![]() ![]() It was found that in the out-of-plane direction, current connection details utilising shallow embedded threaded inserts resulted in brittle joint failure and as such do not meet performance criteria in NZS 3101:2006. Specimens were subjected to out-of-plane, in-plane, and bidirectional actions. The testing program consisted of over thirty singly reinforced concrete panels incorporating both details currently used in practice as well as alternative connection details that have been proposed to improve connection robustness. An experimental program investigating the seismic response of dowel type panel-to-foundation connections was undertaken. Low-rise precast concrete wall buildings represent a significant portion of the New Zealand building stock, but there is limited evidence of the seismic performance of existing connections between panels and other structural elements. This paper aims only to provide an overview of the assessment, analysis, design and construction processes from a Structural Engineering perspective. This extremely ambitious and challenging project, undertaken by Kiwi Property and their consultant and contractor team has served to demonstrate that seismic strengthening of large commercial buildings ‘in- service’ is possible provided owners, designers, contractors, regulators, and tenants are willing to work together. These issues are covered in further detail as part of this paper.ĭesign and construction of strengthening works progressed in parallel from 2012 whilst maintaining a fully tenanted building. CSW’s identified included L5 transfer beams, shear core foundations, non-ductile shear core walls, tower diaphragms, precast cladding panel connections, podium roof load paths and seismic displacements and tower floor related issues associated with 1980s precast flooring detailing. This was considered inconsistent with the building’s ‘Grade A’ office status and posed a risk to the building occupants and the surrounding Wellington CBD. NLTHA and performance based assessment methodology concluded a seismic assessment rating in the range 35-45%NBS which, whilst above an Earthquake Prone threshold, identified a number of critical structural weaknesses (CSW’s). ![]() An Initial Seismic Assessment (ISA) of the Majestic Centre was followed by Detailed Seismic Assessment (DSA, 2011) of the structure using both modal response spectrum (MRSA) and non-linear time-history (NLTHA) analysis methods. Following the Canterbury Earthquakes, the building’s owner, Kiwi Property, commissioned seismic assessments of their property portfolio. The tower has a dual lateral load resisting system a perimeter reinforced concrete moment frame and two central shear cores. Constructed circa 1991, the building comprises a 25 storey tower above a five storey podium. The Majestic Centre is located in central Wellington, New Zealand. #Reinforced concrete design by h j shah pdf vol 2 online codeThis paper constitutes a comparative study of the Indian code (IS456:2000) and European code ( Eurocode 2 EN ).J. Thus, the study of main features commonalities and differences of the various codes of practice is necessary to form a common platform for structural design throughout the world. The diversity of the provision of codes for countries worldwide becomes a problem when engineers have to move from one country to another. The design codes do not give design procedures, but specify the design requirement and constraints that must be satisfied. These conditions leads each country to establish their own criteria for the design of reinforced concrete structures.Design codes are the most important and basic tools for structural designer engineers. Each country has their own geographical, topographical and climatic conditions. A design code a document that establishes the for the design of a structure. The reinforced concrete structures must be designed and constructed according to the provisions of a design code. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |