tailieunhanh - Báo cáo nghiên cứu khoa học: "STUDY ON A NEW PRECAST POST - TENSIONED BEAM COLUMN JOINT SYSTEM"

Giới thiệu các tòa nhà bê tông đúc sẵn được gọi là cương cứng chi phí-hiệu quả, kiểm soát tốt chất lượng, và nhanh chóng dễ dàng, trên trang web. | STUDY ON A NEW PRECAST POST - TENSIONED BEAM -COLUMN JOINT SYSTEM Do Tien THINH . Student Dept. of Architecture Yokohama National University Koichi KUSUNOKI Associate Professor Dept. of Architecture Yokohama National University Dr. Eng Akira TASAI Professor Dept. of Architecture Yokohama National University Dr. Eng. 1. Introduction Precast concrete buildings were known as cost-effective well-controlled quality and fast easy erection on site. In Japan up to now the design philosophy for precast concrete buildings is to simulate cast-in-situ concrete structure behavior with strong connection. The common approach is connecting precast element by cast-in situ concrete and topping slab 1 . Recently new design philosophy was developed for precast concrete frame building. In this philosophy the connections are detailed to be weaker than the precast elements and are allocated as location of ductile inelastic deformation. The precast elements are designed to have adequate margin strength over that of the connection and will remain elastic under seismic response. Consequently the precast elements would not need to be detailed for ductility hence resulting in economies. Moreover in many cases ductile connection could be designed to be replaceable at much lower cost than repairing of damage to a ductile reinforced concrete 2 . Pampanin S. et al. 2006 developed and tested a new hybrid system in that unbonded post-tensioned steel was used together with external energy dissipaters and shear bracket. However the test specimens in this experiment just simulated short-span frame and no gravity load was apply to the beam to simulate the actual situation 3 . The objectives of this study is design new type of connection which post-tensioned steel resists the moment induced by seismic and gravity loads and shear bracket resists the shear force induced by the gravity load. The connection should have well performance at design level of loading easy and rapid for erecting and .