發(fā)布時(shí)間：2018-02-19 19:39

  本文關(guān)鍵詞： 動力效應(yīng) 動力增大系數(shù) 倒塌試驗(yàn) 抗連續(xù)倒塌 RC框架結(jié)構(gòu)　出處：《湖南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：連續(xù)倒塌是一個(gè)動力效應(yīng)過程，由于支撐構(gòu)件失效引起的不平衡重力荷載使結(jié)構(gòu)發(fā)生運(yùn)動而產(chǎn)生動能，該動能需要轉(zhuǎn)化為結(jié)構(gòu)的彈性與非彈性應(yīng)變能，從而減慢結(jié)構(gòu)向下運(yùn)動的速度。因此，要避免結(jié)構(gòu)由動力效應(yīng)導(dǎo)致結(jié)構(gòu)的倒塌，結(jié)構(gòu)必須能夠積聚足夠的能量使之在達(dá)到極限破壞狀態(tài)前停止運(yùn)動，為考慮結(jié)構(gòu)倒塌過程中的動力效應(yīng)，采用等效靜力荷載來考慮動力效應(yīng)是常用的抗連續(xù)倒塌設(shè)計(jì)方法，，對于倒塌過程中的動力增大系數(shù)需要通過試驗(yàn)的手段進(jìn)行驗(yàn)證與研究。 1.本文采用擬靜力試驗(yàn)方法完成了一榀單層平面鋼筋混凝土框架結(jié)構(gòu)和一榀單層空間混凝土框架結(jié)構(gòu)的抗倒塌性能試驗(yàn)。研究了兩榀框架在倒塌過程中的空間效應(yīng)和懸索作用，探討了兩榀框架結(jié)構(gòu)在倒塌過程中的受力機(jī)制轉(zhuǎn)換過程和結(jié)構(gòu)破壞形式，獲得了兩榀框架結(jié)構(gòu)在抵抗荷載作用時(shí)的一些靜力參數(shù)，為下一步考慮動力效應(yīng)的倒塌試驗(yàn)設(shè)計(jì)和數(shù)值模擬提供了數(shù)據(jù)支持。 2.本文采用自制脫鉤裝置對一榀單層平面鋼筋混凝土框架結(jié)構(gòu)進(jìn)行了模擬移除框架中柱的倒塌性能試驗(yàn)，試驗(yàn)?zāi)M了柱的失效過程、時(shí)間以及不同的不平衡荷載工況下結(jié)構(gòu)的動力反應(yīng)與性能�；谠囼�(yàn)結(jié)果研究了框架結(jié)構(gòu)在運(yùn)動過程中處于彈性作用階段、彈塑性作用階段和塑性作用階段時(shí)的動力性能，闡述了中柱失效后結(jié)構(gòu)的整個(gè)倒塌過程，得到了試驗(yàn)框架在動力效應(yīng)下的抗倒塌性能。 3.采用ATENA有限元計(jì)算軟件對本文兩榀試驗(yàn)框架和一個(gè)試驗(yàn)案例進(jìn)行了數(shù)值模擬分析，計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合良好。建立了三榀框架模型對抗連續(xù)性倒塌過程進(jìn)行數(shù)值模擬分析，研究了框架抗倒塌過程中的影響因素，如框架層數(shù)等。 4.通過本文中的動力試驗(yàn)數(shù)據(jù)驗(yàn)證了基于能量平衡原理的抗連續(xù)性倒塌評估方法，并利用基于能量平衡原理的抗連續(xù)性倒塌評估方法對的五榀數(shù)值模擬框架進(jìn)行抗連續(xù)性倒塌評估。
[Abstract]:Continuous collapse is a dynamic process in which kinetic energy is generated by unbalanced gravity load caused by failure of bracing members, which needs to be transformed into elastic and inelastic strain energy of the structure. Therefore, in order to avoid the collapse of the structure caused by dynamic effect, the structure must be able to accumulate enough energy to stop it before it reaches the limit state of failure. In order to consider the dynamic effect during the collapse of a structure, it is a common design method to consider the dynamic effect by using equivalent static load. The dynamic increase coefficient in the collapse process needs to be verified and studied by means of experiments. 1. In this paper, quasi-static test method is used to test the collapse resistance of a single-layer reinforced concrete frame structure and a single-story space concrete frame structure. The spatial effect and cable action of two frames during collapse are studied. In this paper, the mechanical transformation process and failure mode of two frame structures in the process of collapse are discussed, and some static parameters of two frame structures are obtained when they are subjected to loads. It provides data support for the design of collapse test and numerical simulation considering the dynamic effect in the next step. 2. In this paper, a self-made decoupling device is used to simulate the collapse behavior of a single-layer plane reinforced concrete frame structure, and the failure process of the column is simulated. Based on the experimental results, the dynamic behavior of frame structures in elastic, elastic-plastic and plastic stages is studied. The whole collapse process of the structure after the failure of the middle column is described, and the anti-collapse performance of the test frame under the dynamic effect is obtained. 3. Two test frames and one test case are numerically simulated and analyzed by ATENA finite element calculation software. The calculated results are in good agreement with the experimental results. Three frame models are established to deal with the continuous collapse process and the influence factors, such as the number of frame layers, are studied. 4. Through the dynamic test data in this paper, the method of anti-continuity collapse evaluation based on energy balance principle is verified. The anti-continuity collapse assessment method based on energy balance principle is used to evaluate the anti-continuity collapse of five numerical simulation frames.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU375.4;TU311.3

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