基于热氧老化作用下叠层轮胎隔震垫竖向力学性能时变规律研究

Time-varying law of vertical mechanical behavior of laminated tire isolation pads based on thermal aging

为研究叠层轮胎隔震垫(STP)在老化作用下的竖向力学性能,选取团队前期研究最优几何尺寸为180 mm×240mm×80mm的7层STP,将其置于老化温度100℃条件下进行31h、62h、93h、124h、154h的热空气加速老化试验。将完成加速劣化的STP进行竖向力学性能试验研究,深入分析老化时间对STP的竖向刚度、竖向变形性能、抗压弹性模量、竖向极限强度的时变规律影响,结合试验中STP的变形、脱胶、钢丝网破坏及其裂缝延展等内外部破损行为,综合阐明热氧侵蚀环境作用对STP竖向力学性能的影响规律,分析其在设计使用年限内安全使用情况。试验研究结果表明:STP经老化93h(室温下使用30年)时竖向刚度均达到最大,93h后呈现基本持平的趋势。老化后的STP竖向变形性能均满足规范要求且在建筑结构全寿命周期内STP的竖向力学性能稳定。研究成果以期为新型墙下废旧叠层轮胎隔震结构在高烈度村镇地区的推广应用,提供理论基础。

In order to study the vertical mechanical properties of laminated tire isolation mat(STP)under aging,the team selected the7-layer STP with the optimal geometry of 180 mm×240 mm×80 mm and placed it at an aging temperature of 100℃.The hot air accelerated aging test is carried out under conditions of 31 h,62 h,93 h,124 h,and 154 h.The STP of accelerated degradation will be subjected to vertical mechanical performance test,and the influence of aging time on the vertical stiffness,vertical deformation performance,compressive elastic modulus and vertical ultimate strength of STP will be analyzed in depth.Internal and external damage behaviors such as deformation,degumming,wire mesh failure and crack propagation,the influence of thermal oxygen attack on the vertical mechanical properties of STP is comprehensively clarified,and its safe use within the design life is analyzed.The experimental results show that the vertical stiffness of STP is the highest when it is aged for 93 h(30 years at room temperature),and it is basically flat after 93 h.The vertical deformation properties of STP after aging meet the requirements of the specification and the vertical mechanical properties of STP are stable throughout the life cycle of the building structure.The research results are intended to provide a theoretical basis for the popularization and application of the new type of under-wall waste laminated tire isolation structure in highintensity villages and towns.