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Experimental Study on Seismic Behavior of Abnormal Reinforced Concrete Frame Interior Joint with Abrupt Beam and Column Section

Author: YaoXianGui
Tutor: WuTao
School: Chang'an University
Course: Structural Engineering
Keywords: Abnormal frame joint seismic behavior pseudo-static test working mechanism analytical approach crack resistance bearing capacity
CLC: TU398.9
Type: Master's thesis
Year: 2009
Downloads: 57
Quote: 3
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Abstract


Abnormal concrete frame interior joint with abrupt beam and column section (hereinafter called "abnormal joint") is widely appeared in large-scale or large-span structure, to meet the architectural function and special process of industry. The seismic behavior of abnormal joint which is different from that of normal joint needs special study.Based on pseudo-static test of four 1/3-scale model, the paper discussed the possible affection of height of beam and column section, stirrup ratio, axial compression ratio, and strength of concrete in the core. Main conclusions are as following:(1) Abnormal joint experiences first cracking, critical cracking, ultimate and damage states during experiment, while ultimate state is closer to critical cracking state comparing with normal joint, shear capacity in first cracking and critical cracking stage is about 55% and 91% that in ultimate stage, respectively. Shear failure of abnormal joint begins with cracking in the small core determined by small beam and top column, ultimately the big core formed by big beam and lower column damaged.(2) Because of the geometry asymmetry, hysteresis loop of load to displacement of beam-tip shows great dissymmetry. Hysteresis loops of big beams are in a opposite "S" pattern, hysteresis loops of small beams are in a bow pattern.(3) Change of beam and column sections affects the joint seismic behavior distinctly, two "cores" appeared where ratio of height of big beam to that of small beam exceeds 2, one is the small core, the other bellow the bottom of the small beam; Increasing stirrup ratio is advantageous to shear capacity; Heightening axial compression ratio is advantageous to crack resistance capacity; Increasing concrete strength will improve both crack resistance and bearing capacity.(4) Experimental and analytical study indicates that crack resistance capacity depends on small core of abnormal joint, and confining of big core to the small one should be taken into account when calculating bearing capacity of the joint.The paper studied the seismic behavior and working mechanism of abnormal joint through experimental and theoretical analysis. The author put forward a theoretical formula of crack resistance capacity, including an influential factor of column axial force; bearing capacity formula was also put forward including a confining factor.

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