摇摆状态下古建筑木结构木柱受力性能分析及试验研究

发布时间：2018-05-10 07:19

本文选题：古建筑木结构 + 柱摇摆　；参考：《工程力学》2017年11期

【摘要】：在古建筑木结构中,木柱常常直接浮搁于础石上。在地震、风等反复荷载作用下,木柱会出现"摇摆"现象。木柱作为整体结构的主要承重部分,其在摇摆状态下受力性能对整体结构的稳定性和整体性有着重要的影响。为研究木柱在摇摆状态下的受力性能,该文首先提出摇摆运动机理,通过理论分析得到柱脚抬升判定条件;其次,参考《营造法式》制作了七等材木柱模型,通过低周反复荷载试验验证了柱脚抬升判定条件的正确性,研究了木柱的变形特征、柱头荷载位移滞回曲线、骨架曲线、抗侧能力、刚度退化规律等特性。试验结果表明:在反复荷载作用下,木柱出现摇摆现象,柱脚与础石接触部位存在木材受压变形。当柱头位移达到10 mm时,柱脚出现一侧抬升一侧受压现象。加载过程中,柱脚未滑移;木柱荷载位移滞回曲线呈S形,具有一定的捏拢效应;木柱初始抗侧刚度最大,其抗侧能力随柱头位移增大而逐渐减弱;在柱头位移达到60 mm之前,刚度退化较明显,随后刚度退化现象减弱。
[Abstract]:In ancient wooden structures, wooden columns often float directly on the foundation stone. In earthquake, wind and other repeated loads, wooden columns will appear "swing" phenomenon. As the main load-bearing part of the whole structure, the mechanical behavior of the timber column in the rocking state has an important influence on the stability and integrity of the whole structure. In order to study the mechanical behavior of wood columns in rocking state, the mechanism of rocking motion is put forward in this paper, and the judging conditions of column foot lifting are obtained by theoretical analysis. Secondly, the seventh grade timber column model is made with reference to "creating French style". The accuracy of the determination conditions of column foot uplift is verified by low cycle repeated load test. The characteristics of column deformation, column load displacement hysteretic curve, skeleton curve, lateral resistance and stiffness degradation are studied. The test results show that under repeated load, the timber column appears swaying phenomenon, and the wood deformation occurs in the contact part between the base stone and the column foot. When the displacement of the column is up to 10 mm, one side of the column foot is uplifted and the other side is under pressure. During the loading process, the column foot did not slip; the hysteretic curve of the column load displacement was S-shaped, which had a certain pinch effect; the initial lateral stiffness of the column was the largest, and its anti-lateral ability gradually weakened with the increase of the column displacement, and before the column displacement reached 60 mm, Stiffness degradation is obvious, and then stiffness degradation is weakened.
【作者单位】：北京交通大学土木建筑工程学院;北京交通大学结构风工程与城市风环境北京市重点实验室;重庆大学土木工程学院;
【基金】：国家自然科学基金青年科学基金项目(51408038);国家自然科学基金重点项目(51338001) 国家科技支撑计划项目(2015BAK01B02) 高等学校学科创新引智计划项目(B13002) 北京市自然科学基金重点项目(8151003)
【分类号】：TU366.2

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