Research On Seismic Design And Example Analysis Of L-shaped Irregular Plane High-rise Frame-Shear Structure

In recent years, all previous strong earthquakes in domestic and these buildingearthquake damage show that: plane regularity of the structure has an important impacton their seismic performance, the torsional effects of the irregular plane structure isserious, would not only increase the seismic damage, even at some point will become amajor factor leading to structural damage. In practical engineering design, to the needsof constructional function and forms, high-rise buildings with irregular planearrangement often will encounter. According to the current seismic code requirements toassess the level of structural irregular arrangement, taking reasonable analysis modeland control index of the rotation calculation are very important. Combined withengineering example, this article launches the research, aiming at the above problems.First of all, the article sorts out the relevant provisions of the current specificationabout the irregular structure; an in-depth analysis will be done to the structure torsionfailure mechanism, torsion deformation, main influence factors and the controlrequirements of structural torsional effects; and discusses the necessity of elastoplasticanalysis on the L-shaped irregular plane structure and it’s analysis method of seismicresponse.By using the SATWE module of PKPM series structural calculation software, theL-shaped irregular plane frame-shear wall structure was applied modal analysis andtime history analysis. Several control indicators are studied to determine whether itmeets the requirements, such as displacement ratio, cycle ratio and story drift.By running the static elastic-plasticity analysis to L-shaped irregular plane frame-shear wall structure from different directions in PERFORM-3D, determined the mostunfavorable direction of horizontal seismic action in the structure, analyzed the roof displacement and story drift to determine whether it meets seismic performanceobjectives of the frequent earthquake and rare earthquake, studied the weak story.Using PERFORM-3D to run dynamic elastoplastic analysis in the bi-directionalearthquake force on the structural model, established in the static elastic-plasticityanalysis. Analyzed roof displacement and story drift of the structure to determinewhether it meets the seismic performance objectives of the frequent earthquake and rareearthquake; studied the weak story.Finally, the paper comparatively analyzed roof displacement, story drift and weakstory of three different analysis states of the structure; specifically assessed the seismicperformance in the bi-directional seismic forces of the L-shaped irregular plane frame-shear wall structure, some engineering suggestions were given for the structuraloptimization design.