单跨三层预压装配式预应力混凝土框架抗震性能试验与理论研究
发布时间：2018-10-24 09:42
【摘要】：工厂化生产、装配程度提高是实现建筑产业现代化的重要途径。传统的装配式结构节点连接可靠性差,往往难以满足反复荷载下的受力要求,且缺乏抗连续倒塌的能力。本文将预应力技术应用于预制装配式混凝土结构,通过在节点区预压连接,形成整体受力节点和连续受力框架,提高了装配式结构的鲁棒性,改善了结构的抗震性能,使得预制装配式结构在地震区能得到较好的应用。本文通过对一榀单跨三层预压装配式预应力混凝土框架拟动力和拟静力试验,研究了预压装配式框架的动力特性、承载能力、滞回性能、截面延性及耗能能力等抗震性能；采用有限元分析软件对试验框架进行弹性和弹塑性动力时程分析和静力弹塑性分析,进一步探讨了试验框架的抗震性能；并通过对一榀两跨三层预压装配式混凝土框架的拉结法和拆除构件法的数值模拟,探讨了预压装配式框架的抗连续倒塌性能和倒塌机制。本文主要研究内容及成果如下。通过预压装配式框架进行水平加载拟动力试验,获得了不同加载工况下框架各层的位移时程曲线,恢复力时程曲线和位移-恢复力滞回曲线,得到不同工况条件下框架层间位移,层间位移角,层问剪力。了解预压装配式框架的动力性能、变形性能、刚度退化等抗震性能。试验框架在地震波峰值加速度PGA=102gal工况下,各层最大层间位移角为1/368,满足“小震不坏”的要求；在PGA=204gal工况下,各层最大层间位移角为1/137,满足“中震可修”的要求。通过预压装配式框架进行水平加载拟静力试验,获得了反复荷载下框架层间剪力-位移滞回曲线,以及框架梁端弯矩-转角滞回曲线,了解了试验框架承载能力、滞回性能、截面延性及耗能能力等抗震性能。框架屈服后,梁端率先出现塑性铰,柱刚度尚未出现大的退化,预压装配式框架属“强柱弱梁”型结构。试验框架一二、三层层间极限位移角分别达到1/42、1/47、1/67,符合“大震不倒”的要求。一层、二层框架加载滞回曲线较为丰满,框架破坏时的粘滞阻尼系数he在0.065-0.087之间,具有良好的耗能能力。一层和二层梁端组合截面延性系数在3.64-5.62之间,具有较好的转动能力和延性。加载至极限状态,框架残余变形率在0.138-0.307之间,结构的变形恢复能力很好。框架破坏前,梁端塑性铰发生充分转动,预压装配式框架属“强柱弱梁”型结构。框架节点在竖向轴压力和水平预应力钢筋预压作用下处于双向受压状态,可满足“强节点”的要求。采用SAP2000对试验框架做静力弹塑性Pushover分析,得到框架的计算基底剪力-顶点位移关系曲线。对比框架的实测基底剪力-顶点位移关系曲线,框架正向加载和反向加载承载力实测值与计算值误差分别为17.7%和1.4%,计算值与实测值吻合较好。在Pushover推覆分析过程中得到框架出现塑性铰的位置及顺序图,框架塑性铰先出现在底层梁端,再出现在上层梁端,最后出现在柱脚,表明该框架的破坏机制为整体屈服机制,具有良好的抗震性能。应用有限元分析软件MIDAS/Gen对试验框架进行弹性动力时程分析,得到试验框架的计算位移时程曲线,将计算位移与试验位移进行比较,验证计算方法的可行性。选用框架进行拟动力试验时相同的地震波,调整峰值加速度强度,对试验框架进行弹塑性动力时程分析,得到了其弹塑性状态下位移反应,在框架破坏时,梁端的铰状态均达到Level-4状态,框架柱脚的铰状态达到Level-5状态,塑性铰的延性系数均大于4,框架能够满足“强柱弱梁”的要求,具有良好的延性和耗能能力。通过对预压装配式预应力混凝土框架的拉结强度设计和拆除构件法设计的模拟,研究了预压装配式框架在不同工况下拆除失效柱后,剩余结构的抗倒塌能力和抗连续倒塌机制。分析表明,预压装配式框架除顶层边柱外,其余剩余结构的稳定性较好,抗倒塌能力很强。由于预应力筋的存在,边柱破坏时,在小变形范围内,框架梁以梁机制提供抗连续倒塌能力,在大变形范围内,框架梁在此阶段不能以悬链线机制提供抗连续倒塌能力。中柱破坏时,框架梁均可通过梁机制或悬链线机制提供抗连续倒塌能力。
[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，
本文编号：2291022
[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，
本文编号：2291022
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