﻿ 基于正交试验法的大跨连续刚构桥主梁设计参数影响研究 Research on Long-Span Continuous Rigid Frame Bridge Girder Design Parameters Impact Based on Orthogonal Experiment

Hans Journal of Civil Engineering
Vol.06 No.04(2017), Article ID:21325,7 pages
10.12677/HJCE.2017.64044

Research on Long-Span Continuous Rigid Frame Bridge Girder Design Parameters Impact Based on Orthogonal Experiment

Feng Tang1, Yao Lu2*, Dejian Li2, Jiao Xiong3

1Second Engineering Co. Ltd. of CCCC Fourth Highway Engineering Co. Ltd., Beijing

2School of Civil Engineering, Central South University, Changsha Hunan

3Hunan NO.4 Engineering Corporation Co. Ltd., Changsha Hunan

*通讯作者。

Received: Jun. 25th, 2017; accepted: Jul. 8th, 2017; published: Jul. 12th, 2017

ABSTRACT

The design parameters, central beam high-span ratio, high-span ratio at root of the beam and beam bottom curve line, of continuous rigid frame bridge girder were valued in an appropriate range. Based on orthogonal experiment and numerical simulation, the effects of above parameters to the comprehensive performance index on the basis of stress, deflection and concrete volume were studied by the parameters combinations and the calculation of the text models. The result shows that the central beam high-span ratio has the greatest impact on the comprehensive performance index, while the high-span ratio at root of the beam and the beam bottom curve line have less influence. In addition, the impact of the beam bottom curve line is larger than the high-span ratio at root of the beam.

Keywords:The Continuous Rigid Frame Bridge, Girder Design Parameters, Orthogonal Experiment, Parameters Impact

1中交四公局第二工程有限公司，北京

2中南大学土木工程学院，湖南 长沙

3湖南省第四工程有限公司，湖南 长沙

1. 引言

2. 工程背景

3. 正交表选择

Figure 1. Overall arrangement of the bridge

Figure 2. The sectional drawing of 0#block

Table 1. Orthogonal array (45)

Table 2. Orthogonal table for optimization of girder parameters

4. 连续刚构桥主梁参数的正交试验

4.1. 正交试验参数组合的有限元模型

4.2. 优化指标的确定

Figure 3. The finite element model of the bridge

Figure 4. The arrangement of prestressed steel bundle

Table 3. Calculation results of combination of different parameters

——主跨跨中最不利荷载组合下的最大应力；

——C55混凝土抗拉强度标准值， = 2.74 MPa；

——主跨跨中最不利荷载组合下的挠度；

——主跨中长期挠度限值， = 1/1600L = 11.875 cm；

——结构混凝土用量指标，取模型桥梁总质量；

——实际工程的桥梁总质量。

4.3. 极差分析

Table 4. Comprehensive analysis results of combination of different parameters

Table 5. Range analysis of synthetic indexes

Figure 5. The drawing of comprehensive evaluation index

5. 结论

1) 采用正交试验法对连续刚构桥主梁设计参数进行多目标综合优化分析可以在确保参数取值均匀分散的基础上有效控制样本数量，提高计算效率。计算结果表明最不利荷载下的跨中弯矩和挠度随着0号块梁高及跨中梁高的增加而减小，并随着梁底抛物线次数的增加而增大。全桥混凝土用量随着0号块梁高及跨中梁高的增加而增大，并随着梁底抛物线次数的增加而减小。

2) 当以主梁跨中截面应力、挠度、混凝土用量的最佳性能进行多目标综合优化时，应采取相对较大的主梁梁高以及较小的梁底抛物线次数。

3) 正交试验表明，当连续刚构桥主梁设计参数采用0号块梁高高跨比为0.065 (12.4 m)，梁底抛物线次数为1.5次，跨中梁高高跨比0.021 (4.0 m)时，可以获得在当前目标下较好的主梁综合性能。对综合指标的极差分析表明，跨中梁高对综合性能指标具有很大的影响，而梁底抛物线次数，0号块梁高的影响相对较小。

Research on Long-Span Continuous Rigid Frame Bridge Girder Design Parameters Impact Based on Orthogonal Experiment[J]. 土木工程, 2017, 06(04): 378-384. http://dx.doi.org/10.12677/HJCE.2017.64044

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