大型复杂建筑结构风致效应及等效静力风荷载研究

发布时间：2018-01-16 00:28

本文关键词：大型复杂建筑结构风致效应及等效静力风荷载研究　出处：《浙江大学》2013年博士论文　论文类型：学位论文

【摘要】：以超高层及大跨屋盖为代表的大型复杂建筑结构由于质量轻、柔性大、阻尼小等特点使得风荷载往往成为设计控制荷载。对此类风敏感结构风致响应及等效静力风荷载的精细化研究对解决实际设计问题具有重要意义。为此,本文以多个具有代表性的刚性模型测压风洞试验结果为基础,以复杂体型超高层建筑及大型屋盖结构为主要研究对象,开展了以下几个方面的工作： 1.研究了单体及群体超高层建筑结构三维风荷载效应。其中在复杂体型单体建筑三维风荷载效应方面,引入了扭转向等效力偶的概念用以比较扭转向风荷载与水平分量间的大小关系,明确了此类建筑风荷载扭转效应的重要性；拟合了不规则截面建筑在典型风向角下的层扭矩规格化功率谱曲线,发现其受截面厚宽比等参数的影响明显。在群体建筑干扰效应方面,以一窄长形直线状建筑群为研究对象,着重考察了在典型正交风向角下受扰建筑表面各测点风压及层三维风荷载的量值分布和变化情况,发现群体建筑间的干扰作用主要表现为狭缝效应和遮挡效应。 2.考察了三维时变风荷载作用下具有非规则体型超高层建筑结构风致响应的计算方法及影响因素。引入对数坐标体系下广义荷载谱随频率分布的线性假定,提出了新的广义位移响应共振分量简化计算公式,证明了其相比传统的白噪声假定具有更高的精确性；考察了建筑外型的复杂性及高阶振型的参与等因素对结构不同位置各类风致响应的影响。 3.在建立现有单目标等效静力风荷载作用下结构不同位置等效响应与实际结果间相互关系的基础上,提出了可以保证目标位置三维多目标响应等效的静力风荷载计算方法,并进一步综合考虑了峰值因子的非高斯特性及多目标等效折减效应的影响,使得相应的等效静力风荷载计算结果更为合理可靠。 4.根据POD法基本原理对传统大跨屋盖结构风致响应的频域算法加以优化,提出了先挑选控制模态再进行精确风致响应计算的“二步法”过程。工程算例表明该计算过程不仅具有提取信息简单、精度高、收敛快等特点,还有利于从原理上了解风激励对大跨屋盖结构风致响应的影响过程。 5.针对现有屋盖结构等效静力风荷载受不同节点间的风致响应相关性影响、分布形式极不均匀的特点,提出了针对屋盖结构的多目标等效静力风荷载计算方法。该方法不仅考虑了各目标响应脉动极值的符号选取问题,且静力风荷载量值分布不再受单一节点或局部区域的控制,更趋于均匀、合理。在该组等效静力风荷载作用下,不仅能够保证关键部位等效响应与实际结果高度一致,其它非关键部位响应结果也具有一定的精确性和连续性。
[Abstract]:Large and complex structures in high-rise and large span roof represented as light weight, large flexibility, small damping characteristics of the wind load becomes design control load. Research on refinement of wind-induced response and equivalent static wind load of the wind sensitive structure has important significance to solve the problem with the actual gauge. Therefore, the rigidity model manometric based on the wind tunnel test results of a representative based on complex shape high-rise buildings and large roof structure as the main object of study, carried out the following work:
1. of the monomer and three groups of high-rise building structure. The effect of wind load in the complicated shape of single building three-dimensional wind load effect, the concept of equivalent torsional moments to compare the size of wind load and horizontal torsion relationship between components, clear the importance of the construction of wind load torsion effect; fitting the irregular section construction in typical wind direction of the layer torque specification spectrum curve, the influence of thickness to width ratio of section parameters obviously. In group building interference effect, with a narrow and long linear buildings as the research object, focuses on the study in the typical orthogonal wind angle interfered building surface the measured wind pressure and wind load values of the three-dimensional distribution and changes, found the interference effect of group building mainly for the effect of slit effect and occlusion.
2. the effects of the factors with irregular response computation method of tall building structure and wind-induced effects of three-dimensional time varying wind load. Based on the logarithmic coordinate system of generalized linear load spectrum with frequency distribution, put forward the new generalized displacement response of the resonant component simplified calculation formula, proved its compared to the traditional assumption of white noise with more accuracy; the effects of complex architectural appearance and high modes of participation and other factors on the wind-induced response of structures of different position of various.
The relationship between the 3. basic structure in the establishment of the existing single equivalent static wind loads of different position equivalent response and the actual results, proposed can ensure the target location of three-dimensional multi-target response equivalent static wind load calculation method, and further considering the influence of the equivalent non Gauss characteristic peak value factor and multi objective reduction the effect of the calculation results, the corresponding equivalent static wind load is more reasonable and reliable.
4. according to the basic principle of POD algorithm in frequency domain for the traditional method of large span roof structures of wind-induced response optimization, put forward first pick control mode and then accurately calculate the wind-induced response of the "two step" process. The engineering examples show that the calculation process is not only simple information extraction, high precision, fast convergence characteristics, but also conducive to the understanding of wind the incentive effect on the wind-induced response of long-span roof from the principle.
5. for equivalent static wind loads by the existing roof structure influence the wind-induced response of different nodes, the characteristics of distribution is extremely uneven, is proposed for the calculation of the equivalent static wind load multi-objective roof structure method. This method not only takes into account the target response pulsation extremely the sign of the value selection problem, and the static wind load value the distribution is no longer controlled by a single node or the local area, more uniform, reasonable. In the group of equivalent static wind load, can not only ensure the key parts of the equivalent response is highly consistent with the actual results, other non key parts of response result is also accurate and continuous.

【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU312.1

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