Hutt River pipeline bridge spanning across the Wellington fault

2021 ◽  
Author(s):  
Francisco Barrantes ◽  
Andrew McMenamin ◽  
Roger Tang
Keyword(s):  
Water Supply ◽  
Seismic Load ◽  
Seismic Loads ◽  
Bridge Structure ◽  
Fault Rupture ◽  
Seismic Effects ◽  
Arch Bridge ◽  
Geological Fault ◽  
Factors Influencing ◽  
Pipeline Crossing

<p>This project originates from the need to provide seismic resilient solution for water supply to Wellington and Porirua. With other factors influencing the design, the pipeline crossing must withstand seismic loads including the rupture event of the Wellington Fault with movement of +/-6.5 m parallel to the river stream</p><p>The option study for the pipeline crossing concluded on using a bridge structure spanning the river and the geological Fault. This network arch bridge structure selected is provided with enough movement capacity to withstand the effects of the fault rupture movement without failure.</p><p>The length of the bridge structure is defined so to match the differential rotations between the supports to the allowable limits for the pipeline flex joints. To resist these seismic effects, the structure is provided with seismic restrainers that, at the same time as supporting the seismic load, provide enough rotation capability to accommodate movements on the foundations due to the Fault’s ruptureevent.</p>

Weak-Link Analysis of Motor-Operated Butterfly Valve

2002 ◽  
Author(s):  
Donghae Kim
Keyword(s):  
Structural Integrity ◽  
Weak Link ◽  
Link Analysis ◽  
Seismic Load ◽  
Seismic Loads ◽  
Static Force ◽  
Bending Stress ◽  
Butterfly Valve ◽  
Load Path ◽  
Valve Assembly

The purpose of this paper is to address the structural integrity of the motor operated butterfly valve assembly by providing the methodology and equations to quantitatively determine the permissible component load in the load path from the operator to the valve. The weak link analysis is to determine the maximum allowable torque on the butterfly valve by equating the stresses caused by the torque and seismic load with the appropriate allowable stress value, and then the unknown torque is solved. Analysis methods are based on classical static force balancing equations and on classical axial, shear, and bending stress equations using the worst possible load combinations including seismic loads resulting from design basis earthquake.

Character Analysis of Balance and Imbalance of Varying Rigidity of Rigid Pile Composite Foundation under Seismic Load

2014 ◽  
Vol 1065-1069 ◽  
pp. 19-22
Author(s):  
Zhen Feng Wang ◽  
Ke Sheng Ma
Keyword(s):  
Finite Element ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Element Model ◽  
Composite Foundation ◽  
Seismic Load ◽  
Seismic Loads ◽  
Element Analysis ◽  
Rigid Pile ◽  
Rigid Pile Composite Foundation

Based on ABAQUS finite element analysis software simulation, the finite element model for dynamic analysis of rigid pile composite foundation and superstructure interaction system is established, which selects the two kinds of models, by simulating the soil dynamic constitutive model, selecting appropriate artificial boundary.The influence of rigid pile composite foundation on balance and imbalance of varying rigidity is analyzed under seismic loads. The result shows that the maximum bending moment and the horizontal displacement of the long pile is much greater than that of the short pile under seismic loads, the long pile of bending moment is larger in the position of stiffness change. By constrast, under the same economic condition, the aseismic performance of of rigid pile composite foundation on balance of varying rigidity is better than that of rigid pile composite foundation on imbalance of varying rigidity.

Experimental Research on Special-Shaped CFST Arch Bridge Model

2011 ◽  
Vol 243-249 ◽  
pp. 1835-1841
Author(s):  
Da Peng Gu ◽  
Yan Jiang Chen ◽  
Wei Ming Yan ◽  
Yong Li
Keyword(s):  
Experimental Research ◽  
Model Test ◽  
Static Model ◽  
Bridge Engineering ◽  
Bridge Structure ◽  
Arch Bridge ◽  
Bridge Model ◽  
Cfst Arch Bridge ◽  
National Road ◽  
Main Bridge

The main bridge structure of the bridge engineering cross Yitong river, on the 102 national road, is a three-Span flying swallow type special-shaped CSFT arch bridge. This paper introduces the design, process and results of the static model test of the CFST arch bridge.

Detection and Evaluation of Ling Bridge in Ningbo

2015 ◽  
Vol 744-746 ◽  
pp. 850-854
Author(s):  
Bo Shan Zhang ◽  
Jun Xu
Keyword(s):  
Visual Inspection ◽  
Status Quo ◽  
Structural Deformation ◽  
Normal Operation ◽  
Bridge Structure ◽  
Arch Bridge ◽  
Trunk Road ◽  
The Status ◽  
Status Assessment

Ling Bridge in Ningbo, a province-protected historic relic in Zhejiang, is the only three-hinged steel arch bridge existing in China as well as the first modern steel arch bridge co-constructed by Chinese engineers and foreign engineers in 1936. For over 70 years the bridge has served as an important transportation node on urban trunk road, bearing significant traffic pressure. It is necessary to have its status quo detected and its safe use evaluated to sustain normal operation of the bridge. The status assessment of the bridge is conducted in the following aspects: first, visual inspection was applied to check types of existing diseases and to estimate their threat degrees to the bridge; then, spatial linear examination was applied to detect structural deformation and to calculate whether there exists a instability hazard; finally, strength and fatigue calculation was made to determine safety degree of the bridge structure.

Practical Calculation of Cable-Stayed Arch Bridge Lateral Stability

2014 ◽  
Vol 587-589 ◽  
pp. 1586-1592 ◽  
Author(s):  
Wei Lu ◽  
Ding Zhou ◽  
Zhi Chen
Keyword(s):  
Calculation Method ◽  
Practical Calculation ◽  
Lateral Stability ◽  
Bridge Structure ◽  
Construction Process ◽  
Energy Principle ◽  
Arch Bridge ◽  
Long Span ◽  
Arch Bridges ◽  
Cable Stayed Bridges

A long-span cable-stayed arch bridge is a new form of bridge structure that combines features of cable-stayed bridges with characteristics of arch bridges. In the present study, we derived a practical calculation method for the lateral destabilization critical loading of cable-stayed arch bridges during the construction process based the energy principle. The validity of the method was verified with an example. The calculation method provides a quick and efficient way to evaluate the lateral stability of a cable-stayed arch bridge and a concrete filled steel tubular arch bridge during the construction process.

Calculation Analysis of Strengthening Arch Bridge Structure Based on Release Energy Method

2011 ◽  
Vol 71-78 ◽  
pp. 1732-1735
Author(s):  
Qing Ping Jin ◽  
Xian Bao Wang ◽  
Xue Jun Li
Keyword(s):  
Energy Method ◽  
Carrying Capacity ◽  
Safety Margin ◽  
Bridge Structure ◽  
Masonry Arch ◽  
Arch Bridge ◽  
Before And After ◽  
Arch Bridges ◽  
Calculation Analysis ◽  
Masonry Arch Bridge

The arch bridges were used widely for the good performance under the pressure in China. It was very sensitive to some factors as temperature , settlement etc so that the arch bridges occurred the disease, carrying capacity reduction or even structure destruction etc.In the paper, based on the characteristics of masonry arch bridges, reinforcement method was analyzed, according to the situation of a masonry arch bridge, release energy method was applied to strengthening project. By comparing the stress and the strain before and after the strengthening project, some conclusions could be drawn that the bridge structure carrying capacity had been raised, the energy accumulated in the bridge structure was released, the structure safety margin was improved.

scholarly journals Seismic design of prestressed concrete buildings

1990 ◽  
Vol 23 (4) ◽  
pp. 288-304 ◽  
Author(s):  
Minehiro Nishiyama
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Dynamic Response ◽  
Seismic Design ◽  
Prestressed Concrete ◽  
Design Procedure ◽  
Seismic Load ◽  
Seismic Loads ◽  
Concrete Buildings ◽  
Reversed Cyclic

The current seismic design procedure for prestressed concrete buildings in Japan is described. The design seismic loads for prestressed concrete buildings provided in NZS 4203:1984 are compared with those in the corresponding Japanese code. Comparisons between prestressed concrete and ordinary reinforced concrete buildings are discussed with regard to design seismic load, dynamic response during earthquake motions and the performance of beam-column joints under reversed cyclic loading. The results of several tests are summarised.

scholarly journals CALCULATIONS OF SHORT PIPELINES TAKING INTO ACCOUNT THE FLOW STABILIZATION

2021 ◽  
pp. 13-17
Author(s):  
Olena Gizha
Keyword(s):  
Water Supply ◽  
Mutual Influence ◽  
Usual Method ◽  
Water Supply Systems ◽  
Local Resistance ◽  
Pressure Losses ◽  
Economic Decisions ◽  
Factors Influencing ◽  
Flow Stabilization ◽  
Supply Systems

Analyzing the existing dependences on the calculation of short pressure pipelines in turbulent mode, significant shortcomings of these recommendations were identified. A physical model of motion is proposed, which explains the processes occurring in the area of stabilization after local resistance and allows to establish the factors influencing its length.Experiments on pipes with different roughness and different pipeline fittings made it possible to analyze the change in kinematic characteristics in the area after resistance. Studies have shown that in short pipes, the length of which is less than the length of the stabilization section, there are less pressure losses than in the calculations by the usual method, when there are simply local and length losses. Dependencies and graphs are given that take into account the mutual influence of local resistances in the case of their location at a distance less than the stabilization area. The proposed recommendations make it possible to make more informed economic decisions when designing short pressure pipelines of various water supply systems.

scholarly journals Evaluation of notional loads magnitude to three calibration concentric braced frames subjected to seismic loads in Indonesia

2019 ◽  
Vol 276 ◽  
pp. 01005
Author(s):  
Heru Purnomo ◽  
Mulia Orientilize ◽  
Sjahril A Rahim ◽  
Firdaus A Zaki
Keyword(s):  
Numerical Study ◽  
Direct Analysis ◽  
Second Order ◽  
Effective Length ◽  
Seismic Load ◽  
Seismic Loads ◽  
Elastic Analysis ◽  
Braced Frames ◽  
Braced Frame ◽  
Geometric Imperfection

The changing of SNI 03-1729 from 2002 to 2015 which refer to AISC 2010 change the method of steel stability analysis from effective length method (ELM) to direct analysis method (DAM). DAM use second order elastic analysis, accommodate strength reduction, geometric imperfection presented as notional load, and take buckling factor (K) equal to 1. Numerical study has been conducted to find out the appropriate magnitude of notional loads on concentric braced frame subjected to seismic load in Indonesia. Experimental results from three different calibration frames from previous research were used as reference. The frames consisted of 1-story, 3-stories, and 5-stories were reanalyzed by using SAP software with four different methods: ELM first order elastic analysis, ELM second order elastic analysis, and DAM with different notional loads coefficient as 0.002 and 0.003. Seismic loads according SNI 1726:2012 in three seismic regions were considered.

scholarly journals Stability of Reinforced Retaining Wall under Seismic Loads

2019 ◽  
Vol 9 (11) ◽  
pp. 2175 ◽  
Author(s):  
Liang Jia ◽  
Shikai He ◽  
Na Li ◽  
Wei Wang ◽  
Kai Yao
Keyword(s):  
Slip Surface ◽  
Retaining Wall ◽  
Tensile Force ◽  
Friction Angle ◽  
Unit Weight ◽  
Seismic Load ◽  
Seismic Loads ◽  
The Stability ◽  
Slice Method ◽  
Reinforced Retaining Wall

Based on the horizontal slice method (HSM) and assuming a log spiral slip surface, a method to analyze the stability of a reinforced retaining wall under seismic loads was established in this study by calculating the tensile force of the reinforcement. A parametric study was conducted on the normalized tensile force of the reinforcement, and it was observed that the normalized tensile force tends to increase with acceleration of the seismic load and the height of the backfill. Moreover, it also increases with soil unit weight, while it decreases with increased friction angle of the backfill soil, and the influence of soil cohesion on the normalized tensile force is not significant. The HSM method is proved to be suitable for analyzing the tensile force of reinforcement in retaining walls under seismic loads.

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