本文關(guān)鍵詞： 吊腳框架結(jié)構(gòu) 剛度比 動力特性 抗震性能 抗震設(shè)計　出處：《重慶大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：為了更有效地利用山地資源,同時緩解人口日益增長所帶來的住房壓力,推動社會經(jīng)濟的發(fā)展,吊腳建筑結(jié)構(gòu)作為一種常見的山地建筑結(jié)構(gòu)形式在我國諸多山地城市應(yīng)運而生。5.12汶川大地震中吊腳建筑結(jié)構(gòu)的特殊震害暴露出該類結(jié)構(gòu)的設(shè)計缺陷,加之目前學(xué)術(shù)界和工程界對山地建筑結(jié)構(gòu)的研究成果主要集中于掉層結(jié)構(gòu),但吊腳結(jié)構(gòu)特殊抗震問題研究較少,理論明顯滯后于工程實踐,像普通結(jié)構(gòu)一樣按現(xiàn)行規(guī)范進行結(jié)構(gòu)設(shè)計的吊腳結(jié)構(gòu)是否能夠滿足“三水準”的抗震性能目標也猶未可知。針對以上問題,本論文采用有限元模擬的方法,對吊腳框架結(jié)構(gòu)的抗震性能進行了分析,并提出初步的抗震設(shè)計建議�；谝陨媳尘�,本論文主要完成了以下工作:(1)歸納總結(jié)了目前國內(nèi)外關(guān)于山地建筑結(jié)構(gòu),特別是吊腳結(jié)構(gòu)的研究成果以及5.12汶川地震中吊腳建筑結(jié)構(gòu)的震害特點,并實地調(diào)研了重慶地區(qū)吊腳結(jié)構(gòu)的工程實例。(2)針對吊腳結(jié)構(gòu)先天不規(guī)則性,提出新的抗震設(shè)計控制指標“上下剛度比”(建筑結(jié)構(gòu)接地層以上部分整體側(cè)向剛度和接地層以下吊腳部分整體側(cè)向剛度的比值)和“層剛度比”(建筑結(jié)構(gòu)接地層以上一層整體側(cè)向剛度和接地層以下吊腳部分整體側(cè)向剛度的比值),以探討結(jié)構(gòu)的動力特性。在此基礎(chǔ)上,基于SAP2000和PERFORM 3D軟件,對不同抗震設(shè)防烈度區(qū)、按現(xiàn)行規(guī)范進行彈性截面設(shè)計的吊腳框架結(jié)構(gòu)進行彈性、彈塑性分析,總結(jié)該類結(jié)構(gòu)的受力變形規(guī)律、耗能損傷等,用以評價該類結(jié)構(gòu)在不同抗震設(shè)防烈度區(qū)的抗震性能和適用性,找出結(jié)構(gòu)的抗震薄弱環(huán)節(jié)。(3)完善吊腳框架結(jié)構(gòu)的抗震設(shè)計方法,給出針對于不同抗震設(shè)防烈度區(qū)該類結(jié)構(gòu)特殊問題的設(shè)計建議,深入拓展工程實踐中該類結(jié)構(gòu)的抗震措施設(shè)計。通過以上工作,得出了以下主要結(jié)論:(1)“上下剛度比”和“層剛度比”是將宏觀指標參數(shù)化、更具普適意義的綜合性抗震設(shè)計控制指標,可用其值的相對大小指導(dǎo)結(jié)構(gòu)設(shè)計。(2)按現(xiàn)行規(guī)范進行截面設(shè)計的6度低烈度區(qū)的吊腳框架結(jié)構(gòu)在罕遇地震作用下,結(jié)構(gòu)的位移、側(cè)向剛度、剪力分布等抗震性能良好,能滿足“大震不倒”的抗震性能目標。隨“上下剛度比”和“層剛度比”的增大,結(jié)構(gòu)構(gòu)件損傷程度略有降低。(3)隨著烈度的增大,在7、8度所采用的增大截面法雖然可以保證吊腳短柱(剪跨比≤2的柱)的承載力,但當結(jié)構(gòu)遭遇罕遇地震作用時,會引起薄弱層的轉(zhuǎn)移,特別是以最短吊腳柱為中心,周圍構(gòu)件損傷嚴重,極有可能導(dǎo)致上部樓層整體坍塌,最終無法滿足“大震不倒”的抗震性能目標。(4)基于本論文的計算分析結(jié)果,歸納吊腳框架結(jié)構(gòu)的抗震設(shè)計內(nèi)容。重點提出在高烈度區(qū):吊腳短柱適度加強;吊腳長柱(剪跨比2的柱)設(shè)置橫向拉梁;接地層梁軸力不可忽略;地上一層(薄弱層)放大內(nèi)力計算等抗震設(shè)計建議。本論文的創(chuàng)新點可歸納如下:(1)將宏觀控制指標參數(shù)化,提出更具綜合性和普適性的抗震設(shè)計控制指標“上下剛度比”、“層剛度比”,所推導(dǎo)出的簡化計算公式可以從本質(zhì)上反映出吊腳框架結(jié)構(gòu)的剛度特性。(2)通過研究發(fā)現(xiàn),吊腳框架結(jié)構(gòu)順坡向的接地層梁,越靠近最短吊腳柱,軸力越大。結(jié)構(gòu)設(shè)計時應(yīng)對軸力的影響加以重點考慮,不能忽略。
[Abstract]:In order to make more effective use of mountain resources, at the same time to ease the population brought by the growing pressure of housing, to promote the development of social economy, Diaojiao building structure is a common structure form in many mountain mountain city in China came into being in the Wenchuan earthquake disaster.5.12 special structures exposed hanging foot defects in the design of this kind of structure in addition, the academia and engineering research results of mountain building structure mainly focuses on structures, but at the special structure of seismic problem research, the theory lagged behind the engineering practice, like ordinary structure according to the current standard of the same structure is suspending the design can meet the seismic performance objectives of the three level "is still unknown. To solve the above problems, this paper adopts the method of finite element simulation, the seismic performance of suspending frame structures are analyzed, and A preliminary proposal for seismic design. Based on the above background, this paper mainly completed the following work: (1) summarized at home and abroad on the mountain building structure, especially the damage characteristics of suspended building structure research of suspending structure and 5.12 in the Wenchuan earthquake, and field research of suspending structure in the Chongqing area of engineering examples. (2) for suspending structure congenital irregularity, put forward the new seismic design control index on stiffness ratio (above ground part of the whole building structure lateral stiffness and the ratio of the ground below the suspending part of the whole lateral stiffness) and "layer stiffness ratio" (the ground above a layer of building structure the whole lateral stiffness ratio and the ground below the suspending part of the whole lateral stiffness), to investigate the dynamic characteristics of the structure. On this basis, SAP2000 and PERFORM 3D software based on the different seismic fortification intensity region, Suspending frame structure of elastic elastic section design according to the current specification, elastic-plastic analysis, summarize the structure of the force deformation, damage energy dissipation, is used to evaluate the structure in the seismic performance and the applicability of different seismic fortification intensity region, to find out the structure of the shock (3) to improve the weak links. The seismic design method of suspending frame structure, gives the design suggestions for seismic region of this kind of structure with different seismic fortification special problems, further expand the engineering practice of seismic measures in the design of this kind of structure. Through the above work, drew the following conclusions: (1) the upper and lower stiffness ratio and layer stiffness than "is the macroscopic index parameter, comprehensive seismic design control index has more universal significance, the value of the relative size of available guide structure design. (2) a 6 degree low intensity section according to the current standard suspending frame structure In the case of rare earthquake, the displacement of the structure, the lateral stiffness of shear distribution of good performance, can meet the goal of seismic performance of large earthquake without collapse. With the upper and lower stiffness ratio and stiffness ratio of layer ", structure damage degree decreased slightly (3). With the increase in intensity, the 7,8 of the section enlargement method can guarantee suspending short column (shear span ratio is less than 2 of the column) of the bearing capacity, but when structure suffered severe earthquake, will cause the transfer of the weak layer, especially in the shortest Diaojuezhu as the center, around the damage is serious, is likely to lead to the upper floors collapsed, eventually unable to meet the target of seismic performance earthquake does not fall". (4) the results of this paper based on the induction and seismic design of frame structure. The key of suspending in high intensity area: moderate and suspending short column; suspending (long column shear span ratio The 2 column) set the horizontal pull beam; the ground beam axial force can not be ignored; on the ground floor (Bo Ruoceng) amplification forces calculation seismic design suggestions. The innovation of this paper can be summarized as follows: (1) the macro control parameter, put forward a more comprehensive adaptability and general seismic design the control index of upper and lower stiffness ratio, the ratio of stiffness, simplify the derived calculation formula can reflect the stiffness characteristics of suspending frame structure from nature. (2) through the study found that the suspending frame structure along the slope of the ground beam, the closer the shortest Diaojuezhu, axial force more. Structure design to deal with the impact of axial force to focus, can not be ignored.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU352.11

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