火灾高温及高温后型钢混凝土粘结滑移性能研究

发布时间：2018-06-03 07:46

本文选题：高温 + 型钢混凝土　；参考：《宁波大学》2013年硕士论文

【摘要】：本文通过对型钢混凝土推出试验的研究，分析了高温及高温后型钢混凝土的粘结强度、平均粘结应力与滑移的相互关系，确定粘结强度与火灾高温温度、高温冷却后曾经经历温度之间的关系，建立了与温度或曾经经历温度相关的粘结强度计算公式和粘结应力-滑移本构关系，为型钢混凝土考虑粘结滑移的抗火性能与火灾后力学性能数值模拟分析提供了条件。首先分析了常温下型钢混凝土粘结滑移试验的相关试验方法和现阶段的成果，确定了采用推出试验来研究分析高温及高温后型钢混凝土粘结滑移性能。再者通过对国内外高温及高温后钢筋混凝土粘结滑移性能的试验方法，同时参考国内外高温及高温后钢筋混凝土粘结滑移性能试验研究中所采用的升温炉，设计了一种新型电加热升温炉，成功的实现了对升温炉的炉内温度长时间保持在某一恒定温度下的要求。试验设计了高温下18个型钢混凝土柱、高温后18个型钢混凝土柱以及3个常温下对比的型钢混凝土柱，主要考察了升温最高温度、最高温度持续时间、型钢埋置长度、型钢保护层厚度四个因素对粘结强度以及粘结滑移本构关系的影响。通过布置在试件加载端的位移计来测量型钢混凝土推出过程的滑移量。为分析高温下及高温后型钢混凝土的粘结滑移机理，对整个试验过程进行了详细的观察和记录。根据试验所测得的数据，从而得到平均粘结应力-滑移曲线。对整个试验过程试件的荷载滑移曲线提取了平均极限粘结强度以及相对应的滑移量和平均残余粘结强度以及相对应的滑移量的特征值来归纳分析粘结应力-滑移的曲线特征。通过分析升温最高温度、最高温度持续时间对平均极限粘结强度、平均残余粘结强度以及它们相对应的滑移值的影响，统计回归得到了这个四个特征值的计算公式，并建立了高温及高温后型钢混凝土的粘结滑移本构关系。
[Abstract]:In this paper, the bond strength, the relationship between average bond stress and slip of SRC at high temperature and after high temperature are analyzed, and the bond strength and fire temperature are determined. The bond strength formula and bond stress-slip constitutive relation related to temperature or temperature have been established. It provides the condition for numerical simulation analysis of fire resistance and mechanical properties of steel reinforced concrete considering bond-slip. This paper first analyzes the relevant test methods and the present results of the bond slip test of SRC at room temperature, and determines that the push-out test is used to study and analyze the bond-slip behavior of SRC at high temperature and after high temperature. Furthermore, through the domestic and foreign high temperature and after high temperature reinforced concrete bond-slip performance test methods, at the same time referring to the domestic and foreign high temperature and high temperature reinforced concrete bond-slip behavior test research used in the heating furnace, A new type of electric heating furnace is designed, which successfully meets the requirement of keeping the temperature in the furnace at a constant temperature for a long time. 18 steel reinforced concrete columns at high temperature, 18 steel reinforced concrete columns after high temperature and 3 steel reinforced concrete columns compared at normal temperature were designed. The maximum temperature, duration of maximum temperature, length of embedded section steel were investigated. The influence of four factors on bond strength and bond-slip constitutive relation. The slip of SRC is measured by means of a displacement meter arranged at the loading end of the specimen. In order to analyze the bond-slip mechanism of SRC at high temperature and after high temperature, the whole test process was observed and recorded in detail. According to the experimental data, the average bond stress-slip curve is obtained. Based on the load-slip curves of the specimens during the whole test process, the characteristic values of the average ultimate bond strength, the corresponding slip amount, the average residual bond strength and the corresponding slip amount were extracted to conclude and analyze the characteristics of the bond stress-slip curve. By analyzing the effects of the maximum temperature and the duration of the maximum temperature on the average ultimate bond strength, the average residual bond strength and their corresponding slip values, the four eigenvalues are calculated by statistical regression. The bond-slip constitutive relation of SRC at high temperature and after high temperature is established.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9

【参考文献】