摘要
为研究热腐条件下公路桥梁板式天然橡胶支座剪压性能,设计将一批天然橡胶支座置于恒温鼓风干燥箱中,控制一定的温度与湿度,分别进行20d、40d、60d、80d和100d的处理,模拟我国西北地区高温干燥环境对天然橡胶支座的影响,对处理后的试件进行剪压试验,并对其外观尺寸、极限承载力、极限抗剪强度、水平等效刚度及抗剪弹性模量等指标进行对比分析。试验表明热腐处理时间越长,试件出现局部破坏的现象越明显,变形越大,越容易发生脆性破坏,极限抗剪强度、抗剪弹性模量等指标下降的越快。通过对试验结果的对比分析,运用最小二乘法建立极限抗剪强度及抗剪弹性模量的衰减模型基本符合指数函数规律。
The paper aims to study the shearing performance of plate natural rubber bearings used in roads and bridges in the thermal aging conditions. The specimen were dealt in thermostatic air-blower-driven drying closet for 20, 40, 60, 80 and 100 d and sheared horizontally. The dimensions, ultimate strength, ultimate shearing strength, level equivalent stiffness and shearing elastic modulus were analyzed comparatively. The results show that the longer day the specimen are dealt in thermostatic air-blower-driven drying closet, the more obvious local damage phenomenon, the greater deformation, the more prone to brittle failure, and ultimate shearing strength and shearing elastic modulus are decreased more seriously. Through the comparative analysis of the test results, the attenuation model of ultimate shearing strength and shearing elastic modulus created by the method of least squares basically meets the requirements.
出处
《土木工程学报》
EI
CSCD
北大核心
2014年第S1期153-157,共5页
China Civil Engineering Journal
基金
国家自然科学基金(51078065)
质检公益性行业科研专项项目(201210040)
重庆市自然科学计划项目(CSTC2012jj A30007)
沈阳市科技计划项目(F12-271-4-00)
关键词
天然橡胶支座
热腐处理
极限抗剪强度
抗剪弹性模量
水平等效刚度
衰减模型
natural rubber bearings
thermal aging treatment
ultimate shearing strength
shearing elastic modulus
level equivalent stiffness
attenuation model
