【摘要】：鋼網格盒式結構作為一種新型結構體系,與傳統(tǒng)結構體系相比,在受力特點、建筑功能及經濟性方面,有著較好的推廣前景。隨著城市建設范圍的擴張,越來越多的建筑極有可能處在近斷層區(qū)域,由于含有速度脈沖效應的近斷層地震動對結構的影響與結構自身周期密切相關,會顯著改變結構的動力響應,而目前針對鋼網格盒式結構抗震性能的研究并沒有考慮到近斷層地震作用對結構的影響,因此,研究此類新型結構體系在近斷層地震作用下的抗震性能就具有重要的現實意義。本文主要進行了以下幾方面的研究工作:(1)對近斷層地震動的基本特征進行了全面詳細的介紹,并結合本文所選取地震記錄,對近斷層脈沖型、近斷層非脈沖型以及一般中遠場地震記錄進行了反應譜對比分析。(2)對鋼網格盒式結構體系的基本原理和力學特點進行了介紹,以多層和高層鋼網格盒式結構為對象,建立結構的有限元分析模型,對鋼網格盒式結構進行了動力特性分析,明確了結構的自振特性。(3)建立了多層和高層鋼網格盒式結構非線性分析模型,利用非線性時程分析法,選擇近斷層脈沖型、近斷層非脈沖型以及一般中遠場地震記錄作為地震動輸入,對鋼網格盒式結構進行了地震反應分析,從結構的位移反應、頂點加速度、基底剪力以及塑性鉸的分布方面考察了結構在不同地震作用下的動力響應。(4)通過對地震反應分析結果進行對比,可以得出:結構在近斷層地震作用下的動力響應要大于一般中遠場地震作用下的動力響應。由于速度脈沖效應對結構的影響與結構自身周期密切相關,因此,多層鋼網格盒式結構在近斷層脈沖型地震作用下的動力響應小于近斷層非脈沖型地震作用下的動力響應,而對于高層鋼網格盒式結構,近斷層脈沖型地震作用下的動力響應顯著大于近斷層非脈沖型地震作用下的動力響應。(5)近斷層脈沖型地震作用會顯著增加高層結構的位移及基底剪力需求,特別是改變高層結構的層間位移沿層高的分布規(guī)律,在對此類型高層鋼網格盒式結構進行抗震設計時,要充分考慮到這一不利因素的存在。
[Abstract]:As a new type of structural system, the steel mesh box structure has a good prospect in the aspects of stress characteristics, building function and economy compared with the traditional structure system. With the expansion of urban construction scope, more and more buildings are likely to be located in the near fault area. The influence of near-fault earthquake with velocity pulse effect on the structure is closely related to the structure cycle. The dynamic response of the structure will be significantly changed, but the seismic behavior of the steel mesh box structure has not been studied in consideration of the effect of near-fault seismic action on the structure. It is of great practical significance to study the seismic behavior of this kind of new structural system under near-fault earthquake. The main work of this paper is as follows: (1) the basic characteristics of near-fault ground motion are introduced in detail, and combined with the seismic records selected in this paper, the near fault pulse type is analyzed. In this paper, the response spectra of nonpulse and general seismic records of near fault and middle and far field are compared and analyzed. (2) the basic principle and mechanical characteristics of steel mesh box structure system are introduced, and the multi-layer and high-rise steel mesh box structure is taken as the object. The finite element analysis model of the structure is established, the dynamic characteristics of the steel mesh box structure are analyzed, and the natural vibration characteristics of the structure are clarified. (3) the nonlinear analysis models of the multi-layer and high-rise steel mesh box structures are established. Using nonlinear time history analysis method, the seismic response of steel grid box structure is analyzed by selecting near fault pulse type, near fault non-pulse type and general middle and far field seismic record as ground motion input, and the displacement response of the structure is analyzed from the view of the displacement response of the structure. The dynamic responses of structures subjected to different earthquakes are investigated in terms of the acceleration of the vertex, the shear force of the base and the distribution of plastic hinges. (4) the results of seismic response analysis are compared. It can be concluded that the dynamic response of the structure under near-fault earthquake is larger than that under the general far-field earthquake. Because the influence of velocity pulse effect on the structure is closely related to the period of the structure itself, the dynamic response of the multi-layer steel mesh box structure under the near-fault impulse earthquake is less than that under the near-fault non-pulse type earthquake. For high-rise steel mesh box structures, The dynamic response of near-fault impulse earthquake is significantly larger than that of near-fault non-pulse earthquake. (5) the displacement of high-rise structure and the demand of base shear force are significantly increased by near-fault impulse earthquake. Especially to change the distribution of interstory displacement along the floor height of high-rise structure, the existence of this unfavorable factor should be fully taken into account in the seismic design of this type of high-rise steel mesh box structure.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU391

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