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PI: Prof. Hongnan Li Dalian University of Technology, China Co-PI : Prof. Satish Nagarajaiah

PI: Prof. Hongnan Li Dalian University of Technology, China Co-PI : Prof. Satish Nagarajaiah. Project: Structural Seismic Process Simulation and Control under Multiple Ground Motions. 2. Project Objective. 3. Project Contents. 4. Research Advances. Outline. 1. Background.

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PI: Prof. Hongnan Li Dalian University of Technology, China Co-PI : Prof. Satish Nagarajaiah

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  1. PI: Prof. Hongnan Li Dalian University of Technology, China Co-PI : Prof. Satish Nagarajaiah Project: Structural Seismic Process Simulation and Control under Multiple Ground Motions

  2. 2. Project Objective 3. Project Contents 4. Research Advances Outline 1. Background

  3. 2. Project Objective 3. Research Plan 4. Research Advances Outline 1. Background

  4. 1. Background: Disasters National Stadium-- "Bird's Nest" National Grand Theater--"Eggshell" Huanqiu Center Jinmao Tower In Shanghai Diwang Building In Shenzhen Oriental Peal TV Tower New CCTV Building National Swimming Center--"Water Cube" Sutong Bridge in Jiangsu A lot of high-rise and large-span structures have been built or are under construction in China in recent years.

  5. These modern structures are flexible and will be subjected to earthquakes, wind excitations and other natural disasters. 1. Background: Disasters Earthquake Flood Mudslide Typhoon

  6. 1. Background: Disasters Wenchuan Great Earthquake (Ms 8.0) Time：14:28, May 12, 2008 Location：Wenchuan County, Sichuan Province in China Dead and Missing People: 87,000

  7. 1. Background: Disasters Yushu Earthquake (Ms 7.1) Time：07:49, April 14, 2010 Location：Yushu County, Qinghai Province in China Dead People: 2698

  8. Damage of Buildings Damage of a Stadium Damage of a Transmission Tower 1. Background: Disasters The typhoon is also a major disaster in China and a lot of structures are damaged due to typhoon every year. Typhoon in 2006 Typhoon in 2007 Typhoon in 2008 Typhoon in 2009 Typhoon in 2010

  9. 1. Background: DECISEW Plan National Natural Science Foundation of China (NSFC) Funding Damage Evolution of Civil Infrastructures under Strong Earthquake and Wind (DECISEW) Plan Focus The process and mechanism of damage evolution of major infrastructures. The property and law of strong earthquake and strong typhoon fields.

  10. 1. Background: DECISEW Plan

  11. 1. Background: DECISEW Plan • The theoretical model of strong earthquake and strong typhoon fields • The damage evolution process and collapse mechanism of major civil structures • The integrated simulation system of damage evolution. Objective International Collaborative Research Project PI of DECISEW Project with PI of NEES of NSF NSFC DECISEW: Damage Evolution of Civil Infrastructure under Strong Earthquake and Wind (China) NEES: Network for Earthquake Engineering Simulation (USA)

  12. 1. Background: DECISEW Plan Prof. Hong-Nan Li, PI of DECISEW Project, “The seismic destroy mechanism and process simulation of structures with multi-dimensional nonlinearities” (90815026), 2009-2012. International Collaborative Research Project (NSFC) Structural Seismic Process Simulation and Control under Multiple Ground Motions Prof. Satish Nagarajaiah, PI of NEES Project, “NEESR-SG: Development of Next Generation Adaptive Seismic Protection Systems” (NSF-CMMI-0830391), 2008-2013. 2013-2017 3 million RMB

  13. 2. Project Objective 3. Research Plan 4. Research Advances Outline 1. Background

  14. 2. Project Objective Objectives Subjects Methods Multi-dimensional Ground Motion Excitations Multi-Ground Motion Theoretical Analysis Nonlinear seismic response of spacial structures Concrete Materials Mechanism of damage and collapse of structures Model Experiment Concrete Members Practical Seismic Design Measures Numerical Simulation Concrete Structures Structural Damage Control Techniques

  15. 2. Project Objective 3. Research Plan 4. Research Advances Outline 1. Background

  16. 3. Research Plan A: Multi-dimensional earthquake excitation model B: Experiments and simulation of the damage process of concrete members C: Collapse process simulation of concrete structures D: Theory and methods for structural disaster damage process control

  17. 3. Research Plan • A-1: Multi-dimensional earthquake excitation model in time domain (body wave and surface wave) • A-2: Relevance of Multi-dimensional earthquake excitations • A-3: Stochastical model of multi-dimensional earthquake excitation • A-4: Experimental verification of torsional components of earthquakes A: Multi-dimensional earthquake excitation model B: Experiments and simulation of the damage process of concrete members C: Collapse process simulation of concrete structures D: Theory and methods for structural disaster damage process control

  18. 3. Research Plan A: Multi-dimensional earthquake excitation model • B-1: Multi-axial damage experiments of concrete members (beams, columns, walls and joints) • B-2: Damage principle and restoring force model of concrete members • B-3: Damage evolution Simulation of concrete members (FEM) B: Experiments and simulation of the damage process of concrete members C: Collapse process simulation of concrete structures D: Theory and methods for structural disaster damage process control

  19. 3. Research Plan A: Multi-dimensional earthquake excitation model B: Experiments and simulation of the damage process of concrete members • C-1: Shaking table test of concrete structures • C-2: Collapse analysis of concrete structures • C-3: Multi-scale analysis of concrete structures • C-4: Seismic Design Measures C: Collapse process simulation of concrete structures D: Theory and methods for structural disaster damage process control

  20. 3. Research Plan A: Multi-dimensional earthquake excitation model B: Experiments and simulation of the damage process of concrete members C: Collapse process simulation of concrete structures • D-1: Shape memory alloy (SMA) dampers • D-2: Semi-active piezoelectric friction damper • D-3: Optimization of dampers • D-4: Active and Semi-active Control theory D: Theories and methods for structural disaster damage process control

  21. 3. Research Plan

  22. 3. Research Plan Dalian University of Technology (DUT), China Except the communication by phone, email or video meeting, seminars will be held between DUT and RU in China or USA. Video conference Phone Email Rice University (RU), USA

  23. 3. Research Plan Seminar on Sept 12,12, DUT • Last December, we had a seminar and discuss our collaboration plan and methodologies at DUT. • This August, we discussed the seismic protection research plan and exchange students and scholars in RU. Seminar on August 5,13, RU Seminar on Sept 12,12, DUT

  24. 2. Project Objective 3. Research Plan 4. Research Advances Outline 1. Background

  25. 4. Research Advances 1. Mathematical model of torsional component of earthquakes Theoretical formulation of torsional motions SHwave incidence P wave incidence SV wave incidence Rayleigh wave incidence Love wave incidence

  26. 4. Research Advances 1. Mathematical model of torsional component of earthquakes Time history of torsional motions by the proposed theory Power Spectrum Time History Rocking component Power Spectrum Time History Torsional component

  27. 4. Research Advances 1. Mathematical model of torsional component of earthquakes Underground explosion to get the torsional ground motion

  28. 4. Research Advances 1. Mathematical model of torsional component of earthquakes Underground explosion to get the torsional ground motion Wave Velocity (m/s) Time history of torsional acceleration Depth (m) Experiment Theory 场地速度剖面 Profile of wave velocity

  29. 4. Research Advances 2. Mathematical model of torsional component of earthquakes Advanced triaxial testing machine

  30. 4. Research Advances 2. Damage process of concrete members Experimentally studied the influence of loading rate on the characteristics of columns (45 columns) Considered parameters: Strength of concrete and steel bar, shear-span ratio, loading rate and loading mode.

  31. 4. Research Advances 2. Damage process of concrete members: results (1) Dynamic load can increase the bearing capacity of concrete members (2) Dynamic load can result in larger degradation of stiffness Stiffness degradation coefficient Static load Dynamic load Cycles

  32. 4. Research Advances 2. Damage process of concrete members The crack numbers of dynamic loading are less than those of static loading when the specimens are damaged with seismic loading rates. Static load Dynamic load

  33. 4. Research Advances 3. Robust Control of Civil Structures Steel columns Uncertainties Nominal System Uncertain System

  34. 4. Research Advances 3. Robust Control of Civil Structures Model analysis and updating to make sure the norm upper limit for the uncertainties

  35. 4. Research Advances

  36. 4. Research Advances 3. Robust Control of Civil Structures

  37. Thanks for your attention! August 8, 2013

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