Comparative Study On Control Methods Of Earthquake-induced Failure Patterns Of RC Frame Structures In China And Japan

The reasonable failure pattern of structures under earthquake attack is critical forthe achievement of seismic design objectives. Therefore current seismic design coderequires three levels of seismic performance. Under frequent earthquakes structuresshould be restrained from any damages. Under design level earthquakes structures areallowed to develop reparable damages. Under rare earthquakes structures should notcollapse. The reasonable failure pattern is very important for structures to ensurereliable performance under strong or even mega earthquakes and worth paying muchattention during seismic design. The Chinese seismic design code provides plenty ofprovisions regarding the failure mode selection and the corresponding design approach.However， the code preferred failure modes were rarely realized during the strongearthquakes. In addition the structural engineers don’t invest sufficient effort into theanalysis and research on structural failure mechanism under strong earthquakes.In this paper the failure patterns observed in Wenchuan earthquake and the eastJapan earthquake are summarized and studied. The design philosophy and detailedapproach for control of the failure patterns of two typical RC frame structures in Chinaand Japan are compared. Based on the specific example. The design structure fordifferent seismic records and different earthquake intensity of input.And Compared toits role in earthquake under different nonlinear dynamic reaction of the state.Withcorresponding evaluation index of injury damage order and damage degree the threefactors the main research contents and results are as follows：①Japan take the quake zone coefficient Z=1for structure and China structure take8degrees0.2g area. The first step in design between the two countries are the same. In thesecond step design China to adjust the spring internal force and structure area meet，and Japan’s second step design should be done quantitative calculation. This articleintroduced the Japanese second step design method and presents the second step keeplevel of endurance pushover analysis process.②China design method not strictly abide by the bearing capacity ductility standards，and Japan with parameters Ds to reaction in the ductility of the structure under strongearthquakes. And then use this as the bearing capacity reduction.This is not only in thebasic law and clearly has to quantitative way more accurately match.③Building structure under the role of strong earthquake in show obvious nonlinear behavior.The japanese design considered the internal force distribution and the stress ofthe component heavy state. This more tally with the actual situation.This article throughthe elastic-plastic time history analysis between the examples that contrast structureJapan to control structure in the earthquake happened under the expected failurepatterns.