Common Stability Problems for Design of Concrete Structures
The stability of concrete structure is not considered as vital as that of steel structure.This paper compares the provisions on overall stability of structure and members'stability in concrete design codes of China,Europe,USA and New Zealand,some relevant design suggestions are given by combining examples and formula deduction.For the overall stability,the rigid-gravity ratio value is affected by the resultant position of lateral forces,the magnitude and position of building gravity.The overall stability of different buildings should not be simply judged by the stiffness-weight ratio.For the stability of members,several common but easily ignored problems are analyzed:second-order effect should be considered for columns supporting bridges and cross-story columns;by reference foreign codes,the height-width ratio and lateral unbraced length of beam should be controlled for long-span and long cantilever beams;loads should be applied correctly when solving the effective length of columns by buckling analysis.The stability of shear walls is strictly restricted in China.In this paper,the critical height of outer wall in staircase and L-shaped shear wall limited by stability is given by comparing the equivalent load of stability of wall limbs with the limit load of axial load ratio.
overall stabilitysecond-order effectstiffness-weight ratiostability of shear wallscross-story columns
万方数据
维普
