老化-荷载下叠层轮胎隔震垫恢复力模型研究  

Restoring force model of scarp tire rubber pads under aging-load coupling

作　　者：张广泰[1,2] 王明阳 张文梅 章金鹏 ZHANG Guang-tai;WANG Ming-yang;ZHANG Wen-mei;ZHANG Jin-peng(School of Architecture and Engineering,Xinjiang University,Urumqi 830047,China;Xinjiang Key Laboratory of Building Structures and Seismic,Urumqi 830047,China)

机构地区：[1]新疆大学建筑工程学院,新疆乌鲁木齐830047 [2]新疆建筑结构与抗震重点实验室,新疆乌鲁木齐830047

出　　处：《振动工程学报》2021年第4期809-818,共10页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51568064);新疆教育厅自然科学重点项目(XJEDU2020I005)。

摘　　要：为研究老化⁃荷载作用下废旧叠层轮胎隔震垫(Scarp Tire Rubber Pads,STP)恢复力模型,对72个尺寸为180 mm×180 mm×69 mm的STP经受0,77,154,231,308 h老化时间、5 MPa荷载作用后进行低周反复加载试验,分析STP的破坏特征、承载力衰减、刚度退化、滞回耗能特性。基于试验结果,得到带有负刚度段的三折线骨架曲线,并结合未老化⁃荷载作用下STP恢复力模型特征参数,得到考虑老化⁃荷载作用下STP骨架曲线特征点计算公式;采用基于滞回耗能的循环退化指数建立了可考虑老化⁃荷载作用下STP试件的捏缩效应、承载力衰减和刚度退化的恢复力模型。研究表明:老化⁃荷载作用对STP在实际老化时间为50 a内的滞回耗能没有损伤,且因STP表层橡胶老化硬化而增加;基于循环退化指数建立的STP恢复力模型,与试验滞回曲线对比,两者基本吻合,在一定程度上验证了该恢复力模型的准确性和适用性。To study the isolation performance of Scarp Tire Rubber Pads(STP)under aging-load coupling,72 STPs with dimen⁃sions of 180 mm×180 mm×69 mm are subjected to aging time of 0,77,154,231 and 308 h and 5 MPa load coupling,then a low cycle repeated loading test is carried out to analyze failure characteristics,bearing capacity attenuation,hysteretic energy loss char⁃acteristics of STP.Based on the experimental results,the three-fold line skeleton curve with negative stiffness segment is obtained and according to the characteristic parameters of the STP restoring force model,the formula for calculating the characteristic points of STP skeleton curve considering aging-load coupling is obtained.Using regression analysis,the cyclic degradation index is ob⁃tained based on hysteretic energy consumption.Through the cyclic degradation index,the STP restoring force model under agingload coupling considering the pinch effect,strength degradation and stiffness degradation effects is established.The study shows that the aging-load coupling effect does not damage the hysteretic energy of STP in the actual aging time of 50 a,while the hysteret⁃ic energy of STP even increases due to aging and hardening of STP surface rubber.The STP resilience model established by intro⁃ducing the cyclic degradation index is in good agreement with the test hysteresis curve,which verifies the applicability of the resil⁃ience model.

关 键 词：废旧叠层轮胎隔震垫 隔震性能 老化⁃荷载作用 循环退化指数 恢复力模型 

分 类 号：TU352.12[建筑科学—结构工程] TU317.2