本文關(guān)鍵詞：大跨網(wǎng)格結(jié)構(gòu)倒塌模式與多維隔減震控制研究　出處：《東南大學(xué)》2015年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大跨空間網(wǎng)格結(jié)構(gòu) 能量指標(biāo) 倒塌模式 失效機(jī)理 多維隔減震裝置

【摘要】：自二十世紀(jì)初空間網(wǎng)格結(jié)構(gòu)誕生以來(lái),因其特有的跨越能力大、結(jié)構(gòu)輕盈優(yōu)美等特點(diǎn),已經(jīng)發(fā)展成為大型結(jié)構(gòu)工程中重要的結(jié)構(gòu)形式。然而,此類結(jié)構(gòu)常用于人群密集的公共設(shè)施建設(shè),如火車(chē)站、體育館等,一旦倒塌會(huì)帶來(lái)巨大的生命和財(cái)產(chǎn)損失。由于結(jié)構(gòu)跨度大、桿件數(shù)目繁多,其在遭遇強(qiáng)烈荷載作用時(shí),將發(fā)生嚴(yán)重的非線性力學(xué)行為,給結(jié)構(gòu)設(shè)計(jì)師掌握此類結(jié)構(gòu)的抗震性能及判定結(jié)構(gòu)在特定的荷載作用下是否失效和倒塌帶來(lái)了很大的困難。本文在國(guó)家自然科學(xué)基金重大研究計(jì)劃“多維地震下大跨空間網(wǎng)格結(jié)構(gòu)倒塌模式與隔減震控制研究”等基金的資助下,采用理論推導(dǎo)、數(shù)值計(jì)算和試驗(yàn)驗(yàn)證相結(jié)合的方法,系統(tǒng)研究了考慮下部支承結(jié)構(gòu)與上部網(wǎng)格結(jié)構(gòu)耦合效應(yīng)的大跨空間網(wǎng)格結(jié)構(gòu)的動(dòng)力災(zāi)變響應(yīng)、失效機(jī)理和倒塌破壞模式,給出描述結(jié)構(gòu)失效的特征指標(biāo),研究地震能量在大跨空間網(wǎng)格結(jié)構(gòu)的網(wǎng)格之間的傳遞分配規(guī)律,揭示能量在系統(tǒng)中的傳遞、分布與結(jié)構(gòu)的災(zāi)變響應(yīng)之間的內(nèi)在聯(lián)系。主要研究工作和重要結(jié)論如下：(1)提出了基于能量的大跨網(wǎng)格結(jié)構(gòu)彈塑性穩(wěn)定度指標(biāo)基于能量原理和傳統(tǒng)彈性穩(wěn)定度的概念,推導(dǎo)并提出了大跨網(wǎng)格結(jié)構(gòu)彈塑性穩(wěn)定度指標(biāo),以此作為描述結(jié)構(gòu)失效的特征指標(biāo)。該指標(biāo)可以通過(guò)一次非線性動(dòng)力時(shí)程分析直接判定某特定地震荷載作用下結(jié)構(gòu)是否失效,與傳統(tǒng)的通過(guò)繪制荷載幅值與結(jié)構(gòu)特征響應(yīng)之間的關(guān)系曲線來(lái)判定結(jié)構(gòu)是否失效的增量動(dòng)力分析法相比,計(jì)算量大幅減少。以經(jīng)典的六角星形歌德斯克穹頂網(wǎng)殼為例,驗(yàn)證了所提出的彈塑性穩(wěn)定度指標(biāo)的合理性和正確性,說(shuō)明該指標(biāo)可以作為增量動(dòng)力法的一種輔助判定方法,判定結(jié)構(gòu)是否失效。(2)基于彈塑性穩(wěn)定度指標(biāo)分析的某大跨雙層平板網(wǎng)架結(jié)構(gòu)失效判定以一雙層平板網(wǎng)架結(jié)構(gòu)為研究對(duì)象,用基于能量的彈塑性能量穩(wěn)定度指標(biāo)判定該網(wǎng)架結(jié)構(gòu)是否失效,研究多維地震動(dòng)作用下結(jié)構(gòu)彈塑性穩(wěn)定度指標(biāo)和結(jié)構(gòu)強(qiáng)度指標(biāo)、變形指標(biāo)之間的聯(lián)系規(guī)律,發(fā)現(xiàn)該指標(biāo)與傳統(tǒng)的由結(jié)構(gòu)基于強(qiáng)度和變形判斷結(jié)構(gòu)失穩(wěn)判斷的方法相比,對(duì)結(jié)構(gòu)是否失效的判斷更加直觀,基于能量法的彈塑性能量穩(wěn)定度指標(biāo)能揭示大型網(wǎng)格結(jié)構(gòu)失效的內(nèi)在規(guī)律,且更加安全可靠。(3)地震能量在大跨空間網(wǎng)格結(jié)構(gòu)內(nèi)部的傳遞分配規(guī)律研究通過(guò)雙非線性動(dòng)力時(shí)程分析,研究地震能量在大跨空間網(wǎng)格結(jié)構(gòu)內(nèi)部的傳遞分配規(guī)律,揭示系統(tǒng)中能量傳遞、分布與結(jié)構(gòu)的災(zāi)變響應(yīng)、構(gòu)件內(nèi)力和損傷之間的內(nèi)在聯(lián)系。(4)研究大跨結(jié)構(gòu)多維隔減震裝置的減震效果基于大跨空間網(wǎng)格結(jié)構(gòu)多維隔減震裝置(已獲國(guó)家發(fā)明專利,授權(quán)號(hào)：ZL 200610097219.3)的性能試驗(yàn)與理論研究,建立了安裝多維隔減震裝置的大跨空間網(wǎng)格結(jié)構(gòu)模型和分析方法,進(jìn)行受控大跨空間網(wǎng)格結(jié)構(gòu)在多維地震下的動(dòng)力災(zāi)變分析、損傷過(guò)程和失效機(jī)理研究,分析了多維隔減震裝置對(duì)大跨空間網(wǎng)格結(jié)構(gòu)多維抗震能力的影響,證明了用該裝置對(duì)結(jié)構(gòu)失效、倒塌進(jìn)行控制的合理性和可行性。(5)進(jìn)行安裝與未安裝多維隔減震裝置的大跨網(wǎng)格結(jié)構(gòu)地震模擬振動(dòng)臺(tái)試驗(yàn)對(duì)安裝與未安裝多維隔減震裝置的大跨空間網(wǎng)格結(jié)構(gòu)進(jìn)行振動(dòng)臺(tái)試驗(yàn),考察多條不同激勵(lì)幅值地震波對(duì)大跨空間網(wǎng)格結(jié)構(gòu)動(dòng)力特性和災(zāi)變響應(yīng)的影響,驗(yàn)證裝置對(duì)大跨空間網(wǎng)格結(jié)構(gòu)多維抗震能力的實(shí)際提高程度,驗(yàn)證所提的受控大跨空間網(wǎng)格結(jié)構(gòu)的計(jì)算模型和災(zāi)變響應(yīng)分析方法的合理性。本文的創(chuàng)新點(diǎn)主要體現(xiàn)在：(1)提出了基于能量的彈塑性穩(wěn)定度指標(biāo),以此作為判定結(jié)構(gòu)失效與否的特征指標(biāo)。(2)研究地震能量在雙層平板網(wǎng)架結(jié)構(gòu)內(nèi)部的傳遞分配規(guī)律,揭示能量傳遞、分布與結(jié)構(gòu)的災(zāi)變響應(yīng)、構(gòu)件內(nèi)力和損傷之間的內(nèi)在聯(lián)系。(3)對(duì)安裝與未安裝多維隔減震裝置的大跨空間網(wǎng)格結(jié)構(gòu)分別進(jìn)行振動(dòng)臺(tái)試驗(yàn),明確了裝置的隔震和減震性能,驗(yàn)證了安裝多維隔減震裝置大跨空間網(wǎng)格結(jié)構(gòu)的計(jì)算模型和災(zāi)變響應(yīng)分析方法的準(zhǔn)確性。
[Abstract]:Since early twentieth Century the space grid structure was born, because of its large span, light and graceful structure characteristics, it has become the important structural form of large structures. However, this kind of structure has been widely used in the construction of public facilities such as crowded, train station, gymnasium, once the collapse will bring huge loss of life and property. Due to the structure of large span, the number of its members, in the event of a strong load will occur, the nonlinear mechanical behavior is serious, the seismic performance of this structure and determine whether the loads in the structure under the specific failure and collapse is difficult to grasp the structure designer in this article. The major research plan of the National Natural Science Foundation under multi-dimensional seismic spatial reticulated structures collapse mode and damping control of "fund, by theoretical derivation, numerical calculation Method and test combined, considering the dynamic disaster supporting structure and upper grid structure coupling effect of long-span space grid structure response system to study the failure mechanism and collapse mode, describes the characteristics of structural failure, study the distribution of seismic energy between grid spatial reticulated structures. To reveal the energy transfer in the system, the intrinsic link between the distribution and structure of the disaster response. The main research work and conclusions are as follows: (1) the large span grid structure elastic energy and plastic stability index of energy principle and traditional elastic stability based on the concept based on the derived and large span grid structure. The plastic stability index is put forward, as a characteristic index to describe structural failure. The index can be through a nonlinear dynamic time history analysis directly determine a particular earthquake Under the load of structure failure, and by drawing the relation curve between load response amplitude and structure characteristics of the traditional incremental dynamic structure to determine whether the failure analysis method, reduce the computation. In the classic six star Gedesike dome as an example, verified the rationality and correctness of the proposed elastoplastic stability index, the index can be used as an auxiliary method for determining the incremental dynamic method to determine whether the structure failure. (2) the analysis of elastoplastic stability index of a long-span double-layer plate truss structure with a double failure criterion of plate grid structure as the research object based on energy elastic-plastic energy stability to determine whether the failure index structure based on the structure under the action of elastic-plastic stability index and structural strength index of multidimensional earthquake, contact deformation between the indexes, found The index and the traditional structure by the strength and deformation of the buckling structure judgment based on the judgment of whether the failure of the structure compared to determine a more intuitive, energy method of elastic energy stability index can reveal the inherent law of large failure based on grid structure, and more safe and reliable. (3) the double nonlinear time history through the analysis of the seismic energy in the transfer of the distribution of large span spatial structures within the study of seismic energy distribution in large span spatial structures, reveal the energy transfer system, distribution and structure of the disaster response, the intrinsic link between the internal force and the damage component. (4) the damping effect of long-span structure multidimensional damping device based on large-span space grid structure (multidimensional damping device has won the national invention patent, license number: ZL 200610097219.3) performance test and theory research, set up an With multidimensional damping device of large-span space grid structure model and analysis method, dynamic analysis of disaster controlled long-span structure under multiple earthquake the damage process and failure mechanism, analyzes the influence of multidimensional damping device of long-span space grid structure of multidimensional seismic capacity, proved the failure on the structure the device, the feasibility and rationality of control (5). The collapse of the shaking table test installation is not installed and multidimensional damping device of Long-span Grid Structure shaking table test of the installation is not installed with multidimensional damping device of the long-span structure, effects of a plurality of different excitation amplitude of seismic wave on large span the spatial characteristics and the impact on disaster response of power grid structure, improve the degree of the actual verification device of long-span space grid structure of multidimensional seismic capacity, controlled verification of the proposed large span space The calculation model and catastrophe between grid structure response rationality analysis method. The innovation of this paper is mainly reflected in: (1) the energy elastic-plastic stability index based on the determination of the structure as a failure characteristic index. (2) study the distribution of seismic energy in the internal double flat grid structure and reveal the energy transfer, distribution and structure of disaster response, the intrinsic link between internal force and damage components. (3) the installation is not installed with multidimensional damping device of the long-span structure were shaking table test, clear the device isolation and damping performance of the model is verified and the catastrophic space grid structure install the multidimensional damping device of large span in response to the accuracy of the analysis method.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU399;TU352.1

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