scholarly journals Seismic Strengthening of Existing RC Buildings With External Cross-Laminated Timber (CLT) Walls Hosting an Integrated Energetic and Architectural Renovation

2021 ◽  
Author(s):  
Lorenzo Badini ◽  
Ing. Patrik Aondio ◽  
Stephan Ott ◽  
Stefan Winter
Keyword(s):  
Finite Element ◽  
Response Spectrum ◽  
Target Displacement ◽  
Structural Elements ◽  
Existing Buildings ◽  
Rc Buildings ◽  
Cross Laminated Timber ◽  
Finite Element Software ◽  
Rc Frames ◽  
Assembly Procedure

Abstract In this study a timber-based integrated solution is presented to solve at once common issues affecting typical reinforced concrete (RC) existing buildings, such as seismic and energy performances, providing an eco-friendly alternative to steel external bracing systems. Cross-laminated timber (CLT) walls are provided perpendicularly to the external façades as strengthening elements while interposed CLT slabs are foreseen at each floor level to host new architectural units together with a new envelope. While the connections to the foundations and to the existing RC frames are provided respectively with steel brackets and axial-connectors distributed along the height of the building, a post-tensioned connection, between CLT panels (PT-CLT connection), is implemented in the system to guarantee resistance to horizontal actions acting parallel to existing façades with consequent structural independence and architectural freedom. A numerical model is developed with finite element software characterizing each type of connector for linear and non-linear analyses. Modal analyses with response spectrum are performed to verify structural elements and connectors, while pushover analyses with target displacement checks are performed to assess the obtained seismic improvement. Finally, the preassembled architectural components that allow to renovate the envelope and the provided assembly procedure are revealed.

Effect of Pile-Soil-Structure Interaction on the Cable-Stayed Bridge in Response to the Earthquake

2014 ◽  
Vol 539 ◽  
pp. 731-735 ◽  
Author(s):  
Yu Chen
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Soil Structure ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Three Dimensional Finite Element

In this thesis, based on the design of a 140+90m span unusual single tower and single cable plane cable-stayed bridge, free vibration characteristics and seismic response are investigated; three dimensional finite element models of a single tower cable-stayed bridge with and without the pile-soil-structure interaction are established respectively by utilizing finite element software MIDAS/CIVIL, seismic response of Response spectrum and Earthquake schedule are analyzed respectively and compared. By the comparison of the data analysis, for small stiffness span cable-stayed bridge, the pile-soil-structure interaction can not be ignored with calculation and analysis of seismic response.

scholarly journals Case Study and Numerical Simulation of Excavation beneath Existing Buildings

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Hua-feng Shan ◽  
Shao-heng He ◽  
Yu-hua Lu ◽  
Wei-jian Jiang
Keyword(s):  
Finite Element ◽  
Case Reports ◽  
Measurement Data ◽  
Element Model ◽  
Existing Buildings ◽  
Related Case ◽  
Finite Element Software ◽  
Curing Period ◽  
Cutting Sequences ◽  
Bearing Behavior

Excavation beneath existing buildings may cause the superstructure to tilt and crack, which seriously affects the normal use of the superstructure. Due to the new working conditions of excavation beneath existing buildings, related case reports are rare and limited. In the case of No. 3 section basement construction project of Ganshuixiang, we monitored the excavation construction by burying test instruments at the designated location. Afterwards, Plaxis 3D finite element software was used to establish an underpinning pile-cap-excavation model, which can analyze the influence of different pile cutting sequences on the bearing behavior of new basement structural pillars. By comparing the in situ measurement data with the finite element model, it can be concluded that when the excavation depth rises, the axial force of the underpinning pile gradually increases, and the pile skin friction is slowly exerted from top to bottom. Different cutting sequences will influence the bearing behavior of the structural pillar. Moreover, the pile cutting process also significantly impacts its bearing behavior and the settlement behavior of the superstructure. Compared with the clockwise pile cutting sequence, the symmetrical pile cutting is more advantageous. In the whole process of the storey adding and reconstruction, the superstructure settlement is related to the working condition of digging and adding layers. In the stage from soil excavation to the concrete curing period of the structural pillar, it increases slowly with time and tends to be stable in the concrete curing period. However, in the pile cutting stage, the superstructure settlement increases sharply, and after pile cutting, it becomes stable.

Interaction Analysis of Foundation Pit Excavation and Adjacent Existing Building's Pile Foundation

2014 ◽  
Vol 501-504 ◽  
pp. 286-290
Author(s):  
Shan Shan Xu ◽  
Qiu Sheng Gao
Keyword(s):  
Finite Element ◽  
Pile Foundation ◽  
Interaction Analysis ◽  
Vertical Displacement ◽  
Measured Data ◽  
Construction Site ◽  
Existing Buildings ◽  
Foundation Pit ◽  
Finite Element Software ◽  
Site Monitoring

Construction site-monitoring on adjacent existing building’s pile foundation,using ANSYS finite element software to simulate the deformation of adjacent pile foundation when foundation pit excavation. Combined with measured data to analyze the interaction of foundation pit excavation and adjacent existing building’s pile foundation and draw the conclusion that the measured settleme-nt of pit’s adjacent pile is greater than the model’s theoretical value and the pit excavation has certain influence on the pile foun-dation’s vertical displacement of existing buildings.

scholarly journals Structural design and mechanical properties analysis of bamboo-wood cross-laminated timber

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5417-5432
Author(s):  
Chao Li ◽  
Xilong Wang ◽  
Yizhuo Zhang
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Load ◽  
Cross Laminated Timber ◽  
Finite Element Software ◽  
Error Coefficient ◽  
Final Stress ◽  
The Difference ◽  
Total Curve

To explore the overall mechanical properties of bamboo-wood composite cross-laminated timber (BCLT), a simulation model of BCLT mechanical behavior based on the solid element was established using the finite element software ABAQUS. The actual four-point bending experiment was compared and analyzed with the finite element numerical simulation. The total curve error coefficient of the BCLT specimen at 18-mm displacement was 0.2988 while the interval was 0.5 mm. The error coefficient was 0.0178 when the maximum load was reached, and the minimum error coefficient was 0.0015 at 12 mm of displacement. Analysis of the influence of material parameters, meshing density, and material arrangement on the final stress distribution indicate that the difference in the elastic parameters of the material greatly influence the final stress distribution, and the arrangement and combination of materials also have an effect on the overall mechanical properties of the BCLT board. The combination CLT1-2-1 (i.e., the upper and lower layers of the bamboo are Arrangement 1 and the hemlock is Arrangement 2) have a maximum load of 57682 Ν and a maximum stress of 103.9 MPa.

Seismic safety of valuable non-structural elements in RC buildings: Floor Response Spectrum approaches

2020 ◽  
Vol 205 ◽  
pp. 110081 ◽  
Author(s):  
Luisa Berto ◽  
Marco Bovo ◽  
Irene Rocca ◽  
Anna Saetta ◽  
Marco Savoia
Keyword(s):  
Response Spectrum ◽  
Structural Elements ◽  
Rc Buildings ◽  
Seismic Safety

scholarly journals Numerical modelling of dynamic stability of RCC dam

2018 ◽  
Vol 195 ◽  
pp. 03021
Author(s):  
Omer Mughieda ◽  
Kenan Hazirbaba ◽  
Khaldoon Bani-Hani ◽  
Wassim Daoud
Keyword(s):  
Finite Element ◽  
Structural Stability ◽  
Response Spectrum ◽  
Time History ◽  
The Body ◽  
Roller Compacted Concrete ◽  
Finite Element Software ◽  
Rcc Dam ◽  
Stability Against Sliding ◽  
The Stability

Stability and stress analyses are the most important elements that require rigorous consideration in design of a dam structure. In the current research, dynamic structural stability of a roller-compacted-concrete (RCC) dam was performed. The RCC dam was modeled using the finite element method to investigate the stability against sliding and the structural stability of the body of the dam. The commercially available finite element software (SAP 2000) was used to analyze stresses in the body of the dam and foundation. A linear finite element dynamic analysis was performed. Response spectrum and time history methods were used with different earthquake loads. The response spectrum of the 1995 Aqaba earthquake and a representative elastic-spectrum with smooth plateau for both Operating Basis Earthquake (OBE) and Maximum Credible Earthquake (MCE) were used in this study. The analysis was carried out assuming that no slip will occur at the interface between the dam and the foundation. The greatest tension was found to develop in the rock adjacent to the toe of the upstream slope. The factor of safety against sliding along the entire base of the dam was found to be greater than 1 (FS>1), for both loading conditions.

Study on Seismic Safety Evaluation of RCC Gravity Dam Based on Strength

2014 ◽  
Vol 501-504 ◽  
pp. 1493-1497
Author(s):  
Shu He Wang ◽  
Ji Yuan ◽  
Rui Guo Ma ◽  
Ju Bing Zhang
Keyword(s):  
Finite Element ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Safety Evaluation ◽  
Time History ◽  
Element Model ◽  
Gravity Dam ◽  
Seismic Safety ◽  
Finite Element Software ◽  
Three Dimensional Finite Element

According to No.3 dam section of Dahuaqiao gravity dam, a three-dimensional finite element model is built by finite element software ANSYS. Mechanics of materials method, response spectrum method and time history analysis method are employed to analyze the strength of the dam section. Results show that the stress of dam toe, dam heel and downstream fold slope are relatively high and stress concentration emerges in those positions. The phenomenon indicates that these areas are vulnerable under the earthquake and precautions must be taken. But under the designed earthquake, the maximum stress of the dam section is below the allowable stress, representing the dam is in a safe state and the strength requirement is satisfied.

Nonlinear Analysis of Full-Scale Beam-Column Joints of RC Frames

2012 ◽  
Vol 446-449 ◽  
pp. 811-815
Author(s):  
Er Wei Guo ◽  
Zhen Bao Li ◽  
Hua Ma ◽  
Hong Yu Zhou ◽  
Xiu Li Du ◽  
...  
Keyword(s):  
Finite Element ◽  
Nonlinear Analysis ◽  
Full Scale ◽  
Finite Element Software ◽  
Rc Frames ◽  
Fracture Development ◽  
Load Carrying ◽  
Concrete Damage ◽  
Strain Relationship ◽  
Core Areas

In order to research on seismic performance of full-scale beam-column joints of RC frames under low cyclic loading, finite element software ABAQUS is used to nonlinear analysis. Analysis results show that: the process of load carrying and fracture development of beam-column joints are simulated using concrete damage plasticity model; nonlinear finite element method is easy to obtain stress-strain relationship; and can effective analyses the complex mechanical behavior of core areas of joints.

scholarly journals Strength optimization of structural elements by means of optimal control

2019 ◽  
Vol 262 ◽  
pp. 10006
Author(s):  
Dorota Jasinska ◽  
Leszek Mikulski
Keyword(s):  
Optimal Control ◽  
Finite Element ◽  
Differential Equations ◽  
Control Theory ◽  
Boundary Value Problem ◽  
Structural Elements ◽  
Finite Element Software ◽  
Portal Frame ◽  
Multipoint Boundary Value Problem ◽  
The Web

This paper investigates the optimal shaping of the web height of an I-section steel portal frame. The problem is formulated as a control theory task. From a mathematical perspective, the task involves solving the multipoint boundary value problem for the system of forty-three differential equations. The solution is compared to results obtained from the finite element software Abaqus.

scholarly journals Reaction Spectrum Comparative Analysis of Seismic Performance of 62 m CFST Bridge with Curved-String Truss before and after Reinforcement

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Daihai Chen ◽  
Yinxin Li ◽  
Zheng Li ◽  
Yilin Fang ◽  
Laijing Ma ◽  
...  
Keyword(s):  
Finite Element ◽  
Seismic Performance ◽  
Axial Force ◽  
Weak Link ◽  
Response Spectrum ◽  
Bending Moment ◽  
Reinforcement Scheme ◽  
Vertical Stiffness ◽  
Finite Element Software ◽  
Before And After

Taking a 62 m CFST bridge with a curved-string truss as the research object, according to its reinforcement scheme, the spatial finite element models of the bridge before and after reinforcement were established by using the general finite element software ANSYS. The natural frequencies of the bridge before and after reinforcement were calculated, and the seismic performance of the bridge was analyzed by using the response spectrum method. The results show that the frequencies of the reinforced bridges increase in varying degrees, especially the vertical and torsional frequencies. Before and after reinforcement, the maximum axial force in the upper chord of the bridge is the largest, and the shear force and bending moment are small. The maximum internal force appears at the two ends of the upper chord. This position should be regarded as the weak link of the bridge seismic resistance. Under the same conditions, the axial force of the bridge after reinforcement is reduced by about 30% compared with that before reinforcement, and the displacement of the bridge after reinforcement is reduced in varying degrees. The reinforcement measures can improve the lateral and vertical stiffness of the bridge, especially the stiffness of the deck system.

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