發(fā)布時(shí)間：2018-04-28 21:35

  本文選題：強(qiáng)柱弱梁 + 現(xiàn)澆樓板��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：我國(guó)的抗震規(guī)范利用“能力設(shè)計(jì)”原理來保證按多遇水準(zhǔn)地震效應(yīng)設(shè)計(jì)的結(jié)構(gòu)在更高水準(zhǔn)地震作用下的抗震性能�！皬�(qiáng)柱弱梁”這一抗震措施就是“能力設(shè)計(jì)”原理在工程設(shè)計(jì)中的應(yīng)用之一。 “強(qiáng)柱弱梁”的目的是使框架結(jié)構(gòu)在強(qiáng)震下形成具有較好抗震性能的穩(wěn)定的屈服后塑性耗能機(jī)構(gòu)，并避免結(jié)構(gòu)形成同層所有柱端均同時(shí)出現(xiàn)同一轉(zhuǎn)動(dòng)方向塑性鉸的層側(cè)移機(jī)構(gòu)。然而，實(shí)際震害表明，受到不同程度損傷或損毀的鋼筋混凝土框架結(jié)構(gòu)，幾乎全是以柱端塑性鉸區(qū)的形式出現(xiàn)。與縱向梁平行的現(xiàn)澆樓板鋼筋會(huì)參與抵抗負(fù)彎矩，這就使得現(xiàn)行的梁板分離式設(shè)計(jì)嚴(yán)重低估了梁端實(shí)際抗負(fù)彎矩能力，這是“強(qiáng)柱弱梁”的目的不能實(shí)現(xiàn)的重要原因之一。 國(guó)內(nèi)外眾多研究者對(duì)這一問題進(jìn)行了試驗(yàn)或模擬分析研究，提出了用有效翼緣寬度來量化現(xiàn)澆板鋼筋對(duì)梁端負(fù)彎矩承載力的增強(qiáng)效應(yīng)，但有效翼緣寬度的建議取值方案不盡相同。這些研究部分是對(duì)帶現(xiàn)澆樓板的節(jié)點(diǎn)進(jìn)行試驗(yàn)或數(shù)值模擬，然而，節(jié)點(diǎn)不具有實(shí)際框架中板的邊界約束條件，故以此來定量研究梁板協(xié)同工作是不可取的。以框架結(jié)構(gòu)為對(duì)象的研究中，只有少量研究者采用試驗(yàn)方法或用三維實(shí)體單元對(duì)其進(jìn)行精細(xì)化的非彈性模擬分析，但是這些研究者提出的有效翼緣寬度取值方案都不盡完善，或是沒有考慮足夠的節(jié)點(diǎn)類型，或是沒有考慮諸如梁跨度和梁截面高度這類因素的影響。目前，我國(guó)工程設(shè)計(jì)界對(duì)有效翼緣寬度的取值沒有統(tǒng)一的標(biāo)準(zhǔn)，，該問題還處于研究階段。 針對(duì)上述實(shí)際情況，本論文在閱讀了大量文獻(xiàn)的基礎(chǔ)上，采用三維實(shí)體單元（模擬混凝土）和三維桁架單元（模擬鋼筋）對(duì)水平荷載作用下的框架結(jié)構(gòu)進(jìn)行精細(xì)化的彈性及非彈性分析。本論文的主要工作及成果簡(jiǎn)述如下： ①運(yùn)用ABAQUS程序?qū)前搴蜔o樓板鋼筋混凝土單層單跨空間框架結(jié)構(gòu)進(jìn)行彈性分析，并且對(duì)比分析結(jié)果。結(jié)果表明，現(xiàn)澆樓板增強(qiáng)了框架結(jié)構(gòu)抵抗水平位移的能力，并且增強(qiáng)了縱向梁的抗彎剛度和抗彎強(qiáng)度。針對(duì)帶樓板的框架結(jié)構(gòu)，改變其現(xiàn)澆樓板厚度、混凝土強(qiáng)度等級(jí)、縱向梁剛度和橫向梁剛度，通過與原結(jié)構(gòu)對(duì)比樓板鋼筋的應(yīng)變來研究這些因素對(duì)板筋參與梁端抗彎程度的影響。得到結(jié)論，縱向梁剛度對(duì)板筋參與梁端抵抗負(fù)彎矩的程度影響最大，其次是橫向梁剛度，再次是樓板厚度，最后是混凝土強(qiáng)度等級(jí)（只提高一級(jí)），并且這幾個(gè)因素的影響方式也各不相同。 ②運(yùn)用ABAQUS程序?qū)前搴蜔o樓板鋼筋混凝土單層單跨空間框架結(jié)構(gòu)進(jìn)行非彈性分析，并且對(duì)比分析結(jié)果。結(jié)果表明，現(xiàn)澆樓板增強(qiáng)了框架結(jié)構(gòu)抵抗水平位移的能力，也增強(qiáng)了縱向梁的抗彎剛度和抗彎強(qiáng)度，特別是增強(qiáng)了梁負(fù)彎矩區(qū)的抗彎強(qiáng)度，并且這種增強(qiáng)效應(yīng)在結(jié)構(gòu)受力響應(yīng)的非彈性程度越深的時(shí)候表現(xiàn)得越明顯。所以，現(xiàn)澆樓板對(duì)框架梁乃至整個(gè)框架結(jié)構(gòu)的影響是不容忽視的。 ③針對(duì)帶樓板的單層單跨空間框架結(jié)構(gòu)，詳細(xì)研究結(jié)構(gòu)不同水平位移下樓板鋼筋應(yīng)力的橫向（垂直于水平荷載作用方向）分布。結(jié)果表明，樓板鋼筋的應(yīng)力隨著與縱向梁距離的增大而減小，板頂鋼筋的拉應(yīng)力整體上比板底鋼筋的大，樓板鋼筋的應(yīng)力在整體上隨結(jié)構(gòu)水平位移的變大而增大，當(dāng)結(jié)構(gòu)的層間位移角達(dá)到1/35，樓板鋼筋的應(yīng)力整體上趨于穩(wěn)定。 ④將ABAQUS的分析模型從單層單跨空間框架結(jié)構(gòu)擴(kuò)展到包含更多節(jié)點(diǎn)類型的單層兩跨空間框架結(jié)構(gòu)，繼而發(fā)展到涵蓋所有常見節(jié)點(diǎn)類型的兩層兩跨空間框架結(jié)構(gòu)。得到不同結(jié)構(gòu)中不同節(jié)點(diǎn)處樓板鋼筋應(yīng)力的分布規(guī)律。通過對(duì)比這些規(guī)律可知，節(jié)點(diǎn)類型對(duì)樓板鋼筋應(yīng)力的大小及分布影響較大，即對(duì)有效翼緣寬度的影響較大，應(yīng)該將分析模型選定為包含節(jié)點(diǎn)類型全面的結(jié)構(gòu)。 ⑤針對(duì)兩層兩跨空間框架結(jié)構(gòu)，通過改變其縱向梁跨度和截面高度來研究這兩個(gè)因素對(duì)有效翼緣寬度的影響。結(jié)果表明，隨著縱向梁跨度的增加，有效翼緣寬度增大；縱向梁截面高度對(duì)有效翼緣寬度的影響沒有較好的規(guī)律。于是，將縱向梁跨度作為基本參數(shù)來描述結(jié)構(gòu)層間位移角為1/35時(shí)各節(jié)點(diǎn)的有效翼緣寬度。
[Abstract]:The seismic behavior of our country uses the principle of " ability design " to guarantee the seismic behavior of the structure under the action of higher standard seismic effect . The seismic design of " strong column weak beam " is one of the application of " capability design " principle in engineering design .

The purpose of the " strong column weak beam " is to make the frame structure form a stable yielding plastic energy dissipation mechanism with better seismic performance under strong earthquake , and to avoid the formation of the lateral displacement mechanism of plastic hinge at the same time . However , the actual earthquake damage indicates that the reinforced concrete frame structure with different degree of damage or damage appears in the form of plastic hinge area at the end of the column . The cast - in - place floor steel bar parallel to the longitudinal beam can participate in the resistance to negative bending moment , which makes the existing beam plate separation design seriously undervaluation the actual negative bending moment capacity of the beam end , which is one of the important reasons why the purpose of the " strong column weak beam " cannot be realized .

In this paper , it is not advisable to quantify the bearing capacity of cast - in - place slabs with effective flange width . However , it is not advisable to quantify the effective flange width .

In view of the above - mentioned practical situation , this paper is based on a large number of literatures , and adopts three - dimensional solid unit ( simulated concrete ) and three - dimensional truss unit ( simulated steel bar ) to carry out fine elastic and inelastic analysis on the frame structure under the action of horizontal load . The main work and results of this paper are as follows :

The results show that the cast - in - place floor slab enhances the frame structure ' s ability to resist horizontal displacement and enhances the flexural rigidity and bending strength of the longitudinal beam .

The results show that the cast - in - place floor slab enhances the flexural rigidity and bending strength of the longitudinal beam , especially the bending strength of the beam negative bending moment area , and the reinforcement effect is more obvious when the non - elastic degree of the structural stress response is deeper . Therefore , the influence of the cast - in - situ floor on the frame beam and the whole frame structure cannot be ignored .

( 3 ) According to the single - layer single - span spatial frame structure with floor slab , the transverse ( perpendicular to horizontal load acting direction ) distribution of the floor steel bar stress at different horizontal displacement is studied in detail . The results show that the stress of the slab reinforcement decreases as the distance from the longitudinal beam increases , and the stress of the reinforced bar of the slab increases as the displacement of the horizontal displacement of the structure increases . When the displacement angle between the layers of the structure reaches 1 / 35 , the stress of the floor steel bar is stabilized .

In this paper , the analysis model is extended from single - layer single - span spatial frame structure to single - layer two - span spatial frame structure containing more node types , which is then developed to two - layer two - span spatial frame structure covering all common node types .

The influence of these two factors on the effective flange width is studied by changing its longitudinal beam span and cross section height for two - layer two - span spatial frame structure . The results show that the effective flange width increases with the increase of the span of the longitudinal beam ;
The effect of the longitudinal beam cross - section height on the effective flange width is not good . Then , the longitudinal beam span is used as the basic parameter to describe the effective flange width of each node when the displacement angle between the structural layers is 1 / 35 .

【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)】：TU375.1

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本文編號(hào)：1817003