本文選題：地震響應(yīng) + 模態(tài)分析��； 參考：《華南理工大學(xué)》2010年碩士論文

【摘要】： 大跨網(wǎng)架結(jié)構(gòu)廣泛用于體育館、機(jī)場等大型公共場所。如何提高該結(jié)構(gòu)的抗震能力是研究的熱點(diǎn)之一。 本文以寧波國際會(huì)展中心(二期)大跨度平板網(wǎng)架結(jié)構(gòu)為例,采用數(shù)值分析方法,研究了多維多點(diǎn)地震作用下,網(wǎng)架結(jié)構(gòu)的動(dòng)力響應(yīng),比較了地震動(dòng)輸入方式對結(jié)構(gòu)地震響應(yīng)的影響。研究了隔震支座設(shè)置方式的優(yōu)化。本文主要完成以下工作: 1、利用有限元軟件ANSYS建立結(jié)構(gòu)的計(jì)算模型,進(jìn)行了結(jié)構(gòu)的靜力分析。選取九種形式的桿件截面和五種網(wǎng)架高度,通過分析位移和應(yīng)力響應(yīng)計(jì)算結(jié)果,發(fā)現(xiàn)通過桿件截面優(yōu)化可以有效地降低網(wǎng)架結(jié)構(gòu)在設(shè)計(jì)荷載作用下的位移,隨著網(wǎng)架結(jié)構(gòu)高度的增大,節(jié)點(diǎn)的位移減小。 2、模態(tài)分析結(jié)果表明隨著結(jié)構(gòu)自振階次的增加,自振頻率將遞增。取三種地震波,對網(wǎng)架結(jié)構(gòu)進(jìn)行一致輸入,研究表明:三向地震作用時(shí)得到的結(jié)構(gòu)響應(yīng)最大。 3、在網(wǎng)架結(jié)構(gòu)的八個(gè)支座處虛擬相同質(zhì)量的大質(zhì)量塊。比較了9度多遇地震和罕遇地震對結(jié)構(gòu)的不同作用效果。不考慮行波效應(yīng)時(shí),采用同一地震加速度時(shí)程,對各質(zhì)量塊輸入慣性力,分析網(wǎng)架結(jié)構(gòu)在各方向地震作用下的位移響應(yīng)等�？紤]行波效應(yīng)時(shí),根據(jù)各支座的間距,選取合理的加速度時(shí)程,分析結(jié)構(gòu)的響應(yīng)。結(jié)果表明:單點(diǎn)一致輸入地震作用所得結(jié)構(gòu)位移小于多點(diǎn)輸入情形,即單點(diǎn)輸入將高估結(jié)構(gòu)的抗震能力。取網(wǎng)架前20階模態(tài),由規(guī)范規(guī)定的地震影響系數(shù)曲線得到加速度反應(yīng)譜,分單點(diǎn)和多點(diǎn)兩種激勵(lì)方式分析網(wǎng)架抗震性能。將加速度時(shí)程轉(zhuǎn)成功率譜密度函數(shù),并將之運(yùn)用于抗震分析。分別對三種地震波進(jìn)行比較,結(jié)果發(fā)現(xiàn)三種地震波所得網(wǎng)架結(jié)構(gòu)(均方根)位移和支座反力相差不大。 4、在原有網(wǎng)架模型的支座處增設(shè)8根鋼筋混凝土柱。分析了鉛芯橡膠隔震支座GZY300的三種分布情形,發(fā)現(xiàn)隔震支座的設(shè)置方式對網(wǎng)架的位移響應(yīng)有較大影響。分別采用上部隔震和下部隔震措施,比較三種地震波作用時(shí)結(jié)構(gòu)的位移。將隔震支座設(shè)在網(wǎng)架支撐柱上部,隔震所得結(jié)構(gòu)響應(yīng)小于下部隔震情形。同時(shí)還分析了普通橡膠隔震支座對網(wǎng)架的位移響應(yīng),并與GZY300支座進(jìn)行比較�？紤]不同截面尺寸支撐柱對結(jié)構(gòu)的軸力時(shí)程的影響,亦證明了采用上部隔震對支撐柱的安全是有利的。
[Abstract]:Long-span truss structure is widely used in gymnasium, airport and other large public places. How to improve the seismic capacity of the structure is one of the hot research topics. In this paper, the dynamic response of the grid structure under the action of multi-dimensional and multi-point earthquakes is studied with the example of the large-span flat space truss structure of Ningbo International Conference and Exhibition Center (second phase), and the numerical analysis method is used to study the dynamic response of the latticed truss structure. The effect of seismic input mode on seismic response of structure is compared. The optimization of isolation support is studied. The main work of this paper is as follows: 1. The finite element software ANSYS is used to establish the calculation model of the structure, and the static analysis of the structure is carried out. Through analyzing the results of displacement and stress response calculation, it is found that the displacement of space truss structure under design load can be effectively reduced by the optimization of the member cross section by selecting nine kinds of member sections and five kinds of grid height. With the increase of the height of the grid structure, the displacement of the node decreases. 2. The modal analysis results show that the natural vibration frequency will increase with the increase of the natural vibration order of the structure. Three kinds of seismic waves are used to input the truss structure uniformly. The results show that the structure response is the largest under the action of triaxial earthquake. A large mass block of the same quality is virtual at the eight supports of the grid structure. The effects of 9 degree frequent earthquakes and rare earthquakes on structures are compared. When the traveling wave effect is not considered, the inertia force is input to each mass block by using the same seismic acceleration time history, and the displacement response of the grid structure under the earthquake action in all directions is analyzed. Considering the traveling wave effect, the response of the structure is analyzed by selecting a reasonable acceleration time history according to the distance between the supports. The results show that the displacement of the structure is smaller than that of the multi-point input, that is, the seismic capacity of the structure will be overestimated by the single point input. Taking the first 20 modes of the grid frame, the acceleration response spectrum is obtained from the seismic influence coefficient curve specified in the code, and the seismic performance of the grid frame is analyzed by two excitation modes: single point and multiple points. The spectral density function of acceleration time history transition success rate is applied to seismic analysis. The results show that the displacement of the grid structure (root mean square) and the reaction force of the support are not different from each other. 4. Add 8 reinforced concrete columns to the support of the original grid model. Three kinds of GZY300 distribution of lead-rubber isolation bearing are analyzed. It is found that the setting mode of the isolation bearing has a great influence on the displacement response of the grid frame. The displacements of the structures subjected to three kinds of seismic waves were compared by means of upper isolation and lower isolation respectively. The isolation support is located at the upper part of the grid bracing column, and the response of the isolated structure is smaller than that of the lower one. At the same time, the displacement response of the ordinary rubber isolation bearing to the grid frame is analyzed and compared with the GZY300 bearing. Considering the influence of supporting columns with different cross-section sizes on the axial force history of the structure, it is also proved that the use of upper seismic isolation is beneficial to the safety of the braced columns.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2010
【分類號(hào)】：TU311.3;TU356

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