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Field test on temperature field and thermal stress for prestressed concrete box-girder bridge

Baoguo CHEN, Rui DING, Junjie ZHENG, Shibiao ZHANG

《结构与土木工程前沿（英文）》 2009年第3卷第2期页码 158-164 doi: 10.1007/s11709-009-0002-9

摘要： A field test was conducted to investigate the distribution of temperature field and the variation of thermal stress for a prestressed concrete (PC) box-girder bridge. The change of hydration heat temperature consists of four periods: temperature rising period, constant temperature period, rapid temperature fall period and slow temperature fall period. The peak value of hydration heat temperature increases with the increasing casting temperature of concrete; the relation between them is approximately linear. According to field tests, the thermal stress incurred by hydration heat may induce temperature cracks on the PC box-girder. Furthermore, the nonlinear distribution of temperature gradient and the fluctuation of thermal stress induced by exposure to sunlight were also obtained based on continuous in-situ monitoring. Such results show that the prevailing Chinese Code (2004) is insufficient since it does not take into account the temperature gradient of the bottom slab. Finally, some preventive measures against temperature cracks were proposed based on related studies. The conclusions can provide valuable reference for the design and construction of PC box-girder bridges.

关键词： box-girder bridge field test hydration heat temperature field temperature gradient thermal stress

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西堠门大桥北边跨锚侧钢箱梁安装技术

卢伟,邓亨长,张胜利,杨明,虞业强,李平利,李润哲,肖安斌

《中国工程科学》 2010年第12卷第7期页码 47-52

摘要：

西堠门大桥为国内最长的两跨连续跨海钢箱梁悬索桥，桥址处恶劣的自然环境，使得大桥北边跨锚侧钢箱梁安装面临诸多难题，文中介绍了该位置钢箱梁安装与线形调整关键技术与施工工艺。

关键词：悬索桥钢箱梁西堠门大桥北边跨锚侧安装与线形调整关键技术

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Experimental monitoring of the strengthening construction of a segmental box girder bridge and field

Ali Fadhil NASER, Zonglin WANG

《结构与土木工程前沿（英文）》 2012年第6卷第3期页码 308-320 doi: 10.1007/s11709-012-0140-3

摘要： Prestressed concrete segmental box girder bridges are composed of short concrete segments that are either precast or cast in situ and then joined together by longitudinally post-tensioning internal, external, or mixed tendons. The objectives of this study are to monitor the construction process of the external prestressing tendons to strengthen the bridge structure and perform a field load test to measure the strain and the deflection of the anchorage devices of the external prestressing tendons to determine the state of these devices after tension forces are applied. The monitoring process of the external prestressing tendons construction includes inspecting the cracks in the diaphragm anchorage and the deviation block devices before the tension forces are applied to the external tendons; measuring the deformation of the steel deviation cross beam during the tension process; measuring the deformation of the box girder after different levels of tension forces are applied; measuring the elongation of the external tendons in each level of the tension; and measuring the natural frequency of the external tendons after the tension process is complete. The results of the monitoring process show that the measured values of the deformation, the elongation, and the natural frequency meet the requirements. Therefore, there is no damage during the construction and the tensioning of the external prestressing tendons. A field load test is performed to the anchorage beam, the steel deviation block devices, and the steel deviation cross beam. The field load test results of the anchorage devices show that the values of the strains, the stresses, and the deflection are less than the respective allowable limit values in the requirements. Therefore, the anchorage devices have sufficient strength, and the working state is good after the tension forces are applied to the external prestressing tendons.

关键词： prestressed concrete box girder monitoring external tendons strain deflection

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泰州大桥钢箱梁除湿研究

李林,许郡

《中国工程科学》 2012年第14卷第5期页码 10-13

摘要：

泰州大桥主桥钢箱梁长2 160 m，体积约24万m³，采用转轮式除湿系统。阐述了泰州大桥钢箱梁除湿的原理、选型及布置、工作流程、施工等，并拟定了泰州大桥钢箱梁除湿的检验评定标准，为同类工程提供了借鉴。

关键词：泰州大桥钢箱梁除湿研究

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Fatigue stress monitoring and analyses for steel box girder of Runyang Suspension Bridge

WANG Ying, LI Zhaoxia, WU Baijian

《结构与土木工程前沿（英文）》 2008年第2卷第3期页码 197-204 doi: 10.1007/s11709-008-0038-2

摘要： The monitoring of fatigue stress of steel bridge is a key issue of bridge health monitoring and safety assessment. This paper aims to find out the strain history features of the girder components of Runyang Suspension Bridge (RYSB) under vehicle and environmental loading during its first year of service based on the strain-history data recorded by structural health monitoring system installed in the bridge. The fatigue stress spectrums of steel box girders under normal traffic load, heavy trucks and typhoon loads were studied as well as the correlation between varying strain and temperature based on real-time monitoring of temperature histories. The results show that, monitoring on local strain in health monitoring systems of RYSB can effectively provide the information on fatigue stresses. The range of the equivalent fatigue stress on the monitoring location of the bridge is currently low, mainly due to varying traffic loading and temperature. There exists significant correlation between varying temperature and mean value of fatigue stress. Effect of the passing of heavy trucks on bridge fatigue is quite significant since the value of the cumulative fatigue damage generated by heavy trucks is 10 to 100 times larger than that by normal traffic. Therefore, the effect on fatigue cumulative damage due to heavy trucks or overloaded vehicles needs to be monitored and paid much attention to.

关键词： bridge monitoring location RYSB traffic loading information

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Evaluation of the static and dynamic structural performance of segmental pre-stressed concrete box girderbridge after repairing and strengthening

Ali Fadhil NASER, Zonglin WANG

《结构与土木工程前沿（英文）》 2013年第7卷第2期页码 164-177 doi: 10.1007/s11709-013-0196-8

摘要： The objectives of this study are to explain the repairing and strengthening methods which are used to improve the structural performance of the bridge structure, to analyze the static and dynamic responses after strengthening, and to evaluate the performance of the bridge structure after repairing and strengthening. The methods of repairing and strengthening include reconstruction the deck of the bridge by casting 10 cm layer of concrete, strengthening the web and bottom floor of box girders of middle spans and side spans by sticking the steel plates, strengthening the whole bridge structure by using external pre-stressing tendons, and treatment the cracks. The results of theoretical analysis show that the values of tensile stress and vertical deflection are decreased and the compressive stress is increased after strengthening. There are not tensile stresses are appeared in the sections of the bridge structure. The modal analysis results show that the value of natural frequency is equal to 2.09 Hz which is more than the values before strengthening which is equal to 1.64 Hz, indicating that the stiffness of the bridge structure is improved and the strengthening process is effective to improve the cracks resistance and bearing capacity of the bridge structure.

关键词： structural performance steel plates external pre-stressing cracks grouting method static

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泰州大桥悬索主桥钢箱梁吊装施工顺序的确定

王峻,梁进达

《中国工程科学》 2012年第14卷第5期页码 41-45

摘要：

泰州大桥是世界上首座超千米的三塔两跨悬索桥，主跨为2×1 080 m，中塔采用纵向“人”字形、横向门式框架型钢塔，边塔采用门式框架型混凝土塔，加劲梁为扁平流线型钢箱梁结构，全桥共136片钢箱梁，总重约33 426 t。通过分析钢箱梁吊装顺序对结构体系和施工难度的影响，确定了三塔悬索桥合适的钢箱梁吊装顺序。

关键词：三塔两跨悬索桥钢箱梁吊装顺序

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大跨度三跨连续悬索桥钢箱梁总体吊装方案研究

姚清涛,潘桂林,游新鹏,何超然

《中国工程科学》 2013年第15卷第8期页码 54-59

摘要：

三跨连续悬索桥不同于单跨悬索桥，两边跨设置吊杆，在主塔区域设置无吊索梁段实现中边跨加劲梁之间的连续过渡，并且一般在边跨过渡墩处设置限位转置，实现该区域主缆和加劲梁的协调变形，是其主要结构特点；因此该类型悬索桥加劲梁的吊装方法及关键施工工序也相对较为复杂。以南京长江第四大桥为工程背景，针对大跨度三跨连续悬索桥的结构特点，通过对两种不同的钢箱梁吊装顺序进行比选分析，确定合理的钢箱梁吊装方案。

关键词：三跨连续悬索桥钢箱梁吊装方案合龙鞍座顶推

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连续钢箱梁桥面铺装层结构应力分析

李国芬,曹牧,王宏畅,朱华平

《中国工程科学》 2013年第15卷第8期页码 79-83

摘要：

正交异性钢桥面的构造复杂，用理论算法对铺装层进行力学计算，较难得到精确的计算结果。本文利用有限元通用软件对曲线钢箱梁桥浇筑式沥青铺装层进行受力分析，将正交异性钢桥面板、铺装层作为整体，建立有限元模型，研究铺装层受力变形特点。根据钢桥面铺装层常出现的病害，并结合超载及刹车产生的水平荷载对铺装层受力的影响，提出相应的桥面铺装层破坏的综合控制指标。

关键词：桥面铺装曲线钢箱梁铺装层开裂粘结滑移应力应变特性

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Temperature variation of concrete box girder bridge

Jian WANG, Zhi FANG,

《结构与土木工程前沿（英文）》 2009年第3卷第4期页码 407-413 doi: 10.1007/s11709-009-0053-y

摘要： On the basis of theoretical analysis and measurement on site, the temperature gradients and its variation on concrete box girder bridges resulting from ambient temperature, solar radiation, and structural temperature fields were discussed. With the help of the heat transfer theory and finite element method (FEM), the heat flux of the surface of concrete box girder was carried out, and all the heat fluxes were described as the convection. The results were compared with that from field measurements, and a good correlation was found. It was revealed that the methods, the parameters, the boundary condition used in this paper were reasonable. Last, some conclusions were obtained, which could provide the basis for box girder design under solar radiation.

关键词： temperature transfer correlation radiation variation

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Mechanics analysis of thin-walled box continuous girder with variable cross-sections in considering effect

Yuji CHEN, Qizhi LUO,

《结构与土木工程前沿（英文）》 2009年第3卷第4期页码 352-356 doi: 10.1007/s11709-009-0057-7

摘要： In order to study the mechanics behavior of a thin-walled box continuous girder with variable cross-sections, using potential variation theories, considering the effect of shear lag of flange’s stress and the nonlinear geometry of vertical displacement, and evolving five generalized displacements with the spline function, the large deflection problem of the thin-walled box continuous girder with variable cross-section was transformed to a nonlinear algebraic equation, which was solved using the Newton-Raphon iterative method. The results of the calculation show that different shear lag warp functions to the cantilever, top and bottom plate should be taken to analyze the mechanics behavior of the thin-walled box continuous girder reliably. The thin-walled box continuous girder with variable cross-sections has more reasonable stress state and is more adaptable for the longitudinal change of internal forces than that with equal cross-sections. The effect of large deflection on the stress and displacement of the thin-walled box continuous girder with variable cross-sections depends on the values of the load.

关键词： thin-walled box girder with variable cross-sections potential variational theory shear lag large deflection problem

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Seismic performance of fabricated continuous girder bridge with grouting sleeve-prestressed tendon composite

《结构与土木工程前沿（英文）》页码 827-854 doi: 10.1007/s11709-023-0954-1

摘要： The seismic performance of a fully fabricated bridge is a key factor limiting its application. In this study, a fiber element model of a fabricated concrete pier with grouting sleeve-prestressed tendon composite connections was built and verified. A numerical analysis of three types of continuous girder bridges was conducted with different piers: a cast-in-place reinforced concrete pier, a grouting sleeve-fabricated pier, and a grouting sleeve-prestressed tendon composite fabricated pier. Furthermore, the seismic performance of the composite fabricated pier was investigated. The results show that the OpenSees fiber element model can successfully simulate the hysteresis behavior and failure mode of the grouted sleeve-fabricated pier. Under traditional non-near-fault ground motions, the pier top displacements of the grouting sleeve-fabricated pier and the composite fabricated pier were less than those of the cast-in-place reinforced concrete pier. The composite fabricated pier had a good self-centering capability. In addition, the plastic hinge zones of the grouting sleeve-fabricated pier and the composite fabricated pier shifted to the joint seam and upper edge of the grouting sleeve, respectively. The composite fabricated pier with optimal design parameters has good seismic performance and can be applied in high-intensity seismic areas; however, the influence of pile-soil interaction on its seismic performance should not be ignored.

关键词： seismic performance continuous girder bridge grouting sleeve-prestressed tendon composite connections grouted sleeve connection design parameters

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Precast steel–UHPC lightweight composite bridge for accelerated bridge construction

Shuwen DENG, Xudong SHAO, Xudong ZHAO, Yang WANG, Yan WANG

《结构与土木工程前沿（英文）》 2021年第15卷第2期页码 364-377 doi: 10.1007/s11709-021-0702-3

摘要： In this study, a fully precast steel–ultrahigh performance concrete (UHPC) lightweight composite bridge (LWCB) was proposed based on Mapu Bridge, aiming at accelerating construction in bridge engineering. Cast-in-place joints are generally the controlling factor of segmental structures. Therefore, an innovative girder-to-girder joint that is suitable for LWCB was developed. A specimen consisting of two prefabricated steel–UHPC composite girder parts and one post-cast joint part was fabricated to determine if the joint can effectively transfer load between girders. The flexural behavior of the specimen under a negative bending moment was explored. Finite element analyses of Mapu Bridge showed that the nominal stress of critical sections could meet the required stress, indicating that the design is reasonable. The fatigue performance of the UHPC deck was assessed based on past research, and results revealed that the fatigue performance could meet the design requirements. Based on the test results, a crack width prediction method for the joint interface, a simplified calculation method for the design moment, and a deflection calculation method for the steel–UHPC composite girder in consideration of the UHPC tensile stiffness effect were presented. Good agreements were achieved between the predicted values and test results.

关键词： accelerated bridge construction ultrahigh-performance concrete steel–UHPC composite bridge UHPC girder-to-girder joint

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Pretest analysis of shake table response of a two-span steel girder bridge incorporating acceleratedbridge construction connections

Elmira SHOUSHTARI, M. Saiid SAIIDI, Ahmad ITANI, Mohamed A. MOUSTAFA

《结构与土木工程前沿（英文）》 2020年第14卷第1期页码 169-184 doi: 10.1007/s11709-019-0590-y

摘要： This paper presents pretest analysis of a shake table test model of a 0.35-scale, two-span, steel plate girder bridge. The objective of pretest analysis was to obtain an insight on the seismic response of the bridge model during the shake table tests. The bridge included seat type abutments, full-depth precast deck panels, and a two-column bent in which columns were pinned to the footing and integral with superstructure. Six accelerated bridge construction connections were incorporated in the bridge model. An analytical model was developed in OpenSees and was subjected to ten input bi-directional earthquake motions including near-fault and far-field records. The overall seismic response of the bridge was satisfactory for all the earthquake records at 100%, 150%, and 200% design level. All connections and capacity-protected components remained elastic, and the average ductility capacity surpassed the ductility demand even at 200% design level. Using experimental fragility curves developed for RC bridge columns, it was predicted that there was a probability of 45% that columns would undergo the imminent failure in the last run and a probability of 30% for their failure.

关键词： shake table test accelerated bridge construction steel girder bridge OpenSEES UHPC simple for dead continuous for live