Analysis Of Collapse Resistance Performance Of Type B And Type C RC Frame Structures

In recent years,earthquakes had occurred frequently all over the world,and our country has also experienced two major earthquakes in Yushu and Wenchuan.These two earthquakes have caused the huge property losses and casualties of our country.In my country,reinforced concrete(RC)frame structure is the most common and widely used structural forms of one.However,in the major earthquakes that have occurred in the history of the world,the seismic performance of the RC frame structure did not meet people’s expectations and expectations.The actual collapse probability was too high,exposing problems such as weak collapse resistance and insufficient redundancy.,Especially the collapse of the school building,causing huge casualties.In order to have reference data in the actual design,this paper takes a small school building in the form of RC frame structure as the research object.The school building has a 4-story frame structure with a floor height of 4.2m and a span of 9.8m and 8.7m.It has different intensities.Research on the collapse resistance performance under the action of rare earthquakes and large earthquakes.The main findings are:(1)Class B and Class C RC frame structures under 6 degrees(0.05g),8 degrees(0.2g),8degrees(0.3g)seismic fortifications have low failure probability under rare earthquakes and large earthquakes It is acceptable that some key components and weak parts can be strengthened in the actual design of the Category C RC frame in the 8 degree(0.2g)area and 6degree(0.05g)area.The Category B RC frame structure under 7 degrees(0.1g)and 7 degrees(0.15g)seismic fortifications has a moderate failure probability under rare earthquakes and large earthquakes.It should be strengthened corresponding to key components and weak parts.Category C RC frame The failure probability of the structure is too high and unacceptable.In the actual design,the overall structure should be strengthened,and there should be some margin relative to the specification index.(2)Use the incremental dynamic analysis method to supplement the analysis of the RC frame structure,draw the IDA curve and obtain the seismic acceleration Sa(T1,5%)of theactual collapse of the RC frame structure under various intensities,compare the dynamic time history analysis and As a result of incremental dynamic analysis,it is found that the peak seismic acceleration during incremental dynamic analysis is much higher than that of a super-large earthquake.It can be judged that the building collapse criteria based on deformation is conservative.