Collapse Studies of Mission-Gothic Undercrossing and Bull Creek Canyon Channel Bridges with Nonlinear Finite Elements and Interacting Ground Motion

9416463 Cheng本项目研究MissionGothic下穿桥和Bull-Creek峡谷通道桥梁的损坏和倒塌行为。对现场受损的结构进行了研究，并与加州的著名工程师交换了广泛的现场观察结果。这些任务包括：（1）破坏准则和非线性有限元分析，（2）结构建模和响应分析，（3）相互作用地面运动的影响，（4）结果综合，（4）对桥梁规范改进的建议。 分析包括制定非线性有限元和相互作用的地面运动对结构响应的影响。 分析结果将验证现场观察，并加强目前的做法，在美国的桥梁设计和改造。 这是一个北岭地震项目。 ***

9416463 Cheng This project investigates damage and collapse behavior of MissionGothic Undercrossing and Bull-Creek Canyon Channel bridges. Damaged structures on site were studied and field observations extensively with eminent engineers in California were exchanged. The tasks include: (1) failure criteria and nonlinear finite element analysis, (2) structural modeling and response analysis, (3) effect of interacting ground motions, (4) results synthesis, and (4) recommendations on bridge code improvements. Analysis includes formulation of nonlinear finite elements and the effect of interacting ground motion on structural response. Analytical results will verify field observations and enhance current practice in design and retrofit of bridges in the US. This is a Northridge Earthquake project. ***