基于最佳側(cè)移剛度分布的多高層鋼.doc
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基于最佳側(cè)移剛度分布的多高層鋼,摘要結(jié)構(gòu)的抗震設(shè)計(jì)應(yīng)全面注重結(jié)構(gòu)的性能、安全及經(jīng)濟(jì)等諸多方面。而傳統(tǒng)的結(jié)構(gòu)設(shè)計(jì)方法往往偏于保守和安全，材料性能沒(méi)有得到充分的發(fā)揮。本文研究的目的就是在保證結(jié)構(gòu)抗震性能的前提下，降低建造的費(fèi)用，提高設(shè)計(jì)質(zhì)量和水平。本文從能量的角度，通過(guò)優(yōu)化布置結(jié)構(gòu)側(cè)移剛度研究結(jié)構(gòu)構(gòu)件截面分布規(guī)律，避免結(jié)構(gòu)損傷集中，從而使結(jié)構(gòu)達(dá)到最佳的抗...
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摘 要
結(jié)構(gòu)的抗震設(shè)計(jì)應(yīng)全面注重結(jié)構(gòu)的性能、安全及經(jīng)濟(jì)等諸多方面。而傳統(tǒng)的結(jié)構(gòu)設(shè)計(jì)方法往往偏于保守和安全，材料性能沒(méi)有得到充分的發(fā)揮。本文研究的目的就是在保證結(jié)構(gòu)抗震性能的前提下，降低建造的費(fèi)用，提高設(shè)計(jì)質(zhì)量和水平。
本文從能量的角度，通過(guò)優(yōu)化布置結(jié)構(gòu)側(cè)移剛度研究結(jié)構(gòu)構(gòu)件截面分布規(guī)律，避免結(jié)構(gòu)損傷集中，從而使結(jié)構(gòu)達(dá)到最佳的抗震性能。目前國(guó)內(nèi)外關(guān)于這方面的研究還非常少。
地震響應(yīng)分析是結(jié)構(gòu)抗震性能分析與設(shè)計(jì)的基礎(chǔ)。目前，時(shí)程分析法對(duì)于重要建筑物的抗震分析已成為一種重要方法。我國(guó)現(xiàn)行《建筑抗震設(shè)計(jì)規(guī)范（GB50011-2001）》規(guī)定，時(shí)程分析法用于結(jié)構(gòu)在地震作用下的破壞機(jī)理和改進(jìn)抗震設(shè)計(jì)方法的研究。另外，推覆分析法和日本著名學(xué)者秋山宏提出的基于能量平衡的設(shè)計(jì)法也是獲得必要地震響應(yīng)值的有效方法。
基于上述背景，本文采用時(shí)程分析法結(jié)合SAP2000有限元分析軟件，研究多高層鋼框架結(jié)構(gòu)的最佳側(cè)移剛度和最佳截面慣性矩的分布規(guī)律，提出設(shè)計(jì)方法。并利用推覆分析法和能量預(yù)測(cè)法驗(yàn)算結(jié)果的合理性。
首先，建立多高層鋼框架算例模型，以罕遇地震作用下結(jié)構(gòu)各層累計(jì)塑性變形倍率相等為目標(biāo)，利用地震響應(yīng)彈塑性時(shí)程方法研究結(jié)構(gòu)模型最佳側(cè)移剛度和最佳截面慣性矩的分布規(guī)律，提出多高層鋼結(jié)構(gòu)的最佳側(cè)移剛度和最佳截面慣性矩的分布式。
其次，建立不同側(cè)移剛度分布的算例模型，對(duì)本文所揭示的最佳側(cè)移剛度和截面慣性矩分布規(guī)律進(jìn)行驗(yàn)證，提出基于最佳側(cè)移剛度分布的多高層鋼框架結(jié)構(gòu)的抗震設(shè)計(jì)方法。
最后，以12層設(shè)計(jì)模型為例，利用推覆分析法和基于能量平衡的設(shè)計(jì)方法計(jì)算設(shè)計(jì)算例的地震響應(yīng)值并進(jìn)行分析比較，考察本文提出的抗震設(shè)計(jì)方法的可靠性以及在罕遇地震作用下結(jié)構(gòu)的地震響應(yīng)。
關(guān)鍵詞 抗震設(shè)計(jì)；最佳側(cè)移剛度分布；彈塑性時(shí)程分析；推覆分析法；能量預(yù)測(cè)法
ABSTRACT
Seismic design should full focus on structural performance,security,economy and so on. But traditional seismic design usually biased in favor of conservative and security, material properties will not been fully exploited. The purpose of this study is in ensuring the seismic performance of the premise, reduce the cost of construction, Improve the quality and level of design method.
In order to achieve the best seismic performance of structures,this article studies the sections’ distribution of structural members to avoid the concentration of structural damage by arranging structural stiffness optimal from the perspective of energy. Research in this regard at home and abroad is still very small at present.
Seismic performance analysis and design based on the earthquake response of the structures. The time history analysis method has become an important method for seismic analysis of important buildings at present. It is showed in Code for seismic design of buildings that the time history analysis method is used for research on structural damage mechanism under the earthquake and to improve seismic design method. In addtion, pushover analysis procedure and energy method proposed by Akiyama are also effective methods to obtain the necessary earthquake response of the structures.
Based on above background, this paper uses the time history analysis method and SAP2000 to study optimum lateral stiffness distribution and optimum moment of inertia ratio of steel structures, at the same time, a new design method is proposed. Besides, pushover analysis procedure and energy method are used to validate the goodness of the new design method.
Firstly, multi-storey steel structures are designed. In order to make the cumulative plastic deformation ratio of each storey equivalent under rare earthquake, time history analysis method is used to study the optimum lateral stiffness distribution and the optimum moment of inertia of steel structures. At the same time, formulas of the optimum lateral stiffness distribution and the optimum moment of inertia of steel structures distribution are proposed.
Secondly, different kinds of lateral stiffness distribution models are designed to vertify the rightness of the optimum distribution of lateral stiffness and the optimum moment of inertia. Based on the optimum distribution of stiffness and the optimum moment of inertia, a new design method of multi-storey steel structures based on the optimum lateral stiffness distribution is proposed.
At last, In order to validate the goodness of the new design method, 12-storey models are designed, pushover analysis procedure and energy method are used to study the earthquake response of the structures.
Keywords seismic design; optimum lateral stiffness distribution; time-history analysis; pushover analysis procedure; energy method
目 錄
摘 要 I
ABSTRACT III
第1章 緒 論 1
1.1 引言 1
1.2 結(jié)構(gòu)抗震設(shè)計(jì)課題的國(guó)內(nèi)外研究現(xiàn)狀 1
1.2.1 結(jié)構(gòu)抗震設(shè)計(jì)思想發(fā)展 2
1.2.2 多高層建筑結(jié)構(gòu)地震作用計(jì)算方法 2
1.3 大型有限元軟件SAP2000簡(jiǎn)介 3
1.4 本文的研究目的和意義以及主要工作內(nèi)容 4
第2章 推覆分析法 6
2.1 推覆分析法基本思路 6
2.2 推覆分析法基本過(guò)程 7
2.2.1 損傷極限強(qiáng)度的驗(yàn)證 7
2.2.2 安全極限強(qiáng)度的驗(yàn)證 10
2.2.3 罕遇地震時(shí)結(jié)構(gòu)真實(shí)響應(yīng)值的計(jì)算 11
2.3 本章小結(jié) 13
第3章 能量預(yù)測(cè)法 14
3.1 能量平衡的基本方程 14
3.2 設(shè)計(jì)用能量譜 15
3.3 抗震結(jié)構(gòu)的地震反應(yīng)預(yù)測(cè)式 18-br..
結(jié)構(gòu)的抗震設(shè)計(jì)應(yīng)全面注重結(jié)構(gòu)的性能、安全及經(jīng)濟(jì)等諸多方面。而傳統(tǒng)的結(jié)構(gòu)設(shè)計(jì)方法往往偏于保守和安全，材料性能沒(méi)有得到充分的發(fā)揮。本文研究的目的就是在保證結(jié)構(gòu)抗震性能的前提下，降低建造的費(fèi)用，提高設(shè)計(jì)質(zhì)量和水平。
本文從能量的角度，通過(guò)優(yōu)化布置結(jié)構(gòu)側(cè)移剛度研究結(jié)構(gòu)構(gòu)件截面分布規(guī)律，避免結(jié)構(gòu)損傷集中，從而使結(jié)構(gòu)達(dá)到最佳的抗震性能。目前國(guó)內(nèi)外關(guān)于這方面的研究還非常少。
地震響應(yīng)分析是結(jié)構(gòu)抗震性能分析與設(shè)計(jì)的基礎(chǔ)。目前，時(shí)程分析法對(duì)于重要建筑物的抗震分析已成為一種重要方法。我國(guó)現(xiàn)行《建筑抗震設(shè)計(jì)規(guī)范（GB50011-2001）》規(guī)定，時(shí)程分析法用于結(jié)構(gòu)在地震作用下的破壞機(jī)理和改進(jìn)抗震設(shè)計(jì)方法的研究。另外，推覆分析法和日本著名學(xué)者秋山宏提出的基于能量平衡的設(shè)計(jì)法也是獲得必要地震響應(yīng)值的有效方法。
基于上述背景，本文采用時(shí)程分析法結(jié)合SAP2000有限元分析軟件，研究多高層鋼框架結(jié)構(gòu)的最佳側(cè)移剛度和最佳截面慣性矩的分布規(guī)律，提出設(shè)計(jì)方法。并利用推覆分析法和能量預(yù)測(cè)法驗(yàn)算結(jié)果的合理性。
首先，建立多高層鋼框架算例模型，以罕遇地震作用下結(jié)構(gòu)各層累計(jì)塑性變形倍率相等為目標(biāo)，利用地震響應(yīng)彈塑性時(shí)程方法研究結(jié)構(gòu)模型最佳側(cè)移剛度和最佳截面慣性矩的分布規(guī)律，提出多高層鋼結(jié)構(gòu)的最佳側(cè)移剛度和最佳截面慣性矩的分布式。
其次，建立不同側(cè)移剛度分布的算例模型，對(duì)本文所揭示的最佳側(cè)移剛度和截面慣性矩分布規(guī)律進(jìn)行驗(yàn)證，提出基于最佳側(cè)移剛度分布的多高層鋼框架結(jié)構(gòu)的抗震設(shè)計(jì)方法。
最后，以12層設(shè)計(jì)模型為例，利用推覆分析法和基于能量平衡的設(shè)計(jì)方法計(jì)算設(shè)計(jì)算例的地震響應(yīng)值并進(jìn)行分析比較，考察本文提出的抗震設(shè)計(jì)方法的可靠性以及在罕遇地震作用下結(jié)構(gòu)的地震響應(yīng)。
關(guān)鍵詞 抗震設(shè)計(jì)；最佳側(cè)移剛度分布；彈塑性時(shí)程分析；推覆分析法；能量預(yù)測(cè)法
ABSTRACT
Seismic design should full focus on structural performance,security,economy and so on. But traditional seismic design usually biased in favor of conservative and security, material properties will not been fully exploited. The purpose of this study is in ensuring the seismic performance of the premise, reduce the cost of construction, Improve the quality and level of design method.
In order to achieve the best seismic performance of structures,this article studies the sections’ distribution of structural members to avoid the concentration of structural damage by arranging structural stiffness optimal from the perspective of energy. Research in this regard at home and abroad is still very small at present.
Seismic performance analysis and design based on the earthquake response of the structures. The time history analysis method has become an important method for seismic analysis of important buildings at present. It is showed in Code for seismic design of buildings that the time history analysis method is used for research on structural damage mechanism under the earthquake and to improve seismic design method. In addtion, pushover analysis procedure and energy method proposed by Akiyama are also effective methods to obtain the necessary earthquake response of the structures.
Based on above background, this paper uses the time history analysis method and SAP2000 to study optimum lateral stiffness distribution and optimum moment of inertia ratio of steel structures, at the same time, a new design method is proposed. Besides, pushover analysis procedure and energy method are used to validate the goodness of the new design method.
Firstly, multi-storey steel structures are designed. In order to make the cumulative plastic deformation ratio of each storey equivalent under rare earthquake, time history analysis method is used to study the optimum lateral stiffness distribution and the optimum moment of inertia of steel structures. At the same time, formulas of the optimum lateral stiffness distribution and the optimum moment of inertia of steel structures distribution are proposed.
Secondly, different kinds of lateral stiffness distribution models are designed to vertify the rightness of the optimum distribution of lateral stiffness and the optimum moment of inertia. Based on the optimum distribution of stiffness and the optimum moment of inertia, a new design method of multi-storey steel structures based on the optimum lateral stiffness distribution is proposed.
At last, In order to validate the goodness of the new design method, 12-storey models are designed, pushover analysis procedure and energy method are used to study the earthquake response of the structures.
Keywords seismic design; optimum lateral stiffness distribution; time-history analysis; pushover analysis procedure; energy method
目 錄
摘 要 I
ABSTRACT III
第1章 緒 論 1
1.1 引言 1
1.2 結(jié)構(gòu)抗震設(shè)計(jì)課題的國(guó)內(nèi)外研究現(xiàn)狀 1
1.2.1 結(jié)構(gòu)抗震設(shè)計(jì)思想發(fā)展 2
1.2.2 多高層建筑結(jié)構(gòu)地震作用計(jì)算方法 2
1.3 大型有限元軟件SAP2000簡(jiǎn)介 3
1.4 本文的研究目的和意義以及主要工作內(nèi)容 4
第2章 推覆分析法 6
2.1 推覆分析法基本思路 6
2.2 推覆分析法基本過(guò)程 7
2.2.1 損傷極限強(qiáng)度的驗(yàn)證 7
2.2.2 安全極限強(qiáng)度的驗(yàn)證 10
2.2.3 罕遇地震時(shí)結(jié)構(gòu)真實(shí)響應(yīng)值的計(jì)算 11
2.3 本章小結(jié) 13
第3章 能量預(yù)測(cè)法 14
3.1 能量平衡的基本方程 14
3.2 設(shè)計(jì)用能量譜 15
3.3 抗震結(jié)構(gòu)的地震反應(yīng)預(yù)測(cè)式 18-br..
