Research On Applicable Maximum Height Of Masonry Structure And Frame Structure For Intensity 8 (0.3g)

"Code for Seismic Design of Building" regulate that there are two zones of design basic acceleration of ground motion in zone 8 of fortification intensity responds, ie: 0.2g and 0.3g. The code regulates that the earthquake actions are calculated respectively in these two zones but adopts nearly the same seismic measures. In the actual engineering design,beaucause the earthquake action in zone 8(0.3g) is 0.5 times heavier than in zone8 (0.2g), the maximum applicable height and number of stories of Masonary structure shall not exceed 6 layers and 18 meters,and the maximum applicable height of frame structure for intensity 8 shall not exceed 45 meters in the code ,which is not suitable for zone 8 (0.3g). Based on several floor plans, this paper analyzed the applicable height of masonry structure and frame structure in zone 8(0.3g),and drawed main conclusions as follows:(1) 8 floor plans of three types of the masonry structure are chosen and the sofeware PKPM is used to carry on structural design and seismic resistance design and to compare the differences in applicable height as well as the number of stories between zone 8(0.2g) and zone 8 (0.3g) ,then the conclusion is made that the applicable height and number of stories in zone 8(0.3g)should reduce by one and 3 meters than in zone 8(0.2g). The paper proposed that the regulation that the applicable height and number of stories of masonry should not exceed 6 layers and 18 meters " in "Code for Seismic Design of Building should be modified as not exceed 5 layers and 15 meters.(2) 4 diferent floor plans of frame structure in zone 8(0.3g) with site-class 2 and 1st and 2nd design seismic groups are chosen and SATWE procedure of software PKPM is utilized to design and analyze different numbers stories of frame structure; The changing laws of the steel weight per square meter and the sectional dimension of frame structure with the increasing height and floor in zone 8(0.3g) are analyzed . On the basis of camparison with the steel weight per square meter and the applicability of frame and frame-wall structure ,conclusion is made that the applicable height of the frame structure in zone 8(0.3g)with site-class 2 and 1st group and 2nd design seismic groups should not exceed 30 meters. In addition, the differences of the steel weight per square meter in frame structure between in zone 8(0.2g) and zone 8(0.3g) are compared.