The Scheme and Its Management of Autonomous Public Authority in Realizing Innovations onto Expressway Bridges

The scheme of executing a mega project of concrete bridge construction for expressway in Japan is reviewed. The autonomous public authority, JH, Japan Highway Public Corporation provided that scheme in which engineers of concerned sectors, i.e., autonomous public authority, industry and university, resonated in productive and progressive mode. The scientific principles put to practice innovatively are; the external prestressing, the replacement of girder webs by the corrugated steel webs, and above all, hybrid of extradosed prestressing and corrugated steel webs (e.g., Himi Yume bridge, JH, in Nagasaki). The construction methods have been invented in which construction procedure shifted from segmental to “fragmental” construction in which the size of structural elements were made smaller so that construction procedures adapt to diversified environment and resources, i.e., natural, industrial and human resources of the area where construction takes place. “Death valley” which is said to exist between technology innovation and its realization onto products has been bridged over by the scheme fit to verify the quality. The internal dissemination of information and transparency by inviting external criticisms for evaluation of the new ideas exceeding the state of the arts are two functions that supported engineering ethics of the in-house engineers. The innovative ideas and the manners of their applications to practices are eventually transferred to and assisted the bridge projects of autonomous local governments which are constantly in short in fund and man power of in-house engineers in recent advocate of “small government” (e.g., Seiun-Bridge, Tokushima prefecture). Concrete bridges built in the last decade became shared heritage, physically, scientifically and methodically. Intelligent resources still exist but not the scheme since 2005 after dissolution of JH as autonomous entity. Whether or not the human resources be orchestrated in future again awaits ingenuity of next generation and experts of concerned trades.conference pape

Bridges Structural Health Monitoring and Deterioration Detection Synthesis of Knowledge and Technology

INE/AUTC 10.0

Proceedings of IWAMISSE 2018 the International Workshop on Advanced Materials and Innovative Systems in Structural Engineering: Seismic Practices

The International Workshop on Advanced Materials and Innovative Systems in Structural Engineering: Seismic Practices, IWAMISSE 2018, is co-organised by The International Federation for Structural Concrete Turkey Branch, fib-Turkey, and Istanbul Technical University, ITU, on November 16, 2018 at ITU. The International Federation for Structural Concrete, fib, is a not-for-profit association formed by 45 national member groups and approximately 1000 corporate and individual members. The fib’s mission is to develop at an international level the study of scientific and practical matters capable of advancing the technical, economic, aesthetic and environmental performance of concrete construction. Istanbul Technical University (ITU) was established in 1773 and is a state university which defined and continues to update methods of engineering and architecture in Turkey. It provides its students with innovative educational facilities while retaining traditional values, as well as using its strong international contacts to mould young, talented individuals who can compete not only within their country borders but also in the global arena. With its educational facilities, social life and strong institutional contacts, ITU has always been preferred by Turkey’s most distinguished students since its foundation and has achieved justified respect. The workshop covers the topics of advanced materials and innovative systems in structural engineering with a focus on seismic practices as well as other issues related with steel fiber reinforced concrete, anchors/fasteners, precast structures, and recent advances on different types of structural systems such as reinforced concrete, steel, and reinforced masonry structures. This proceeding book contain sixteen papers from ten countries worldwide. We have no doubt that the up-to-date subjects covered during the workshop will be extremely beneficial for the workshop participants both from academia and industry. We would like to thank all authors for their contributions to the workshop as well as the members of the International Scientific Committee for their rigorous work for reviewing the papers. We also gratefully acknowledge the support of the sponsoring companies and we express our sincere thanks to organization committee for their tireless efforts in the overall organization of the workshop. Many thanks go as well to undergraduate and graduate students from ITU for their assistance during all stages of the workshop

Modifikasi Desain Struktur Jembatan Tol Pasuruan – Probolinggo STA 29+325 dengan Struktur Cable-Stayed Bentang 144 Meter

Dalam tugas akhir ini akan direncanakan struktur jembatan menggunakan struktur cable-stayed di Tol Pasuruan-Probolinggo Sta. 29+325 dengan bentang 144 meter. Konfigurasi kabel jembatan menggunakan fan pattern dengan posisi kabel double plane. Jembatan memiliki lebar lantai kendaraan 20,5 m. Adapun hasil dari perencanaan ini adalah bangunan atas dan bangunan bawah. Dalam pembahasan ini lantai kendaraan didesain berupa pelat beton dengan steeldeck, sedang gelagar menggunakan balok komposit dan box baja non komposit. Kemudian stay cable tersusun atas 7-wire strand berdiameter 15,2 mm. Sedangkan pylon didesain dengan menggunakan beton bertulang. Untuk permodelan struktur utama menggunakan analisa dengan pembebanan statis dan dinamis, selanjutnya analisa metode pelaksanaan menggunakan metode demolishing procedure melalui backward solution dengan program bantu MIDAS Civil. Jembatan juga dianalisa stabilitas aerodinamis yang meliputi control terhadap frekuensi alami, efek flutter, dan vortex-shedding. ============================================================================================================= In this final project will be planned bridge structure using cable-stayed structure at toll Pasuruan-Probolinggo Sta. 29+325 with span of 144 meters. Bridge cable configuration using fan pattern with double plane cable position. The deck of bridge has width of 20,5m. The result of this final project are upper and lower structure.in this design, the deck of bridge consist of concrete slab with steeldeck, the girder was using composite and non- composite steel box. Then stay cable is made up of 7-wire strand with diameter of 15.2 mm. while the pylon designed using reinforced concrete material. For the main structure using analysis with static and dynamic load. Staging analysis was using demolishing procedure method through backward solution using MIDAS Civil program. Then, the bridge also analyzed aerodynamic stability which include control of natural frequency, flutter effect, and also vortex shedding effect

Assessment of the Bill Emerson Memorial Cable-Stayed Bridge based on Seismic Instrumentation Data

In this study, both ambient and earthquake data measured from the Bill Emerson Memorial Cable-stayed Bridge are reported and analyzed. Based on the seismic instrumentation data, the vibration characteristics of the bridge are investigated and used to validate a three-dimensional Finite Element (3-D FE) model of the bridge structure. The 3-D model is rigorous and comprehensive, representing realistic dynamic behaviors of the bridge. It takes into account the geometric nonlinear properties caused by cable sagging and soil-foundation-structure interaction in the Illinois approach of the bridge. The FE model is successfully verified and validated by using the natural frequencies and mode shapes of the bridge extracted from the measured data. With the calibrated model, time history analyses were performed to assess the condition of the bridge structure under a postulated design earthquake. Since the FE model is developed according to as-built drawings, the calibrated model can be used as a benchmark for safety evaluation and health monitoring of the cable-stayed bridge in the future

Assessment of the effectiveness of cabling system configuration in retrofitting steel-concrete composite buildings

Steel cables have been extensively used in structural design. Even though their most prominent use is in the design of large span cable stayed or prestressed bridges, a variety of applications in buildings has also been realized. In structural design, cables are mainly used as components of (a) prestressed concrete or post-tensioned steel beams, in order to increase their resistance in bending moment, (b) self-centering systems as a means to restore the connected element to its initial position, or (c) bracing systems as an alternative to the typical steel sections. In the past decade, the use of cables has been proposed as a means of creating ties within a structure, in order to increase its collapse resistance. The mechanical behavior of steel cables and its numerical modeling has been extensively investigated experimentally and numerically [1-16]. However, a concise numerical investigation of their effectiveness in retrofitting steel-concrete composite buildings using three-dimensional models has not been performed. In this work, various cable system configurations are assessed with respect to their effectiveness in retrofitting steel-concrete composite buildings. The selected buildings have been found to be deficient regarding their progressive collapse resistance. Cables are installed (a) in various bays of the building, (b) parallel to its structural elements and (c) under the composite slab in order to improve their performance. The effect of post-tensioning on the efficiency of the steel cables is also evaluated. The results yielded illustrate the effectiveness of each configuration

Assessment of the Bill Emerson Memorial Bridge

Report-Fina