Vertical Acceleration Effects on the Soil-Structure Interaction of Multistory Buildings

垂直加速度對樓房之土壤結構互制作用之影響

巫垂晃(Tsui-Huang Wu) ； 林炳昌(Bing Chang LIin)

《中原學報》 26卷1期 (1998/02) Pp. 27-38

https://doi.org/10.6358/JCYU.199802.0027

摘要

本文針對樓房之土瓖結構互制分析公式增加考量垂直加速度之影響。單自由度模式用以模擬有軟弱地面層的樓房。此分析模式考慮了篡礎座落於黏彈性土瓖中，同時也包含P一△效應之影響於結構系統裹。經由以1995年1月17日的阪神地震記錄作為地表振動的算例中顯示，垂直加速度的考量加強了P一△效應，進而增加結構體之側向變形及樓層剪力，導致此類增加現象的有關因素包含土瓖狀況、結構體柔軟度及柱子所受之軸力與臨界載重比值等，值得吾人特別注意。

關鍵字

p-∆效應 ； 土壤結構互制 ； 高樓 ； 黏彈半空間

並列摘要

In this paper, a method is proposed for the soil-structure interaction analysis which includes both horizontal and vertical earthquake effects. A single-degree-of-freedom system is adopted to model multistory buildings with a soft first story [I]. The model is analyzed as a linear elastic system with a rigid footing, which rests on the surface of a viscoelastic half space. The proposed procedure also include the second order P-A effecs on the system.
A numerical example is presented, in which the seismic response of the superstructure together with its foundation system is analyzed, and based on the earthquake data recorded at JMA Kobe Observatory on Jan. 17, 1995. It is found that the vertical acceleration aggravates the P-A effects. This leads to significant increases in the lateral deflections and story shears. The increases are a function of soil condition, the structural flexibiliy and the ratio of axial force to the critical load of the columns.

並列關鍵字

P-∆ effecs ； soil-structure interaction ； multistory buildings ； viscoelastic half spaces