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Lockup装置对高墩桥梁的减震作用的Midas建模分析
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作者 陈大鹏 《华东公路》 2017年第1期14-16,共3页
地震对于建筑物的破坏极大,尤其对比较高的结构,如高墩桥梁,地震中墩顶位移极大,破坏严重,给震后救灾和重建工作造成很大的难题。所以抗震措施一直是历代桥梁工程师所关注的问题。如今桥梁抗震主要有被动控制和主动控制方法,主动控制方... 地震对于建筑物的破坏极大,尤其对比较高的结构,如高墩桥梁,地震中墩顶位移极大,破坏严重,给震后救灾和重建工作造成很大的难题。所以抗震措施一直是历代桥梁工程师所关注的问题。如今桥梁抗震主要有被动控制和主动控制方法,主动控制方法需要在地震时主动对结构施加控制作用,实现起来困难较大,所以被动控制较为常用,lockup装置就是其中一种。高墩桥梁自振周期长,在地震中有其独特的特点。采用midas有限元软件建立了模型进行了地震波输入,分析了lockup装置对于高墩桥梁抗震的作用效果。 展开更多
关键词 高墩桥梁 lockup装置 有限元 减震
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The Impact of Initial Public Offering Lockup Expirations on Liquidity:Evidence from Chinese Stock Market
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作者 储小俊 《Journal of Shanghai Jiaotong university(Science)》 EI 2016年第1期81-89,共9页
Previous empirical evidence on the liquidity effect to the lockup expiration is mixed. A sample from Chinese listed firms is adopted and contributes to better understand this effect in emerging markets. The spread and... Previous empirical evidence on the liquidity effect to the lockup expiration is mixed. A sample from Chinese listed firms is adopted and contributes to better understand this effect in emerging markets. The spread and illiquidity significantly increases around lockup expiration in China. Furthermore, the liquidity reaction to firms' disclosure quality is explicitly related. The results confirm that higher disclosure quality is significantly associated with lower abnormal spread and illiquidity impact. The effect of lockup expiration shares on liquidity proxies differs in firm disclosure quality. Identifying the factors affecting liquidity around such events may help regulators develop policies to provide investors with greater confidence in their investments. 展开更多
关键词 initial public offering(IPO) lockup expirations LIQUIDITY insider trading
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