Email this Article Past Issues | Current Issue Complete this form to e-mail a link to this article to a friend or colleague. YAN Yong- hong , GUO Qiu- dong , ZHANG Zhi- yong.[J].Journal of Civil, Architectural & Environmental Engineering,2007,(2):15-18 E-mail to: (to whom you're sending this) Your e-mail address: Your name: Your comments to add to the e-mail: I thought you would find this article interesting. Verification code:

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