预应力钢-混凝土组合梁的抗弯承载力研究

聂建国; 周天然; 秦凯; 高璀旭

doi:10.13204/j.gyjz200312001

预应力钢-混凝土组合梁的抗弯承载力研究

doi: 10.13204/j.gyjz200312001

基金项目:

国家重点基础研究发展计划资助项目(2004CB619105)

计量
- 文章访问数: 49
- HTML全文浏览量: 11
- PDF下载量: 12
- 被引次数: 0
出版历程
- 收稿日期: 2009-05-18
- 修回日期: 2009-05-18
- 刊出日期: 2003-12-20

Funds:

Supported by National Basic Research Program of China (No.2004CB619105)

摘要

摘要: 建立了预应力钢 -混凝土组合梁考虑滑移效应和预应力筋内力增量的弹性抗弯承载力计算公式，提出了预应力钢 -混凝土组合梁考虑预应力筋内力增量的极限抗弯承载力的两步计算法。计算结果与试验结果吻合良好。建议的计算公式对预应力钢 -混凝土组合梁的设计具有实用参考价值

Abstract: Objective To summarize the clinical features and analyze the serologic test results of latent syphilis. Methods The clinical data of 601 patients with latent syphilis who were treated in the sexually transmitted disease centre of Peking Union Medical College Hospital between January 2001 and November 2007 were retrospectively analyzed. Results Of the 601 cases of latent syphilis,there were 174 cases of early latent syphilis(EL),170 cases of late latent syphilis(LL),and 257 cases of unknown latent syphilis. Male to female ratio was 0.74:1（256 males and 345 females,respectively). Patients aged 20-39 years accounted for the largest proportion. Non-marital sexual intercourse was the main route of infection. Forty-six patients (7.65%) were co-infected with other sexually transmitted diseases. A total of 251 cases of latent syphilis (41.76%) were confirmed when the patients were receiving tests for other sexually transmitted diseases or suspected sexually transmitted diseases. Of the 601 patients with EL,LL and unknown latency,the proportion of serum rapid plasma reagin(RPR) titers higher than or equal to 8 were 72.99% (127/174),52.94% (90/170),and 60.31%(155/257),respectively. Compared with the early syphilis,serological negative conversion rate was significantly lower after treatment for l2 months in the early latent syphilis patients (P=0.044). Conclusion Education and awareness raising on syphilis should be strengthened to lower the prevalence of latent syphilis.

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参考文献(12)

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