西南交通大学学报

Simplified Calculation Research on Effects of Dynamic Amplification on Soft-Upper-Rigid-Down Hybrid Structures

XIONG Haibei, CHEN Lin, WU Ying, JIA Guocheng

2018, 53(2): 219-225. doi: 10.3969/j.issn.0258-2724.2018.02.001

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Abstract:
Soft-upper-rigid-down hybrid structures are more susceptible to the "whipping effect". Considering the effects of stiffness and mass ratios on the dynamic characteristics of structures, a simplified calculation method which can be used in engineering to determine the effects of dynamic amplification...

Evaluation of Wind Pressure Distribution for Large-Span Warpage Roof via Wind Tunnel Testing and Numerical Simulation

LIN Yongjun, SHEN Yanchen, LI Mingshui, LUO Nan

2018, 53(2): 226-233. doi: 10.3969/j.issn.0258-2724.2018.02.002

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In order to determine the wind pressure distribution characteristics of a large-span warpage roof structure, a wind tunnel test and numerical simulation were carried out for a large-span warpage roof. First, the distribution of roof pressure and influence of open doors and windows on the wind pressu...

Energy-Based Analysis of Anti-Seismic Performance of Latticed Shell in Coordination

ZHANG Ming, ZHOU Guangchun, ZHANG Keyue, JIA Hongyu, LI Lanping, ZHANG Deyi

2018, 53(2): 234-243. doi: 10.3969/j.issn.0258-2724.2018.02.003

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An analytical numerical model was rebuilt to reveal changes in local stress state in a single-layer reticulated shell under earthquake, as well as the relationship between the changes and structural failure loads. The numerical model was rebuilt based on the strain energy from nonlinear response his...

Construction Control System for Thousand-Meter-Scale Hybrid Girder Cable-Stayed Bridge Based on Double Target Control

XIE Mingzhi, YANG Yongqing, BU Yizhi, ZHAO Canhui, ZHANG Keyue, WANG Xuewei

2018, 53(2): 244-252, 321. doi: 10.3969/j.issn.0258-2724.2018.02.004

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To ensure the construction control of thousand-meter-scale hybrid girder cable-stayed bridges for high efficiency, precision, and safety, taking the Edong Yangtze River Bridge as a case study, research on the construction monitoring concept, monitoring method, and monitored parameters of the super-l...

Corrosion Rate of Non-Galvanized High-Strength Steel Wires under Different Temperature and Humidity Conditions

CHEN Xiaoyu, TANG Maolin

2018, 53(2): 253-259. doi: 10.3969/j.issn.0258-2724.2018.02.005

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This study helps to calculate the corrosion of steel wires of the main cable under different temperature and humidity conditions. The temperature and humidity conditions of the corrosive environment in which the main cable was placed were divided into five levels. Orthogonal experimental was conduct...

Distribution Characteristics of Welding Residual Stress at U Deck-to-Rib Connection Detail of Steel Box Girder

CUI Chuang, BU Yizhi, LI Jun, ZHANG Qinghua

2018, 53(2): 260-265. doi: 10.3969/j.issn.0258-2724.2018.02.006

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This study aimed to research the influence of residual stress on fatigue resistance at the deck-to-rib weld joint of steel box girder. Research on distribution characteristics of the field of residual stress is a precondition to verifying the influence on fatigue resistance. The study was conducted ...

Research of Calculation Method for Wave Forces Acting on Large-Scale Bridge Piers Based on Diffraction Theory

DENG Shasha, SHEN Huoming, LIU Lang, TANG Huaiping

2018, 53(2): 266-271. doi: 10.3969/j.issn.0258-2724.2018.02.007

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In order to make the MacCamy diffraction theory applicable to calculate the wave forces on large-scale bridge piers, a calculation method was analytically and numerically investigated. First, the effects of the cross-section dimension and cross-section shape on the bridge pier inertial force coeffic...

Simplified Method for Analysing Pile-Supported Embankment Settlements over Soft Soil

LIU Feicheng, ZHANG Jianjing, YAN Shijie

2018, 53(2): 272-278. doi: 10.3969/j.issn.0258-2724.2018.02.008

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A method for the settlement of pile-supported embankments over soft soil with due consideration of soil arching and pile-soil interactions is proposed. Traditionally, settlements comprising composite foundations and built under embankments are usually divided into two parts-reinforced and un-reinfor...

Field Comparative Experiments of Pipe Pile Composite Foundation with Different Cushion Layers

SHAO Guoxia, SU Qian, YING Zihong, LI Ting, XIE Kang, CAO Zhengguo

2018, 53(2): 279-285. doi: 10.3969/j.issn.0258-2724.2018.02.009

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In order to compare the stress and evaluate the ability to control deep soft soil settlement of three kinds of composite foundations, field experiments were carried out. Each pipe pile composite had a different cushion layer; a reinforced concrete slab, a geocell, and a geogrid, respectively. For th...

Physical and Mechanical Properties of Mud Pumping Soils in Railway Subgrade Bed

NIE Rusong, LENG Wuming, SU Yu, GUO Yipeng

2018, 53(2): 286-295. doi: 10.3969/j.issn.0258-2724.2018.02.010

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Substantial increase in train speed and axle load may result in an increase in the probability of occurrence of the mud pumping problem in subgrade bed. In this study, to further study the mechanisms and occurrence conditions of the mud pumping problem, more than 60 mud pumping samples reported in p...

Evolutionary Characteristics of Pore Structure of Fly Ash Shotcrete

ZHANG Junru, WEN Yumin, OU Xiaoqiang

2018, 53(2): 296-302. doi: 10.3969/j.issn.0258-2724.2018.02.011

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To study the mixture ratio of pore structure in fly ash shotcrete during operation, low-field magnetic resonance imaging technology was adopted. The micro-pore structure of the modified cementitious shotcrete with different fly ash content was investigated. The micro-pore size distribution character...

Test on the Stability of Soft Rock Tunnel with High Ground Stress Field Influenced by Direction of Maximum Horizontal Principle Stress

DAI Cong, HE Chuan, XIA Wuyang, LI Shiqi

2018, 53(2): 303-311. doi: 10.3969/j.issn.0258-2724.2018.02.012

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In order to study the influence of the principal stress in a high ground stress field on the stability of surrounding rock in soft rock tunnels, a completely self-developed test system "3D geotechnical model test system for tunnels" was used to conduct the large-scale three-dimensional geological me...

Face Stability Analysis of Shield Tunnel in Sandy Ground Using 3D DEM

WANG Jun, LIN Guojin, TANG Xie, HE Chuan

2018, 53(2): 312-321. doi: 10.3969/j.issn.0258-2724.2018.02.013

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Based on the model test carried out by Chambon and Corte, the three-dimensional discrete element method (3D DEM) was used to study the face stability of shallow shield tunnels in sand, and the face failure mechanism was investigated from microscopic perspectives. A three-dimensional flexible stress ...

Numerical Analysis of Effect of Jacked Pile on Performance of Buried Pipes

WANG Jiayong, XIAO Chengzhi, HE Chenxi

2018, 53(2): 322-329. doi: 10.3969/j.issn.0258-2724.2018.02.014

[Abstract](549)

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To analyse the influence of the driving process of jacked piles on the performance of adjacent buried pipes via the planar finite element method numerical simulation based on the displacement penetration method and achieve the dynamic pile driving process by establishing the pile-soil and pipe-soil ...

Study of Bedrock Surface Effect under Different Percentages of Rock

SUN Yongshuai, HU Ruilin

2018, 53(2): 330-336. doi: 10.3969/j.issn.0258-2724.2018.02.015

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The laws of deformation and failure of soil and rock mixtures under different percentages of rock were analyzed in this study, while considering the percentage of rock of the bedrock surface effect. Firstly, the intersection angle of bedrock surface and shearing surface was studied using an in-house...

Geostress Field Analysis of Futang Tunnel, before and after Wenchuan Ms8.0 Earthquake

LI Tianbin, CHEN Guoqing, YAN Jun, LUO Kai

2018, 53(2): 337-343. doi: 10.3969/j.issn.0258-2724.2018.02.016

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After an earthquake, such as the "5.12 Wenchuan earthquake", some of the high stresses in the hanging wall of seismic faults should be released. However, the rock mass surrounding the Futang Tunnel, is still under high stress, even after the earthquake, as evidenced by rockburst and core cracking. T...

GPS Derived Evolution of Strain Rate in Sichuan Region

XU Rui, D. Sarah·Stamps, HUANG Shengmu

2018, 53(2): 344-350. doi: 10.3969/j.issn.0258-2724.2018.02.017

[Abstract](447)

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To study the impact of the Wenchuan earthquake on the stress re-distribution and corresponding seismic potential of the southeastern Tibetan Plateau and Sichuan Basin, In this study, 355 GPS sites in the Sichuan region of the southeastern Tibetan Plateau were used to calculate 4 sets (1997-2008, 200...

Robust Control of the Air Conditioning System of an Electric Vehicle with Actuator Fault

HU Guangdi, WANG Guohui, LUO Huiyu, ZHOU Ke, LANG Xiaoyue

2018, 53(2): 351-358. doi: 10.3969/j.issn.0258-2724.2018.02.018

[Abstract](426)

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This paper is concerned with the development of an actuator fault model in the process of operation of electrical vehicle air conditioning system and the design of a state observer to observe the state of this system. Then established the uncertain system of air conditioning system based on linear m...

Diagnostic Method for High-Speed Train Bearing Fault Based on EEMD-TEO Entropy

JIN Hang, LIN Jianhui, WU Chuanhui, DENG Tao, HUANG Chenguang

2018, 53(2): 359-366. doi: 10.3969/j.issn.0258-2724.2018.02.019

[Abstract](498)

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To overcome the limitations of the between-class separateness of low-frequency signals of high-speed train bearing faults as well as the problem of fault identification of the cage, an adaptive diagnostic method based on the Teager energy operator (TEO) and ensemble empirical mode decomposition (EEM...

Temperature Compensation of Maglev Vehicle Gap Sensor Based on RBF-NN Optimized by PSO

JING Yongzhi, HE Fei, LIAO Haijun, WANG Ying, LIU Guoqing, DONG Jinwen

2018, 53(2): 367-373, 384. doi: 10.3969/j.issn.0258-2724.2018.02.020

[Abstract](456)

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In order to solve the temperature drift problem of a maglev vehicle gap sensor, a temperature compensator based on RBF-NN (radial basis function neural network) was designed to compensate the temperature drift error. A hybrid algorithm was proposed to combine PSO (particle swarm optimization) algori...

Development of Overmoded Coaxial to Two-Way Rectangular Waveguide Power Divider

ZHANG Jianqiong, LIU Qingxiang, LI Xiangqiang, LIANG Yuan, MEN Manzhou

2018, 53(2): 374-377. doi: 10.3969/j.issn.0258-2724.2018.02.021

[Abstract](425)

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To achieve the high-efficiency mode conversion of an overmoded coaxial waveguide to a two-way rectangular waveguide in high power microwave systems, an overmoded coaxial waveguide for two-way rectangular waveguide power divider is researched. The divider uses the radial line as a mode transition str...

Impact of Interacted Hazardous Actions on Injury Severity in Both-at-Fault Crashes

JIANG Xinguo, ZHANG Guopeng, SHI Xiaolin, XIA Liang, JIA Xiongwen

2018, 53(2): 378-384. doi: 10.3969/j.issn.0258-2724.2018.02.022

[Abstract](434)

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In order to understand the relationship between interacted hazardous actions and the injury severity in both-at-fault crashes, and alleviate the crash injury from the perspective of driving behaviour, the generalized ordered logit model was adopted by combining the characteristics of both-at-fault c...

Dynamic Robertson's Platoon Dispersion Model in Connected Vehicle Environment

YAO Zhihong, JIANG Yangsheng

2018, 53(2): 385-391. doi: 10.3969/j.issn.0258-2724.2018.02.023

[Abstract](498)

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The parameters of the traditional Robertson's platoon dispersion model are based on historical data, and thus, it cannot provide a good reflection of the dynamic characteristics of traffic flow. In order to solve this problem, a connected vehicle environment is considered, and the travel time of the...

Optimal Order Decision Making for Fresh Agricultural Products Delivered by High-Speed Railway

QIU Ge, WU Sheng

2018, 53(2): 392-399. doi: 10.3969/j.issn.0258-2724.2018.02.024

[Abstract](465)

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In the context of the fast speed of high-speed rail express transportation and the perishability of fresh agricultural products, this study constructed an optimal order decision-making model for the supply chain of fresh agricultural products. The exponential function model is proposed to measure th...

Flight Level Allocation Optimization to Reduce Greenhouse Effect

TIAN Yong, WAN Lili, YE Bojia, WANG Zhongfengyan

2018, 53(2): 400-405. doi: 10.3969/j.issn.0258-2724.2018.02.025

[Abstract](451)

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To reduce the regional environmental impacts of air traffic flow, this study investigated a green trajectory optimization method for reducing greenhouse effect. According to the characteristics of the regional sector aircraft and the flight conflict resolution method, the influences of CO₂ emissions...

Centralized Scheduling of Service Vehicles for Aircraft Turnaround Based on Partheno-Genetic Algorithm

ZHU Xinping, HAN Songchen

2018, 53(2): 406-413. doi: 10.3969/j.issn.0258-2724.2018.02.026

[Abstract](417)

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In order to solve the centralized scheduling problem of service vehicles for aircraft turnaround, a partheno-genetic algorithm with hierarchical encoding structure was proposed. The service activity number and vehicle number were employed to encode the control and parametric genes chromosome, respec...

Graphical Processing Method of High-Speed Railway Construction Progress Data

NING Xinwen, ZHU Qing, REN Xiaochun, HAN Zujie, WANG Hua, ZHAO Wen, ZHANG Heng

2018, 53(2): 414-419. doi: 10.3969/j.issn.0258-2724.2018.02.027

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A method for processing data by graphical construction was proposed to solve the problems pertaining to acquisition of railway construction progress data, such as a low degree of automation and standardization, complicated procedure, and coarse data granularity. The object-oriented method was first ...

Effects of Biochar on Hydrologic Performance of Bioretention

TIAN Jing, LIU Dan

2018, 53(2): 420-426. doi: 10.3969/j.issn.0258-2724.2018.02.028

[Abstract](443)

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A pilot-scale bioretention system with 4% (w/w) biochar amendment was installed to evaluate the impact of the biochar on the bioretention in the aspects of runoff infiltration, water retention and hydraulic residence time. Hydraulic conductivity tests and three bromide tracer experiments were conduc...

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2018 Vol. 31, No. 2