水电站半地下厂房结构抗震设计方案比选
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摘要
赤道几内亚吉部洛水电站厂房为半地下式厂房,原设计方案考虑在机组间设永久变形缝,但由于该厂房上游地下水位很高,厂房底部水头超过30 m,所以在上游边墙和楼板的分缝处会出现局部应力和变形过大。为减小应力和变形,另考虑后浇带方案,以增强其整体性。此方案下厂房成为一个整体结构,不存在变形缝,但同时也形成了超过50 m的大跨度混凝土高边墙和楼板结构,超出了厂房设计规范中允许的最大跨度,有必要对其进行论证。采用地震反应谱法并考虑动静叠加,对两方案在设计地震作用下的地震响应作了对比分析。结果表明:后浇带方案不仅能减小厂房局部应力和变形,还能使厂房满足抗震要求,优于原设缝方案。为类似存在高水头压力问题的水电站厂房设计提供可靠参考和借鉴。
For the semi-underground powerhouse of Jibuluo Hydropower Station,the original design scheme arranged permanent deformation joints between each unit;however,as the high underground water level at upstream face of the power house,exceeding 30 m at the bottom of power house,thus local large stress and deformation occurred at upstream sidewall and joint area.In order to lower the stress and deformation to enhance integrity,the scheme of late poured band was proposed.For this layout,the power house become a integral structure without deformation joint,but at the same time,a large span structure of high sidewall and floor slab are formed,which is larger than 50 m and exceeds the largest value in design code.Earthquake spectrum method is applied to analyze the seismic response of the two schemes under design earthquake load,in which the static and dynamic superposition are considered.The results show that the scheme of late poured band can reduce stress and deformation of power house and meet the requirement of anti-seismic.
For the semi-underground powerhouse of Jibuluo Hydropower Station,the original design scheme arranged permanent deformation joints between each unit;however,as the high underground water level at upstream face of the power house,exceeding 30 m at the bottom of power house,thus local large stress and deformation occurred at upstream sidewall and joint area.In order to lower the stress and deformation to enhance integrity,the scheme of late poured band was proposed.For this layout,the power house become a integral structure without deformation joint,but at the same time,a large span structure of high sidewall and floor slab are formed,which is larger than 50 m and exceeds the largest value in design code.Earthquake spectrum method is applied to analyze the seismic response of the two schemes under design earthquake load,in which the static and dynamic superposition are considered.The results show that the scheme of late poured band can reduce stress and deformation of power house and meet the requirement of anti-seismic.
引文
[1]中国水利水电科学研究院.SL5073-2000水工建筑物抗震设计规范[S].北京:电力出版社,2000.
[2]张燎军.闸涵结构的抗震分析[J].世界地震工程,2003,19(2):67-71.
[3]刘建峰.水电站地下厂房动力特性研究及地震反应分析[D].大连:大连理工大学,2007.
[2]张燎军.闸涵结构的抗震分析[J].世界地震工程,2003,19(2):67-71.
[3]刘建峰.水电站地下厂房动力特性研究及地震反应分析[D].大连:大连理工大学,2007.
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