Abstract Adjacent base-isolated buildings with corridor bridges have a large seismic displacement demand in their isolation layer, and therefore are prone to collision. Moreover, seismic wave incidence angles may have a great impact on their seismic collision response, especially for near-fault ground motions that may exhibit strong directionality dependence. This paper studies the impact of seismic wave incidence angle and near-fault pulse effect on seismic collision potential of adjacent buildings connected by corridor bridges, retrofitted with base isolation. Two adjacent-building systems are established in OpenSees to facilitate analyses. One is a base-isolated (BI) building system adopted as the baseline model, each building of which consists of lead-rubber bearings (LRB) and ordinary-rubber bearings (LNR). The other one is a base-isolation-with-damper (BID) system, where two additional groups of viscous dampers were added to the isolation layers of BI system. The first group of dampers is used to connect the buildings in order to reduce their out-of-phase motion. The second group of dampers is placed at the base of individual buildings to dissipate seismic energy. The effectiveness of using the dampers of the BID results against the BI baselines was compared. A collision potential index D was proposed to quantify the collision potential of the adjacent base-isolated buildings. The research shows that, the seismic wave incidence angle has a great influence on the building collision potential, which does not necessarily be greatest in the maximum pulse direction. Using dampers may not be useful for reducing building deformation demands, but can effectively coordinate the asynchronous movement of adjacent buildings, reducing the potential of seismic collision. Finally, the Pseudo-Spectral Acceleration (PSA) based on the isolation periods of the buildings was shown to correlate well with the index D, which can be used as the pair of seismic Intensity Measure (IM) and Engineering Demand Parameter (EDP) to describe the collision potential between adjacent base-isolated buildings with corridor bridges.

中文翻译：

---

受双向近断层脉冲式地面运动影响的廊桥相邻基础隔震建筑物的地震碰撞潜力

摘要 廊桥相邻隔震建筑物隔震层地震位移需求大，易发生碰撞。此外，地震波入射角可能对其地震碰撞响应产生很大影响，特别是对于可能表现出强烈方向依赖性的近断层地震动。本文研究了地震波入射角和近断层脉冲效应对廊桥连接的相邻建筑物的地震碰撞潜力的影响，并进行了基础隔离。OpenSees 中建立了两个相邻的建筑物系统以方便分析。一种是采用基础隔震（BI）建筑系统作为基线模型，每栋建筑由铅橡胶支座（LRB）和普通橡胶支座（LNR）组成。另一个是带阻尼器的基础隔离 (BID) 系统，其中在 BI 系统的隔离层中添加了两组额外的粘性阻尼器。第一组阻尼器用于连接建筑物以减少它们的异相运动。第二组阻尼器放置在各个建筑物的底部，以消散地震能量。比较了使用 BID 结果的阻尼器与 BI 基线的有​​效性。提出了碰撞可能性指数 D 来量化相邻基础隔离建筑物的碰撞可能性。研究表明，地震波入射角对建筑物碰撞潜力的影响很大，在最大脉冲方向不一定最大。使用阻尼器可能无助于减少建筑变形需求，但可以有效协调相邻建筑物的异步运动，减少地震碰撞的可能性。最后，基于建筑物隔离期的伪谱加速度 (PSA) 与指数 D 有很好的相关性，可用作地震强度测量 (IM) 和工程需求参数 (EDP) 对描述具有走廊桥梁的相邻基础隔离建筑物之间的碰撞可能性。