發(fā)布時間：2019-03-13 09:52

【摘要】：為了研究受海洋環(huán)境損傷后的鋼筋混凝土軸壓柱的抗火性能，，確立氯離子侵蝕損傷（裂縫寬度ω）對柱截面溫度場分布及鋼筋力學性能的影響，建立損傷指標和混凝土結構抗火性能退化規(guī)律之間的量化關系，重現(xiàn)海洋環(huán)境火災下混凝土結構的生命反應。本文對3根足尺寸鋼筋混凝土軸壓柱進行了快速氯離子侵蝕試驗，模擬海洋環(huán)境損傷，以縱向受力鋼筋銹蝕產(chǎn)生不同寬度的裂縫為前提，對混凝土柱的火災性能進行試驗研究，為數(shù)值分析提供數(shù)據(jù)支持。通過分析使用損傷和地震損傷后混凝土抗火性能研究的成果，確定本文主要研究內(nèi)容如下： （1）分析國內(nèi)外抗火研究的現(xiàn)狀，系統(tǒng)的闡述了鋼筋和混凝土的高溫力學性能和材料的熱工性能，為數(shù)值計算提供理論依據(jù)； （2）對試件進行快速氯離子侵蝕試驗，模擬試件海洋環(huán)境下的損傷，以縱筋銹脹裂縫寬度為初始損傷指標； （3）通過法拉利定律和鋼筋銹蝕試驗，準確測定鋼筋的銹蝕情況，評估銹蝕鋼筋的力學性能； （4）對氯離子損傷后的鋼筋混凝土柱進行火災試驗研究，探究初始損傷柱子的火災破壞情況和溫度場變化規(guī)律； （5）根據(jù)各試件截面的溫度場，對高溫下和高溫后的混凝土軸壓柱的承載力進行分析，完善既有混凝土結構抗火理論并為火災后結構性能評定與修復加固提供理論基礎。
[Abstract]:In order to study the fire resistance of reinforced concrete axial compression columns damaged by marine environment, the influence of chloride ion erosion damage (crack width 蠅) on the temperature distribution and mechanical properties of reinforced concrete columns was established. The quantitative relationship between damage index and fire resistance degradation law of concrete structure is established to reproduce the life response of concrete structure under marine environment fire. In this paper, three fully sized reinforced concrete columns subjected to axial compression were subjected to rapid chloride ion erosion tests to simulate marine environmental damage. On the premise of longitudinal corrosion of steel bars with different widths of cracks, the fire performance of concrete columns was tested and studied. Provide data support for numerical analysis. The main research contents of this paper are as follows: (1) analyzing the present situation of fire resistance research at home and abroad by analyzing the research results of concrete fire resistance after use of damage and earthquake damage. The mechanical properties of steel bars and concrete at high temperature and the thermal properties of materials are systematically described, which provides a theoretical basis for numerical calculation. (2) the rapid chloride ion erosion test was carried out to simulate the damage of the specimen under the marine environment, and the initial damage index was the width of the longitudinal bar rust expansion crack; (3) through Ferrari's law and steel bar corrosion test, the corrosion of steel bar is determined accurately, and the mechanical properties of corroded steel bar are evaluated. (4) the fire test of RC columns damaged by chloride ion is carried out, and the fire failure and temperature field of the columns are studied. (5) according to the temperature field of each specimen section, the bearing capacity of concrete axial compression column at high temperature and after high temperature is analyzed. Improve the fire resistance theory of existing concrete structures and provide a theoretical basis for post-fire structural performance evaluation and repair and reinforcement.
【學位授予單位】：青島理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV33

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