本文選題：近海大氣 + 銹蝕梁柱節(jié)點��； 參考：《西安建筑科技大學》2014年碩士論文

【摘要】：鋼筋混凝土框架結構是使用最廣泛的結構類型之一，隨著齡期的增長，耐久性損傷加劇，使得結構性能退化。因此，要準確地評估結構在地震作用下的性能，有必要考慮其耐久性損傷，這也是準確進行城市多齡期建筑易損性及災后損失評估的基礎。 近海大氣環(huán)境下，氯離子濃度較高，對鋼筋的侵蝕嚴重，鋼筋銹蝕成為近海大氣環(huán)境下結構破壞的首要因素，本文采用人工氣候加速銹蝕試驗來模擬氯離子侵蝕環(huán)境下鋼筋混凝土結構的加速劣化，結果表明本文所采用的加速銹蝕方案可以較好地模擬氯離子侵蝕環(huán)境下結構的劣化。 分析RC框架結構時，節(jié)點區(qū)域通常采用傳統(tǒng)的中心線模型，對于新建結構來說，這樣處理偏于安全，但隨著結構齡期增長，鋼筋發(fā)生銹蝕，尤其是節(jié)點區(qū)域，配筋復雜，銹蝕狀況相對于梁、柱構件要嚴重的多，此時若不考慮節(jié)點區(qū)域變形，可能使得結構分析產(chǎn)生誤差。因此，本文設計了6個梁柱組合體，進行人工氣候快速銹蝕試驗研究，結果表明：節(jié)點核心區(qū)的箍筋銹蝕程度明顯比梁、柱構件縱筋嚴重，銹蝕使得節(jié)點的延性、剛度、耗能發(fā)生退化，軸壓比對銹蝕節(jié)點的影響規(guī)律與完好節(jié)點一致，即提高承載力，降低延性。并定量分析了銹蝕程度及軸壓比對梁柱節(jié)點宏觀力學性能的影響。 在試驗的基礎上，得到了不同銹蝕程度下，，節(jié)點核心區(qū)域在不同受力狀態(tài)下的剪力及剪切變形，通過試驗數(shù)據(jù)的擬合分析得到了核心區(qū)域剪力及剪切變形隨箍筋銹蝕率及軸壓比的變化曲線，將基于變形和能量的退化系數(shù)引入銹蝕節(jié)點的滯回規(guī)則，確立了銹蝕節(jié)點的恢復力模型。 在總結現(xiàn)有節(jié)點宏觀模型及試驗現(xiàn)象的基礎上，提出一個節(jié)點簡化宏觀模型，將本文建立的恢復力模型應用于此模型中，對比分析了傳統(tǒng)中心線模型和節(jié)點建模下，結構遭遇罕遇地震時，位移響應差異。結果表明：與完好結構相比，銹蝕RC框架結構頂點位移隨著銹蝕率的增大而增大，隨著銹蝕加劇底層的增大速度偏大，在銹蝕率較小時，結構的層間位移角仍能夠滿足限值要求；隨著銹蝕率的增大，節(jié)點區(qū)域銹蝕更為嚴重且結構底部節(jié)點變形較大，使得結構底端層間位移增長速度明顯高于頂端，結構薄弱層下移。總體來說，銹蝕會引起結構反應增大，銹蝕嚴重時，有必要采取節(jié)點區(qū)域建模來考慮節(jié)點變形對銹蝕RC框架整體抗震性能的影響。
[Abstract]:Reinforced concrete frame structure is one of the most widely used structural types. With the increase of age, the durability damage intensifies and the performance of the structure degenerates. Therefore, it is necessary to consider the durability damage in order to accurately evaluate the performance of structures under earthquake, which is also the basis for accurate assessment of vulnerability and post-disaster loss of urban multi-age buildings. In the offshore atmospheric environment, the chloride ion concentration is relatively high, the corrosion of steel bar is serious, the corrosion of steel bar becomes the primary factor of the structural damage in the offshore atmospheric environment. In this paper, the accelerated corrosion test in artificial climate is used to simulate the accelerated deterioration of reinforced concrete structures under chloride ion erosion. The results show that the accelerated corrosion scheme adopted in this paper can well simulate the deterioration of structures under chloride ion erosion. In the analysis of RC frame structure, the traditional centerline model is usually used in the joint area. For the newly built structure, it is safe to deal with this problem, but with the increase of the age of the structure, the reinforcement corrosion occurs, especially in the joint area, the reinforcement is complicated. The corrosion condition of column member is much more serious than that of beam. If the deformation of joint area is not considered at this time, it may make the structure analysis error. Therefore, six Liang Zhu assemblages are designed and studied in artificial climate. The results show that the corrosion degree of stirrups in the core region of joints is more serious than that of beams, and the corrosion of columns makes the ductility and stiffness of joints. The effect of axial compression ratio on energy dissipation is consistent with that of intact joints, that is, the bearing capacity is increased and the ductility is reduced. The effects of corrosion degree and axial compression ratio on the macroscopic mechanical properties of Liang Zhu joints were analyzed quantitatively. On the basis of the experiment, the shear force and shear deformation of the core region of the node under different stress conditions are obtained under different corrosion degrees. Through the fitting analysis of test data, the curves of shear force and shear deformation of core region with the corrosion rate of stirrups and axial compression ratio are obtained. The degenerative coefficients based on deformation and energy are introduced into the hysteretic rules of corroded joints. The restoring force model of corroded joints is established. On the basis of summing up the existing macroscopic model of node and experimental phenomena, a simplified macroscopic model of node is put forward, and the restoring force model established in this paper is applied to this model, and the traditional centerline model and node model are compared and analyzed. When the structure encounters rare earthquake, the displacement response is different. The results show that the vertex displacement of corroded RC frame structure increases with the increase of corrosion rate, and the increase speed of bottom layer is larger with the increase of corrosion rate, and the corrosion rate is smaller than that of intact structure. The interstory displacement angle of the structure can still meet the limit requirement. With the increase of corrosion rate, the corrosion in the joint area is more serious and the deformation of the bottom joint of the structure is larger, which makes the growth speed of the displacement between the layers at the bottom of the structure obviously higher than that at the top. The weak layer of the structure moves down. In general, the corrosion will cause the structural response to increase. When the corrosion is serious, it is necessary to take the joint region modeling to consider the effect of joint deformation on the overall seismic performance of corroded RC frame.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU375.4;TU352.11

【相似文獻】

相關期刊論文 前10條

1 胡學元;預應力混凝土超長懸臂梁節(jié)點區(qū)受力性能的探討[J];安徽建筑;2005年02期

2 郭智峰;門進杰;史慶軒;王秋維;李坤;;鋼筋混凝土柱-鋼梁組合節(jié)點力學性能初探[J];土木工程學報;2013年S1期

3 王松帆,湯華;框架頂層中節(jié)點的受力特點及其設計方法[J];西北建筑工程學院學報(自然科學版);2001年01期

4 石啟印;耿平平;李愛群;秦衛(wèi)紅;;外包鋼—混凝土組合梁與鋼筋混凝土柱節(jié)點的非線性分析[J];四川建筑科學研究;2012年02期

5 陳慶軍,蔡健,林遙明,梁劍,唐澤東;柱鋼管不直通的新型鋼管混凝土柱-梁節(jié)點(I)——軸壓下采用鋼筋網(wǎng)加強鋼管不直通的節(jié)點區(qū)的性能[J];華南理工大學學報(自然科學版);2002年09期

6 吳濤,劉伯權,白國良,李紅星,朱佳寧;工業(yè)廠房框架異型節(jié)點破壞機理和設計方法研究[J];工業(yè)建筑;2005年07期

7 余瓊;李思明;;框架偏心節(jié)點反復荷載下的受力性能[J];同濟大學學報(自然科學版);2006年04期

8 陳慶軍;蔡健;徐剛;吳軼;;節(jié)點區(qū)柱鋼管不全貫通式鋼管混凝土柱-梁節(jié)點區(qū)的受壓試驗研究[J];華南理工大學學報(自然科學版);2008年06期

9 邢國華;劉伯權;吳濤;陸本燕;;鋼筋混凝土框架變梁中節(jié)點特性分析[J];工業(yè)建筑;2010年11期

10 吳濤;劉伯權;邢國華;姚顯貴;楊樂;;RC框架變梁變柱中節(jié)點抗裂性能試驗[J];長安大學學報(自然科學版);2009年04期

相關會議論文 前2條

1 周中科;崔佳;;加豎桿的空間KK型無搭接節(jié)點的靜力性能研究[A];第九屆全國現(xiàn)代結構工程學術研討會論文集[C];2009年

2 李翠光;廖功華;顧曉付;劉明月;甘國軍;;上海環(huán)球金融中心超高層摩天大樓的多節(jié)點桁架制作技術探討[A];第二屆全國鋼結構施工技術交流會論文集[C];2008年

相關重要報紙文章 前1條

1 新疆恒達建設工程有限責任公司 李山;現(xiàn)澆鋼筋混凝土節(jié)點施工質量通病及防治[N];博爾塔拉報;2008年

相關碩士學位論文 前10條

1 謝佳;Y形分岔變截面梁構件性能試驗研究[D];重慶大學;2016年

2 劉小銳;人工氣候下銹蝕RC框架節(jié)點抗震性能試驗研究[D];西安建筑科技大學;2014年

3 姚顯貴;RC框架變梁變柱異型中節(jié)點抗震性能試驗研究[D];長安大學;2009年

4 楊志娟;鉆石鳥嘴式K型節(jié)點靜力性能分析[D];西安建筑科技大學;2013年

5 王華明;考慮節(jié)點變形的鋼筋混凝土平面框架彈塑性抗震分析[D];天津大學;2007年

6 吳娜;超高層混凝土結構夾心節(jié)點非線性有限元分析[D];武漢科技大學;2014年

7 陳曦;鋼筋混凝土框架全錯開節(jié)點擬靜力試驗與錯層節(jié)點非線性有限元分析[D];重慶大學;2002年

8 田必云;鋼筋混凝土框架錯層節(jié)點的擬靜力試驗研究[D];重慶大學;2002年

9 朱蘭影;鋼筋混凝土框架完全錯開300mm節(jié)點擬靜力試驗與非線性有限元分析[D];重慶大學;2004年

10 鄭柏青;鋼筋混凝土框架變梁節(jié)點的試驗研究與有限元分析[D];長安大學;2010年

本文編號：2116760