【摘要】：大跨度超高門式結(jié)構(gòu)為一類特殊的結(jié)構(gòu)形式，是指底部分開的兩個(gè)或多個(gè)塔體在一定高度處通過連體將原來彼此獨(dú)立的單體結(jié)構(gòu)連為一體而組成的結(jié)構(gòu)，既不同于普通的高聳結(jié)構(gòu)，也不同于普通的大跨結(jié)構(gòu)，是高聳結(jié)構(gòu)與大跨度結(jié)構(gòu)的組合體。該類結(jié)構(gòu)受力復(fù)雜，其動(dòng)力特性、破壞形式比普通的高聳結(jié)構(gòu)和大跨度結(jié)構(gòu)復(fù)雜得多。本文以實(shí)際工程為背景，對(duì)大跨度超高門式結(jié)構(gòu)的動(dòng)力特性、抗震設(shè)計(jì)方法、地震作用下的響應(yīng)及行波效應(yīng)對(duì)該類結(jié)構(gòu)的影響進(jìn)行研究。主要內(nèi)容如下： 1、大跨度超高門式結(jié)構(gòu)的動(dòng)力特性及振型研究。采用簡化模型，對(duì)大跨度超高門式結(jié)構(gòu)進(jìn)行理論分析，通過求解結(jié)構(gòu)自由振動(dòng)方程，得出該結(jié)構(gòu)體系的基本振型；分析門式結(jié)構(gòu)的振型參與系數(shù)，總結(jié)該體系與普通單塔結(jié)構(gòu)體系振型參與系數(shù)的不同；總結(jié)大跨度超高門式結(jié)構(gòu)的振型選取原則；對(duì)實(shí)際大跨度超高門式結(jié)構(gòu)進(jìn)行模態(tài)分析及振型分析，，并與理論分析結(jié)果比較。 2、大跨度超高門式結(jié)構(gòu)的地震響應(yīng)分析。對(duì)實(shí)際大跨度超高門式結(jié)構(gòu)的三維模型分別采用振型分解反應(yīng)譜法和彈性時(shí)程分析法進(jìn)行地震響應(yīng)分析，深入研究其在三向地震作用下的受力變形特點(diǎn)。 3、行波效應(yīng)對(duì)大跨度超高門式結(jié)構(gòu)的地震響應(yīng)影響。由于實(shí)際大跨度超高門式結(jié)構(gòu)跨度達(dá)150m，應(yīng)考慮行波效應(yīng)對(duì)結(jié)構(gòu)的影響，對(duì)結(jié)構(gòu)進(jìn)行多遇地震下的多維多點(diǎn)分析。研究表明，多點(diǎn)激勵(lì)與一致激勵(lì)的結(jié)果相比，考慮行波效應(yīng)使大跨度超高門式結(jié)構(gòu)的響應(yīng)發(fā)生很大的改變。因此，在對(duì)地震區(qū)大跨度超高門式結(jié)構(gòu)進(jìn)行設(shè)計(jì)分析時(shí)，需考慮行波效應(yīng)對(duì)結(jié)構(gòu)的影響，對(duì)結(jié)構(gòu)進(jìn)行合理的抗震分析。
[Abstract]:Long-span ultra-high gate structure is a kind of special structural form, which refers to the structure composed of two or more towers separated from each other at a certain height by connecting the original independent single structure at a certain height, which is different from the ordinary high-rise structure and the ordinary long-span structure, and is the combination of the high-rise structure and the long-span structure. The dynamic characteristics and failure forms of this kind of structure are much more complex than those of ordinary high-rise structure and long-span structure. Based on the background of practical engineering, the dynamic characteristics, seismic design method, response under earthquake and the influence of traveling wave effect on this kind of structure are studied in this paper. The main contents are as follows: 1. Study on dynamic characteristics and vibration modes of long-span ultra-high gate structure. The simplified model is used to analyze the long-span ultra-high gate structure theoretically, and the basic vibration mode of the structure system is obtained by solving the free vibration equation of the structure, the mode participation coefficient of the gate structure is analyzed, the difference of the vibration mode participation coefficient between the system and the ordinary single tower structure system is summarized, and the selection principle of the vibration mode of the long-span ultra-high gate structure is summarized. The modal analysis and vibration mode analysis of the actual long-span ultra-high gate structure are carried out, and the results are compared with the theoretical analysis results. 2. Seismic response analysis of long-span ultra-high gate structure. The three-dimensional model of the actual long-span ultra-high gate structure is analyzed by mode decomposition response spectrum method and elastic time history analysis method respectively, and the stress and deformation characteristics of the structure under the action of three-way earthquake are deeply studied. 3. The effect of traveling wave effect on the seismic response of long-span ultra-high gate structure. Since the span of the actual long-span ultra-high gate structure is 150 m, the influence of traveling wave effect on the structure should be considered, and the multi-dimensional and multi-point analysis of the structure under frequent earthquakes should be carried out. The results show that the response of long-span ultra-high gate structure is greatly changed by considering traveling wave effect compared with the result of uniform excitation. Therefore, in the design and analysis of long-span ultra-high gate structure in seismic area, the influence of traveling wave effect on the structure should be considered, and the reasonable seismic analysis of the structure should be carried out.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU311.3

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