【摘要】：工廠化生產(chǎn)、裝配程度提高是實(shí)現(xiàn)建筑產(chǎn)業(yè)現(xiàn)代化的重要途徑。傳統(tǒng)的裝配式結(jié)構(gòu)節(jié)點(diǎn)連接可靠性差,往往難以滿(mǎn)足反復(fù)荷載下的受力要求,且缺乏抗連續(xù)倒塌的能力。本文將預(yù)應(yīng)力技術(shù)應(yīng)用于預(yù)制裝配式混凝土結(jié)構(gòu),通過(guò)在節(jié)點(diǎn)區(qū)預(yù)壓連接,形成整體受力節(jié)點(diǎn)和連續(xù)受力框架,提高了裝配式結(jié)構(gòu)的魯棒性,改善了結(jié)構(gòu)的抗震性能,使得預(yù)制裝配式結(jié)構(gòu)在地震區(qū)能得到較好的應(yīng)用。本文通過(guò)對(duì)一榀單跨三層預(yù)壓裝配式預(yù)應(yīng)力混凝土框架擬動(dòng)力和擬靜力試驗(yàn),研究了預(yù)壓裝配式框架的動(dòng)力特性、承載能力、滯回性能、截面延性及耗能能力等抗震性能；采用有限元分析軟件對(duì)試驗(yàn)框架進(jìn)行彈性和彈塑性動(dòng)力時(shí)程分析和靜力彈塑性分析,進(jìn)一步探討了試驗(yàn)框架的抗震性能；并通過(guò)對(duì)一榀兩跨三層預(yù)壓裝配式混凝土框架的拉結(jié)法和拆除構(gòu)件法的數(shù)值模擬,探討了預(yù)壓裝配式框架的抗連續(xù)倒塌性能和倒塌機(jī)制。本文主要研究?jī)?nèi)容及成果如下。通過(guò)預(yù)壓裝配式框架進(jìn)行水平加載擬動(dòng)力試驗(yàn),獲得了不同加載工況下框架各層的位移時(shí)程曲線,恢復(fù)力時(shí)程曲線和位移-恢復(fù)力滯回曲線,得到不同工況條件下框架層間位移,層間位移角,層問(wèn)剪力。了解預(yù)壓裝配式框架的動(dòng)力性能、變形性能、剛度退化等抗震性能。試驗(yàn)框架在地震波峰值加速度PGA=102gal工況下,各層最大層間位移角為1/368,滿(mǎn)足“小震不壞”的要求；在PGA=204gal工況下,各層最大層間位移角為1/137,滿(mǎn)足“中震可修”的要求。通過(guò)預(yù)壓裝配式框架進(jìn)行水平加載擬靜力試驗(yàn),獲得了反復(fù)荷載下框架層間剪力-位移滯回曲線,以及框架梁端彎矩-轉(zhuǎn)角滯回曲線,了解了試驗(yàn)框架承載能力、滯回性能、截面延性及耗能能力等抗震性能�？蚣芮�,梁端率先出現(xiàn)塑性鉸,柱剛度尚未出現(xiàn)大的退化,預(yù)壓裝配式框架屬“強(qiáng)柱弱梁”型結(jié)構(gòu)。試驗(yàn)框架一二、三層層間極限位移角分別達(dá)到1/42、1/47、1/67,符合“大震不倒”的要求。一層、二層框架加載滯回曲線較為豐滿(mǎn),框架破壞時(shí)的粘滯阻尼系數(shù)he在0.065-0.087之間,具有良好的耗能能力。一層和二層梁端組合截面延性系數(shù)在3.64-5.62之間,具有較好的轉(zhuǎn)動(dòng)能力和延性。加載至極限狀態(tài),框架殘余變形率在0.138-0.307之間,結(jié)構(gòu)的變形恢復(fù)能力很好�？蚣芷茐那�,梁端塑性鉸發(fā)生充分轉(zhuǎn)動(dòng),預(yù)壓裝配式框架屬“強(qiáng)柱弱梁”型結(jié)構(gòu)。框架節(jié)點(diǎn)在豎向軸壓力和水平預(yù)應(yīng)力鋼筋預(yù)壓作用下處于雙向受壓狀態(tài),可滿(mǎn)足“強(qiáng)節(jié)點(diǎn)”的要求。采用SAP2000對(duì)試驗(yàn)框架做靜力彈塑性Pushover分析,得到框架的計(jì)算基底剪力-頂點(diǎn)位移關(guān)系曲線。對(duì)比框架的實(shí)測(cè)基底剪力-頂點(diǎn)位移關(guān)系曲線,框架正向加載和反向加載承載力實(shí)測(cè)值與計(jì)算值誤差分別為17.7%和1.4%,計(jì)算值與實(shí)測(cè)值吻合較好。在Pushover推覆分析過(guò)程中得到框架出現(xiàn)塑性鉸的位置及順序圖,框架塑性鉸先出現(xiàn)在底層梁端,再出現(xiàn)在上層梁端,最后出現(xiàn)在柱腳,表明該框架的破壞機(jī)制為整體屈服機(jī)制,具有良好的抗震性能。應(yīng)用有限元分析軟件MIDAS/Gen對(duì)試驗(yàn)框架進(jìn)行彈性動(dòng)力時(shí)程分析,得到試驗(yàn)框架的計(jì)算位移時(shí)程曲線,將計(jì)算位移與試驗(yàn)位移進(jìn)行比較,驗(yàn)證計(jì)算方法的可行性。選用框架進(jìn)行擬動(dòng)力試驗(yàn)時(shí)相同的地震波,調(diào)整峰值加速度強(qiáng)度,對(duì)試驗(yàn)框架進(jìn)行彈塑性動(dòng)力時(shí)程分析,得到了其彈塑性狀態(tài)下位移反應(yīng),在框架破壞時(shí),梁端的鉸狀態(tài)均達(dá)到Level-4狀態(tài),框架柱腳的鉸狀態(tài)達(dá)到Level-5狀態(tài),塑性鉸的延性系數(shù)均大于4,框架能夠滿(mǎn)足“強(qiáng)柱弱梁”的要求,具有良好的延性和耗能能力。通過(guò)對(duì)預(yù)壓裝配式預(yù)應(yīng)力混凝土框架的拉結(jié)強(qiáng)度設(shè)計(jì)和拆除構(gòu)件法設(shè)計(jì)的模擬,研究了預(yù)壓裝配式框架在不同工況下拆除失效柱后,剩余結(jié)構(gòu)的抗倒塌能力和抗連續(xù)倒塌機(jī)制。分析表明,預(yù)壓裝配式框架除頂層邊柱外,其余剩余結(jié)構(gòu)的穩(wěn)定性較好,抗倒塌能力很強(qiáng)。由于預(yù)應(yīng)力筋的存在,邊柱破壞時(shí),在小變形范圍內(nèi),框架梁以梁機(jī)制提供抗連續(xù)倒塌能力,在大變形范圍內(nèi),框架梁在此階段不能以懸鏈線機(jī)制提供抗連續(xù)倒塌能力。中柱破壞時(shí),框架梁均可通過(guò)梁機(jī)制或懸鏈線機(jī)制提供抗連續(xù)倒塌能力。
[Abstract]:The improvement of factory production and assembly degree is an important way to realize the modernization of building industry. the traditional assembled structure node has poor connection reliability, and is often difficult to meet the stress requirement under repeated loads and lacks the capability of resisting continuous collapse. in that pap, the pre-stress technology is applied to the prefabricated assembly concrete structure, the integral stress node and the continuous stress frame are formed by prepressing connection at the node area, the robustness of the fabricated structure is improved, the seismic performance of the structure is improved, so that the prefabricated assembled structure can obtain better application in the seismic area. In this paper, the dynamic characteristics, bearing capacity, hysteresis property, cross-section ductility and energy dissipation capability of pre-stressed assembled frame are studied by quasi-dynamic and quasi-static tests of a single span three-layer pre-stressed assembled pre-stressed concrete frame. In this paper, the elastic and elastic-plastic analysis of the test frame is carried out by using the finite element analysis software, and the seismic behavior of the test frame is further discussed. The anti-collapse performance and collapse mechanism of pre-stressed assembled frame are discussed. The main contents and achievements of this paper are as follows. Horizontal loading quasi-dynamic test is carried out through pre-pressing assembly frame, and displacement curve, restoring force and displacement-restoring force hysteresis curve of each layer of frame under different loading conditions are obtained, and displacement between frame layers under different working conditions is obtained, displacement angle between layers and shear force of layer are obtained. Understand the dynamic performance, deformation performance, rigidity degradation and other anti-seismic performance of pre-stressed assembled frame. The test frame has a displacement angle of 1/ 368 between the maximum layers of each layer under the condition of the peak acceleration of seismic wave (PGA = 102G), satisfying the requirement of the 鈥淭he small shock is not bad鈥，

本文編號(hào)：2291022