| 陈厚群.关于坝体混凝土的强度分级、结构抗力标准值及其分项系数[J].中国水利水电科学研究院学报,2020,18(2):81-85 |
| 关于坝体混凝土的强度分级、结构抗力标准值及其分项系数 |
| On the strength grading，characteristic value of structural resistance and its partial coefficients of dam concrete |
| 投稿时间：2020-01-06 |
| DOI：10.13244/j.cnki.jiwhr.2020.02.001 |
| 中文关键词: 坝体混凝土 强度分级 结构抗力 标准值 分项系数 |
| 英文关键词:dam concrete strength grading structural resistance characteristic value partial coefficients |
| 基金项目: |
|
| 摘要点击次数: 1062 |
| 全文下载次数: 1294 |
| 中文摘要: |
| 坝体混凝土的强度分级、结构抗力标准值及其分项系数等参数是混凝土坝设计规范中的重要参数，针对目前各有关规范之间对这些参数存在诸多与国家标准《水利水电工程结构可靠性设计统一标准》不相一致之处，本文指出：在对坝工混凝土强度分级中，由标号R（kg/cm2）改为以等级C（N/mm2）表示后，最近的重力坝和拱坝设计规范中又采用按Cd（N/mm2）和C90（MPa）分级，显然有违与国际标准保持一致及与其它有关规范相协调的初衷；对修编中的拱坝设计规范中，不能以坝体混凝土湿筛试件替代承载能力极限状态方程中的结构抗力的材料性能标准值；在从单一安全系数套改分项系数时，不能改变结构抗力的分项系数γm和结构系数γd的内涵，并将两者混淆。最后，为使这些参数与与国家标准《水利水电工程结构可靠性设计统一标准》相协调，提出了相应修改建议。 |
| 英文摘要: |
| The strength grading,characteristic value of structural resistance and its partial coefficients of dam concrete are the important parameters for design of concrete structures. There are many inconsistencies between the current dam design codes and the national standard Unified standard for reliability design of hydraulic engineering structures for these parameters. In this paper the following problems are pointed out. In the classification of the strength of the dam concrete,after the grade is changed from the mark R(kg/cm2) to the grade C(N/mm2), recently another Cd(N/mm2) and C90(MPa) classification rules have been adopted in the revised design codes of concrete gravity and arch dams. Obviously, it is against the original intension of keeping consistent with international standard and other relevant design codes. Also,in the bearing capacity limit state equation the characteristic values of structural resistance cannot be replaced by the characteristic values of wet-sieved test specimen as in the arch dam design code. Besides,when the values of partial coefficients are defined from the singular safety factor, the implications of these partial coefficients shall not be modified and confused. Finally, in order to coordinate all these parameters with the Unified standard for reliability design of hydraulic engineering structures, some modification suggestions are put forward. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
