AASHTO Guide Specifications for LRFD Seismic Bridge Design

The AASHTO Guide Specifications for LRFD Seismic Bridge Design is established in accordance with the NCHRP 20-07/Task 193 Task 6 Report. Task 6 contains five (5) Sections corresponding to Tasks 1 to 5 as follows:
SECTION 1 includes a review of the pertinent documents and information that were available.
SECTION 2 presents the justification for the 1000- year return period (which is approximately equivalent to a 7% probability of exceedance in 75 years) as
recommended for the seismic design of highway bridges.
SECTION 3 includes a description of how the “no analysis” zone is expanded and how this expansion is incorporated into the displacement based approach.
SECTION 4 describes the two alternative approaches available for the design of highway bridges with steel superstructures and concludes with a recommendation to use a force based approach for steel superstructures.
SECTION 5 describes the recommended procedure for liquefaction design to be used for highway bridges. This aspect of the design is influenced by the recommended design event and the no analysis zone covered in Tasks 2 and 3, respectively. The recommendations proposed are made taking into account the outcome of these two tasks for Seismic Design
Category D. The following recommendations are documented:
Task 2
1. Adopt the 7% in 75 years design event for development of a design spectrum.
2. Ensure sufficient conservatism (1.5 safety factor) for minimum support length requirement. This conservatism is needed to enable to use the reserve capacity of hinging mechanism of the bridge system. This conservatism shall be embedded in the specifications to address unseating vulnerability. At a minimum it is recommended to embed this safety factor for sites outside of California.
3. Partition Seismic Design Categories (SDC’s) into four categories and proceed with the development of analytical bounds using the 7% in 75 years design event.

BS 5493:1977+A2 Code of practice for Protective coating of iron and steel structures against corrosion

This code classifies recommended methods of protection against corrosion of iron and steel structures exposed to environments commonly encountered. It describes the various methods in detail and gives guidance on how to specify a chosen protective system, how to ensure its correct application, and how it should be maintained. The code does not include specific recommendations for ships, vehicles, offshore platforms, specialized chemical equipment, or cladding materials; nor does it include detailed recommendations for plastics
coatings or cement-mortar linings. For some situations, weathering steel may be an alternative to ordinary structural steel with applied coatings. No detailed recommendations on the use of weathering steels are given in this code and when their use is contemplated, advice should be sought from the steel industry.

Components and Systems: Modular Construction Design, Structure, New Technologies

Construction systems reduced to the smallest possible number of identical elements have long been used by architects to build structures as well as dismantle and change them as quickly, efficiently, and economically as possible. Think of the architecture of the nomads, the Crystal Palace designed by the architect John Paxton for the London World s Fair of 1851, or the modern construction systems of the nineteenth and twentieth centuries in steel, concrete, and wood. Coupled with modern digital planning and production methods, modular precast construction systems that are adaptable for many combinations and capable of being combined with one other will play an increasingly important role in architecture in the future. The volume Components and Systems offers an in-depth and clearly organized presentation of the various types of precast building components from semifinished products to building with components, open and closed systems, and skeleton and panel construction all the way to spatial cell constructions. The systems are accompanied by detailed drawings and color photographs. Discussions of transporting and assembling the various systems round off the topic and make this book an indispensable practical companion.

Advances in Environmental Geotechnics: Proceedings of the International Symposium on Geoenvironmental Engineering in Hangzhou, China, September 8-10, 2009

The International Symposium on Geoenvironmental Engineering (ISGE 2009) was held on September 8-10, 2009 in Hangzhou, China. ISGE 2009 was organized by MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Chinese Institution of Soil Mechanics and Geotechnical Engineering (CISMGE), and Chinese Chapter of International Geosynthetics Society (CCIGS), under the auspices of ISSMGE TC5, sponsored by K. C. Wong Education Foundation, and National Natural Science Foundation of China, as well as Zhejiang University Zeng Guo-Xi Lecture Fund.
Issues associated with Environmental Geotechnics continue to be a major preoccupation for governments, public and private organizations and the general community worldwide. The Chinese Government has been putting great effort on environmental issues including sanitary disposal of solid waste, reuse of industrial wastes, remediation of contaminated land, prevention of groundwater contamination, environmental risk assessment, ecological techniques, etc. China also has much to share on the opportunities, challenges and responsibilities for environmental geotechnics with other countries, especially the developing countries.

AASHTO Construction Handbook for Bridge Temporary works

AASHTO- Guide Specifications for Seismic Isolation Design