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  本文選題：預應力混凝土框架 + 強柱弱梁��； 參考：《華中科技大學》2016年碩士論文

【摘要】：預應力混凝土框架結構被廣泛地應用于要求大空間、大跨度的建筑結構中,對其抗震性能評價仍存在不少爭議,在罕遇地震時難以實現“強柱弱梁”的屈服機制。因此,本文對我國現行《預應力混凝土結構抗震設計規(guī)程》(JGJ140-2004)和《建筑抗震設計規(guī)范》(GB50011-2010)中“強柱弱梁”設計方法進行研究,給出各抗震等級預應力框架柱端彎矩調整方法及調整系數的建議取值,評估該系數對預應力框架抗震性能的影響,以期為04預應力規(guī)程的修訂提供參考依據。首先,闡述預應力混凝土框架抗震性能和“強柱弱梁”機制研究現狀,對影響預應力混凝土框架結構“強柱弱梁”屈服機制的因素進行分析,發(fā)現梁端實際抗震受彎承載力超強是預應力框架難以實現“強柱弱梁”的主要原因�；诖�,提出以梁端實際抗震受彎承載力調整柱端彎矩的設計方法。其次,參照現行規(guī)范設計7度0.1g區(qū)三層、六層PC框架和8度0.2g區(qū)三層、六層PC框架,在OpenSees平臺上建立各框架非線性模型,并驗證模型的準確性。建模時保證除底層柱底外,其它柱截面縱筋不屈服,通過模型在罕遇地震下各柱截面內力確定所需縱筋面積,進而確定所需的設計彎矩,求出各層節(jié)點處柱截面設計彎矩與梁端實際抗震受彎承載力比值。為考慮地震動的不確定性,各框架分別選取35條地震動記錄進行分析,對每條地震波結果進行統(tǒng)計分析,給出各抗震等級預應力框架柱端彎矩調整系數的建議取值。對抗震等級為三級PC框架,建議邊節(jié)點和中節(jié)點處分別取1.05、1.0;對抗震等級為二級PC框架,建議邊節(jié)點和中節(jié)點處分別取1.25、1.15;對抗震等級為一級PC框架,建議邊節(jié)點和中節(jié)點分別處取1.3、1.2。最后,對抗震等級分別為三級和二級的PC框架分別按建議取值和規(guī)范規(guī)定系數設計框架,通過靜力彈塑性分析、增量動力分析和易損性分析評估各框架抗震性能。結果表明,本文建議取值系數有助于提高PC框架抗震性能,實現“強柱弱梁”屈服機制。
[Abstract]:Prestressed concrete frame structures are widely used in buildings with large space and long span. There are still many controversies on the seismic performance evaluation of prestressed concrete frame structures. It is difficult to realize the yield mechanism of "strong columns and weak beams" in rare earthquakes. Therefore, this paper studies the design methods of "strong columns and weak beams" in the current Code for Seismic Design of Prestressed concrete structures (JGJ140-2004) and the Code for Seismic Design of buildings (GB50011-2010). In this paper, the methods of adjusting the bending moment at the end of the column and the suggested values of the adjustment coefficient are given, and the influence of the coefficient on the seismic behavior of the prestressed frame is evaluated, in order to provide a reference for the revision of the 04 prestress code. First of all, the aseismic behavior of prestressed concrete frame and the research status of "strong column and weak beam" mechanism are described, and the factors influencing the yield mechanism of "strong column and weak beam" of prestressed concrete frame structure are analyzed. It is found that the actual seismic and flexural bearing capacity at the end of the beam is very strong, which is the main reason why it is difficult for the prestressed frame to realize the "strong column and weak beam". Based on this, the design method of adjusting the bending moment of column end with the actual seismic flexural capacity of beam end is put forward. Secondly, according to the current specification, we design the three-layer frame of 7 degrees 0.1g, the frame of 6-layer PC, the three-layer frame of 8-degree 0.2g zone, and the six-layer PC frame. The nonlinear model of each frame is built on OpenSees platform and the veracity of the model is verified. When modeling, it is guaranteed that the longitudinal reinforcement of other column sections will not yield except the bottom column bottom, and the required longitudinal reinforcement area is determined by the internal force of each column section in the model under rare earthquake, and then the required design moment is determined. The ratio of the design moment of column section to the actual seismic flexural bearing capacity of beam end is obtained. In order to consider the uncertainty of ground motion, 35 seismic records are selected for each frame, and the results of each seismic wave are statistically analyzed, and the suggested values of the moment adjustment coefficient at the end of the column of each seismic grade prestressed frame are given. For the third grade PC frame, it is suggested that the edge node and the middle node should be 1.05U 1.0 respectively; for the second grade PC frame, 1.25 and 1.15 are recommended for the side node and the middle node; for the seismic grade, the first grade PC frame should be used. It is suggested that the side node and the middle node should be taken at 1.3 / 1.2 respectively. Finally, the design frame of PC frame with three and two seismic grades is designed according to the recommended values and the specified coefficients of the code, respectively. The seismic performance of each frame is evaluated by static elastic-plastic analysis, incremental dynamic analysis and vulnerability analysis. The results show that the proposed coefficient is helpful to improve the seismic performance of PC frame and realize the yield mechanism of "strong column and weak beam".
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TU378.4

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本文編號：2084655