Analysis on several issues of cylindrical suspended structures
Taking the new Heze Museum project as the background,a comprehensive investigation of the cylindrical suspension structure system was studied from eight aspects such as calculation methods,member forces and design,overall yielding mechanism,among others.The results show:1)Adjusting floor mass is unnecessary when calculating horizontal seismic actions for cylindrical suspension structures.2)The bottom axial force method and modal decomposition response spectrum method specified in codes are not suitable for calculating vertical seismic actions for cylindrical suspension structures.Even after adjusting for minimum limit values,the design of hanging columns may still be potentially unsafe.3)Employing long-hole bolted connections ensures ideal axial tension and compression forces in hanging columns under various loading conditions.4)In moderate to high intensity seismic zones,hanging columns may be subjected to compressive forces under major earthquake combinations,necessitating a review of their compressive stability and bearing capacity.5)During minor earthquakes,the forces on hanging columns are dominated by dead and live loads,while in major earthquakes,the proportion of dead and live loads decreases and seismic forces become increasingly dominant.6)Rational placement of hanging columns,besides meeting architectural requirements,should also take into account the forces acting on the top of the core cylinder,reducing imbalanced bending moments at the cylinder top.7)Whether or not the top of the core cylinder is enclosed,an effective rigid connection with the roof suspension truss can be achieved.8)A reasonable yielding mechanism for cylindrical suspension structures involves the ductile failure process of the grounded core cylinder,starting from the cracking and damage of coupling beams and ending with the yielding of reinforcement and concrete crushing at the bottom wall of the cylinder.
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