發(fā)布時(shí)間：2018-06-14 18:56

  本文選題：鋼筋混凝土 + 二階效應(yīng)　； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：談到二階效應(yīng)，人們通常提及的是承載力極限狀態(tài)下結(jié)構(gòu)的二階效應(yīng)。從國(guó)內(nèi)外20世紀(jì)至今較為集中的研究來看，也主要是針對(duì)承載力極限狀態(tài)下結(jié)構(gòu)二階效應(yīng)的研究。但隨著現(xiàn)代化工業(yè)的發(fā)展，混凝土結(jié)構(gòu)朝大跨度、大空間方向發(fā)展，加之高強(qiáng)鋼筋逐漸普及化的使用，使得正常使用極限狀態(tài)逐漸成為結(jié)構(gòu)設(shè)計(jì)的控制指標(biāo)。因此研究二階效應(yīng)在正常使用極限狀態(tài)下對(duì)結(jié)構(gòu)的影響規(guī)律就顯得非常必要了。本論文基于標(biāo)準(zhǔn)規(guī)范科研項(xiàng)目“對(duì)《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》GB50010-2010二階效應(yīng)設(shè)計(jì)方法后續(xù)問題的研究”的遺留問題之一展開進(jìn)一步的研究工作，，即該規(guī)范中正常使用極限狀態(tài)下偏心受壓構(gòu)件最大裂縫寬度計(jì)算中考慮二階效應(yīng)方法與承載力極限狀態(tài)下考慮二階效應(yīng)方法的嚴(yán)重脫節(jié)。為了解決這種同一本規(guī)范在兩種狀態(tài)下考慮二階效應(yīng)方法的嚴(yán)重脫節(jié)，本論文主要作了如下幾點(diǎn)工作及探討： （1）歸納總結(jié)我國(guó)1989年版、2002年版及2010年版規(guī)范及規(guī)程在承載力極限狀態(tài)下對(duì)二階效應(yīng)的考慮和正常使用極限狀態(tài)下偏心受壓構(gòu)件最大裂縫寬度驗(yàn)算時(shí)對(duì)二階效應(yīng)考慮的規(guī)定，說明了這幾版規(guī)范中有關(guān)二階效應(yīng)規(guī)定的特點(diǎn)，對(duì)各版規(guī)范及規(guī)程有關(guān)二階效應(yīng)的背景情況進(jìn)行分析和理解。對(duì)2010年版規(guī)范中二階效應(yīng)設(shè)計(jì)方法的后續(xù)問題進(jìn)行了歸納，指出在正常使用極限狀態(tài)下極易造成工程界誤解至今未糾正的考慮二階效應(yīng)的條文規(guī)定，說明規(guī)范中驗(yàn)算偏壓構(gòu)件最大裂縫寬度時(shí)考慮二階效應(yīng)方法的不合理。 （2）歸納總結(jié)了鋼筋混凝土構(gòu)件裂縫研究的背景知識(shí)，通過分析說明應(yīng)用混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范偏心受壓構(gòu)件最大裂縫寬度計(jì)算公式驗(yàn)算偏心受壓構(gòu)件最大裂縫寬度所需的前提條件。 （3）對(duì)變形裂縫專題研究組負(fù)責(zé)單位當(dāng)時(shí)進(jìn)行的一系列混凝土偏心受壓柱裂縫試驗(yàn)進(jìn)行歸納總結(jié)。在試驗(yàn)數(shù)據(jù)的基礎(chǔ)上，用混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范最大裂縫寬度計(jì)算公式對(duì)這一系列偏心受壓柱的最大裂縫寬度進(jìn)行驗(yàn)算并與試驗(yàn)數(shù)據(jù)對(duì)比分析。 （4）建立正常使用極限狀態(tài)下柱子裂縫寬度驗(yàn)算時(shí)需考慮二階效應(yīng)的結(jié)構(gòu)模型，對(duì)該結(jié)構(gòu)在正常使用極限狀態(tài)下的柱子裂縫進(jìn)行分析。用2010年版規(guī)范裂縫寬度計(jì)算公式對(duì)柱子的裂縫寬度進(jìn)行驗(yàn)算，并對(duì)驗(yàn)算結(jié)果進(jìn)行分析總結(jié)。 （5）用有限元分析軟件ETABS9.7.4對(duì)二階效應(yīng)在正常使用極限狀態(tài)下對(duì)結(jié)構(gòu)的影響規(guī)律進(jìn)行了分析，同時(shí)對(duì)2010年版規(guī)范中在正常使用極限狀態(tài)下采用η-l0法考慮二階效應(yīng)的適用性進(jìn)行了考察。 （6）通過歸納、總結(jié)、理論分析后提出三種可供規(guī)范組選用的正常使用極限狀態(tài)下驗(yàn)算偏心受壓構(gòu)件最大裂縫寬度時(shí)考慮二階效應(yīng)的設(shè)計(jì)條文建議。
[Abstract]:When it comes to the second order effect, people usually refer to the second order effect of the structure under the ultimate state of bearing capacity. The research on the second order effect of the structure under the ultimate bearing capacity is also the focus of the domestic and foreign researches in the 20th century. But with the development of modern industry, the concrete structure is developing towards the direction of large span and large space, and the use of high strength steel bar is popularizing gradually, which makes the limit state of normal use gradually become the control index of structural design. Therefore, it is necessary to study the influence of the second order effect on the structure under the normal limit state. This thesis is based on one of the remaining problems of the second order effect design method of GB 50010-2010, which is one of the scientific research projects of the standard code for the design of concrete structures. That is, the second order effect method is considered in the calculation of the maximum crack width of eccentrically compressed members in the normal use limit state of the code and the second order effect method is considered in the limit state of bearing capacity. In order to solve the serious disconnection between the second order effect method of this same specification in two states, The main work of this paper is as follows: 1) summarize the second order effect and normal use limit state of the codes and regulations in China's 1989 edition, 2002 edition and 2010 edition under the limit state of bearing capacity. The rules of considering the second order effect when checking the maximum crack width of down-eccentrically compressed members, This paper explains the characteristics of the second-order effect in these editions, and analyzes and understands the background of the second-order effect in each edition of the specification and the rules. This paper sums up the following problems of the second-order effect design method in the 2010 edition of the Code, and points out that under the normal limit state of use, it is easy to cause misunderstandings in the engineering circles so far and the provisions considering the second-order effect are not corrected. This paper illustrates the irrationality of the second-order effect method in checking the maximum crack width of the biasing member in the code. Through analysis, the prerequisite for calculating the maximum crack width of eccentrically compressed members by using the calculation formula of maximum crack width of eccentrically compressed members in the code for design of concrete structures is explained. A series of concrete eccentrically compressed column cracking tests were conducted at that time. Based on the experimental data, The maximum crack width of this series of eccentrically compressed columns is calculated by calculating the maximum crack width formula of concrete structure design code and compared with the test data. The second order effect structural model should be taken into account when checking the crack width. The crack of the column in the normal service limit state of the structure is analyzed. The crack width of the column is checked with the formula for calculating the crack width of the 2010 edition of the standard. The results of checking calculation are analyzed and summarized. (5) the influence of second-order effect on the structure under the limit state of normal use is analyzed by using the finite element analysis software ETABS9.7.4. At the same time, the applicability of 畏 -l0 method to consider the second order effect in the standard of 2010 edition is investigated. After theoretical analysis, three kinds of design provisions which can be selected by the code group to consider the second order effect in checking the maximum crack width of eccentrically compressed members under the limit state of normal use are proposed.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU311.4

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本文編號(hào)：2018618