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

9416463程这个项目调查了传教士哥特式地下通道和牛溪峡谷海峡大桥的损坏和倒塌行为。对现场受损结构进行了研究，并与加利福尼亚州著名工程师交换了广泛的实地观察。这些工作包括：(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)相互作用地震动的影响；(4)结果综合；(4)桥梁规范改进建议。分析包括非线性有限元的建立和相互作用地震动对结构响应的影响。分析结果将验证现场观察，并加强目前美国桥梁设计和改造的实践。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. ***