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Review Items on Structural Design and Construction for Buildings using Ultra High-Strength Reinforced-Concrete

Abstract


In Recent years, for an application of ultra high-strength reinforced-concrete (New
RC) on super high-rise buildings, the public, including researchers, building developer,
building designer etc, not only have a strong interest but also have paid many efforts on
it. The strengths of the New RC materials exceed range specified in the existing RC
code in Taiwan. Basically, the characteristics of structure made by the New RC
materials are different from that made by traditional RC material in many aspects,
especially on a concept of application. Therefore, for development and wide application
of this type structural system, its structural characteristics shall be clear understood. So
far, use of the New RC materials on super high-rise seismic buildings in Japan has been
very mature. In Japan, the design of buildings using the New RC materials shall be
based on analysis considering elastic-plastic behavior of its members and containing
inelastic dynamic time history responses of the whole structure. According to Taiwan’s
official review system of building structure, a procedure of peer review for a building
structure should be lunched as the height of building exceeds 50 meters. In addition, if a
building structure adopts some materials that exceeded limitations of the related latest
codes, a recognized application for new material and new construction methodology
should be approved by an authorized building administration. For an initiation of
developing New RC buildings in Taiwan, the recognized application gives a basic and
necessary qualification for constructing New RC buildings but it is less help to
positively develop the New RC industry. In fact, it needs more practical experience
accumulations efficiently including material certification, analysis and design methods
of individual members and whole structure, and details and arrangement of construction
than just a recognized application of the new methodology. For helpful developments of
Taiwan’s New RC technologies on buildings, the aim of this report is to establish the
review items that consider Japan’s experiences and Taiwan’s engineering practices. This
establishment of the review items is focused on special parts on analysis, design and
construction of New RC building exception Taiwan’s existing “Commissioned Review
Principles of Special Structure”. The key points of the review items include (1)
mechanical properties of the special materials used, (2) behaviors of structural members
made by the materials, if needed, prequalified experiments may be conducted, (3)
proposing inelastic time-history analysis method in this report to understand the overall
ultimate behavior of a structure, (4) design and analysis of structural members
considering a stress state under the structure reaching a maximum deformation
condition, (5) feasibility estimation of construction. To rapidly and effectively
accumulate engineering experiences on the New RC buildings, single review unit is
recommended in this report at beginning development stage of the New RC building.