考虑车辆随机停放的停车楼减震设计与可靠度分析

Shock absorption design and reliability analysis of parking building considering random parking of vehicles

在停车楼的设计中通常将车辆荷载以活荷载的方式均匀分布到结构上,实际上受车辆随机停放的影响,停车楼结构整体质量中心偏移,一旦结构遭遇罕遇地震时,车辆的随机停放可能造成停车楼结构发生扭转破坏。本文在传统减震设计方法的基础上考虑车辆活荷载的随机性,并从可靠度的角度验算减震结构在大震作用下的倒塌概率。结果表明,相同的减震设计布置在考虑车辆随机性前后,减震停车楼的倒塌概率为0和2.47%。因此未考虑车辆随机停放的传统减震设计方法实际上高估了结构的抗震性能,减震停车楼结构在大震作用下仍存在倒塌的风险。

In the design a car of the parking building,the vehicle load is usually evenly distributed to the structure in the form of live load.In fact,due to the random parking of a vehicle,the overall center of mass of a parking building structure is offset.Once such a structure encounters an earthquake,the randomness due to vehicle parking may cause torsional damage to the structure.In this paper,the randomness of vehicle distribution is considered on the basis of traditional shock-absorbing design methods,and the probability of collapse of the shock-absorbing structure under the action of large earthquakes is analysed from the perspective of reliability.The results show that the collapse probability of the shock-absorbing car parking building is 0 and 2.47% before and after considering the randomness of vehicles with the same shock-absorbing design layout.Therefore,the traditional shock-absorbing design method that does not consider the random parking of vehicles actually overestimates the seismic performance of the structure,and the structure of the shock-absorbing parking building still has the risk of collapse under the action of large earthquakes.