高烈度地区超限高层设计中的选波及墙肢拉应力问题研究

发布时间：2018-05-26 16:19

本文选题：超限高层 + 弹性时程分析　；参考：《海南大学》2015年硕士论文

【摘要】：近年来,随着我国经济的发展、建筑审美要求的提高以及业主对于建筑构型的不断追求,超限高层建筑日益增加。由于其特殊性与重要性,超限高层的设计与计算需要满足比现行的一般工程建设标准规范、规程更高的要求。综上原因,超限高层结构的问题也逐渐增多。在高烈度地区,以海口(设防烈度为8度0.30g)为例,对于以超出现行有关技术标准所规定的高度为主要超限内容的超限高层建筑,其设计计算主要问题存在于抗震设计过程中。对比一般高层建筑,在超限高层建筑的抗震计算中的补充计算包括以下几项： (1)弹性时程分析在多遇地震的抗震设计中,超限高层结构还需进行弹性时程分析。传统的多遇地震抗震设计中使用的计算方法为反应谱法,该方法采用《建筑抗震设计规范(GB50011-2010)》[1](以下称《抗规2010》)所规定的设计反应谱,故其只考虑了平均频谱特性与振动强度。而多遇地震作用下的弹性时程分析作为补充计算,通过对输入实测地震波与人工模拟地震波的逐时段积分,可以全面反映地震的持续时间、地震动强度和谱特性。为正确反映地震的持续时间、地震动强度和谱特性,弹性时程分析中输入的实测地震波与人工模拟地震波必须符合《抗震2010》第5.1.2条第三款的规定。 (2)拉应力验算在设防烈度的抗震计算中,超限高层结构中的墙体拉应力需满足一定指标。具体要求为：在中震(设防烈度地震)不屈服设计中,需对拉应力超过1倍混凝土抗拉标准值的墙肢设置型钢承受拉力；同时剪力墙平均拉应力不超过2倍混凝土抗拉强度标准值,在此时的平均拉应力计算中,可以把型钢截面面积通过弹性模量比转化为混凝土截面面积。本文针对以上两项超限高层的补充设计问题进行研究,提出了时程分析中的一种选波方法,并阐述了中震拉应力的计算与处理方法。同时,分别根据海口地区的实际工程项目进行计算分析,对类似工程提供一定参考。
[Abstract]:In recent years, with the development of Chinese economy, the improvement of architectural aesthetic requirements and the continuous pursuit of building configuration by owners, the number of high-rise buildings beyond the limit is increasing day by day. Because of its particularity and importance, the design and calculation of over-limit high-rise buildings need to meet higher requirements than the current general engineering construction standards and regulations. In view of the above reasons, the problem of high-rise structure is also increasing gradually. In the high intensity area, taking Haikou (the fortification intensity is 8 degrees 0.30g) as an example, the main problems of design and calculation of the high-rise buildings which exceed the height specified in the current relevant technical standards as the main overrun content are found in the seismic design process. Compared with the general high-rise building, the supplementary calculation in the seismic calculation of the over-limited high-rise building includes the following items: Elastic time history analysis In the seismic design of frequent earthquakes, elastic time history analysis is needed for over-limit tall structures. The traditional calculation method used in earthquake resistant design is response spectrum method, which adopts the design response spectrum specified in < Code for Seismic Design of buildings GB50011-2010] > [1] (hereinafter referred to as "Anti-seismic gauge 2010"), so it only takes into account the average spectrum characteristics and vibration intensity. As a supplementary calculation, the elastic time history analysis under frequent earthquakes can reflect the duration, earthquake intensity and spectral characteristics of earthquakes by integrating the input measured seismic waves and artificial simulated seismic waves time by time. In order to correctly reflect the duration of the earthquake and the intensity and spectral characteristics of the ground motion, the measured seismic wave and the artificial simulated seismic wave input in the elastic time-history analysis must conform to the provisions of paragraph 3 of Article 5.1.2 of the Seismic response 2010. Check calculation of tensile stress In the seismic calculation of fortification intensity, the wall tensile stress in the over-limit high-rise structure needs to meet certain indexes. The specific requirements are as follows: in the design of moderate earthquake (fortification intensity earthquake) not yielding, the wall limb with tensile stress more than 1 times the tensile standard value of concrete should be subjected to tensile force; At the same time, the average tensile stress of the shear wall is not more than 2 times the standard value of the concrete tensile strength. In the calculation of the average tensile stress at this time, the section area of the section of steel can be transformed into the area of the section of concrete through the elastic modulus ratio. In this paper, a method of wave selection in time-history analysis is put forward, and the calculation and treatment of tensile stress of moderate earthquake are described. At the same time, according to the actual engineering projects in Haikou area, calculation and analysis are carried out to provide some reference for similar projects.
【学位授予单位】：海南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.3

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