单、双跨木结构抗震性能模拟研究

发布时间：2018-06-22 02:19

本文选题：燕尾榫 + 单跨、双跨木结构　；参考：《太原理工大学》2017年硕士论文

【摘要】：中国木结构古建筑精巧的外观、复杂的组合形式和优良的抗震性能,无不向后人展示着古人的智慧、传递着中华民族的文化。研究木结构的抗震性能,对于保护木结构古建筑是非常有必要的。许多木结构古建筑均为多跨结构形式,而目前学界多针对单跨木构架进行研究,较少涉及双跨及多跨木构架结构性能,其相关的受力性能及抗震性能需要进一步研究。本文基于樟子松材料性能试验,以《营造法式》中四等材木构架为原型,利用有限元软件Abaqus建立了燕尾榫榫头尺寸不同的三种单跨木构架模型及有、无斗拱的单、双跨木构架模型,并对其进行模拟计算分析。对三种燕尾榫榫头尺寸不同的单跨木构架在不同的柱顶配重下进行了拟静力试验模拟研究,了解其在水平位移往复加载下的结构变形特征,根据模拟结果得出了结构的P-?滞回曲线、骨架曲线、刚度退化曲线,建立了单跨木构架的恢复力模型。分析结果表明木结构具有良好的滞回耗能性能,且随着柱顶配重的增大,结构的抗侧移刚度和总耗能增大。燕尾榫榫头尺寸变化会影响结构的抗侧移刚度:榫头较小时由于柱顶截面变化,增大了对榫头的握持力,结构抗侧移刚度大于榫头较大的木构架;而燕尾榫端部有微小缝隙时,其骨架曲线与燕尾榫端部无缝隙木构架的骨架曲线接近重合。对有、无斗拱的单、双跨木构架在不同配重下进行了拟静力及动力试验模拟。分析了四种木构架在低周变幅往复加载下的滞回特性,对其骨架曲线进行了对比。在El Centro地震波作用下,得出了位于结构不同高度处相对位移时程曲线、加速度时程曲线。结果表明结构的地震响应会受到结构顶部配重的影响:结构上、下部分的相对位移峰值随配重增大而增大;结构顶部的加速度时程曲线的周期随配重的增大而增大。对比了单、双跨木构架在El Centro地震波荷载下结构相对位移响应。无斗拱双跨木构架结构最高点柱顶相对底板位移峰值在柱均配重为3t时大于无斗拱单跨木构架柱顶相对底板位移峰值,而当柱均配重增大到6和9时,无斗拱双跨木构架的柱顶相对底板位移峰值小于无斗拱单跨柱顶相对底板位移峰值。带斗拱的双跨木构架在三级配重下结构最高点耍头相对底板位移峰值均大于带斗拱单跨木构架相应值。
[Abstract]:The delicate appearance, complex combination form and excellent seismic performance of the ancient Chinese wooden structure show the wisdom of the ancients and the culture of the Chinese nation. It is necessary to study the seismic performance of wood structure to protect the ancient building of wood structure. Many ancient wooden structures are multi-span structures, but at present, the academic circles mostly focus on the single span wooden frame, less about the performance of double-span and multi-span wooden frame, and the related mechanical performance and seismic performance need to be further studied. Based on the material performance test of Pinus sylvestris var. mongolica, taking the middle and fourth grade wood frame as the prototype, using the finite element software Abaqus, three kinds of single span wood frame models with different sizes of tenon and tenon are established, and the single frame with no bucket arch is established. The model of double span wood frame is simulated and analyzed. In this paper, three kinds of single span wooden frames with different tenon and tenon sizes are simulated by pseudostatic test under different column top weight, and the structural deformation characteristics under reciprocating loading of horizontal displacement are understood. According to the simulation results, the structure P-? Hysteretic curve, skeleton curve and stiffness degradation curve are used to establish the restoring force model of single span wood frame. The results show that wood structure has good hysteretic energy dissipation performance, and with the increase of column top weight, the anti-lateral stiffness and total energy dissipation increase. The change of the size of the tenon and tenon will affect the lateral stiffness of the structure: when the tenon is small, the holding force of the tenon is increased because of the change of the section of the top of the column, and the stiffness of the structure is higher than that of the wood frame with the bigger tenon, while when there is a small gap at the end of the tenon, The skeleton curve is close to the skeleton curve of the slotted wood frame at the end of the dovetail tenon. The pseudostatic and dynamic tests of single and double span wooden frame with or without bucket arch are simulated under different counterweights. The hysteretic characteristics of four wood frames under low cycle cyclic loading are analyzed and the skeleton curves are compared. Under the action of El Centro seismic wave, the relative displacement time history curve and acceleration time history curve are obtained at different heights of the structure. The results show that the seismic response of the structure is affected by the weight distribution at the top of the structure: the peak relative displacement of the lower part of the structure increases with the increase of the weight, and the period of the acceleration time history curve increases with the increase of the weight. The relative displacement responses of single and double span wooden frames under El Centro seismic wave loading are compared. The peak displacement of the top of the column relative to the bottom plate of the double-span wooden frame structure without bucket arch is greater than that of the top of the wooden frame without the bucket arch when the average weight of the column is 3 t, but when the average weight of the column increases to 6 and 9, the maximum displacement of the column against the bottom plate is larger than that of the single span wooden frame with no bucket arch. The peak displacement of the column top relative to the bottom plate is smaller than that of the single span column roof without the bucket arch compared with the bottom plate. The peak displacement of double-span wooden frame with bucket arch is higher than that of single-span wooden frame with bucket arch under three-stage counterweight.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU366.2;TU352.11

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