基于风洞试验的高层建筑动力荷载响应相关法研究

发布时间：2018-01-22 03:07

  本文关键词： 高层建筑 风洞试验 等效静力风荷载 动力荷载响应相关法 响应谱法 峰值因子 风荷载组合系数　出处：《中国建筑科学研究院》2016年博士论文　论文类型：学位论文

【摘要】：随着我国经济和工程技术的发展,在新世纪的十多年里高层建筑在我国得到了前所未有的发展。建筑形体、高度的发展以及城市环境的变化使得风荷载成为高层建筑安全性、舒适性的控制性因素之一。高层建筑风效应的研究成为工程设计的必要步骤。本文基于刚性模型同步测压试验,对高层建筑风荷载的计算理论和方法进行了系统研究,建立了较为完整的高层等效静力风荷载计算和简化计算的方法体系。主要工作包括：1)研究了典型高层建筑气动力特征。通过厚宽比1/4～4,高宽比为4-9的10个典型高层建筑的刚性模型同步测压试验,分析研究了层风力、基底弯矩和扭矩的平均值、均方根值和功率谱的特征,并基于大量高层建筑振型及周期统计研究了气动力广义力功率谱及相关性特征,研究表明矩形截面高层建筑第一、二阶横风向广义力相关程度较高,且二者功率谱具有很好的一致性。根据风洞测试数据拟合了气动力均值、均方根值及功率谱计算公式,为后续研究提供数据基础。2)提出了等效静力风荷载计算的动力荷载响应相关法(DLRC)。基于LRC法和等效风振力法的思路,推导了DLRC计算公式,并利用DLRC方法,解决了非主轴方向等效目标以及多等效目标的等效静力风荷载计算问题。通过理论分析和计算表明：与其他计算方法相比,DLRC法适用于三维风荷载的等效且计算精度更高。3)改进了规范顺风向风荷载、横风向风荷载计算方法。基于DLRC法,通过增加二阶背景风荷载的方法改进了规范顺风向风荷载计算方法,解决了规范顺风向风荷载对刚性模型基底剪力计算误差较大的问题；基于数值积分和DLRC法提出了横风向风荷载计算的响应谱法,响应谱法与地震反应谱法类似,在保证横风向荷载精度的同时使横风向风荷载概念更清晰,计算更加简便。4)初步研究了等效静力风荷载的可靠度。基于概率密度的正交分解方法研究了峰值因子的可靠度,并提出了峰值因子计算新方法；基于DLRC法和联合概率密度分布函数提出了三分力风荷载组合系数计算方法,为高层建筑风荷载可靠性研究提供了初步理论基础。
[Abstract]:With the development of economy and engineering technology in our country, high-rise buildings have been developed in our country for more than ten years in the new century. With the development of high altitude and the change of urban environment, wind load becomes the safety of high-rise building. One of the controlling factors of comfort. The study of wind effect of high-rise building becomes a necessary step in engineering design. This paper based on rigid model synchronous pressure test. The theory and method of wind load calculation for high-rise buildings are studied systematically. A complete method system of equivalent static wind load calculation and simplified calculation is established. The main work includes: 1) the aerodynamic characteristics of typical high-rise buildings are studied. The thickness to width ratio of 1 / 4 / 4 is used to study the aerodynamic characteristics of typical high-rise buildings. In this paper, 10 typical high-rise buildings with a aspect ratio of 4-9 are tested by rigid model simultaneously. The characteristics of the average wind force, base bending moment and torque, root mean square value and power spectrum are analyzed. And based on a large number of high-rise building mode and period statistics, the aerodynamic generalized force power spectrum and its correlation characteristics are studied. The results show that the first and second order cross-wind generalized force correlation degree is high. According to the wind tunnel test data, the aerodynamic mean value, root mean square value and power spectrum formula are fitted. The dynamic load response correlation method based on LRC method and equivalent wind force method is proposed to calculate the equivalent static wind load. The formula of DLRC is deduced and the DLRC method is used. The problem of equivalent static wind load in non-spindle direction and multi-equivalent target is solved. The theoretical analysis and calculation show that the method is compared with other methods. The DLRC method is applicable to the equivalent of three-dimensional wind load and has higher accuracy. 3) it improves the calculation method of wind load in the downwind direction and the wind load in the crosswind direction in code. Based on the DLRC method. By adding the second-order background wind load, the calculation method of the normative downwind wind load is improved, which solves the problem that the calculation error of the standard downwind wind load to the rigid model foundation shear force is large. Based on numerical integration and DLRC method, a response spectrum method is proposed to calculate the cross-wind wind load. The response spectrum method is similar to the seismic response spectrum method, which ensures the accuracy of the cross-wind load and makes the concept of cross-wind wind load clearer. The reliability of equivalent static wind load is preliminarily studied. The reliability of peak factor is studied by orthogonal decomposition method based on probability density, and a new method for calculating peak factor is proposed. Based on the DLRC method and the joint probability density distribution function, a method for calculating the combined coefficients of three-point wind loads is proposed, which provides a preliminary theoretical basis for the study of wind load reliability of high-rise buildings.
【学位授予单位】：中国建筑科学研究院
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TU973.213
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本文编号：1453449