【摘要】：隨著城市化和新農(nóng)村建設(shè)的推進,人口老齡化的加劇,我國對建筑行業(yè)轉(zhuǎn)型建筑工業(yè)化的要求迫在眉睫。預(yù)制裝配式建筑抗震性能的不確定性是其在發(fā)展中的瓶頸,且構(gòu)件連接節(jié)點是預(yù)制裝配結(jié)構(gòu)體系抗震的薄弱環(huán)節(jié),因此,開發(fā)出即能滿足裝配式抗震要求,又能實現(xiàn)標(biāo)準(zhǔn)化的連接形式,是發(fā)展預(yù)制裝配式建造方式的關(guān)鍵環(huán)節(jié)之一。本文針對以往傳統(tǒng)結(jié)點存在的不足,提出預(yù)制裝配式鋼筋混凝土結(jié)構(gòu)新型梁—梁結(jié)合點。該結(jié)合點的特色在于裝配梁結(jié)合點位于跨中截面,梁兩端對稱分布,可減少預(yù)制梁構(gòu)件的長度,更方便安裝及成批預(yù)制生產(chǎn)。因裝配節(jié)點位于梁跨中截面,梁底部拉應(yīng)力最大,且鋼筋主要承受拉力,所以鋼筋的連接是該結(jié)合點的主要控制因素,總結(jié)各種鋼筋連接技術(shù)的優(yōu)缺點,從安全及經(jīng)濟的角度出發(fā),確定選用半套筒灌漿連接。為研究半套筒灌漿連接柱的承載能力和抗震性能,首先利用ABAQUS有限元軟件建立精細(xì)化鋼筋半套筒灌漿連接柱模型,在低周反復(fù)荷載作用下,對比模型的破壞形態(tài)、滯回曲線、骨架曲線等參數(shù),驗證模型的正確性。并在此基礎(chǔ)上以軸壓比為變量進行模擬試驗,得出隨著軸壓比的增加,柱骨架鋼筋應(yīng)力及承載力加大,但構(gòu)件延性和耗能性能降低;并提出該種裝配式節(jié)點最大軸壓比應(yīng)略低于《建筑抗震設(shè)計規(guī)范》規(guī)定的限值。根據(jù)《R-PC的設(shè)計》和《預(yù)制裝配整體式鋼筋混凝土結(jié)構(gòu)技術(shù)規(guī)范》,以一級抗震設(shè)防等級為背景,設(shè)計一 RC框架梁,建立結(jié)合點位置不同及鋼筋連接形式不同的模型,得出本文梁豎向結(jié)合部設(shè)計滿足抗震要求,對梁-梁結(jié)合點進行參數(shù)分析,探討了包括后澆區(qū)配箍率、鋼筋強度、混凝土強度等參數(shù)對結(jié)合點在循環(huán)荷載作用下承載力及滯回性能的影響,根據(jù)分析結(jié)果對結(jié)合點的抗震設(shè)計提出建議。
[Abstract]:With the development of urbanization and the construction of new countryside and the aggravation of aging population, it is urgent for our country to transform the construction industry. The uncertainty of seismic performance of prefabricated building is the bottleneck in its development, and the connection joint is the weak link of earthquake resistance of precast assembly structure system. Therefore, the development of prefabricated building can meet the requirements of prefabricated aseismic design. It is one of the key links to develop prefabricated construction mode to realize standardized connection form. In view of the shortcomings of the traditional joints in the past, a new type of beam-beam joint of prefabricated reinforced concrete structures is proposed in this paper. The characteristic of the joint point is that the assembly beam joint point is located in the middle section of the span, and the two ends of the beam are symmetrically distributed, which can reduce the length of the precast beam members and facilitate installation and batch production. Because the assembly joint is located in the middle section of the beam span, the tensile stress at the bottom of the beam is the largest, and the steel bar is mainly subjected to tensile force, so the connection of the steel bar is the main controlling factor of the joint point, and the advantages and disadvantages of various kinds of steel bar connection technology are summarized. From the point of view of safety and economy, the selection of semi-sleeve grouting connection is determined. In order to study the bearing capacity and seismic behavior of semi-sleeve grouting connecting column, the model of reinforced semi-sleeve grouting connection column is established by using ABAQUS finite element software. Under low-cycle repeated load, the failure pattern and hysteretic curve of the model are compared. Skeleton curve and other parameters to verify the correctness of the model. On this basis, the axial compression ratio is taken as the variable to carry out the simulation test. It is concluded that with the increase of the axial compression ratio, the stress and bearing capacity of the column skeleton steel increase, but the ductility and energy dissipation performance of the members decrease. It is also proposed that the maximum axial compression ratio of the assembled joints should be slightly lower than the limit specified in the Code for Seismic Design of buildings. According to "Design of R-PC" and "Technical Specification for prefabricated Assembly integral reinforced concrete structures", a RC frame beam is designed against the background of the first grade seismic fortification grade, and a model with different joint points and different forms of reinforcement connection is established. It is concluded that the vertical joint design of the beam meets the seismic requirements, and the parameters of the beam-beam joint point are analyzed, including the hoop ratio in the post-pouring area and the strength of the steel bar. The influence of concrete strength and other parameters on the bearing capacity and hysteretic behavior of the joint points under cyclic load is discussed. Based on the analysis results, some suggestions are put forward for the seismic design of the joint points.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU375;TU352.11

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