模拟酸沉降环境混凝土梁承载性能研究
发布时间：2019-04-25 12:07
【摘要】：酸雨环境下钢筋混凝土梁力学性能的变化规律是揭示整个结构承载力和耐久性的前提和基础。参考我国典型城市酸雨的化学组成,分别配置PH1.5与PH2.5的硫酸、硝酸混合溶液来模拟不同酸度的酸雨;自行设计制作了人工降雨器模拟降雨;浇筑了11根120mm×200mm×1900mm的钢筋混凝土梁。分别采用完全浸泡、干湿交替、人工降雨等加速腐蚀试验方法,对10根钢筋混凝土梁进行加速腐蚀。对不同浓度溶液下经历不同腐蚀时间的钢筋混凝土梁,分别利用超声方法测试了混凝土损伤厚度和抗压强度,利用动力试验方法评价混凝土梁的整体特性,并对梁的抗弯性能进行了抗弯实验研究。得到了不同侵蚀状态混凝土梁混凝土损伤厚度、构件刚度、构件开裂荷载、极限承载等力学性能;对比分析了不同加速腐蚀条件下混凝土梁抗弯性能的退化规律,得到了混凝土强度、构件频率以及抗弯强度与混凝土梁损伤程度之间的定量关系。研究结果表明:人工降雨与干湿交替两种方法对混凝土梁抗弯性能的影响基本相似,较浸泡方法变化得到的混凝土梁抗弯性能的退化性能更为显著。
[Abstract]:The variation of mechanical properties of reinforced concrete beams under acid rain is the premise and foundation for revealing the bearing capacity and durability of the whole structure. According to the chemical composition of acid rain in typical cities of China, sulfuric acid and nitric acid solution of PH1.5 and PH2.5 were used to simulate acid rain with different acidity, and artificial rainers were designed and made to simulate rainfall. Eleven 120mm 脳 200mm 脳 1900mm reinforced concrete beams were cast. The accelerated corrosion tests of 10 reinforced concrete beams were carried out by immersion, dry-wet alternation, artificial rainfall and other accelerated corrosion tests respectively. The damage thickness and compressive strength of reinforced concrete beams with different corrosion time under different concentration of solution were tested by ultrasonic method, and the overall characteristics of concrete beams were evaluated by dynamic test method, and the damage thickness and compressive strength of concrete beams were measured by ultrasonic method. The bending behavior of the beam is studied experimentally. The mechanical properties of concrete beams with different erosion conditions, such as concrete damage thickness, member stiffness, member cracking load and ultimate bearing capacity, are obtained. The degradation rules of flexural behavior of concrete beams under different accelerated corrosion conditions are compared and analyzed. The quantitative relations among the strength of concrete, the frequency of members and the flexural strength and the damage degree of concrete beams are obtained. The results show that the effects of artificial rainfall and dry-wet alternation on flexural properties of concrete beams are basically similar, and the degradation of flexural properties of concrete beams is more obvious than that of immersion methods.
【作者单位】： 大连海事大学道路与桥梁工程研究所;
【基金】：国家自然科学基金项目(50708010,51178069) 教育部新世纪优秀人才项目(NCET-11-0860)
【分类号】：TU317;TU375.1
[Abstract]:The variation of mechanical properties of reinforced concrete beams under acid rain is the premise and foundation for revealing the bearing capacity and durability of the whole structure. According to the chemical composition of acid rain in typical cities of China, sulfuric acid and nitric acid solution of PH1.5 and PH2.5 were used to simulate acid rain with different acidity, and artificial rainers were designed and made to simulate rainfall. Eleven 120mm 脳 200mm 脳 1900mm reinforced concrete beams were cast. The accelerated corrosion tests of 10 reinforced concrete beams were carried out by immersion, dry-wet alternation, artificial rainfall and other accelerated corrosion tests respectively. The damage thickness and compressive strength of reinforced concrete beams with different corrosion time under different concentration of solution were tested by ultrasonic method, and the overall characteristics of concrete beams were evaluated by dynamic test method, and the damage thickness and compressive strength of concrete beams were measured by ultrasonic method. The bending behavior of the beam is studied experimentally. The mechanical properties of concrete beams with different erosion conditions, such as concrete damage thickness, member stiffness, member cracking load and ultimate bearing capacity, are obtained. The degradation rules of flexural behavior of concrete beams under different accelerated corrosion conditions are compared and analyzed. The quantitative relations among the strength of concrete, the frequency of members and the flexural strength and the damage degree of concrete beams are obtained. The results show that the effects of artificial rainfall and dry-wet alternation on flexural properties of concrete beams are basically similar, and the degradation of flexural properties of concrete beams is more obvious than that of immersion methods.
【作者单位】： 大连海事大学道路与桥梁工程研究所;
【基金】：国家自然科学基金项目(50708010,51178069) 教育部新世纪优秀人才项目(NCET-11-0860)
【分类号】：TU317;TU375.1
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