Theorem Analysis And Practice Studies On Frame-Shear Wall Super Structure Co-opration

The mechanism of frame-shear wall super structure co-operation has the very close relationship with the relative stiffness ratio between frame and shear wall (FW), and it has certain varational discipline. By studying the internal relationship and the varational disipline, this paper is aimed to establishing the effective varational range and the optimal working state of FW elastic stage, to establishing the reasonable beading order of nonline stage and the optimal beading mechanism. And the final purport exsits in that FW could resist all sorts of horizontal earthquake loud.This paper centered around discussing the bearing power, stiffness, distortion, no-line energy-dissipating ability of FW and establishing the corresponding conclusion about FW super structure co-operation. As follows is the symastic studying content.In elastic stage, based on the rule of equal apical displacement, the basical formulae of EJ_d corresponding co-operation and non co-operation were established by analytic method, and the comparative analysis were carried out. Then through the relative analysis among EJ_d, internal force and story drift, the effective varational range and the optimal working state were established. On the basis, an example of the practical engineering about frame-shear wall was given. In this example, the thickness of shear wall, the section size of frame beam, the total bend-resistant stiffness of shear wall and the total shear-resistant stiffness were changed, while other structural parameters remain fixed. And these data was arranged according to the certain rule. Hence eight typical groups were further studied. The result showed that co-operation is effective when characteristic value λ is between 1.5-2.5 and the cooperation is optimal when λ is around 2.0.In nonline stage, by analyzing the relationship among story drift angle, stiffness degradation and internal distribution, the worst state and the varational rule about carrying capacity were established. Then combining the comparative analyzation about the factors affecting ductility of structure, hysteretic curve characteristic, effective plastic mechanism, the main energy dissipation member in FW and the main resisting force member resistant deformability, the effective FW plastic mechanism wasestablished. The main mechanism is (1)LL-KL-QG-ZD;(2) the main energy dissipation member is constrained by the main resisting force member that still keep elastic. The fundamental measures that assure effective FW co-operation shoud manage to prolong this stage. And the measures should be taken on the basis of the present code that improve KZ resisting force and deformabilty and lessen column section.The main factors affecting the ductility of columns are reviewed, and two methods are propsed for improving the bearing capacity and ductility of the traditional RC columns. co-operation,on frame-shearwall structure is needed to be done in order to get the best yielding mechanisms .different effect of variable total stiffness on the above structural parameters, but also pointed out the rules among them, which contribute to well understand the mutual effect of frame-shear structure.Finally, the conclusion about the super structure co-operation was proved by FW pseuodo-dynamic test and model dynamic test.