偏心RC剪力墻和框架結(jié)構(gòu)在速度脈沖強(qiáng)震作用下均比非速度脈沖地震作用下有更大的彈性和彈塑性抗震需求。進(jìn)入彈塑性階段后,速度脈沖效應(yīng)和偏心效應(yīng)兩者存在耦合影響。軸力對彈性抗震需求無影響,但對彈塑性抗震需求有一定影響。三種不同偏心形式中,剛度偏心影響彈性抗震需求,而強(qiáng)度偏心對彈塑性抗震需求的影響最大。建議在結(jié)構(gòu)彈塑性分析中宜增加強(qiáng)度偏心作為平面不規(guī)則結(jié)構(gòu)的判定標(biāo)準(zhǔn)。同一地震工況下控制不同反應(yīng)指標(biāo)的最佳強(qiáng)度中心-剛度中心相對位置有所不同,綜合考慮后的較優(yōu)區(qū)間是強(qiáng)度中心介于質(zhì)心和剛心之間。(3)研究速度脈沖強(qiáng)震作用下多高層偏心RC框架結(jié)構(gòu)的彈塑性抗震需求和地震易損性。探討不同偏心形式對多層框架彈塑性抗震需求的影響程度;以基于N-M模型的一般化多層偏心RC框架模型為對象,研究其彈塑性抗震需求變化規(guī)律。建立偏心結(jié)構(gòu)的地震易損性分析方法,對多高層強(qiáng)度偏心RC框架結(jié)構(gòu)進(jìn)行2.4萬次動力時(shí)程分析,建立其最大層間單元位移、延性和扭轉(zhuǎn)角的地震易損性曲線。結(jié)果表明,一般化多層偏心體系中,底層偏心對彈塑性抗震需求的影響大于其他層偏心,各層均勻偏心工況最為不利。多高層強(qiáng)度偏心框架結(jié)構(gòu)在速度脈沖地震作用下相對于非速度脈沖地震作用下有更大的地震需求超越概率。隨著偏心率的增大,最大層間單元位移角、延性和層間扭轉(zhuǎn)角的超越概率均增大,且偏心率對延性超越概率的影響最為明顯。(4)建立偏心RC框架結(jié)構(gòu)延性折減系數(shù)的修正方法和修正系數(shù)擬合式�；诜磻�(yīng)譜理論,提出對稱結(jié)構(gòu)延性折減系數(shù)Rμ應(yīng)用于偏心結(jié)構(gòu)時(shí)的修正方法,探討偏心率、樓層數(shù)、延性水平和速度脈沖地震效應(yīng)對修正系數(shù)的影響規(guī)律。通過多元非線性回歸分析,建立修正系數(shù)和各影響因素之間的擬合關(guān)系式,并給出應(yīng)用示例。結(jié)果表明,修正系數(shù)的主要影響因素是偏心率、結(jié)構(gòu)延性水平和速度脈沖地震效應(yīng),樓層數(shù)的影響不明顯。建立的修正系數(shù)擬合式能綜合考慮結(jié)構(gòu)偏心和速度脈沖地震效應(yīng)的影響,更為全面和合理地表征Rμ-μ-T關(guān)系。(5)建立偏心RC框架結(jié)構(gòu)基于強(qiáng)度折減系數(shù)的抗震設(shè)計(jì)方法。在評估目前的有害層間位移計(jì)算方法基礎(chǔ)上,提出層間平均剪切變形角和層間平均轉(zhuǎn)角的概念,并進(jìn)行關(guān)系推導(dǎo)和有效性驗(yàn)證。評估強(qiáng)度折減系數(shù)R在當(dāng)今國際主要抗震設(shè)計(jì)規(guī)范中的應(yīng)用情況,建立偏心RC框架結(jié)構(gòu)基于強(qiáng)度折減系數(shù)的抗震設(shè)計(jì)方法并給出設(shè)計(jì)實(shí)例。該方法以R-μ-T關(guān)系為基礎(chǔ),以控制有害位移為參考手段,以評估可接受失效概率為指導(dǎo),在借鑒已有成果基礎(chǔ)上進(jìn)一步考慮了偏心率、豎向不規(guī)則、速度脈沖效應(yīng)對R的綜合影響,使得強(qiáng)度折減系數(shù)的考慮更為全面。
[Abstract]:Eccentric layout and near-fault velocity pulse seismic action are two extremely disadvantageous conditions in structural seismic design. In this paper, the seismic requirements and design methods of eccentric reinforced concrete (RC) frame structures subjected to velocity pulse earthquake are studied by combining the two conditions considered separately in the past. The purpose of this paper is to develop a restoring force model considering axial force-moment interaction, quantitatively study the seismic demand of eccentric RC frame structures under strong earthquake with velocity pulse, and propose a correction method of ductility reduction coefficient, so as to establish the seismic design method of eccentric structures based on strength reduction coefficient. The main research works are as follows: (1) Develop the axial force-moment interaction model (N-M model). Develop the restoring force model considering axial force-moment interaction based on VC++ platform and metal plasticity principle. Evaluate the validity and calculation of N-M model by analyzing RC frame structure model with actual earthquake damage records and a super high-rise building structure. The results show that N-M model can obtain more reliable results in structural elastoplastic analysis, and the calculation efficiency is much higher than that of fiber model or multi-spring model. The aseismic demand of single-story eccentric RC shear wall and frame structure subjected to impulsive earthquake is studied. The mechanism of the influence of different eccentric forms and axial forces on the aseismic demand of the structure is revealed, and the relative positions of the optimum strength center and stiffness center are discussed. The results show that the single-story eccentric RC shear wall and frame structure have greater elastic and elastic-plastic seismic requirements under the action of velocity pulse than under the action of non-velocity pulse. Stiffness eccentricity has the greatest influence on elastic-plastic seismic demand. It is suggested that the strength eccentricity should be added to the elastoplastic analysis as the criterion for judging the plane irregular structure. The relative position of the optimum strength-stiffness center of the response index is different, and the optimum strength center is between the center of mass and the center of rigidity. (3) The elastic-plastic seismic demand and seismic vulnerability of multi-story and high-rise eccentric RC frame structures subjected to strong velocity pulse earthquake are studied. Based on the N-M model, the elastic-plastic seismic demand of multi-storey eccentric RC frame is studied. The seismic vulnerability analysis method of eccentric structure is established. The dynamic time history analysis of multi-storey and high-rise eccentric RC frame structure is carried out 24,000 times, and the maximum inter-storey element displacement and delay are established. The results show that in the general multi-story eccentric system, the influence of the bottom eccentricity on the elastic-plastic seismic demand is greater than that of the other layers, and the uniform eccentricity of each layer is the worst. The multi-story eccentric frame structure under the action of velocity pulse earthquake is larger than that under the action of non-velocity pulse earthquake. With the increase of eccentricity, the exceeding probability of maximum displacement angle, ductility and torsion angle increases, and the influence of eccentricity on the exceeding probability of ductility is most obvious. (4) The correction method and fitting formula of ductility reduction coefficient of eccentric RC frame structure are established. The correction method of symmetrical structure ductility reduction coefficient R_ u applied to eccentric structure is presented. The influence of eccentricity, floor number, ductility level and velocity pulse seismic effect on correction coefficient is discussed. It is shown that the main factors affecting the correction factor are eccentricity, ductility level and velocity pulse seismic effect, and the influence of floor number is not obvious. On the basis of evaluating the present calculation methods of harmful interlayer displacement, the concepts of average interlayer shear deformation angle and average interlayer rotation angle are put forward, and the relationship between them is deduced and validated. The application of strength reduction coefficient R in the main international seismic design codes is evaluated, and eccentric RC is established. The seismic design method of frame structure based on strength reduction coefficient is presented and an example is given. The method is based on R-u-T relation, takes harmful displacement control as a reference method, takes acceptable failure probability as a guide, and takes eccentricity, vertical irregularity and velocity pulse effect into account. The strength reduction factor is considered more comprehensively.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU375.4;TU352.11
本文編號：2216582
[Abstract]:Eccentric layout and near-fault velocity pulse seismic action are two extremely disadvantageous conditions in structural seismic design. In this paper, the seismic requirements and design methods of eccentric reinforced concrete (RC) frame structures subjected to velocity pulse earthquake are studied by combining the two conditions considered separately in the past. The purpose of this paper is to develop a restoring force model considering axial force-moment interaction, quantitatively study the seismic demand of eccentric RC frame structures under strong earthquake with velocity pulse, and propose a correction method of ductility reduction coefficient, so as to establish the seismic design method of eccentric structures based on strength reduction coefficient. The main research works are as follows: (1) Develop the axial force-moment interaction model (N-M model). Develop the restoring force model considering axial force-moment interaction based on VC++ platform and metal plasticity principle. Evaluate the validity and calculation of N-M model by analyzing RC frame structure model with actual earthquake damage records and a super high-rise building structure. The results show that N-M model can obtain more reliable results in structural elastoplastic analysis, and the calculation efficiency is much higher than that of fiber model or multi-spring model. The aseismic demand of single-story eccentric RC shear wall and frame structure subjected to impulsive earthquake is studied. The mechanism of the influence of different eccentric forms and axial forces on the aseismic demand of the structure is revealed, and the relative positions of the optimum strength center and stiffness center are discussed. The results show that the single-story eccentric RC shear wall and frame structure have greater elastic and elastic-plastic seismic requirements under the action of velocity pulse than under the action of non-velocity pulse. Stiffness eccentricity has the greatest influence on elastic-plastic seismic demand. It is suggested that the strength eccentricity should be added to the elastoplastic analysis as the criterion for judging the plane irregular structure. The relative position of the optimum strength-stiffness center of the response index is different, and the optimum strength center is between the center of mass and the center of rigidity. (3) The elastic-plastic seismic demand and seismic vulnerability of multi-story and high-rise eccentric RC frame structures subjected to strong velocity pulse earthquake are studied. Based on the N-M model, the elastic-plastic seismic demand of multi-storey eccentric RC frame is studied. The seismic vulnerability analysis method of eccentric structure is established. The dynamic time history analysis of multi-storey and high-rise eccentric RC frame structure is carried out 24,000 times, and the maximum inter-storey element displacement and delay are established. The results show that in the general multi-story eccentric system, the influence of the bottom eccentricity on the elastic-plastic seismic demand is greater than that of the other layers, and the uniform eccentricity of each layer is the worst. The multi-story eccentric frame structure under the action of velocity pulse earthquake is larger than that under the action of non-velocity pulse earthquake. With the increase of eccentricity, the exceeding probability of maximum displacement angle, ductility and torsion angle increases, and the influence of eccentricity on the exceeding probability of ductility is most obvious. (4) The correction method and fitting formula of ductility reduction coefficient of eccentric RC frame structure are established. The correction method of symmetrical structure ductility reduction coefficient R_ u applied to eccentric structure is presented. The influence of eccentricity, floor number, ductility level and velocity pulse seismic effect on correction coefficient is discussed. It is shown that the main factors affecting the correction factor are eccentricity, ductility level and velocity pulse seismic effect, and the influence of floor number is not obvious. On the basis of evaluating the present calculation methods of harmful interlayer displacement, the concepts of average interlayer shear deformation angle and average interlayer rotation angle are put forward, and the relationship between them is deduced and validated. The application of strength reduction coefficient R in the main international seismic design codes is evaluated, and eccentric RC is established. The seismic design method of frame structure based on strength reduction coefficient is presented and an example is given. The method is based on R-u-T relation, takes harmful displacement control as a reference method, takes acceptable failure probability as a guide, and takes eccentricity, vertical irregularity and velocity pulse effect into account. The strength reduction factor is considered more comprehensively.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TU375.4;TU352.11
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