论文部分内容阅读
从震害统计和数值模拟两个方面研究了按现行抗震规范设计的钢筋混凝土框架结构的抗倒塌能力。汶川地震大量钢筋混凝土框架结构震害统计表明,按7度抗震设防的结构在地震烈度达到9度或加速度峰值达到400gal,开始出现倒塌破坏(占1%～2%);当地震烈度达到11度或加速度峰值达到800gal以上时,出现大量的倒塌破坏(占60%以上)。进一步以汶川强震记录为输入,对两个典型的钢筋混凝土框架结构进行了增量动力分析。结果表明:7度抗震设防时可抵御300gal～500gal加速度峰值作用(地震烈度近似9度);按8度抗震设防时可抵御400gal～600gal加速度峰值作用(地震烈度近似10度)。总体上看按现行抗震规范设计的钢筋混凝土框架的超强系数基本大于2。
The anti-collapse capability of reinforced concrete frame structures designed according to the current seismic code is studied from two aspects of earthquake damage statistics and numerical simulation. The seismic damage statistics of a large number of RC frames in Wenchuan Earthquake show that the structure with seismic fortification at 7 degrees begins to collapse (1% -2%) when the seismic intensity reaches 9 degrees or the acceleration peak reaches 400gal; when the earthquake intensity reaches 11 degrees Or when the acceleration peak reaches more than 800gal, a large amount of collapse and damage occur (over 60%). Taking the records of Wenchuan strong earthquakes as input, the incremental dynamic analysis of two typical RC frame structures was carried out. The results show that the seismic fortification at 7 degree can resist the acceleration peak of 300gal ~ 500gal (the seismic intensity is about 9 degrees), and the seismic peak at 400gal ~ 600gal (earthquake intensity is about 10 degrees) can be resisted by 8 degree earthquake fortification. As a whole, the super strong coefficient of reinforced concrete frame designed according to the current seismic code is basically larger than two.