体外预应力混凝土简支梁的效率配筋设计
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摘要
通过对体外预应力混凝土简支梁中受拉区普通钢筋对结构工作性能的影响分析,明确了在体外索结构中普通钢筋的作用和截面的破坏机理,从充分利用材料强度及提供足够的截面延性出发,提出效率配筋的概念。根据截面的变形关系,推导出效率配筋下索极限应力增量和截面极限强度的计算公式。通过对截面变形参数沿梁长变化的分析,找出了其变化规律,确定了沿梁长方向的截面变形,从而求得锚固和转向点的位移并求出体外索的应力。在此基础上,通过简单的迭代计算,给出了不同转向方式和加载形式下效率配筋的计算方法。
Through the analysis for the effects of the ordinary steel reinforcement within external prestressed concrete simply supported beam in tension zone on the performance of structure, that the function of ordinary steel reinforcement in external tendon structure and the failure mechnism of beam section are clarified, and from the point of to utilize fully the strength of materials and to provide enough the ductlity of beam section, hence the concept of efficient reinforcement design is put forward. According to the relationship for the deformation of beam section, then the computation formulae for the ultimate stress increment of tendons and the ultimate strength of beam section under the efficient reinforcement design are derived. Through the variation of deformation parameters on beam section along the length of beam, the regularity of variation can be found to determine the deformation of beam section along the length of beam, thus the displacement at anchor zone and deviating point as well as the stress of external tendons are calculated. On the basis of above mentioned and by simply iteration calculation, finally the computation method of efficient reinforcement design under different deviation type and different loading condition is given.
Through the analysis for the effects of the ordinary steel reinforcement within external prestressed concrete simply supported beam in tension zone on the performance of structure, that the function of ordinary steel reinforcement in external tendon structure and the failure mechnism of beam section are clarified, and from the point of to utilize fully the strength of materials and to provide enough the ductlity of beam section, hence the concept of efficient reinforcement design is put forward. According to the relationship for the deformation of beam section, then the computation formulae for the ultimate stress increment of tendons and the ultimate strength of beam section under the efficient reinforcement design are derived. Through the variation of deformation parameters on beam section along the length of beam, the regularity of variation can be found to determine the deformation of beam section along the length of beam, thus the displacement at anchor zone and deviating point as well as the stress of external tendons are calculated. On the basis of above mentioned and by simply iteration calculation, finally the computation method of efficient reinforcement design under different deviation type and different loading condition is given.
引文
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[2] 牛斌.体外预应力混凝土梁极限状态分析[J].土木工程学报,2000,33(3) :7～15
[3] 杜拱辰.现代预应力混凝土结构[M].北京:中国建筑工业出版社,1986,199～231
[4] 陶学康.无粘结预应力混凝土设计与施工[M].地震出版社,1993,42～89
[5] 王宗林.体外预应力混凝土桥梁结构极限状态分析[D].哈尔滨:哈尔滨工业大学,2001． 6
[6] 王宗林.体外预应力混凝土简支梁的极限强度分析[J].哈尔滨建筑大学学报.2001,34(2) :114～118
[7] 王传志,滕智明.钢筋混凝土结构理论[M].北京:中国建筑工业出版社,1985,36～105
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