预应力钢-混凝土组合连续箱梁挠度分析
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摘要
对3片钢-混凝土组合连续箱梁跨中挠度进行了试验研究与理论分析,考虑开裂和滑移效应的影响,采用换算截面法和虚功原理建立了组合梁挠度计算表达式,推导了混凝土支座负弯矩区开裂长度计算表达式.研究结果表明,挠度理论计算值均与试验值吻合较好,预应力施加可提高混凝土开裂荷载,但对挠度的影响不显著.
The mid-span deflection of the three pieces of the steel-concrete composite continuous box beam is analyzed in this paper. The calculation expression of the deflection of the composite beam is created and that of the crack length in the negative bending moment region of the concrete bearing is deducted, both of which are achieved by considering the influences of cracking and slip effects and using the conversion section method and the virtual work principle. The research shows that the calculated values of the deflection theory are well in accord with the experimental values. The application of prestress can increase the cracking load of the concrete and delay the cracking of the concrete. The influence of the prestress on the deflection is not significant.
The mid-span deflection of the three pieces of the steel-concrete composite continuous box beam is analyzed in this paper. The calculation expression of the deflection of the composite beam is created and that of the crack length in the negative bending moment region of the concrete bearing is deducted, both of which are achieved by considering the influences of cracking and slip effects and using the conversion section method and the virtual work principle. The research shows that the calculated values of the deflection theory are well in accord with the experimental values. The application of prestress can increase the cracking load of the concrete and delay the cracking of the concrete. The influence of the prestress on the deflection is not significant.
引文
[1]胡少伟,胡汉林.预应力钢-混凝土组合箱梁抗弯试验研究[J].建筑结构,2013,43(6):58-63,81.
[2]HOU H T,LIUX,QU B,et al.Experimental evaluationof flexural behavior of composite beams with cast-in-place concrete slabs on precast prestressed concrete decks[J].Engineering Structures,2016,126(11):405-416.
[3]周春利.新型预应力钢箱-混凝土组合梁抗弯承载力分析[J].工业建筑,2014,44(3):150-157.
[4]CHENG J,YAO H.Simplified method for predicting the deflections of composite box girders[J].Engineering Structures,2016,128:256-264.
[5]项贻强,何超超,邱政.体外预应力钢-混组合梁长期滑移计算[J].浙江大学学报:工学版,2017,51(4):739-744.
[6]CHEN L H,LI S T,ZHANG H Y,et al.Experimental study on mechanical performance of checkered steel-encased concrete composite beam[J].Journal of Constructional Steel Research.2018,143(4):223-232.
[7]CHEN S M,WANG X D,JIA Y L.A comparative study of continuous steel-concrete composite beams prestressedwith external tendons:Experimental investigation[J].Journal of Constructional Steel Research,2009,65(7):1480-1489.
[8]胡少伟,龚洪波.部分剪力连接预应力连续组合梁抗弯性能试验研究[J].建筑结构,2013,43(6):64-67,33.
[9]周长村.体外预应力钢-混组合连续箱梁车桥耦合振动研究[D].福州:福州大学,2016.
[10]聂建国,陶慕轩.预应力钢-混凝土连续组合梁的变形分析[J].土木工程学报,2007,40(12):38-45.
[11]王子林.体外预应力钢-混凝土组合连续梁的变形计算[J].中国科技论文,2008,3(7):497-502.
[12]聂建国.钢-混凝土组合梁结构:试验、理论与应用[M].北京:科学出版社,2005.
[2]HOU H T,LIUX,QU B,et al.Experimental evaluationof flexural behavior of composite beams with cast-in-place concrete slabs on precast prestressed concrete decks[J].Engineering Structures,2016,126(11):405-416.
[3]周春利.新型预应力钢箱-混凝土组合梁抗弯承载力分析[J].工业建筑,2014,44(3):150-157.
[4]CHENG J,YAO H.Simplified method for predicting the deflections of composite box girders[J].Engineering Structures,2016,128:256-264.
[5]项贻强,何超超,邱政.体外预应力钢-混组合梁长期滑移计算[J].浙江大学学报:工学版,2017,51(4):739-744.
[6]CHEN L H,LI S T,ZHANG H Y,et al.Experimental study on mechanical performance of checkered steel-encased concrete composite beam[J].Journal of Constructional Steel Research.2018,143(4):223-232.
[7]CHEN S M,WANG X D,JIA Y L.A comparative study of continuous steel-concrete composite beams prestressedwith external tendons:Experimental investigation[J].Journal of Constructional Steel Research,2009,65(7):1480-1489.
[8]胡少伟,龚洪波.部分剪力连接预应力连续组合梁抗弯性能试验研究[J].建筑结构,2013,43(6):64-67,33.
[9]周长村.体外预应力钢-混组合连续箱梁车桥耦合振动研究[D].福州:福州大学,2016.
[10]聂建国,陶慕轩.预应力钢-混凝土连续组合梁的变形分析[J].土木工程学报,2007,40(12):38-45.
[11]王子林.体外预应力钢-混凝土组合连续梁的变形计算[J].中国科技论文,2008,3(7):497-502.
[12]聂建国.钢-混凝土组合梁结构:试验、理论与应用[M].北京:科学出版社,2005.