本报告第1部分描述了旨在评估隔离/约束系统抗震性能的实验研究，该系统是ASHRAE成员设计的典型系统，支持重型机械设备。ASHRAE型隔离/约束系统由约束水平和垂直方向位移的螺旋弹簧和橡胶缓冲器组成。用作试样的重型HVACtype机械设备为离心式液体冷却器。对安装在四个隔离/约束系统上的试样进行了系统识别和地震振动台试验。试验计划包括系统约束部件设计参数的变化，如间隙尺寸、橡胶垫厚度和硬度，以及静态容量。 在每次试验中，记录了冷却器质量中心和角落处的三轴加速度响应、冷却器的位移响应，以及感应到隔离/约束系统中的动态力。对试验结果进行分析，以确定约束部件啮合引起的响应放大，调查隔离/约束系统的抗震性能对约束部件设计参数变化的敏感性，并将约束部件的静态设计能力与其动态（实际）能力进行比较。本报告中描述的实验研究的第2部分旨在评估地震响应- 轻型机械设备隔离/约束（I/R）系统的性能。在一台空气处理机组上进行了两种不同条件下的地震模拟实验:由六个I/R系统支撑，刚性安装。测试计划包括地震和系统识别测试，并包含不同的输入运动振幅和不同的I/R系统特性。试验结果表明，通过I/R系统的约束部件限制设备位移会导致设备加速度响应的放大。导入I/R系统的动态力远远大于静态方法预测的力。根据试验结果，减小间隙尺寸是改善抗震性能的首要建议- 高地震活动地区I/R系统的性能。增加橡胶减震器的厚度是一种减少I/R系统中产生的动态力的解决方案，但它可能会导致设备的加速度和位移响应更高。不建议降低橡胶缓冲器的硬度，因为这会降低I/R系统的整体抗震性能。试验结果表明，轻型和柔性设备的加速度响应放大率应高于坚固和重型设备。

Part 1 of this report describes experimental research aimed at evaluating the seismic performance of an isolation/restraint system, typical of the systems designed by ASHRAE members, supporting heavy mechanical equipment. The ASHRAE-type isolation/restraint system consisted of coil springs and rubber snubbers constraining the displacement in the horizontal and vertical direction. The heavy HVACtype mechanical equipment used as test specimen was a centrifugal liquid chiller. Systemidentification and seismic shake table tests were conducted on the test specimen mounted on four of the isolation/restraint systems. The test plan included variation of design parameters of the restraint component of the systems, such as gap size, rubber pad thickness and hardness, and static capacity. The tri-axial acceleration response at the center of mass and corners of the chiller, displacement response of the chiller, and the dynamic forces induced into the isolation/restraint systems were recorded in each test. The experimental results were analyzed to determine the response amplification due to the engagement of the restraint components, to investigate the sensitivity of the seismic performance of the isolation/restraint systems to the variations of their restraint component design parameters, and to compare the static design capacity of the restraint components to their dynamic (actual) capacity.Part 2 of the experimental study described in this report is aimed at evaluating the seismic-performance of Isolation/Restraint (I/R) systems for light mechanical equipment. Earthquake-simulator experiments were conducted on an air-handling unit in two different conditions: supported by six I/R systems and rigidly mounted. The test plan included seismic and system-identification tests, and incorporated different input motion amplitudes and different I/R system properties. The test results showed that limiting the displacement of the equipment by the restraint components of the I/R systems resulted in amplification of the equipment acceleration-responses. Dynamic forces induced into the I/R systems were considerably larger than the forces predicted by the static approach. Based on the test results, reducing the gap size is the first recommendation to improve the seismic-performance of I/R systems in areas of high seismicity. Increasing the thickness of rubber snubbers is a solution to reduce the dynamic forces induced into the I/R systems, however it might result in higher acceleration and displacement responses of the equipment. Reducing hardness of rubber snubbers is not recommended as it can degrade the overall seismic performance of the I/R systems. The test results showed that higher amplification of acceleration responses should be expected for light and flexible equipment than for rugged and heavy equipment.