Seismic Performance Design Research Of Grid Architecture Based On Failure Pattern Under Catastrophic Earthquake

With the rapid development of economy and society in China, large spanspace structures such as bamboo shoots after a spring rain in our country likeeach big city after another. High performance spatial grid structure by architectsfavored because of its unique shape and good economic benefit. However, ourcountry is in an earthquake prone area, large span space structure should havenot only met the large scale social activities of the function, but also need toprovide security for the people in the earthquake shelter when the earthquakeoccurred.Large span truss structure is the spatial structure of the multi-directionalstress, has the advantages of high stiffness, good stability, high safety, isconducive to the inside the shelter function planning, rational and effective useof building space. At present, the relevant national standard has design checkingspecific provisions only for large span truss structure under often encounterearthquake, and for performance under strong earthquake are not clearlydefined, this will inevitably lead to the existence of serious security risks in thedisastrous earthquake occurs. Therefore, this article will aim at the plate truss structure system under strong earthquake dynamic elastic-plastic response andbased on its destructive morphology research seismic design method.In this paper, based on the features of site conditions in Taiyuan area, withthe whole grid model with the lower part of the structure as the research object,has carried on the following work:(1) According to the current seismic code, established60*60m four squarepyramid space grid structure.(2) According to the seismic code, select appropriate seismic wave, elastoplastic time history analysis is carried out on the space truss structure(referred toas the primary structure), based on the failure form evaluation the seismicperformance, find its weak parts.(3) Through strengthen the weak part rods of primary structure, improvetheir seismic performance under strong earthquakes. The primary structuresystem to strengthen after called model two. According to the model two, tocarry out the plastic analysis of performance under strong earthquake, evaluationof performance under strong earthquake, until it meets the requirements ofearthquake disaster refuge.(4) By setting the isolation bearing, improve its seismic performance understrong earthquakes. The structural system will set the isolation bearings calledmodel three. According to the model three, to carry out the plastic analysis ofperformance under strong earthquake, evaluation of performance under strongearthquake， until it meets the requirements of earthquake disaster refuge. (5) Comparison and analysis performance of the three models under strongearthquake, study the design method and fortification requirements of disastrousearthquake shelter.The main conclusions of the study:(1) The current seismic design cannot meet the seismic refuge requirements,need to strengthen and add a section of rubber isolation bearings, to improve theseismic bearing capacity.(2) Based on the primary structure strengthen the weak parts of bar and addto the isolation bearings, then the "model two" seismic bearing capacityincreased by75.3%, the "model three" seismic bearing capacity increased by84.9%, have reached the requirements of seismic fortification earthquake shelter.(3) Under the action of seismic waves, the plastic hinge of the three kindsof structure distribution rule is similar: the plastic hinge upper chord and a lowerchord occurs mainly in the periphery of bar, plastic hinge brace appears mainlynear the periphery rod, that come in under7earthquake waves the calculationresults have reference.(4) The "model two" and "model three" respectively in the amount of steeland isolation bearing cost increases, but the structure of the seismic bearingcapacity improved significantly. The ductility performance of "model two" and"model three" significantly improved.