【摘要】：塑性鉸理論是結(jié)構(gòu)非線性分析的基礎(chǔ)理論,鋼筋混凝土結(jié)構(gòu)在塑性鉸產(chǎn)生后,其變形內(nèi)力會(huì)受到顯著的影響�；诖�,國(guó)內(nèi)外許多學(xué)者對(duì)塑性鉸的性質(zhì)開展了大量的研究工作,并得出了一些鋼筋混凝土結(jié)構(gòu)塑性鉸長(zhǎng)度的計(jì)算方法。但是目前關(guān)于塑性鉸長(zhǎng)度的研究基本都是基于實(shí)心截面的,而關(guān)于箱形截面的研究還不是很多。鋼筋混凝土箱形結(jié)構(gòu)因其優(yōu)越的空間受力性能在高墩結(jié)構(gòu)中有廣泛的應(yīng)用前景,因此對(duì)影響鋼筋混凝土箱形結(jié)構(gòu)塑性鉸長(zhǎng)度因素的研究是必要的。本文通過(guò)ABAQUS有限元軟件分析研究了軸壓比、截面尺寸、剪跨比、體積配箍率、縱筋配筋率等五個(gè)因素對(duì)塑性鉸長(zhǎng)度影響,以及軸壓比、剪跨比、體積配箍率等因素對(duì)塑性鉸區(qū)域抗剪強(qiáng)度的影響,具體結(jié)論如下:(1)當(dāng)軸壓比小于0.3時(shí),鋼筋混凝土箱形柱的塑性鉸長(zhǎng)度隨著軸壓比的增大而增大;當(dāng)軸壓比大于0.3時(shí),塑性鉸長(zhǎng)度的變化趨勢(shì)不明顯;截面尺寸的變化對(duì)塑性鉸長(zhǎng)度影響較大,隨著加載方向截面寬度和橫橋向壁厚比的增大而減小,縱橋向壁厚比對(duì)塑性鉸長(zhǎng)度影響不明顯;箱形柱的塑性鉸長(zhǎng)度隨著體積配箍率的增加而增加;在較低的軸壓水平下,縱筋配筋率的提高能夠較為顯著的提高箱形柱的塑性鉸長(zhǎng)度,若軸壓較大時(shí),縱筋率的變化對(duì)塑性鉸長(zhǎng)度的影響可以忽略。(2)有限元分析結(jié)果與Paulay建議公式、《歐洲建筑工程設(shè)計(jì)規(guī)范》、袁必果公式、我國(guó)《公路橋梁抗震設(shè)計(jì)細(xì)則》計(jì)算公式的計(jì)算結(jié)果較為接近,模擬結(jié)果與計(jì)算結(jié)果的比值均在0.8左右,可以采用這些公式計(jì)算鋼筋混凝土箱形柱的塑性鉸長(zhǎng)度,并且具有一定的安全儲(chǔ)備。根據(jù)有限元分析結(jié)果采用數(shù)據(jù)分析軟件,總結(jié)出了適合本文中模型塑性鉸長(zhǎng)度計(jì)算的公式,并進(jìn)行了驗(yàn)證。(3)箱形柱塑性鉸區(qū)域的抗剪強(qiáng)度隨著軸壓比的增大而增大;隨著剪跨比的增大,箱形柱的抗剪強(qiáng)度有較大幅度的下降;塑性鉸區(qū)域的抗剪強(qiáng)度隨著模型體積配箍率的提高而提高。
[Abstract]:The theory of plastic hinge is the basic theory of structural non-linear analysis. Based on this, many scholars at home and abroad have carried out a lot of research on the properties of plastic hinge, and the calculation method of the plastic hinge length of some reinforced concrete structures is obtained. However, the present study on the length of plastic hinge is based on solid section, and the study on box section is not much. The reinforced concrete box-like structure has a wide application prospect in the structure of the high-pier because of its superior space-bearing performance, so it is necessary to study the factors that influence the plastic hinge length of the reinforced concrete box-like structure. The influence of five factors such as axial compression ratio, cross section size, shear span ratio, volume ratio and reinforcement ratio of longitudinal bar on the length of plastic hinge, as well as the influence of axial compression ratio, shear span ratio, volume ratio and other factors on the shear strength of plastic hinge region are studied by means of ABAQUS finite element software. The concrete conclusions are as follows: (1) when the axial compression ratio is less than 0.3, the plastic hinge length of the reinforced concrete box-shaped column is increased with the increase of the axial compression ratio; when the axial compression ratio is greater than 0.3, the change trend of the plastic hinge length is not obvious; and the variation of the cross-sectional dimension greatly influences the length of the plastic hinge, with the increase of the cross-section width of the loading direction and the thickness ratio of the transverse bridge to the wall thickness, the influence of the longitudinal bridge to the wall thickness is not obvious to the length of the plastic hinge; the length of the plastic hinge of the box-shaped column is increased with the increase of the volume ratio; at the lower axial compression level, The improvement of the reinforcement ratio of the longitudinal bar can improve the plastic hinge length of the box-shaped column obviously, and if the axial compression is large, the influence of the variation of the longitudinal reinforcement ratio on the length of the plastic hinge can be neglected. (2) The results of the finite element analysis and the formula of Paay's recommendation, the Code for Design of the European Construction Engineering and the Yuan Biguo's formula, the calculation results of the formula for the anti-seismic design of the highway bridge in our country are close, and the ratio of the simulation results to the calculation results is about 0.8. These formulas can be used to calculate the plastic hinge length of the reinforced concrete box-shaped column and have a certain safety reserve. Based on the results of the finite element analysis, the formula for calculating the plastic hinge length of the model in this paper is summarized, and the verification is carried out. (3) The shear strength of the plastic hinge region of the box-shaped column is increased with the increase of the axial compression ratio; with the increase of the shear span ratio, the shear strength of the box-shaped column is greatly reduced; and the shear strength of the plastic hinge region is improved with the increase of the volume ratio of the model.
【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU375

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本文編號(hào)：2510942