vertical lift bridge model
This is a non operating model. doi: 10.1061/(ASCE)0733-9445(1998)124:7(817), Aygül, M., Bokesjö, M., Heshmati, M., and Al-Emrani, M. (2013). Structural model updating using dynamic data. If the bridge experiences a vessel collision causing a significant reduction in the overall capacity of the target members as modeled in this work, ≥90% of the member capacity, deliberate actions should be taken immediately to reduce demand or replace the damaged members. HO Scale stationary kit features laser cut acrylic parts, tab and slot construction and detailed instructions. The structural response data in Table 1 illustrates that the detailed multi-scale model produces lower strain responses indicating a stiffer connection, as expected with more beam elements, when compared to the multi-scale and shell element models. The redundancy of the structural system allows for load redistribution to surrounding health members. 10, 441–445. Truck load testing, (A) load distribution to each wheel, (B) stop locations on northbound and southbound, and (C) strain time-history of the instrumented diagonal. The central government is working at full throttle to complete the construction of India’s first vertical lift railway sea bridge in Rameswaram, ... Our business model is you and your subscription. Struct. Similar beam and shell elements as those used in aforementioned models were applied in this model. These were built In general, the wavelet-based decision-making methodology consists of different steps sequentially come after each other. The proposed protocol was developed to demonstrate how the use of sensor technology and structural modeling combined with enhanced methodologies and engineering practices can yield reliable bridge condition assessment and proactive visual inspection and subsequent load rating evaluation on demand basis. The representing analytical responses belong to the horizontal strain gauges (Ex) for the bottom connection under the truck load corresponding to the second stop during the load test. By definition, the wavelet packet function is expressed by: where i, j, and k denote the modulation, scale, and translation parameters, respectively. A vertical-lift bridge or just lift bridge is a type of movable bridge in which a span rises vertically while remaining parallel with the deck. (2018a) was employed to discriminate between two different states of the structure using the collected acceleration data obtained from the SAP2000® model at pseudo-sensor (accelerometer) locations throughout the bridge model. 1051–1066. Nevertheless, fatigue life prediction of bridges has been accomplished by a number of researchers through field measurements and experimental testing. The editor and reviewers' affiliations are the latest provided on their Loop research profiles and may not reflect their situation at the time of review. doi: 10.1061/(ASCE)0733-9445(2002)128:10(1354), Vafaei, M., Alih, S. C., Shad, H., Falah, A., and Halim, N. H. F. A. Eng. The new Memorial Bridge includes an innovative “gusset-less” truss connection and a metalized corrosion protective coating (see Figure 1). The beam elements are three-dimensional thick beam elements that have 6-nodal DOFs. The concentrated strain areas indicate that the interface point location must be located as a greater distance from the web of the gusset-less connection. With the higher recorded cycles of stress ranges (considerable for fatigue assessment), the difference between the nominal and hot-spot fatigue responses can be infinite and finite reports of the remaining life of the component. Shock Vibrat. Bridging the Gap-restoring and Rebuilding the Nation's Bridges. Structural Response Monitoring of a Vertical Lift Truss Bridge. The SCF factors for the complex components which are not documented on the codes, can be measured through a validated FE model by dividing the hot-spot stress, σhot, by the nominal stress, σnom, expressed in Equation (5): To determine the appropriate SCF, the numerical strain response at the toe of the weld and the nominal strain response at the location of the strain rosette are applied. The following sections demonstrate the application of the proposed diagnostic load testing for two different approaches, including the static model calibration of the FE models developed in Lusas® and structural system identification of the numerical model in SAP2000®. Struct. In order to make an efficient and cost-effective plan for structural health monitoring, several components must be considered. The Mandapam-Pamban-Rameswaram railway link. The numerical results obtained from the FE models were used to be compared to the equivalent field strain response during the load test. Ni, Y. Q., Ye, X. W., and Ko, J. M. (2010). This protocol could be functional via the monitoring data collected through a long term SHM system to predict the bridge structural behavior in the presence of damage. A. F. O., Carvalho, H., Vilela, P., De Jesus, A. M. P., et al. With a total number of twelve accelerometers deployed on the Portsmouth-side span and lift tower of the bridge, the accelerometers have been capturing the bridge dynamic acceleration response continuously. The deck between the towers lifts up to allow boats under. Mohammadi, J., Guralnick, S. A., and Polepeddi, R. (1998). Instrumentation, nondestructive testing, and finite-element model updating for bridge evaluation using strain measurements. The use of thick shell elements also provides stress results throughout the thickness of the element. Virtual Bridge Co. (2018). In this case study, the strain time-history response of the strain rosettes recorded during the quasi-static load test provides sufficient information for static model calibration of the multi-scale models in Lusas®. Olaszek, P., Łagoda, M., and Casas, J. R. (2014). The instrumentation plan for the long term monitoring program of the Memorial Bridge. In the multi-scale model, it was found that the local stiffness of the gusset-less connection and the induced strain response can be conveniently refined through a minor change in the interface point location. 843:012038. doi: 10.1088/1742-6596/843/1/012038, Laman, J. Shahsavari, V., Chouinard, L., and Bastien, J. Digest. The entire bridge is Appl. Keywords: structural health monitoring, load testing, structural model calibration, vertical lift bridge, structural condition assessment. A long term SHM program is developed based on a short term monitoring program to design an efficient and cost-effective layout for collection of data at locations where the bridge components are highly susceptible to fatigue, impact damage and excessive dynamic movements. Pract. Shahsavari, V., Mehrkash, M., and Santini-Bell, E. (2018a). No. In applying the S-N curve for the fatigue damage measurement, the novel gusset-less connection is not categorized among the recognized components existing in American Association of State and Highway Transportation Officials (AASHTO) fatigue categories. The authors performed statistical investigations on the results of finite element analyses obtained from solid element based finite element models for welded bridge details and the fatigue test data collected from the literature. Recommendations for IIW subcommision XV-E. International Institute of Welding. This paper will detail the development of the instrumentation layout to support a long term structural health monitoring program with short term applications. Swarajya - a big tent for liberal right of centre discourse that reaches out, engages and caters to the new India. 7, 79–98. This paper presents a case study to better prioritize the management strategies for smart and in-service bridges instrumented by structural health monitoring sensors. doi: 10.1061/(ASCE)0733-9445(1999)125:9(1048), Sanayei, M., Phelps, J. E., Sipple, J. D., Santini-Bell, E., and Brenner, B. R. (2011). If the damage intensity is simulated by reduction of property modifiers of the damaged members in the analytical model and the capacity of the damaged member is diminished by corresponding reduction factors, the degradation of load rating of the bridge can be obtained. Struct. This model was developed for simulating the lifting action of the bridge. The wavelet packet component fji(t) is given by: where cj,ki(t) is the wavelet coefficient at time instant (t). This paper also presents the application of a wavelet-based method based on the real-time data collected from the SHM sensors to quantify the change in the bridge system response in the presence of likely damage scenarios. 16 Kashefi et al. In addition, the interface points surrounding the higher scale element determine the local stiffness of the component which is required to be positioned in optimum locations to provide a harmonic balance for the components. The counterweights on a vertical lift bridge only have to be equal to the weight of the bridge, whereas on a bascule bridge counterweights must weigh several times more than the span being lifted. A comparative study of different fatigue failure assessments of welded bridge details. 639, eds X. Zhou, G. He, Y. Load testing is a common practice among bridge engineers for the assessment of bridge safety and serviceability. Checkout the help docs for more information. Struct. doi: 10.1016/j.engstruct.2016.11.056.


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