【摘要】：預(yù)制裝配式混凝土框架結(jié)構(gòu)整體性能差、抗震效果不理想等不足，限制了該結(jié)構(gòu)體系在建筑工程中的大規(guī)模運用。為了提高預(yù)制裝配式混凝土框架結(jié)構(gòu)的抗震性能，同時保護其相對薄弱的框架節(jié)點，減緩及避免此類框架結(jié)構(gòu) 弱節(jié)點‖破壞模式的形成，提出了一種在預(yù)制裝配整體式混凝土框架梁柱節(jié)點中布置扇形鉛粘彈性阻尼器的新型結(jié)構(gòu)體系。為深入了解新型預(yù)制裝配式消能減震混凝土框架結(jié)構(gòu)體系的動力特性、抗震性能以及減震效果的影響規(guī)律進行了研究，主要內(nèi)容如下： （1）針對國內(nèi)外有關(guān)預(yù)制裝配式框架結(jié)構(gòu)的研究存在的不足，提出了新型預(yù)制裝配后澆整體式消能減震混凝土框架結(jié)構(gòu)體系，并對其節(jié)點構(gòu)造形式進行了設(shè)計。 （2）對布置了扇形鉛粘彈性阻尼器的新型預(yù)制裝配式消能減震混凝土框架結(jié)構(gòu)進行數(shù)值模擬分析，，研究了整體減震效果和節(jié)點內(nèi)力變化情況。經(jīng)受力分析表明：扇形鉛粘彈性阻尼器改善了預(yù)制裝配式結(jié)構(gòu)梁柱節(jié)點受力性能，提高節(jié)點承載力和剛度，增強整體結(jié)構(gòu)耗能減震能力。 （3）針對該新型預(yù)制裝配式消能減震混凝土框架結(jié)構(gòu)體系特點，設(shè)計了普通預(yù)制節(jié)點試件和新型預(yù)制節(jié)點試件，并進行了低周反復(fù)加載試驗，研究了節(jié)點破壞模式、滯回曲線、延性、強度和剛度退化程度、耗能性能及鋼筋應(yīng)變變化情況等抗震性能的差異。研究結(jié)果表明：附加扇形鉛粘彈性阻尼器的新型預(yù)制節(jié)點的滯回曲線飽滿，在耗能能力、極限承載力和位移延性方面大大高于普通預(yù)制節(jié)點，節(jié)點核心區(qū)應(yīng)變量相對減少，實現(xiàn)了 強節(jié)點弱構(gòu)件、強剪弱彎‖性能要求。 （4）在初步驗證新型節(jié)點有效性的基礎(chǔ)上，設(shè)計制作了兩組普通預(yù)制框架節(jié)點和新型預(yù)制框架節(jié)點，通過試驗研究進一步對比分析了在不同軸壓比作用下新型預(yù)制節(jié)點力學(xué)性能變化規(guī)律，研究結(jié)果表明：在高軸壓比作用下，普通預(yù)制節(jié)點和新型預(yù)制節(jié)點的耗能能力和剛度得到一定的提高，極限承載力和剛度及強度退化程度基本相同，但其位移延性明顯降低。設(shè)計了普通現(xiàn)澆框架節(jié)點和新型現(xiàn)澆框架節(jié)點，進行了試驗研究，驗證了附加扇形鉛粘彈性阻尼器的普通現(xiàn)澆框架節(jié)點的抗震性能差異，研究結(jié)果表明：新型現(xiàn)澆框架節(jié)點的剛度、極限承載力和位移延性等均得到一定程度提高，其滯回曲線飽滿平滑，耗能性能良好，但相比新型預(yù)制節(jié)點其滯回環(huán)較為狹長，阻尼器主要起了類似 掖撐‖提供剛度的作用。
[Abstract]:The performance of precast prefabricated concrete frame structure is poor, the seismic effect is not ideal and so on, which limits the large-scale application of the structure system in building engineering. In order to improve the seismic performance of precast prefabricated concrete frame structure and protect its relatively weak frame joints, and to slow down and avoid the formation of the failure mode of this kind of frame structure, A new type of structural system with sector lead viscoelastic dampers in precast assembled integral concrete frame Liang Zhu joints is presented in this paper. In order to deeply understand the dynamic characteristics, seismic performance and the influence law of shock absorption effect of the new precast prefabricated energy dissipation concrete frame structure system, The main contents are as follows: (1) in view of the shortcomings of the research on prefabricated frame structures at home and abroad, a new type of precast assembly post-cast-in-situ concrete frame structure system for energy dissipation and shock absorption is proposed. The structure of the joints is designed. (2) numerical simulation analysis of a new precast prefabricated concrete frame structure with lead viscoelastic dampers is carried out. The effect of the whole damping and the change of the internal force of the joint are studied. The stress analysis shows that the fan lead viscoelastic damper can improve the mechanical performance of the prefabricated Liang Zhu joints and increase the bearing capacity and stiffness of the joints. (3) according to the characteristics of the new precast prefabricated energy dissipation concrete frame structure, the common prefabricated joint specimen and the new prefabricated joint specimen are designed. Low cycle repeated loading tests were carried out to study the seismic behavior of joints such as failure mode hysteretic curve ductility strength and stiffness degradation energy dissipation performance and strain change of steel bar. The results show that the hysteretic curves of the new prefabricated joints with sector lead viscoelastic dampers are full, and the hysteretic curves of the prefabricated joints are much higher than those of the conventional prefabricated joints in terms of energy dissipation capacity, ultimate bearing capacity and displacement ductility. The performance requirements of strong joints and weak members are achieved. (4) on the basis of preliminary verification of the effectiveness of the new type of joints, two groups of common prefabricated frame joints and new prefabricated frame joints are designed and manufactured. The mechanical properties of the new prefabricated joints under different axial compression ratios are further compared and analyzed through the experimental study. The results show that: under the high axial compression ratio, The energy dissipation capacity and stiffness of common prefabricated joints and new prefabricated joints are improved to a certain extent, and the ultimate bearing capacity, stiffness and strength degradation degree are basically the same, but their displacement ductility is obviously reduced. The common cast-in-place frame joints and the new cast-in-place frame joints are designed. The experimental results show that the seismic behavior of the common cast-in-place frame joints with sector lead viscoelastic dampers is different. The results show that the stiffness, ultimate bearing capacity and displacement ductility of the new cast-in-place frame joints are improved to a certain extent, the hysteretic curves are full and smooth, the energy dissipation performance is good, but the hysteretic loop is longer and narrower than the new prefabricated joints. Dampers mainly play a similar role in providing stiffness.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU37;TU352.1

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