A Study On Displacement Angles Of Reinforced Concrete Frame-Wall Buildings

Stressing on controlling the displacement of structure is the core of performance basedseismic design. All the current building designs adopt force based methods, which are unableto effectively control structure damage and give play to the effective role of displacement instructure design. To address the above mentioned problems, this thesis aims to put forward ayield-based classification of elastic-plastic behaviors, and conduct a statistical analysis on theroof drift and story drift of different elastic-plastic behaviors, and put forward a new methodof earthquake resisting behavior evaluation on the basis of displacement angle and horizontalearthquake influence coefficient.The main contents of this thesis are summarized as follows:(1)A pushover analysis is conducted on four reinforced concrete frame-shear walls.Different elastic-plastic behaviors are quantified based on yield. By studying the changes ofthe roof drift and story drift of different elastic-plastic behaviors, the thesis analyzes theperformance level and damage degree. Moreover, the thesis studies the structure deformationby using pushover analysis, first vibration mode and simplified theoretical formulas.(2)The thesis compares the vibration period empirical formulas of reinforced concreteframe-shear wall of various countries, which are then compared with the simulated results.Energy methods is introduced to analyzing the instantaneous period and instantaneousdamping ratio of structure of different elastic-plastic behaviors.(3)Transformation methods of equivalent single-degree-of-freedom system influenced bymulti modes are put forward. The thesis computed the equivalent period and equivalentdamping ratio of the structure by using seven methods of equivalent linear, and then comparesthe results with those coming from energy methods, so as to evaluate the precision of thosemethods applied to computing elastic-plastic behaviors of structure. Then the thesis providesrational proposals for choosing methods of equivalent linear to compute equivalent period andequivalent damping ratio of the structure.(4)The thesis introduces a new method of earthquake resisting behavior evaluation basedon displacement angle and horizontal earthquake influence coefficient. The specific methodsare as follows: transforming Sa-Sdcurve into-Sdcurve; categorizing-Sdcurve into two phases minor earthquake and major earthquake according to the limit of elastic-plastic storydrift (1/800); comparing-Sdcurve with earthquake influence (under prescriptive seismicintensity) in minor earthquake and in major earthquake respectively. Therefore, throughcomparing horizontal earthquake influence coefficient with story drift, earthquake resistingbehavior can be evaluated.(5)Through a pushover analysis, the thesis analyzes the changes of roof drift and storydrift of the structure after the installation of fluid viscous damper and viscoelastic damper, andquantifies the earthquake resisting behavior based on drift.