Biography:

Dr. Hussam Mahmoud has completed his BS. and MS. from the University of Minnesota and his Ph.D. from the University of Illinois at Urbana Champaign. Prior to pursuing his Ph.D. he worked as a researcher scientist at Lehigh University and as manager of the Network for Earthquake Engineering Simulation (NEES) Laboratory at the University of Illinois at Urbana-Champaign. He is the current director of the structural laboratory at Colorado State University. He has published more than 50 papers in reputed journals and has been serving as an editorial board member of other journals.

Abstract:

Performance-based engineering has recently evolved from its basic concept of defining performance objectives to prevent structural collapse, with acceptable high level of damage, to minimizing losses without compromising on performance. However, for further refinement of the concept of performance-based design (PBD) and proper extension of PBD to resilience assessment, advanced fracture and collapse simulations as well as novel assessment frameworks are needed. This need is essential to allow for a paradigm shift in performance where minimum life-cycle cost can be realized and reduction in repair and recovery time after major events can be achieved. In this presentation, advancements in failure and collapse analysis and assessment methods for steel connections and buildings under extreme loads will be highlighted. In addition, newly devised probabilistic frameworks will be presented and utilized with the advanced failure and collapse simulation results for minimizing life-cycle cost as well as maximizing resilience through reducing losses and subsequent repair and functionality recovery time after major hazards. The life-cycle framework, accounting for socio-economic losses, will be demonstrated through multi-hazard assessment of steel buildings under uncorrelated seismic and wind hazards. The repair and functionality recovery framework will be demonstrated through resilience evaluation of a steel hospital following a scenario-based earthquake event while accounting for socio-economic losses as well as interdependency between the hospital and other essential community lifelines

Biography:

Dr. Weiwei LIN is a member of the Department of Civil and Environmental Engineering, Waseda University, holding the associate professorship. He has authored and co-authored over 100 academic papers, proceedings, and technical articles dealing with the problems of the structural mechanics and bridge engineering, especially for the steel structures and steel-concrete composite structures. He has co-authored the book entitled: Bridge Engineering: Classifications, Design Loading, and Analysis Methods published by Elsevier. He is a member of several engineering committees, like ASCE, JSCE, IABSE, IABMAS, and IALCCE etc. He is the recipient of IABMAS YOUNG PRIZE of 2014.

Abstract:

In Japan, a half or even more of the existing bridges with a span exceeding 15 meters were predicted to be over 50 years old in next 10 years. Appropriate repair, strengthening, or replacement work should be performed on aged steel bridge structures to ensure they remain in good condition. A novel strengthening method using rubber-latex mortar, glass fiber reinforced polymer plates, lightweight rapid hardening concrete, and reinforcement bars is proposed for strengthening short-span steel railway bridge superstructures and for improving the seismic performance of aged column structures. To confirm the effectiveness of the strengthening method, static loading test, impact test and field test were performed on test specimens for short-span steel railway bridges, longitudinal-lateral beam connections as well as column structures. Numerical simulations have also been made for both laboratory and field tests. According to the obtained results, the present renovation method can significantly enhance the rigidity and load carrying capacity of short-span steel bridge superstructure, connections, and column structures, resulting in the extension of the residual service life and improvement of seismic performance of such structures

Biography:

Dr. Chen received his PhD in 1992 from Civil Engineering at State University of New York at Buffalo. He is Professor and Abbett Distinguished Chair in Civil Engineering, and Director of the federal-funded INSPIRE University Transportation Center at Missouri University of Science and Technology. He has published more than 150 papers in reputed journals in the field of structural health monitoring, structural control, and multi-hazard assessment and mitigation. He has been serving as an associate editor of the Journal of Civil Structural Health Monitoring, an section editor of Sensor, and an editorial board member of 5 reputed journals.

Abstract:

Traditionally, strain data are difficult, if not impossible, to obtain from steel structures in fire due to their harsh environment and temperature measurements are limited to the locations of thermocouples. This paper presents high temperature measurements using a Brillouin scattering based (distributed) fiber optic sensor and the application of the measured temperatures and material parameters recommended in building codes into the enhanced thermo-mechanical analysis of simply-supported steel beams subjected to combined thermal and loading effects. The distributed temperature sensor captures detailed, non-uniform temperature distributions that are compared locally with thermocouple measurements by less than 5% at 95% confidence level. The simulated strains and deflections are validated using measurements from a second distributed fiber optic (strain) sensor and two linear potentiometers, respectively. The results demonstrate that the temperature-dependent material properties specified in the four investigated building codes lead to strain predictions with less than 13% average error at 95% confidence level, and that the EN1993-1-2 building code provided the best predictions. However, the implicit consideration of creep in the EN1993-1-2 is adequate up to 600°C. More recently, the distributed sensing technology for temperature and strain measurements was applied into small- and large-scale composite floor specimens of a reinforced concrete slab on one or two I-shaped steel beams. The temperature measurements in the reinforced concrete slab were compared with those from limited thermocouples. This paper completes with an experimental investigation on the potential change in neutral axis of the concrete-steel composite section at elevated temperature.

Biography:

M.Manikandan is the Sr. Structural Engineer-1 at Gulf Consult-Kuwait with responsibility for Designing and Construction Consultation of the tall buildings, Colleges, Shopping Complexes, Multi story Car Parks, Hospitals, Bridges and Deep Underground structures by considering the Structural requirements and adequate construct able systems to complete the projects within allocated budget and time schedule.

Prior to joining Gulf Consult-Kuwait, M.Manikandan has worked as Structural Engineer at several companies, including RECAFCO-Kuwait, SAEED HADI ALDOOSARY EST-Saudi Arabia, Where he has completed many Precast Structures and treatment plant including the deep underground structures with heavy equipment. Notable he is in the construction industry since past 15 years and has completed many land mark projects in Kuwait as well in Saudi.

M.Manikandan is received PhD in Risk Management in International Construction Projects as an External Part time researcher with Vels University Chennai-India,the on March- 2017 and He has been received Civil Engineering Degree from Kamraj University Madurai-India on April, 2000 following that he has received MBA in Project Management from Sikkim Manipal University-India in 2012.

His professional interests focus on Construction/Project Management, Structural Management and Risk Management in the construction projects and his current projects include Kuwait International Airport Project ,College of Engineering and Petroleum, College of Science and College of Business for women in the Sabah Al Salim Al Sabah University City, Shadadiya –Kuwait and he has published 50 Papers in International and National Journals and Given many key note speeches about Sky scrapers ,Risk management and constructability’s considerations in the international conferences

Abstract:

The most popular system for supporting long-span roofs is steel truss in commercial buildings, such as warehouses and aircraft hangars. There are numerous advantages of steel trusses, such as lightweight, ease of handling and erection, and geometric flexibility. However, there are some drawbacks, in terms of the material selection during the design time and material availability during construction phase, maintenance cost, and low fire resistance. Hence In this presentation, Precast Prestress and Post -Tensioning Concrete and steel built up box girders would be presented as an alternative to steel trusses for spans up to 40 to 50 m without intermediate supports. The design behavior and constructability perspective by illustrating by the help of CONCISE V 4.47h model. This proposed design is easy to produce, fabricate and erect and has lower construction and maintenance costs than steel trusses. the proposed design. A finite element analysis of the specimen is conducted to investigate stresses at long span precast prestress and post tensioning and steel built up girders. Further, the complicated transportation and erection sequence would be illustrated with practical examples to erect the heavy, long span beams.

Biography:

Cheng Yu is a professor in the Construction Engineering Technology program at the University of North Texas. He completed his Ph.D. in Civil Engineering from the Johns Hopkins University. He is the author of a number of articles on cold-formed steel behavior and design and serves on the AISI Committee on Specification and Framing Standards

Abstract:

Recent researches have proved cold-formed steel shear wall with corrugated steel sheathing a promising lateral force resisting system for buildings in high wind and seismic zones. Extensive experimental investigations, including monotonic and cyclic tests on cold-formed steel shear walls with corrugated steel sheathing, were recently completed at University of North Texas. This paper summarizes recent research results on the new shear wall system including experimental and finite element analysis on shear strength and collapse probability analysis on seismic performance. Recommended shear resistance of the corrugated steel sheathing shear walls under wind load and seismic load was given in tabular form. A closed-form approach for calculating the story drift was developed. A set of seismic performance factors were proposed based on a compressive incremental dynamic analysis on six building archetypes.

Biography:

Dr Behzad Rafezy, PhD, PE is the director of Research and Development Department at SidePlate Systems, Inc. an Innovative Steel Connection Design Company. Dr Rafezy has more than 20 years of combined industrial and academic experience in structural engineering. Prior to SidePlate, Dr Rafezy held the position of visiting professor of Structural Engineering at UCLA, Lecture at Cardiff University, UK and the Associate Professor of Structural Engineering at Sahand University of Technology where he led research at all levels from MSc, through PhD to nationally sponsored research. Dr Rafezy has authored and co-authored over 70 peer-reviewed research papers and multiple patents. As a structural engineer, Dr Rafezy had the privilege of working for more than 15 years as a lead structural designer and consulting engineer on over 100 steel and concrete projects, covering commercial, residential and industrial projects.

Abstract:

An innovative special moment frame connection using the SidePlate moment connection technology was developed and tested at the Powel Laboratories at the University of California, San Diego (UCSD). This connection uses two interconnecting parallel plates that sandwich and connect the beam(s) to the column and features a physical separation, or gap, between the face of the column flange and the end of the beam, as shown in Figure 1. The load is transferred from the beam to the column through a series of connecting plates and angles all of which are welded in the shop and then bolted in the field. The tested connections comprised of Wide-flange, Built-up Box and HSS (Tube) Columns and rolled and built-up wide-flange beams with three different configurations, namely Standard, Narrow and Tuck. The test specimens were loaded in a displacement control mode using hydraulic actuators in accordance with the Chapter K of the AISC 341-16, Seismic Provisions for Structural Steel Buildings. Tested connections exhibited predictable, ductile behavior and met the established AISC’s requirements for special moment frame (SMF) connections with average 50% additional deformation capacity.  

The following techniques were employed and lessons were learned in the development of the connection and the successful conduction of the tests:

 

1.       The panel zone regions are substantially strengthened to force plastic hinging into the beam.

2.       The additional side plate extensions cause the beam to hinge further out from the column face, which acts to effectively dissipate more energy without increasing the beam size.

3.       The configuration requires only welds parallel to the direction of load providing maximum possible ductility in the welds.

4.       Substantial finite element analyses were conducted to optimize weld hold-backs and weld-end profiles to reduce stress concentration at the points of load transfer from the beam to the connection. This results in a balanced and smooth load transfer according to the test results.

5.       Only fillet welds are used in the configuration, ensuring that there is no notch effect in the root of the welds.

6.       Every detail in every part of the connection was thoroughly studied to make sure that there is neither a high triaxial stress state nor notch effects.

Thorough finite element analysis is conducted if there are any changes or new features to the specification/construction of the connection.

Biography:

Lan Lin’s research is in the fields of structural and earthquake engineering and focuses on the improvement of the seismic design and performance of buildings, bridges and infrastructure systems. In addition to her research expertise, she has extensive practical experience in the design of bridges. She is a licensed engineer registered in the province of Ontario, Canada. She has received two teaching excellence award from Concordia University.

 

Abstract:

Since the real records from strong earthquakes are not available for almost all parts of Canada, they are often selected from other countries having similar characteristics of ground motions. For example, for the time-history analysis of structures in western Canada (e.g. Vancouver) records are normally selected from earthquakes in California through PEER (Pacific Earthquake Engineering Research Center) database. However, eastern Canada researchers and practitioners always have difficulties in choosing accelerograms for the seismic analysis. Given this, the objective of this study is to compare the bridge responses based on different types of the spectrum-compatible ground motions and to make a recommendation on the use of the accelerograms for the nonlinear time history analysis of bridges in eastern Canada. For this purpose, two existing reinforced concrete bridges located in Montreal, which is considered as a moderate seismic hazard zone, are selected for the study. The spectrum-compatible accelerograms are generated by four different methods. Based on these methods, four sets of accelerograms compatible with the design spectrum for Montreal are selected for the analysis, namely, Set 1: scaled real accelerograms, Set 2: modified real accelerograms, Set 3: simulated accelerograms, and Set 4: artificial accelerograms. Nonlinear time-history analyses are conducted by subjecting the two bridge models to the three levels of the seismic excitations represented by each set of the accelerograms. The deck displacement, expansion bearing displacement, column curvature ductility, and base shear are used to investigate the effects of the selected sets of the accelerograms on the bridge response. Simulated accelerograms are recommended to conduct a time-history analysis of bridges in eastern Canada.