橫向約束部分預(yù)應(yīng)力混凝土高聳結(jié)構(gòu)延性系數(shù)研究
劉海成 1,張宇鑫2,郭全全3
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(1 沈陽建筑大學(xué)土木工程學(xué)院，沈陽 110168； 2 上海師范大學(xué)建筑工程學(xué)院，上海 201418； 3 北京航空航天大學(xué)土木工程系，北京 100083)［摘要］高聳結(jié)構(gòu)一般采用環(huán)形截面形式，隨著高度的增加，為滿足正常使用要求，普遍采用較高的預(yù)應(yīng)力度，由此導(dǎo)致延性降低，為此加強混凝土的橫向約束，以提高構(gòu)件的延性。根據(jù)周邊均勻配筋的環(huán)形截面的受力特點和平截面假定，應(yīng)用復(fù)合箍筋約束混凝土和核心鋼管混凝土的應(yīng)力應(yīng)變關(guān)系，進行了部分預(yù)應(yīng)力壓彎構(gòu)件延性系數(shù)計算。計算表明，普通預(yù)應(yīng)力混凝土構(gòu)件加入復(fù)合約束箍筋后，延性系數(shù)大幅提高，承載力提高幅度不大；加入核心鋼管后，延性系數(shù)和承載力均顯著提高。因此建議超高聳結(jié)構(gòu)混凝土塔筒優(yōu)先采用核心鋼管來提高延性和承載力。［關(guān)鍵詞］部分預(yù)應(yīng)力混凝土；高聳結(jié)構(gòu)；延性系數(shù)；環(huán)形截面；復(fù)合箍筋；核心鋼管Study on ductility factor of high-rise tower structure of partial prestressed concrete with confined ring sectionLiu Haicheng 1,2, Zhang Yuxin 1, Guo Quanquan 3(1 School of Civil Eng., Shenyang Jianzhu Univ., Shenyang 110168, China; 2 Architecture Eng. School, Shanghai Normal Univ., Shanghai 201418, China; 3 School of Civil Eng., Beihang Univ., Beijing 100083, China)Abstract:For partial prestressed concrete high-rise tower structure with ring section, in order to meet regular service, the higher prestress degree usually is applied. Therefore, it is necessary to correctly count ductility factor, strengthening transverse confinement of concrete is applied. According to the character of uniform reinforcement with ring section and assumption of strains of section keeping in plane, moreover stress-strain relationship of concrete confined by overlapping hoops and steel tubes, the formula of ductility factor for partial prestressed concrete pressure-bent member with ring section are put forwarded, which can be used as a reference for design and the related calculations. It is seen from the examples that the ductility factor increases when overlapping hoops are applied, in addition, both ductility factor and bearing capacity increase remarkably when central steel tubes are applied. For super high-rise tower structures, central steel tubes are suggested.Keywords:partial prestressed concrete; high-rise tower structure; ductility; ring section; overlapping hoops; central steel tubes*沈陽建筑大學(xué)青年基金2005。
