本文選題：鋼管混凝土樁 + 累積損傷　； 參考：《西安工業(yè)大學(xué)》2015年碩士論文

【摘要】：由于良好的力學(xué)性能和抗震性能,鋼管混凝土樁作為一種組合設(shè)計(jì)形式在地震區(qū)建筑中得到了廣泛應(yīng)用。對(duì)鋼管混凝土樁抗震性能的研究一直是國(guó)內(nèi)外的研究熱點(diǎn),許多研究者通過(guò)抗震試驗(yàn)對(duì)鋼管混凝土的抗震性能進(jìn)行了探討。但是大部分研究者的側(cè)重點(diǎn)都是放在鋼管混凝土的承載力、滯回性能以及建立滯回模型的研究上,很少考慮地震作用下鋼管混凝土樁的疲勞損傷,以及由于疲勞損傷的累積而導(dǎo)致的鋼管混凝土的累積損傷破壞。本文針對(duì)鋼管混凝土樁在地震荷載下的力學(xué)性能和疲勞累積損傷問(wèn)題進(jìn)行了數(shù)值模擬較為系統(tǒng)的理論分析。模擬結(jié)果表明鋼管混凝土具有良好的抗震滯回性能和耗能能力,即使鋼管混凝土產(chǎn)生了較大的變形也不會(huì)發(fā)生嚴(yán)重的承載力退化現(xiàn)象。鋼管混凝土樁滯回曲線(xiàn)的荷載和剛度退化隨著側(cè)移率的增大而加快,說(shuō)明在較大的變形條件下,往復(fù)變形一次對(duì)鋼管混凝土造成的損傷也大；隨著側(cè)移率的減小,鋼管混凝土的滯回耗能能力明顯增強(qiáng)。研究表明,承受低周往復(fù)荷載作用的鋼管混凝土樁在破壞時(shí)鋼管斷裂處的應(yīng)變并沒(méi)有達(dá)到單調(diào)拉伸時(shí)的極限應(yīng)變,鋼管是在拉應(yīng)力和壓應(yīng)力的反復(fù)作用下產(chǎn)生了疲勞損傷,當(dāng)鋼管的損傷累積到一定程度時(shí),最終發(fā)生疲勞斷裂。本文建立了反映鋼管混凝土樁低周疲勞壽命的改進(jìn)Manson-Coffin關(guān)系模型,得出了鋼管混凝土樁變形和疲勞壽命的關(guān)系曲線(xiàn)。與前人試驗(yàn)數(shù)據(jù)相比,理論曲線(xiàn)能夠比較合理地反映這幾類(lèi)鋼管混凝土樁在不同變形條件下的疲勞壽命。綜合Miner的線(xiàn)性累積損傷理論和鋼管混凝土樁的循環(huán)耗能規(guī)律,建立了鋼管混凝土樁的基于耗能的改進(jìn)線(xiàn)性累積損傷模型�；谶B續(xù)介質(zhì)損傷力學(xué)的基本理論和鋼管混凝土的彈塑性分析,建立了鋼管混凝土構(gòu)件在單調(diào)荷載和低周往復(fù)荷載下的簡(jiǎn)化損傷梁?jiǎn)卧Ｐ?該損傷模型形式簡(jiǎn)單,具有明確的物理和力學(xué)意義,比較適合用于地震作用下的鋼管混凝土樁的損傷分析。
[Abstract]:Because of good mechanical and seismic performance, concrete filled steel tube piles have been widely used in seismic area buildings as a combination design form. The research on seismic performance of concrete filled steel tube piles has been a hot topic at home and abroad. Many researchers have studied the seismic performance of steel tube concrete through seismic test. Most of the researchers focus on the bearing capacity of the concrete filled steel tube, the hysteretic behavior and the establishment of the hysteretic model, which seldom consider the fatigue damage of the concrete filled steel tube pile under the earthquake action, and the cumulative damage and damage of the concrete filled steel tube caused by the cumulative fatigue damage. The numerical simulation results show that the concrete filled steel tube has good seismic hysteretic performance and energy dissipation capacity. Even if the concrete filled steel tube has a larger deformation, it will not have serious bearing capacity degradation. The concrete filled steel tube pile is stagnant. The load and stiffness degradation of the back curve speed up with the increase of the lateral displacement, which indicates that under the larger deformation conditions, the damage of the concrete filled steel tube caused by reciprocating deformation is also great. With the decrease of the lateral displacement, the hysteretic energy dissipation capacity of the concrete is obviously enhanced. The research shows that the concrete filled steel tube pile under the low cycle reciprocating load is shown. The strain at the fracture of the steel pipe did not reach the limit strain at the time of monotonous tensile. The steel pipe produced fatigue damage under the repeated action of tensile stress and compressive stress. When the damage of the steel pipe accumulated to a certain extent, the fatigue fracture eventually occurred. This paper established an improved Manson-Cof to reflect the low cycle fatigue life of the steel pipe concrete pile. The relationship curve between the deformation and fatigue life of the concrete filled steel tube pile is obtained by the fin relation model. Compared with the previous experimental data, the theoretical curve can reasonably reflect the fatigue life of the concrete filled steel tube piles under different deformation conditions. The linear cumulative damage theory of Miner and the cyclic energy dissipation law of the concrete filled steel tube pile are built. An improved linear cumulative damage model based on energy dissipation is established for concrete filled steel tube piles. Based on the basic theory of continuous medium damage mechanics and elastoplastic analysis of concrete filled steel tubes, a simplified model of damaged beam element is established for concrete filled steel tubular members under monotonic load and low cycle reciprocating load. The damage model is simple and has a definite form. Physical and mechanical significance is more suitable for damage analysis of concrete-filled steel tubular piles under earthquake.

【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU435;TU473.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 劉陽(yáng)冰;劉晶波;;基于彈塑性損傷單元的RC框架結(jié)構(gòu)的全過(guò)程分析[J];地震工程與工程振動(dòng);2006年06期

，

本文編號(hào)：1787604