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钢筋混凝土结构二阶效应及设计方法的研究 【作者】刘毅 【导师】白绍良

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jr] G6w#P0作者刘毅导师白绍良
? Q:]7I G]Z0【作者基本信息】重庆大学,结构工程,2007年,博士

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&~t,SjuEj0【中文摘要】 钢筋混凝土建筑结构考虑二阶效应的理论认识对工程设计具有重要的指导意义。虽然各国学术界近年来在二阶效应理论研究方面已取得诸多关键性进展,但针对钢筋混凝土结构的特点,在这一领域仍有一系列重要问题有待澄清,以便进一步改进目前从理论上尚不完全确切的设计概念和经验性过强的设计方法。本论文在我国国家设计标准《混凝土结构设计规范》本轮修订需要的推动下,对这一领域若干有待解决的问题进行了分析和试验研究,取得了以下有一定学术进展和创新性的研究成果:(1)根据国内外对框架结构中的P -δ效应规律至今仍缺乏深入研究的现状,利用解析法和数值法对P -δ效应附加变形及附加内力的规律,特别是P -δ效应对柱端弯矩的影响规律以及附加弯矩零点之间距离的变化规律作了较全面、深入的研究,彻底改变了以往以两端铰支不等偏心矩柱的P -δ效应规律充当框架柱P -δ效应规律的不应再容许的状况,从而还给框架结构P -δ效应规律一个真实的理论原形。在此基础上还为新一轮修订的我国《混凝土结构设计规范》提出了到目前为止仍为缺口的考虑p -δ效应的C mη- l0设计建议方法。(2)在各国设计规范中首次为有侧移框架考虑P ??效应影响的...更多ηs - l0法在使用ηs的曲率表达式的前提下提出了能考虑层效应特征和引起结构侧移弯矩作用下的非弹性曲率增量特征的概念准确且又简便易行新一代ηs - l0法建议方案,经对比分析表明,它的精确性已达到考虑二阶效应的弹性结构分析法的同等精度。(3)通过结构二阶分析,对以高层建筑常用的剪力墙结构、框架-剪力墙结构、框架-核心筒结构以及内筒-外框筒结构归纳出的模型结构的P-Δ效应规律作了较详细的考察,首次从理论上对各类模型结构的P-Δ效应、内力及变形变化规律作了解释,获得了一些至今在已查询到的国内外研究成果中尚未见报导的分析研究成果。揭示了我国设计规程这些结构中目前使用的整体增大系数法存在的不足,并提出了重要改进建议。同时对在这些高层建筑结构的框架部分中能否使用ηs - l0法或层增大系数法做出了判断。(4)通过对有吊车工业厂房变阶柱平面排架荷载工况细致分析和控制工况下排架的二阶分析,揭示了这类排架柱中二阶效应的真实变化规律和我国设计规范沿用多年的前苏联排架柱等效长度取值存在的严重不足,给出了理论解释和排架柱等效长度取值的合理建议。指出了国内结构力学界在建筑结构稳定分析中广泛应用的通过初参数法和其它整体稳定分析方法确定结构压杆等效长度的做法存在的概念性失误,并给出了纠正了上述概念失误的初参数法。(5)采用构件折减刚度考虑二阶效应的弹性有限元法是新纳入中国《混凝土结构设计规范》较先进的结构分析设计方法,该方法的准确程度主要依赖构件折减刚度取值的合理性。鉴于该规范尚缺乏确定排架柱相应折减刚度的分析研究成果,本文以单跨工业厂房变阶排架柱为研究对象,通过对一系列典型排架结构算例进行最不利荷载条件下的非弹性有限元全过程模拟,并以采用折减刚度的弹性二阶分析所得柱顶侧向位移与非弹性有限元模拟的柱顶位移等效为条件,选定了适用于排架柱的刚度折减系数后,再以所选刚度折减系数完成的弹性二阶分析所求得的各控制截面内力与非弹性有限元模拟结果的相符性证实了初选排架柱刚度折减系数的合理性。  还原水利论文o*_3O3~@tb$U\'G

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【英文摘要】 The theoretic recognition of second-order effects in RC structures has important guidance for structural design. Although many achievements have been made recently in the research on second-order effects at home and abroad, there remains a series of important problems needed to be clarified, in order to improve the design methods which are now ambiguous in conception and rely heavily on empirical experience. The research in this paper was driven by the revision of China Standard“Code for Design of Concrete Structure”. From the analytical and testing results, this paper made some academic progress as follows.(1)Due to the inadequate researches on the regular pattern of P -δeffect in frame at home and aboard, the rule of additional deform, additional force, the moment at the end of column and the distance of where additional moment equal zero have been studied thoroughly according to analytical and numerical method. The situation that the rule of P -δeffect in eccentrically hinged column...更多 was used instead of the rule in frame column had been changed, thus giving back the theoretical archetype to the rule of P -δeffect in frame. A suggestion of C mη? l0 method considering P -δeffect was proposed for the revision of China National Standard“Code for Design of Concrete Structures”.(2)A simple, convenient and improvedηs - l0 method which employs curvature expression was proposed. In the method P-Δstory effect in sway frame and nonlinear curvature increment caused by sway moment were considered. Careful comparison show the accuracy of this method is as same as the elastic second analysis with stiffness reduction.(3)According to the second-order analysis, the rule of P-Δeffect in shear wall, frame-shear wall, frame-tube and tube-in-tube had been investigated at large. Based on theoretical analyses, the rule of P-Δeffect, internal force and deform in these structures were explained for the first time. The disadvantage of the integrity magnifying method that is employed in China National Code was pointed out, and an improved suggestion was proposed. Finally a judgment whetherη? l0method and floor magnifying factor method could be employed in the frame part of these tall building structures had been made.(4)According to the detailed examination on loading cases in variable bent-column and second-order analysis in design loading case, the regular pattern of second order effect in bent column was reviewed. The disadvantage of effective length in China Code which adopted the Soviet Union Code was pointed out, and a reasonable effective length was proposed. The inaccuracy in compression-bar stability analysis though initial-parameter method was found, and an improved initial-parameter method was proposed.(5)The simplified structural analysis and design method employing stiffness reduction of members, has been accepted by Chinese Standard, in which second-order effects have already been considered through elastic finite element analysis,and its accuracy mostly depends on the rationality of the stiffness reduction factor. In view of the absence of investigation in the stiffness reduction factor of bent frame, according to the non-linear finite element analyses of several single-story single-span bent frames, the stiffness reduction factor of bent-columns was suggested. And the rationality of this factor had been proved by comparison of the internal force in bent-columns and displacement of bent frames in second-order elasticity analysis and non-linear finite element analysis.  还原

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【中文关键词】 钢筋混凝土; η-l0法; 整体增大系数法; 弹性二阶分析法水利论文 zCiF g&?
【英文关键词】 Reinforced concrete; η-l0 method; integrity magnification method; elastic second-order analysis method水利论文:T\!a"J4JPT%i

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TAG: 导师 二阶 刘毅 效应 白绍良
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