【作者】 朱平华；

【导师】 蒋沧如；

【作者基本信息】 武汉理工大学 ， 结构工程， 2004， 博士

【摘要】 本文以国家973攻关项目“高性能混凝土的性能研究”为依托，以横向科研课题武汉协和医院外科大楼工程质量监控为背景，对绿色高性能混凝土(GHPC)的性能及其在高层建筑中的应用，钢筋混凝土结构及构件时变与非时变可靠性对随机变量的敏感度进行了较为系统的研究。 本文运用正交试验设计方法与方差分析原理，考察了单位水泥(或胶凝材料)用量，水胶比，粉煤灰掺量，高效减水剂的种类与掺量，粗细骨料的种类与掺量，砂率等因素对绿色高性能混凝土的耐久性，工作性，28d强度，绝热温升的影响，并运用现代价值工程理论，首次提出了绿色高性能混凝土配合比优化设计的三参数准则以及基于绝热温升控制的四功能准则。 本文提出了基础大体积混凝土温度场实际上是土壤温度场与混凝土温度场相互作用温度场的假设，建立了共同作用温度场模型，研究了其显式差分解及Stehfest反演解法，用Matlab编制了计算共同作用温度场的程序，程序计算的结果与现场实测结果相当吻合，表明共同作用温度场的假设是合理的。 为了便于比较各随机变量对可靠指标敏感程度的大小，本文分别对分布参数的敏感度与极限状态方程参数的敏感度定义了无量纲的敏感度指标。利用敏感度指标，分不考虑抗力随时间而变化与考虑抗力随时间而变化两种情况，对钢筋混凝土轴心受压构件，受弯构件，受剪构件，大小偏心受压构件进行了敏感度分析。通过大量的算例，总结出了上述构件可靠性对随机变量的敏感度规律。 弯曲破坏和剪切破坏是钢筋混凝土框架柱在地震作用下常见的破坏形式。本文将柱的破坏看作由弯曲失效与剪切失效模式组成的串联体系，分析剪切破坏先于弯曲破坏发生的概率，即柱“强剪弱弯”的失效概率，并据此分析了柱“强剪弱弯”设计可靠性对随机变量的敏感度。 本文基于钢筋混凝土框架结构的二阶弹塑性分析，给出塑性铰的极限弯矩与极限转角的计算公式，基于截面可靠度研究，充分考虑了结构的塑性性质，截面失效的相关性与塑性铰的转动性能，将PNET法与失效树法有效结合起来，提出了基于弹塑性分析的钢筋混凝土框架结构体系可靠度计算的PFT法，进行了钢筋混凝土框架结构体系可靠度对随机变量的敏感性分析。 最后，在总结本文工作的基础上，提出了本课题尚待深入研究的问题。更多还原

【Abstract】 Based on the National "973" Program, "Research on Green High Performance Concrete", and transverse scientific research item, quality control to surgery building engineering of Wuhan Xiehe hospital, green high performance concrete (GHPC) and application thereof to high-rise buildings, sensitivities of reliabilities with and without time varying of reinforce concrete structure and members to random variables are systemically studied in this paper.The design method for orthogonal experiment and theory for deviation analysis are used to find out all kinds of responsible proportions between factors such as water-binder ratio, cement or cementing material content in per cubic meter of concrete, and contents of water reducer and flyash, and coarse aggregate type, and variety of cement. The permeability, workability, 28d compressive strength and adiabatic temperature change are taken as test indexes. For the first time, on the basis of the theory of valve engineering, three-parameters principle is proposed for design optimization of GHPC. Farther, four-functions principle is proposed for design optimization of GHPC based on adiabatic temperature change control to mass concrete.It is proposed that the temperature field of mass concrete of foundation in high- rise is actually interaction one of soil and concrete. And the model for interaction field is built up and the solutions thereof from explicit difference and Stehfest method are studied. And Matlab program is developed to calculate interaction temperature field. The results shows that the theoretic values by the model are in consistence with test ones very well.The sensitivity indexes without dimension are respectively defined about distributing parameters sensitivity and parameters sensitivity in limit state functions so as to compare the magnitude of sensitivity to reliability index from random variables. In the terms of sensitivity indexes, sensitivities of reliabilities are analyzed for reinforcement concrete (RC) axial-compressive members, flexural members, and shear members, and big and small excursion-compressive members, in which resistances are respectively considered to be varying and to remain constantly with time. And sensitivity rules for these members are summed up due to large numbers of calculating examples.Two familiar destroy formats, bending destroy and shearing destroy, appear to RC frame columns under seism action. The columns destroy is considered as a series system made up of bending failure mode and shearing failure mode in this paper. And the failure probability of the column due to shearing destroy prior to bending destroy, i.e, so-called strong shear weak bending is analyzed. Farther analysis is applied to sensitivity of design reliability for strong shear weak bending column to random variables.Based on section reliability analysis of RC members, a method for computingreliability of RC frames systems has been developed with full consideration of the structural plasticity, rotation performance of plastic hinges, and correlation between failure sections. Banding PNET method and failure tree method together, the method that is named PFT method can be used to analyze sensitivity of RC frames systems to random variables. It is more simple and accurate than other methods available up to date.Some problems about this research worth to be studied afterward are put up in the end of the paper.更多还原